WebView | Android Developers
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WebView
public
class
WebView
extends AbsoluteLayout
implements
ViewTreeObserver.OnGlobalFocusChangeListener,
ViewGroup.OnHierarchyChangeListener
A View that displays web pages.
Basic usage
In most cases, we recommend using a standard web browser, like Chrome, to deliver content to the user. To learn more about web browsers, read the guide on invoking a browser with an intent.
WebView objects allow you to display web content as part of your activity layout, but lack some of the features of fully-developed browsers. A WebView is useful when you need increased control over the UI and advanced configuration options that will allow you to embed web pages in a specially-designed environment for your app.
To learn more about WebView and alternatives for serving web content, read the documentation on Web-based content.
Summary
Nested classes
interface
WebView.FindListener
Interface to listen for find results.
class
WebView.HitTestResult
interface
WebView.PictureListener
This interface was deprecated in API level 12. This interface is now obsolete.
class
WebView.VisualStateCallback
Callback interface supplied to WebView.postVisualStateCallback(long, WebView.VisualStateCallback)
for receiving
notifications about the visual state.
class
WebView.WebViewTransport
Transportation object for returning WebView across thread boundaries.
Constants
int
RENDERER_PRIORITY_BOUND
The renderer associated with this WebView is bound with the default priority for services.
int
RENDERER_PRIORITY_IMPORTANT
The renderer associated with this WebView is bound with
Context#BIND_IMPORTANT
.
int
RENDERER_PRIORITY_WAIVED
The renderer associated with this WebView is bound with
Context#BIND_WAIVE_PRIORITY
.
String
SCHEME_GEO
URI scheme for map address.
String
SCHEME_MAILTO
URI scheme for email address.
String
SCHEME_TEL
URI scheme for telephone number.
Inherited fields
From classandroid.view.View
Public constructors
WebView(Context context)
Constructs a new WebView with an Activity Context object.
WebView(Context context, AttributeSet attrs)
Constructs a new WebView with layout parameters.
WebView(Context context, AttributeSet attrs, int defStyleAttr)
Constructs a new WebView with layout parameters and a default style.
WebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)
Constructs a new WebView with layout parameters and a default style.
WebView(Context context, AttributeSet attrs, int defStyleAttr, boolean privateBrowsing)
This constructor is deprecated.
Private browsing is no longer supported directly via
WebView and will be removed in a future release. Prefer using
WebSettings
, WebViewDatabase
, CookieManager
and WebStorage
for fine-grained control of privacy data.
Public methods
void
addJavascriptInterface(Object object, String name)
Injects the supplied Java object into this WebView.
void
autofill(SparseArray<AutofillValue> values)
Automatically fills the content of the virtual children within this view.
boolean
canGoBack()
Gets whether this WebView has a back history item.
boolean
canGoBackOrForward(int steps)
Gets whether the page can go back or forward the given number of steps.
boolean
canGoForward()
Gets whether this WebView has a forward history item.
boolean
canZoomIn()
This method was deprecated
in API level 17.
This method is prone to inaccuracy due to race conditions
between the web rendering and UI threads; prefer
WebViewClient#onScaleChanged
.
boolean
canZoomOut()
This method was deprecated
in API level 17.
This method is prone to inaccuracy due to race conditions
between the web rendering and UI threads; prefer
WebViewClient#onScaleChanged
.
Picture
capturePicture()
This method was deprecated
in API level 19.
Use onDraw(Canvas)
to obtain a bitmap snapshot of the WebView, or
saveWebArchive(String)
to save the content to a file.
void
clearCache(boolean includeDiskFiles)
Clears the resource cache.
static
void
clearClientCertPreferences(Runnable onCleared)
Clears the client certificate preferences stored in response to proceeding/cancelling client cert requests.
void
clearFormData()
Removes the autocomplete popup from the currently focused form field, if present.
void
clearHistory()
Tells this WebView to clear its internal back/forward list.
void
clearMatches()
Clears the highlighting surrounding text matches created by
findAllAsync(String)
.
void
clearSslPreferences()
Clears the SSL preferences table stored in response to proceeding with SSL certificate errors.
void
clearView()
This method was deprecated in API level 18. Use WebView.loadUrl("about:blank") to reliably reset the view state and release page resources (including any running JavaScript).
void
computeScroll()
Called by a parent to request that a child update its values for mScrollX and mScrollY if necessary.
WebBackForwardList
copyBackForwardList()
Gets the WebBackForwardList for this WebView.
PrintDocumentAdapter
createPrintDocumentAdapter(String documentName)
Creates a PrintDocumentAdapter that provides the content of this WebView for printing.
PrintDocumentAdapter
createPrintDocumentAdapter()
This method was deprecated
in API level 21.
Use createPrintDocumentAdapter(java.lang.String)
which requires user
to provide a print document name.
WebMessagePort[]
createWebMessageChannel()
Creates a message channel to communicate with JS and returns the message ports that represent the endpoints of this message channel.
void
destroy()
Destroys the internal state of this WebView.
static
void
disableWebView()
Indicate that the current process does not intend to use WebView, and that an exception should be thrown if a WebView is created or any other methods in the android.webkit package are used.
void
dispatchCreateViewTranslationRequest(Map<AutofillId, long[]> viewIds, int[] supportedFormats, TranslationCapability capability, List<ViewTranslationRequest> requests)
Dispatch to collect the ViewTranslationRequest
s for translation purpose by traversing
the hierarchy when the app requests ui translation.
The implementation calls dispatchCreateViewTranslationRequest(Map, int[], TranslationCapability, List),>
for all the child
views.
boolean
dispatchKeyEvent(KeyEvent event)
Dispatch a key event to the next view on the focus path.
void
documentHasImages(Message response)
Queries the document to see if it contains any image references.
static
void
enableSlowWholeDocumentDraw()
For apps targeting the L release, WebView has a new default behavior that reduces memory footprint and increases performance by intelligently choosing the portion of the HTML document that needs to be drawn.
void
evaluateJavascript(String script, ValueCallback<String> resultCallback)
Asynchronously evaluates JavaScript in the context of the currently displayed page.
static
String
findAddress(String addr)
This method was deprecated
in API level 28.
This method is superseded by TextClassifier#generateLinks(
android.view.textclassifier.TextLinks.Request)
. Avoid using this method even when targeting
API levels where no alternative is available.
int
findAll(String find)
This method was deprecated
in API level 16.
findAllAsync(String)
is preferred.
void
findAllAsync(String find)
Finds all instances of find on the page and highlights them, asynchronously.
View
findFocus()
Find the view in the hierarchy rooted at this view that currently has focus.
void
findNext(boolean forward)
Highlights and scrolls to the next match found by
findAllAsync(String)
, wrapping around page boundaries as necessary.
void
flingScroll(int vx, int vy)
void
freeMemory()
This method was deprecated in API level 19. Memory caches are automatically dropped when no longer needed, and in response to system memory pressure.
CharSequence
getAccessibilityClassName()
Return the class name of this object to be used for accessibility purposes.
AccessibilityNodeProvider
getAccessibilityNodeProvider()
Gets the provider for managing a virtual view hierarchy rooted at this View
and reported to AccessibilityService
s
that explore the window content.
SslCertificate
getCertificate()
Gets the SSL certificate for the main top-level page or null
if there is
no certificate (the site is not secure).
int
getContentHeight()
Gets the height of the HTML content.
static
PackageInfo
getCurrentWebViewPackage()
If WebView has already been loaded into the current process this method will return the package that was used to load it.
Bitmap
getFavicon()
Gets the favicon for the current page.
Handler
getHandler()
WebView.HitTestResult
getHitTestResult()
Gets a HitTestResult based on the current cursor node.
String[]
getHttpAuthUsernamePassword(String host, String realm)
This method was deprecated
in API level 26.
Use WebViewDatabase#getHttpAuthUsernamePassword
instead
String
getOriginalUrl()
Gets the original URL for the current page.
int
getProgress()
Gets the progress for the current page.
boolean
getRendererPriorityWaivedWhenNotVisible()
Return whether this WebView requests a priority of
RENDERER_PRIORITY_WAIVED
when not visible.
int
getRendererRequestedPriority()
Get the requested renderer priority for this WebView.
static
Uri
getSafeBrowsingPrivacyPolicyUrl()
Returns a URL pointing to the privacy policy for Safe Browsing reporting.
float
getScale()
This method was deprecated
in API level 17.
This method is prone to inaccuracy due to race conditions
between the web rendering and UI threads; prefer
WebViewClient#onScaleChanged
.
WebSettings
getSettings()
Gets the WebSettings object used to control the settings for this WebView.
TextClassifier
getTextClassifier()
Returns the TextClassifier
used by this WebView.
String
getTitle()
Gets the title for the current page.
String
getUrl()
Gets the URL for the current page.
WebChromeClient
getWebChromeClient()
Gets the chrome handler.
static
ClassLoader
getWebViewClassLoader()
Returns the ClassLoader
used to load internal WebView classes.
WebViewClient
getWebViewClient()
Gets the WebViewClient.
Looper
getWebViewLooper()
Returns the Looper
corresponding to the thread on which WebView calls must be made.
WebViewRenderProcess
getWebViewRenderProcess()
Gets a handle to the WebView renderer process associated with this WebView.
WebViewRenderProcessClient
getWebViewRenderProcessClient()
Gets the renderer client object associated with this WebView.
void
goBack()
Goes back in the history of this WebView.
void
goBackOrForward(int steps)
Goes to the history item that is the number of steps away from the current item.
void
goForward()
Goes forward in the history of this WebView.
void
invokeZoomPicker()
Invokes the graphical zoom picker widget for this WebView.
boolean
isPrivateBrowsingEnabled()
Gets whether private browsing is enabled in this WebView.
boolean
isVisibleToUserForAutofill(int virtualId)
Computes whether this virtual autofill view is visible to the user.
void
loadData(String data, String mimeType, String encoding)
Loads the given data into this WebView using a 'data' scheme URL.
void
loadDataWithBaseURL(String baseUrl, String data, String mimeType, String encoding, String historyUrl)
Loads the given data into this WebView, using baseUrl as the base URL for the content.
void
loadUrl(String url)
Loads the given URL.
void
loadUrl(String url, Map<String, String> additionalHttpHeaders)
Loads the given URL with additional HTTP headers, specified as a map from name to value.
WindowInsets
onApplyWindowInsets(WindowInsets insets)
Called when the view should apply WindowInsets
according to its internal policy.
boolean
onCheckIsTextEditor()
Check whether the called view is a text editor, in which case it would make sense to automatically display a soft input window for it.
void
onChildViewAdded(View parent, View child)
This method is deprecated. WebView no longer needs to implement ViewGroup.OnHierarchyChangeListener. This method does nothing now.
void
onChildViewRemoved(View p, View child)
This method is deprecated. WebView no longer needs to implement ViewGroup.OnHierarchyChangeListener. This method does nothing now.
InputConnection
onCreateInputConnection(EditorInfo outAttrs)
Creates a new InputConnection for an InputMethod to interact with the WebView.
void
onCreateVirtualViewTranslationRequests(long[] virtualIds, int[] supportedFormats, Consumer<ViewTranslationRequest> requestsCollector)
Collects ViewTranslationRequest
s which represents the content to be translated
for the virtual views in the host view.
boolean
onDragEvent(DragEvent event)
Handles drag events sent by the system following a call to
startDragAndDrop()
.
void
onFinishTemporaryDetach()
Called after onStartTemporaryDetach()
when the container is done
changing the view.
boolean
onGenericMotionEvent(MotionEvent event)
Implement this method to handle generic motion events.
void
onGlobalFocusChanged(View oldFocus, View newFocus)
This method is deprecated. WebView should not have implemented ViewTreeObserver.OnGlobalFocusChangeListener. This method does nothing now.
boolean
onHoverEvent(MotionEvent event)
Implement this method to handle hover events.
boolean
onKeyDown(int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyDown()
: perform press of the view
when KeyEvent#KEYCODE_DPAD_CENTER
or KeyEvent#KEYCODE_ENTER
is released, if the view is enabled and clickable.
boolean
onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyMultiple()
: always returns false (doesn't handle
the event).
boolean
onKeyUp(int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyUp()
: perform clicking of the view
when KeyEvent#KEYCODE_DPAD_CENTER
, KeyEvent#KEYCODE_ENTER
or KeyEvent#KEYCODE_SPACE
is released.
void
onPause()
Does a best-effort attempt to pause any processing that can be paused safely, such as animations and geolocation.
void
onProvideAutofillVirtualStructure(ViewStructure structure, int flags)
Populates a ViewStructure
containing virtual children to fullfil an autofill
request.
The ViewStructure
traditionally represents a View
, while for web pages
it represent HTML nodes.
void
onProvideContentCaptureStructure(ViewStructure structure, int flags)
Populates a ViewStructure
for content capture.
void
onProvideVirtualStructure(ViewStructure structure)
Called when assist structure is being retrieved from a view as part of
Activity.onProvideAssistData
to
generate additional virtual structure under this view.
void
onResume()
Resumes a WebView after a previous call to onPause()
.
void
onStartTemporaryDetach()
This is called when a container is going to temporarily detach a child, with
ViewGroup.detachViewFromParent
.
boolean
onTouchEvent(MotionEvent event)
Implement this method to handle touch screen motion events.
boolean
onTrackballEvent(MotionEvent event)
Implement this method to handle trackball motion events.
void
onVirtualViewTranslationResponses(LongSparseArray<ViewTranslationResponse> response)
Called when the content from View#onCreateVirtualViewTranslationRequests
had been
translated by the TranslationService.
void
onWindowFocusChanged(boolean hasWindowFocus)
Called when the window containing this view gains or loses focus.
boolean
overlayHorizontalScrollbar()
This method was deprecated in API level 23. This method is now obsolete.
boolean
overlayVerticalScrollbar()
This method was deprecated in API level 23. This method is now obsolete.
boolean
pageDown(boolean bottom)
Scrolls the contents of this WebView down by half the page size.
boolean
pageUp(boolean top)
Scrolls the contents of this WebView up by half the view size.
void
pauseTimers()
Pauses all layout, parsing, and JavaScript timers for all WebViews.
boolean
performLongClick()
Calls this view's OnLongClickListener, if it is defined.
void
postUrl(String url, byte[] postData)
Loads the URL with postData using "POST" method into this WebView.
void
postVisualStateCallback(long requestId, WebView.VisualStateCallback callback)
Posts a VisualStateCallback
, which will be called when
the current state of the WebView is ready to be drawn.
void
postWebMessage(WebMessage message, Uri targetOrigin)
Post a message to main frame.
void
reload()
Reloads the current URL.
void
removeJavascriptInterface(String name)
Removes a previously injected Java object from this WebView.
boolean
requestChildRectangleOnScreen(View child, Rect rect, boolean immediate)
Called when a child of this group wants a particular rectangle to be positioned onto the screen.
boolean
requestFocus(int direction, Rect previouslyFocusedRect)
Call this to try to give focus to a specific view or to one of its descendants and give it hints about the direction and a specific rectangle that the focus is coming from.
Looks for a view to give focus to respecting the setting specified by
getDescendantFocusability()
.
void
requestFocusNodeHref(Message hrefMsg)
Requests the anchor or image element URL at the last tapped point.
void
requestImageRef(Message msg)
Requests the URL of the image last touched by the user.
WebBackForwardList
restoreState(Bundle inState)
Restores the state of this WebView from the given Bundle.
void
resumeTimers()
Resumes all layout, parsing, and JavaScript timers for all WebViews.
void
savePassword(String host, String username, String password)
This method was deprecated in API level 18. Saving passwords in WebView will not be supported in future versions.
WebBackForwardList
saveState(Bundle outState)
Saves the state of this WebView used in
Activity.onSaveInstanceState(Bundle)
.
void
saveWebArchive(String filename)
Saves the current view as a web archive.
void
saveWebArchive(String basename, boolean autoname, ValueCallback<String> callback)
Saves the current view as a web archive.
void
setBackgroundColor(int color)
Sets the background color for this view.
void
setCertificate(SslCertificate certificate)
This method was deprecated in API level 17. Calling this function has no useful effect, and will be ignored in future releases.
static
void
setDataDirectorySuffix(String suffix)
Define the directory used to store WebView data for the current process.
void
setDownloadListener(DownloadListener listener)
Registers the interface to be used when content can not be handled by the rendering engine, and should be downloaded instead.
void
setFindListener(WebView.FindListener listener)
Registers the listener to be notified as find-on-page operations progress.
void
setHorizontalScrollbarOverlay(boolean overlay)
This method was deprecated in API level 23. This method has no effect.
void
setHttpAuthUsernamePassword(String host, String realm, String username, String password)
This method was deprecated
in API level 26.
Use WebViewDatabase#setHttpAuthUsernamePassword
instead
void
setInitialScale(int scaleInPercent)
Sets the initial scale for this WebView.
void
setLayerType(int layerType, Paint paint)
Specifies the type of layer backing this view.
void
setLayoutParams(ViewGroup.LayoutParams params)
Set the layout parameters associated with this view.
void
setMapTrackballToArrowKeys(boolean setMap)
This method was deprecated
in API level 17.
Only the default case, true
, will be supported in a future version.
void
setNetworkAvailable(boolean networkUp)
Informs WebView of the network state.
void
setOverScrollMode(int mode)
Set the over-scroll mode for this view.
void
setPictureListener(WebView.PictureListener listener)
This method was deprecated in API level 15. This method is now obsolete.
void
setRendererPriorityPolicy(int rendererRequestedPriority, boolean waivedWhenNotVisible)
Set the renderer priority policy for this WebView
.
static
void
setSafeBrowsingWhitelist(List<String> hosts, ValueCallback<Boolean> callback)
Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks.
void
setScrollBarStyle(int style)
Specify the style of the scrollbars.
void
setTextClassifier(TextClassifier textClassifier)
Sets the TextClassifier
for this WebView.
void
setVerticalScrollbarOverlay(boolean overlay)
This method was deprecated in API level 23. This method has no effect.
void
setWebChromeClient(WebChromeClient client)
Sets the chrome handler.
static
void
setWebContentsDebuggingEnabled(boolean enabled)
Enables debugging of web contents (HTML / CSS / JavaScript) loaded into any WebViews of this application.
void
setWebViewClient(WebViewClient client)
Sets the WebViewClient that will receive various notifications and requests.
void
setWebViewRenderProcessClient(Executor executor, WebViewRenderProcessClient webViewRenderProcessClient)
Sets the renderer client object associated with this WebView.
void
setWebViewRenderProcessClient(WebViewRenderProcessClient webViewRenderProcessClient)
Sets the renderer client object associated with this WebView.
boolean
shouldDelayChildPressedState()
Return true if the pressed state should be delayed for children or descendants of this ViewGroup.
boolean
showFindDialog(String text, boolean showIme)
This method was deprecated in API level 18. This method does not work reliably on all Android versions; implementing a custom find dialog using WebView.findAllAsync() provides a more robust solution.
static
void
startSafeBrowsing(Context context, ValueCallback<Boolean> callback)
Starts Safe Browsing initialization.
void
stopLoading()
Stops the current load.
void
zoomBy(float zoomFactor)
Performs a zoom operation in this WebView.
boolean
zoomIn()
Performs zoom in in this WebView.
boolean
zoomOut()
Performs zoom out in this WebView.
Protected methods
int
computeHorizontalScrollOffset()
Compute the horizontal offset of the horizontal scrollbar's thumb within the horizontal range.
int
computeHorizontalScrollRange()
Compute the horizontal range that the horizontal scrollbar represents.
int
computeVerticalScrollExtent()
Compute the vertical extent of the vertical scrollbar's thumb within the vertical range.
int
computeVerticalScrollOffset()
Compute the vertical offset of the vertical scrollbar's thumb within the horizontal range.
int
computeVerticalScrollRange()
Compute the vertical range that the vertical scrollbar represents.
void
dispatchDraw(Canvas canvas)
Called by draw to draw the child views.
void
onAttachedToWindow()
This is called when the view is attached to a window.
void
onConfigurationChanged(Configuration newConfig)
Called when the current configuration of the resources being used by the application have changed.
void
onDraw(Canvas canvas)
Implement this to do your drawing.
void
onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect)
Called by the view system when the focus state of this view changes.
void
onMeasure(int widthMeasureSpec, int heightMeasureSpec)
Measure the view and its content to determine the measured width and the measured height.
void
onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY)
Called by overScrollBy(int, int, int, int, int, int, int, int, boolean)
to
respond to the results of an over-scroll operation.
void
onScrollChanged(int l, int t, int oldl, int oldt)
This is called in response to an internal scroll in this view (i.e., the view scrolled its own contents).
void
onSizeChanged(int w, int h, int ow, int oh)
This is called during layout when the size of this view has changed.
void
onVisibilityChanged(View changedView, int visibility)
Called when the visibility of the view or an ancestor of the view has changed.
void
onWindowVisibilityChanged(int visibility)
Called when the window containing has change its visibility
(between GONE
, INVISIBLE
, and VISIBLE
).
Constants
RENDERER_PRIORITY_BOUND
public static final int RENDERER_PRIORITY_BOUND
The renderer associated with this WebView is bound with the default priority for services.
Use with setRendererPriorityPolicy(int, boolean)
.
Constant Value: 1 (0x00000001)
RENDERER_PRIORITY_IMPORTANT
public static final int RENDERER_PRIORITY_IMPORTANT
The renderer associated with this WebView is bound with
Context#BIND_IMPORTANT
.
Use with setRendererPriorityPolicy(int, boolean)
.
Constant Value: 2 (0x00000002)
RENDERER_PRIORITY_WAIVED
public static final int RENDERER_PRIORITY_WAIVED
The renderer associated with this WebView is bound with
Context#BIND_WAIVE_PRIORITY
. At this priority level
WebView
renderers will be strong targets for out of memory
killing.
Use with setRendererPriorityPolicy(int, boolean)
.
Constant Value: 0 (0x00000000)
SCHEME_GEO
public static final String SCHEME_GEO
URI scheme for map address.
Constant Value: "geo:0,0?q="
SCHEME_MAILTO
public static final String SCHEME_MAILTO
URI scheme for email address.
Constant Value: "mailto:"
SCHEME_TEL
public static final String SCHEME_TEL
URI scheme for telephone number.
Constant Value: "tel:"
Public constructors
WebView
public WebView (Context context)
Constructs a new WebView with an Activity Context object.
Note: WebView should always be instantiated with an Activity Context. If instantiated with an Application Context, WebView will be unable to provide several features, such as JavaScript dialogs and autofill.
context
Context
: an Activity Context to access application assets
This value cannot be null
.
WebView
public WebView (Context context, AttributeSet attrs)
Constructs a new WebView with layout parameters.
context
Context
: an Activity Context to access application assets
This value cannot be null
.
attrs
AttributeSet
: an AttributeSet passed to our parent
This value may be null
.
WebView
public WebView (Context context, AttributeSet attrs, int defStyleAttr)
Constructs a new WebView with layout parameters and a default style.
context
Context
: an Activity Context to access application assets
This value cannot be null
.
attrs
AttributeSet
: an AttributeSet passed to our parent
This value may be null
.
defStyleAttr
int
: an attribute in the current theme that contains a
reference to a style resource that supplies default values for
the view. Can be 0 to not look for defaults.
WebView
public WebView (Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)
Constructs a new WebView with layout parameters and a default style.
context
Context
: an Activity Context to access application assets
This value cannot be null
.
attrs
AttributeSet
: an AttributeSet passed to our parent
This value may be null
.
defStyleAttr
int
: an attribute in the current theme that contains a
reference to a style resource that supplies default values for
the view. Can be 0 to not look for defaults.
defStyleRes
int
: a resource identifier of a style resource that
supplies default values for the view, used only if
defStyleAttr is 0 or can not be found in the theme. Can be 0
to not look for defaults.
WebView
public WebView (Context context, AttributeSet attrs, int defStyleAttr, boolean privateBrowsing)
This constructor is deprecated.
Private browsing is no longer supported directly via
WebView and will be removed in a future release. Prefer using
WebSettings
, WebViewDatabase
, CookieManager
and WebStorage
for fine-grained control of privacy data.
Constructs a new WebView with layout parameters and a default style.
context
Context
: an Activity Context to access application assets
This value cannot be null
.
attrs
AttributeSet
: an AttributeSet passed to our parent
This value may be null
.
defStyleAttr
int
: an attribute in the current theme that contains a
reference to a style resource that supplies default values for
the view. Can be 0 to not look for defaults.
privateBrowsing
boolean
: whether this WebView will be initialized in
private mode
Public methods
addJavascriptInterface
public void addJavascriptInterface (Object object, String name)
Injects the supplied Java object into this WebView. The object is
injected into all frames of the web page, including all the iframes,
using the supplied name. This allows the Java object's methods to be
accessed from JavaScript. For applications targeted to API
level Build.VERSION_CODES.JELLY_BEAN_MR1
and above, only public methods that are annotated with
JavascriptInterface
can be accessed from JavaScript.
For applications targeted to API level Build.VERSION_CODES.JELLY_BEAN
or below,
all public methods (including the inherited ones) can be accessed, see the
important security note below for implications.
Note that injected objects will not appear in JavaScript until the page is next (re)loaded. JavaScript should be enabled before injecting the object. For example:
class JsObject {
@JavascriptInterface
public String toString() { return "injectedObject"; }
}
webview.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(new JsObject(), "injectedObject");
webView.loadData("", "text/html", null);
webView.loadUrl("javascript:alert(injectedObject.toString())");
IMPORTANT:
- This method can be used to allow JavaScript to control the host
application. This is a powerful feature, but also presents a security
risk for apps targeting
Build.VERSION_CODES.JELLY_BEAN
or earlier. Apps that target a version later thanBuild.VERSION_CODES.JELLY_BEAN
are still vulnerable if the app runs on a device running Android earlier than 4.2. The most secure way to use this method is to targetBuild.VERSION_CODES.JELLY_BEAN_MR1
and to ensure the method is called only when running on Android 4.2 or later. With these older versions, JavaScript could use reflection to access an injected object's public fields. Use of this method in a WebView containing untrusted content could allow an attacker to manipulate the host application in unintended ways, executing Java code with the permissions of the host application. Use extreme care when using this method in a WebView which could contain untrusted content. - JavaScript interacts with Java object on a private, background thread of this WebView. Care is therefore required to maintain thread safety.
- Because the object is exposed to all the frames, any frame could obtain the object name and call methods on it. There is no way to tell the calling frame's origin from the app side, so the app must not assume that the caller is trustworthy unless the app can guarantee that no third party content is ever loaded into the WebView even inside an iframe.
- The Java object's fields are not accessible.
- For applications targeted to API level
Build.VERSION_CODES.LOLLIPOP
and above, methods of injected Java objects are enumerable from JavaScript.
object
Object
: the Java object to inject into this WebView's JavaScript
context. null
values are ignored.
This value cannot be null
.
name
String
: the name used to expose the object in JavaScript
This value cannot be null
.
autofill
public void autofill (SparseArray<AutofillValue> values)
Automatically fills the content of the virtual children within this view.
Views with virtual children support the Autofill Framework mainly by:
- Providing the metadata defining what the virtual children mean and how they can be autofilled.
- Implementing the methods that autofill the virtual children.
onProvideAutofillVirtualStructure(android.view.ViewStructure, int)
is responsible for the
former, this method is responsible for the latter - see autofill(android.view.autofill.AutofillValue)
and
onProvideAutofillVirtualStructure(android.view.ViewStructure, int)
for more info about autofill.
If a child value is updated asynchronously, the next call to
AutofillManager#notifyValueChanged(View, int, AutofillValue)
must happen
after the value was changed to the autofilled value. If not, the child will not be
considered autofilled.
Note: To indicate that a virtual view was autofilled,
?android:attr/autofilledHighlight
should be drawn over it until the data
changes.
Parametersvalues
SparseArray
: map of values to be autofilled, keyed by virtual child id.
This value cannot be null
.
canGoBack
public boolean canGoBack ()
Gets whether this WebView has a back history item.
boolean
true
if this WebView has a back history item
canGoBackOrForward
public boolean canGoBackOrForward (int steps)
Gets whether the page can go back or forward the given number of steps.
steps
int
: the negative or positive number of steps to move the
history
boolean
canGoForward
public boolean canGoForward ()
Gets whether this WebView has a forward history item.
boolean
true
if this WebView has a forward history item
canZoomIn
public boolean canZoomIn ()
This method was deprecated
in API level 17.
This method is prone to inaccuracy due to race conditions
between the web rendering and UI threads; prefer
WebViewClient#onScaleChanged
.
Gets whether this WebView can be zoomed in.
boolean
true
if this WebView can be zoomed in
canZoomOut
public boolean canZoomOut ()
This method was deprecated
in API level 17.
This method is prone to inaccuracy due to race conditions
between the web rendering and UI threads; prefer
WebViewClient#onScaleChanged
.
Gets whether this WebView can be zoomed out.
boolean
true
if this WebView can be zoomed out
capturePicture
public Picture capturePicture ()
This method was deprecated
in API level 19.
Use onDraw(Canvas)
to obtain a bitmap snapshot of the WebView, or
saveWebArchive(String)
to save the content to a file.
Gets a new picture that captures the current contents of this WebView. The picture is of the entire document being displayed, and is not limited to the area currently displayed by this WebView. Also, the picture is a static copy and is unaffected by later changes to the content being displayed.
Note that due to internal changes, for API levels between
Build.VERSION_CODES.HONEYCOMB
and
Build.VERSION_CODES.ICE_CREAM_SANDWICH
inclusive, the
picture does not include fixed position elements or scrollable divs.
Note that from Build.VERSION_CODES.JELLY_BEAN_MR1
the returned picture
should only be drawn into bitmap-backed Canvas - using any other type of Canvas will involve
additional conversion at a cost in memory and performance.
Picture
a picture that captures the current contents of this WebView
clearCache
public void clearCache (boolean includeDiskFiles)
Clears the resource cache. Note that the cache is per-application, so this will clear the cache for all WebViews used.
includeDiskFiles
boolean
: if false
, only the RAM cache is cleared
clearClientCertPreferences
public static void clearClientCertPreferences (Runnable onCleared)
Clears the client certificate preferences stored in response to proceeding/cancelling client cert requests. Note that WebView automatically clears these preferences when the system keychain is updated. The preferences are shared by all the WebViews that are created by the embedder application.
onCleared
Runnable
: A runnable to be invoked when client certs are cleared.
The runnable will be called in UI thread.
This value may be null
.
clearFormData
public void clearFormData ()
Removes the autocomplete popup from the currently focused form field, if
present. Note this only affects the display of the autocomplete popup,
it does not remove any saved form data from this WebView's store. To do
that, use WebViewDatabase#clearFormData
.
clearHistory
public void clearHistory ()
Tells this WebView to clear its internal back/forward list.
clearMatches
public void clearMatches ()
Clears the highlighting surrounding text matches created by
findAllAsync(String)
.
clearSslPreferences
public void clearSslPreferences ()
Clears the SSL preferences table stored in response to proceeding with SSL certificate errors.
clearView
public void clearView ()
This method was deprecated
in API level 18.
Use WebView.loadUrl("about:blank") to reliably reset the view state
and release page resources (including any running JavaScript).
Clears this WebView so that onDraw() will draw nothing but white background, and onMeasure() will return 0 if MeasureSpec is not MeasureSpec.EXACTLY.
computeScroll
public void computeScroll ()
Called by a parent to request that a child update its values for mScrollX
and mScrollY if necessary. This will typically be done if the child is
animating a scroll using a Scroller
object.
copyBackForwardList
public WebBackForwardList copyBackForwardList ()
Gets the WebBackForwardList for this WebView. This contains the back/forward list for use in querying each item in the history stack. This is a copy of the private WebBackForwardList so it contains only a snapshot of the current state. Multiple calls to this method may return different objects. The object returned from this method will not be updated to reflect any new state.
WebBackForwardList
This value cannot be null
.
createPrintDocumentAdapter
public PrintDocumentAdapter createPrintDocumentAdapter (String documentName)
Creates a PrintDocumentAdapter that provides the content of this WebView for printing.
The adapter works by converting the WebView contents to a PDF stream. The WebView cannot
be drawn during the conversion process - any such draws are undefined. It is recommended
to use a dedicated off screen WebView for the printing. If necessary, an application may
temporarily hide a visible WebView by using a custom PrintDocumentAdapter instance
wrapped around the object returned and observing the onStart and onFinish methods. See
PrintDocumentAdapter
for more information.
documentName
String
: The user-facing name of the printed document. See
PrintDocumentInfo
This value cannot be null
.
PrintDocumentAdapter
This value cannot be null
.
createPrintDocumentAdapter
public PrintDocumentAdapter createPrintDocumentAdapter ()
This method was deprecated
in API level 21.
Use createPrintDocumentAdapter(java.lang.String)
which requires user
to provide a print document name.
PrintDocumentAdapter
createWebMessageChannel
public WebMessagePort[] createWebMessageChannel ()
Creates a message channel to communicate with JS and returns the message ports that represent the endpoints of this message channel. The HTML5 message channel functionality is described here
The returned message channels are entangled and already in started state.
WebMessagePort[]
the two message ports that form the message channel.
This value cannot be null
.
destroy
public void destroy ()
Destroys the internal state of this WebView. This method should be called after this WebView has been removed from the view system. No other methods may be called on this WebView after destroy.
disableWebView
public static void disableWebView ()
Indicate that the current process does not intend to use WebView, and that an exception should be thrown if a WebView is created or any other methods in the android.webkit package are used.
Applications with multiple processes may wish to call this in processes
that are not intended to use WebView to avoid accidentally incurring
the memory usage of initializing WebView in long-lived processes that
have no need for it, and to prevent potential data directory conflicts
(see setDataDirectorySuffix(String)
).
For example, an audio player application with one process for its
activities and another process for its playback service may wish to call
this method in the playback service's Service.onCreate()
.
IllegalStateException
if WebView has already been initialized
in the current process.
dispatchCreateViewTranslationRequest
public void dispatchCreateViewTranslationRequest (Map<AutofillId, long[]> viewIds, int[] supportedFormats, TranslationCapability capability, List<ViewTranslationRequest> requests)
Dispatch to collect the ViewTranslationRequest
s for translation purpose by traversing
the hierarchy when the app requests ui translation. Typically, this method should only be
overridden by subclasses that provide a view hierarchy (such as ViewGroup
). Other
classes should override View#onCreateViewTranslationRequest
for normal view or
override View#onVirtualViewTranslationResponses
for view contains virtual children.
This should traverse the
view hierarchy to collect ViewTranslationRequest
s and create a
Translator
to translate the requests. All the
ViewTranslationRequest
s must be added when the traversal is done.
The default implementation calls View#onCreateViewTranslationRequest
for normal
view or calls View#onVirtualViewTranslationResponses
for view contains virtual
children to build ViewTranslationRequest
if the view should be translated.
The view is marked as having transient state
so that
recycling of views doesn't prevent the system from attaching the response to it. Therefore,
if overriding this method, you should set or reset the transient state.
The implementation calls dispatchCreateViewTranslationRequest(Map, int[], TranslationCapability, List),>
for all the child
views.
viewIds
Map
: This value cannot be null
.
supportedFormats
int
: This value cannot be null
.
Value is TranslationSpec.DATA_FORMAT_TEXT
capability
TranslationCapability
: This value may be null
.
requests
List
: This value cannot be null
.
dispatchKeyEvent
public boolean dispatchKeyEvent (KeyEvent event)
Dispatch a key event to the next view on the focus path. This path runs from the top of the view tree down to the currently focused view. If this view has focus, it will dispatch to itself. Otherwise it will dispatch the next node down the focus path. This method also fires any key listeners.
event
KeyEvent
: The key event to be dispatched.
boolean
True if the event was handled, false otherwise.
documentHasImages
public void documentHasImages (Message response)
Queries the document to see if it contains any image references. The message object will be dispatched with arg1 being set to 1 if images were found and 0 if the document does not reference any images.
response
Message
: the message that will be dispatched with the result
This value cannot be null
.
enableSlowWholeDocumentDraw
public static void enableSlowWholeDocumentDraw ()
For apps targeting the L release, WebView has a new default behavior that reduces memory footprint and increases performance by intelligently choosing the portion of the HTML document that needs to be drawn. These optimizations are transparent to the developers. However, under certain circumstances, an App developer may want to disable them:
- When an app uses
onDraw(Canvas)
to do own drawing and accesses portions of the page that is way outside the visible portion of the page. - When an app uses
capturePicture()
to capture a very large HTML document. Note that capturePicture is a deprecated API.
evaluateJavascript
public void evaluateJavascript (String script, ValueCallback<String> resultCallback)
Asynchronously evaluates JavaScript in the context of the currently displayed page.
If non-null, resultCallback
will be invoked with any result returned from that
execution. This method must be called on the UI thread and the callback will
be made on the UI thread.
Compatibility note. Applications targeting Build.VERSION_CODES.N
or
later, JavaScript state from an empty WebView is no longer persisted across navigations like
loadUrl(java.lang.String)
. For example, global variables and functions defined before calling
loadUrl(java.lang.String)
will not exist in the loaded page. Applications should use
addJavascriptInterface(Object, String)
instead to persist JavaScript objects across navigations.
script
String
: the JavaScript to execute.
This value cannot be null
.
resultCallback
ValueCallback
: A callback to be invoked when the script execution
completes with the result of the execution (if any).
May be null
if no notification of the result is required.
This value may be null
.
findAddress
public static String findAddress (String addr)
This method was deprecated
in API level 28.
This method is superseded by TextClassifier#generateLinks(
android.view.textclassifier.TextLinks.Request)
. Avoid using this method even when targeting
API levels where no alternative is available.
Gets the first substring which appears to be the address of a physical location. Only addresses in the United States can be detected, which must consist of:
- a house number
- a street name
- a street type (Road, Circle, etc), either spelled out or abbreviated
- a city name
- a state or territory, either spelled out or two-letter abbr
- an optional 5 digit or 9 digit zip code
All names must be correctly capitalized, and the zip code, if present, must be valid for the state. The street type must be a standard USPS spelling or abbreviation. The state or territory must also be spelled or abbreviated using USPS standards. The house number may not exceed five digits.
Note: This function is deprecated and should be
avoided on all API levels, as it cannot detect addresses outside of the
United States and has a high rate of false positives. On API level
Build.VERSION_CODES.O_MR1
and earlier, it also causes
the entire WebView implementation to be loaded and initialized, which
can throw AndroidRuntimeException
or other exceptions
if the WebView implementation is currently being updated.
addr
String
: the string to search for addresses
String
the address, or if no address is found, null
findAll
public int findAll (String find)
This method was deprecated
in API level 16.findAllAsync(String)
is preferred.
Finds all instances of find on the page and highlights them.
Notifies any registered FindListener
.
find
String
: the string to find
int
the number of occurrences of the String "find" that were found
See also:
findAllAsync
public void findAllAsync (String find)
Finds all instances of find on the page and highlights them,
asynchronously. Notifies any registered FindListener
.
Successive calls to this will cancel any pending searches.
find
String
: the string to find.
This value cannot be null
.
See also:
findFocus
public View findFocus ()
Find the view in the hierarchy rooted at this view that currently has focus.
View
The view that currently has focus, or null if no focused view can
be found.
findNext
public void findNext (boolean forward)
Highlights and scrolls to the next match found by
findAllAsync(String)
, wrapping around page boundaries as necessary.
Notifies any registered FindListener
. If findAllAsync(java.lang.String)
has not been called yet, or if clearMatches()
has been called since the
last find operation, this function does nothing.
forward
boolean
: the direction to search
See also:
flingScroll
public void flingScroll (int vx, int vy)
vx
int
vy
int
freeMemory
public void freeMemory ()
This method was deprecated
in API level 19.
Memory caches are automatically dropped when no longer needed, and in response
to system memory pressure.
Informs this WebView that memory is low so that it can free any available memory.
getAccessibilityClassName
public CharSequence getAccessibilityClassName ()
Return the class name of this object to be used for accessibility purposes.
Subclasses should only override this if they are implementing something that
should be seen as a completely new class of view when used by accessibility,
unrelated to the class it is deriving from. This is used to fill in
AccessibilityNodeInfo.setClassName
.
CharSequence
getAccessibilityNodeProvider
public AccessibilityNodeProvider getAccessibilityNodeProvider ()
Gets the provider for managing a virtual view hierarchy rooted at this View
and reported to AccessibilityService
s
that explore the window content.
If this method returns an instance, this instance is responsible for managing
AccessibilityNodeInfo
s describing the virtual sub-tree rooted at this
View including the one representing the View itself. Similarly the returned
instance is responsible for performing accessibility actions on any virtual
view or the root view itself.
If an AccessibilityDelegate
has been specified via calling
setAccessibilityDelegate(android.view.View.AccessibilityDelegate)
its
AccessibilityDelegate#getAccessibilityNodeProvider(View)
is responsible for handling this call.
AccessibilityNodeProvider
The provider.
getCertificate
public SslCertificate getCertificate ()
Gets the SSL certificate for the main top-level page or null
if there is
no certificate (the site is not secure).
SslCertificate
the SSL certificate for the main top-level page
getContentHeight
public int getContentHeight ()
Gets the height of the HTML content.
int
the height of the HTML content
getCurrentWebViewPackage
public static PackageInfo getCurrentWebViewPackage ()
If WebView has already been loaded into the current process this method will return the package that was used to load it. Otherwise, the package that would be used if the WebView was loaded right now will be returned; this does not cause WebView to be loaded, so this information may become outdated at any time. The WebView package changes either when the current WebView package is updated, disabled, or uninstalled. It can also be changed through a Developer Setting. If the WebView package changes, any app process that has loaded WebView will be killed. The next time the app starts and loads WebView it will use the new WebView package instead.
PackageInfo
the current WebView package, or null
if there is none.
getFavicon
public Bitmap getFavicon ()
Gets the favicon for the current page. This is the favicon of the current page until WebViewClient.onReceivedIcon is called.
Bitmap
the favicon for the current page or null
if the page doesn't
have one or if no page has been loaded
getHandler
public Handler getHandler ()
Handler
A handler associated with the thread running the View. This
handler can be used to pump events in the UI events queue.
getHitTestResult
public WebView.HitTestResult getHitTestResult ()
Gets a HitTestResult based on the current cursor node. If a HTML::a
tag is found and the anchor has a non-JavaScript URL, the HitTestResult
type is set to SRC_ANCHOR_TYPE and the URL is set in the "extra" field.
If the anchor does not have a URL or if it is a JavaScript URL, the type
will be UNKNOWN_TYPE and the URL has to be retrieved through
requestFocusNodeHref(Message)
asynchronously. If a HTML::img tag is
found, the HitTestResult type is set to IMAGE_TYPE and the URL is set in
the "extra" field. A type of
SRC_IMAGE_ANCHOR_TYPE indicates an anchor with a URL that has an image as
a child node. If a phone number is found, the HitTestResult type is set
to PHONE_TYPE and the phone number is set in the "extra" field of
HitTestResult. If a map address is found, the HitTestResult type is set
to GEO_TYPE and the address is set in the "extra" field of HitTestResult.
If an email address is found, the HitTestResult type is set to EMAIL_TYPE
and the email is set in the "extra" field of HitTestResult. Otherwise,
HitTestResult type is set to UNKNOWN_TYPE.
WebView.HitTestResult
This value cannot be null
.
getHttpAuthUsernamePassword
public String[] getHttpAuthUsernamePassword (String host, String realm)
This method was deprecated
in API level 26.
Use WebViewDatabase#getHttpAuthUsernamePassword
instead
Retrieves HTTP authentication credentials for a given host and realm from the WebViewDatabase
instance.
host
String
: the host to which the credentials apply
realm
String
: the realm to which the credentials apply
String[]
the credentials as a String array, if found. The first element
is the username and the second element is the password. null
if
no credentials are found.
getOriginalUrl
public String getOriginalUrl ()
Gets the original URL for the current page. This is not always the same as the URL passed to WebViewClient.onPageStarted because although the load for that URL has begun, the current page may not have changed. Also, there may have been redirects resulting in a different URL to that originally requested.
String
the URL that was originally requested for the current page or
null
if no page has been loaded
getProgress
public int getProgress ()
Gets the progress for the current page.
int
the progress for the current page between 0 and 100
getRendererPriorityWaivedWhenNotVisible
public boolean getRendererPriorityWaivedWhenNotVisible ()
Return whether this WebView requests a priority of
RENDERER_PRIORITY_WAIVED
when not visible.
boolean
whether this WebView requests a priority of
RENDERER_PRIORITY_WAIVED
when not visible.
getRendererRequestedPriority
public int getRendererRequestedPriority ()
Get the requested renderer priority for this WebView.
getSafeBrowsingPrivacyPolicyUrl
public static Uri getSafeBrowsingPrivacyPolicyUrl ()
Returns a URL pointing to the privacy policy for Safe Browsing reporting.
Uri
the url pointing to a privacy policy document which can be displayed to users.
This value cannot be null
.
getScale
public float getScale ()
This method was deprecated
in API level 17.
This method is prone to inaccuracy due to race conditions
between the web rendering and UI threads; prefer
WebViewClient#onScaleChanged
.
Gets the current scale of this WebView.
float
the current scale
getSettings
public WebSettings getSettings ()
Gets the WebSettings object used to control the settings for this WebView.
WebSettings
a WebSettings object that can be used to control this WebView's
settings
This value cannot be null
.
getTextClassifier
public TextClassifier getTextClassifier ()
Returns the TextClassifier
used by this WebView.
If no TextClassifier has been set, this WebView uses the default set by the system.
TextClassifier
This value cannot be null
.
getTitle
public String getTitle ()
Gets the title for the current page. This is the title of the current page until WebViewClient.onReceivedTitle is called.
String
the title for the current page or null
if no page has been loaded
getUrl
public String getUrl ()
Gets the URL for the current page. This is not always the same as the URL passed to WebViewClient.onPageStarted because although the load for that URL has begun, the current page may not have changed.
String
the URL for the current page or null
if no page has been loaded
getWebChromeClient
public WebChromeClient getWebChromeClient ()
Gets the chrome handler.
WebChromeClient
the WebChromeClient, or null
if not yet set
See also:
getWebViewClassLoader
public static ClassLoader getWebViewClassLoader ()
Returns the ClassLoader
used to load internal WebView classes.
This method is meant for use by the WebView Support Library, there is no reason to use this
method otherwise.
ClassLoader
This value cannot be null
.
getWebViewClient
public WebViewClient getWebViewClient ()
Gets the WebViewClient.
WebViewClient
the WebViewClient, or a default client if not yet set
This value cannot be null
.
See also:
getWebViewLooper
public Looper getWebViewLooper ()
Returns the Looper
corresponding to the thread on which WebView calls must be made.
Looper
This value cannot be null
.
getWebViewRenderProcess
public WebViewRenderProcess getWebViewRenderProcess ()
Gets a handle to the WebView renderer process associated with this WebView.
In Build.VERSION_CODES.O
and above, WebView may
run in "multiprocess" mode. In multiprocess mode, rendering of web
content is performed by a sandboxed renderer process separate to the
application process. This renderer process may be shared with other
WebViews in the application, but is not shared with other application
processes.
If WebView is running in multiprocess mode, this method returns a handle to the renderer process associated with the WebView, which can be used to control the renderer process.
WebViewRenderProcess
the WebViewRenderProcess
renderer handle associated
with this WebView
, or null
if
WebView is not runing in multiprocess mode.
getWebViewRenderProcessClient
public WebViewRenderProcessClient getWebViewRenderProcessClient ()
Gets the renderer client object associated with this WebView.
goBack
public void goBack ()
Goes back in the history of this WebView.
goBackOrForward
public void goBackOrForward (int steps)
Goes to the history item that is the number of steps away from the current item. Steps is negative if backward and positive if forward.
steps
int
: the number of steps to take back or forward in the back
forward list
goForward
public void goForward ()
Goes forward in the history of this WebView.
invokeZoomPicker
public void invokeZoomPicker ()
Invokes the graphical zoom picker widget for this WebView. This will result in the zoom widget appearing on the screen to control the zoom level of this WebView.
isPrivateBrowsingEnabled
public boolean isPrivateBrowsingEnabled ()
Gets whether private browsing is enabled in this WebView.
boolean
isVisibleToUserForAutofill
public boolean isVisibleToUserForAutofill (int virtualId)
Computes whether this virtual autofill view is visible to the user.
Note: By default it returns true
, but views providing a virtual hierarchy
view must override it.
virtualId
int
boolean
Whether the view is visible on the screen.
loadData
public void loadData (String data, String mimeType, String encoding)
Loads the given data into this WebView using a 'data' scheme URL.
Note that JavaScript's same origin policy means that script running in a
page loaded using this method will be unable to access content loaded
using any scheme other than 'data', including 'http(s)'. To avoid this
restriction, use loadDataWithBaseURL()
with an appropriate base URL.
The encoding
parameter specifies whether the data is base64 or URL
encoded. If the data is base64 encoded, the value of the encoding
parameter must be "base64"
. HTML can be encoded with Base64.encodeToString(byte[], int)
like so:
String unencodedHtml =
"<html><body>'%28' is the code for '('</body></html>";
String encodedHtml = Base64.encodeToString(unencodedHtml.getBytes(), Base64.NO_PADDING);
webView.loadData(encodedHtml, "text/html", "base64");
For all other values of encoding
(including null
) it is assumed that the
data uses ASCII encoding for octets inside the range of safe URL characters and use the
standard %xx hex encoding of URLs for octets outside that range. See RFC 3986 for more information.
Applications targeting Build.VERSION_CODES.Q
or later must either use
base64 or encode any #
characters in the content as %23
, otherwise they
will be treated as the end of the content and the remaining text used as a document
fragment identifier.
The mimeType
parameter specifies the format of the data.
If WebView can't handle the specified MIME type, it will download the data.
If null
, defaults to 'text/html'.
The 'data' scheme URL formed by this method uses the default US-ASCII
charset. If you need to set a different charset, you should form a
'data' scheme URL which explicitly specifies a charset parameter in the
mediatype portion of the URL and call loadUrl(java.lang.String)
instead.
Note that the charset obtained from the mediatype portion of a data URL
always overrides that specified in the HTML or XML document itself.
Content loaded using this method will have a window.origin
value
of "null"
. This must not be considered to be a trusted origin
by the application or by any JavaScript code running inside the WebView
(for example, event sources in DOM event handlers or web messages),
because malicious content can also create frames with a null origin. If
you need to identify the main frame's origin in a trustworthy way, you
should use loadDataWithBaseURL()
with a valid HTTP or HTTPS base URL to set the
origin.
data
String
: a String of data in the given encoding
This value cannot be null
.
mimeType
String
: the MIME type of the data, e.g. 'text/html'.
This value may be null
.
encoding
String
: the encoding of the data
This value may be null
.
loadDataWithBaseURL
public void loadDataWithBaseURL (String baseUrl, String data, String mimeType, String encoding, String historyUrl)
Loads the given data into this WebView, using baseUrl as the base URL for the content. The base URL is used both to resolve relative URLs and when applying JavaScript's same origin policy. The historyUrl is used for the history entry.
The mimeType
parameter specifies the format of the data.
If WebView can't handle the specified MIME type, it will download the data.
If null
, defaults to 'text/html'.
Note that content specified in this way can access local device files (via 'file' scheme URLs) only if baseUrl specifies a scheme other than 'http', 'https', 'ftp', 'ftps', 'about' or 'javascript'.
If the base URL uses the data scheme, this method is equivalent to
calling loadData()
and the
historyUrl is ignored, and the data will be treated as part of a data: URL,
including the requirement that the content be URL-encoded or base64 encoded.
If the base URL uses any other scheme, then the data will be loaded into
the WebView as a plain string (i.e. not part of a data URL) and any URL-encoded
entities in the string will not be decoded.
Note that the baseUrl is sent in the 'Referer' HTTP header when requesting subresources (images, etc.) of the page loaded using this method.
If a valid HTTP or HTTPS base URL is not specified in baseUrl
, then
content loaded using this method will have a window.origin
value
of "null"
. This must not be considered to be a trusted origin
by the application or by any JavaScript code running inside the WebView
(for example, event sources in DOM event handlers or web messages),
because malicious content can also create frames with a null origin. If
you need to identify the main frame's origin in a trustworthy way, you
should use a valid HTTP or HTTPS base URL to set the origin.
baseUrl
String
: the URL to use as the page's base URL. If null
defaults to
'about:blank'.
This value may be null
.
data
String
: a String of data in the given encoding
This value cannot be null
.
mimeType
String
: the MIME type of the data, e.g. 'text/html'.
This value may be null
.
encoding
String
: the encoding of the data
This value may be null
.
historyUrl
String
: the URL to use as the history entry. If null
defaults
to 'about:blank'. If non-null, this must be a valid URL.
This value may be null
.
loadUrl
public void loadUrl (String url)
Loads the given URL.
Also see compatibility note on evaluateJavascript(String, ValueCallback)
.
url
String
: the URL of the resource to load
This value cannot be null
.
loadUrl
public void loadUrl (String url, Map<String, String> additionalHttpHeaders)
Loads the given URL with additional HTTP headers, specified as a map from name to value. Note that if this map contains any of the headers that are set by default by this WebView, such as those controlling caching, accept types or the User-Agent, their values may be overridden by this WebView's defaults.
Some older WebView implementations require additionalHttpHeaders
to be mutable.
Also see compatibility note on evaluateJavascript(String, ValueCallback)
.
url
String
: the URL of the resource to load
This value cannot be null
.
additionalHttpHeaders
Map
: map with additional headers
This value cannot be null
.
onApplyWindowInsets
public WindowInsets onApplyWindowInsets (WindowInsets insets)
Called when the view should apply WindowInsets
according to its internal policy.
This method should be overridden by views that wish to apply a policy different from or
in addition to the default behavior. Clients that wish to force a view subtree
to apply insets should call dispatchApplyWindowInsets(android.view.WindowInsets)
.
Clients may supply an OnApplyWindowInsetsListener
to a view. If one is set
it will be called during dispatch instead of this method. The listener may optionally
call this method from its own implementation if it wishes to apply the view's default
insets policy in addition to its own.
Implementations of this method should either return the insets parameter unchanged
or a new WindowInsets
cloned from the supplied insets with any insets consumed
that this view applied itself. This allows new inset types added in future platform
versions to pass through existing implementations unchanged without being erroneously
consumed.
By default if a view's fitsSystemWindows
property is set then the view will consume the system window insets and apply them
as padding for the view.
insets
WindowInsets
: Insets to apply
WindowInsets
The supplied insets with any applied insets consumed
onCheckIsTextEditor
public boolean onCheckIsTextEditor ()
Check whether the called view is a text editor, in which case it
would make sense to automatically display a soft input window for
it. Subclasses should override this if they implement
onCreateInputConnection(android.view.inputmethod.EditorInfo)
to return true if
a call on that method would return a non-null InputConnection, and
they are really a first-class editor that the user would normally
start typing on when the go into a window containing your view.
The default implementation always returns false. This does
not mean that its onCreateInputConnection(android.view.inputmethod.EditorInfo)
will not be called or the user can not otherwise perform edits on your
view; it is just a hint to the system that this is not the primary
purpose of this view.
boolean
Returns true if this view is a text editor, else false.
onChildViewAdded
public void onChildViewAdded (View parent, View child)
This method is deprecated.
WebView no longer needs to implement
ViewGroup.OnHierarchyChangeListener. This method does nothing now.
Called when a new child is added to a parent view.
parent
View
: the view in which a child was added
child
View
: the new child view added in the hierarchy
onChildViewRemoved
public void onChildViewRemoved (View p, View child)
This method is deprecated.
WebView no longer needs to implement
ViewGroup.OnHierarchyChangeListener. This method does nothing now.
Called when a child is removed from a parent view.
p
View
: the view from which the child was removed
child
View
: the child removed from the hierarchy
onCreateInputConnection
public InputConnection onCreateInputConnection (EditorInfo outAttrs)
Creates a new InputConnection for an InputMethod to interact with the WebView.
This is similar to View#onCreateInputConnection
but note that WebView
calls InputConnection methods on a thread other than the UI thread.
If these methods are overridden, then the overriding methods should respect
thread restrictions when calling View methods or accessing data.
outAttrs
EditorInfo
: Fill in with attribute information about the connection.
InputConnection
onCreateVirtualViewTranslationRequests
public void onCreateVirtualViewTranslationRequests (long[] virtualIds, int[] supportedFormats, Consumer<ViewTranslationRequest> requestsCollector)
Collects ViewTranslationRequest
s which represents the content to be translated
for the virtual views in the host view.
The default implementation does nothing.
virtualIds
long
: This value cannot be null
.
supportedFormats
int
: This value cannot be null
.
Value is TranslationSpec.DATA_FORMAT_TEXT
requestsCollector
Consumer
: This value cannot be null
.
void
This value may be null
.
onDragEvent
public boolean onDragEvent (DragEvent event)
Handles drag events sent by the system following a call to
startDragAndDrop()
.
When the system calls this method, it passes a
DragEvent
object. A call to
DragEvent.getAction()
returns one of the action type constants defined
in DragEvent. The method uses these to determine what is happening in the drag and drop
operation.
The default implementation returns false, except if an OnReceiveContentListener
is set
for this view. If an
OnReceiveContentListener
is set, the default implementation...
- returns true for an
ACTION_DRAG_STARTED
event - calls
performReceiveContent(ContentInfo)
for anACTION_DROP
event - returns true for an
ACTION_DROP
event, if the listener consumed some or all of the content
event
DragEvent
: The DragEvent
sent by the system.
The DragEvent.getAction()
method returns an action type constant defined
in DragEvent, indicating the type of drag event represented by this object.
boolean
true
if the method was successful, otherwise false
.
The method should return true
in response to an action type of
DragEvent.ACTION_DRAG_STARTED
to receive drag events for the current
operation.
The method should also return true
in response to an action type of
DragEvent.ACTION_DROP
if it consumed the drop, or
false
if it didn't.
For all other events, the return value is ignored.
onFinishTemporaryDetach
public void onFinishTemporaryDetach ()
Called after onStartTemporaryDetach()
when the container is done
changing the view.
onGenericMotionEvent
public boolean onGenericMotionEvent (MotionEvent event)
Implement this method to handle generic motion events.
Generic motion events describe joystick movements, mouse hovers, track pad
touches, scroll wheel movements and other input events. The
source
of the motion event specifies
the class of input that was received. Implementations of this method
must examine the bits in the source before processing the event.
The following code example shows how this is done.
Generic motion events with source class InputDevice#SOURCE_CLASS_POINTER
are delivered to the view under the pointer. All other generic motion events are
delivered to the focused view.
public boolean onGenericMotionEvent(MotionEvent event) { if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { if (event.getAction() == MotionEvent.ACTION_MOVE) { // process the joystick movement... return true; } } if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { switch (event.getAction()) { case MotionEvent.ACTION_HOVER_MOVE: // process the mouse hover movement... return true; case MotionEvent.ACTION_SCROLL: // process the scroll wheel movement... return true; } } return super.onGenericMotionEvent(event); }
event
MotionEvent
: The generic motion event being processed.
boolean
True if the event was handled, false otherwise.
onGlobalFocusChanged
public void onGlobalFocusChanged (View oldFocus, View newFocus)
This method is deprecated.
WebView should not have implemented
ViewTreeObserver.OnGlobalFocusChangeListener. This method does nothing now.
Callback method to be invoked when the focus changes in the view tree. When the view tree transitions from touch mode to non-touch mode, oldFocus is null. When the view tree transitions from non-touch mode to touch mode, newFocus is null. When focus changes in non-touch mode (without transition from or to touch mode) either oldFocus or newFocus can be null.
oldFocus
View
: The previously focused view, if any.
newFocus
View
: The newly focused View, if any.
onHoverEvent
public boolean onHoverEvent (MotionEvent event)
Implement this method to handle hover events.
This method is called whenever a pointer is hovering into, over, or out of the
bounds of a view and the view is not currently being touched.
Hover events are represented as pointer events with action
MotionEvent#ACTION_HOVER_ENTER
, MotionEvent#ACTION_HOVER_MOVE
,
or MotionEvent#ACTION_HOVER_EXIT
.
- The view receives a hover event with action
MotionEvent#ACTION_HOVER_ENTER
when the pointer enters the bounds of the view. - The view receives a hover event with action
MotionEvent#ACTION_HOVER_MOVE
when the pointer has already entered the bounds of the view and has moved. - The view receives a hover event with action
MotionEvent#ACTION_HOVER_EXIT
when the pointer has exited the bounds of the view or when the pointer is about to go down due to a button click, tap, or similar user action that causes the view to be touched.
The view should implement this method to return true to indicate that it is handling the hover event, such as by changing its drawable state.
The default implementation calls setHovered(boolean)
to update the hovered state
of the view when a hover enter or hover exit event is received, if the view
is enabled and is clickable. The default implementation also sends hover
accessibility events.
event
MotionEvent
: The motion event that describes the hover.
boolean
True if the view handled the hover event.
onKeyDown
public boolean onKeyDown (int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyDown()
: perform press of the view
when KeyEvent#KEYCODE_DPAD_CENTER
or KeyEvent#KEYCODE_ENTER
is released, if the view is enabled and clickable.
Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.
keyCode
int
: a key code that represents the button pressed, from
KeyEvent
event
KeyEvent
: the KeyEvent object that defines the button action
boolean
If you handled the event, return true. If you want to allow
the event to be handled by the next receiver, return false.
onKeyMultiple
public boolean onKeyMultiple (int keyCode, int repeatCount, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyMultiple()
: always returns false (doesn't handle
the event).
Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.
keyCode
int
: A key code that represents the button pressed, from
KeyEvent
.
repeatCount
int
: The number of times the action was made.
event
KeyEvent
: The KeyEvent object that defines the button action.
boolean
If you handled the event, return true. If you want to allow
the event to be handled by the next receiver, return false.
onKeyUp
public boolean onKeyUp (int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyUp()
: perform clicking of the view
when KeyEvent#KEYCODE_DPAD_CENTER
, KeyEvent#KEYCODE_ENTER
or KeyEvent#KEYCODE_SPACE
is released.
Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.
keyCode
int
: A key code that represents the button pressed, from
KeyEvent
.
event
KeyEvent
: The KeyEvent object that defines the button action.
boolean
If you handled the event, return true. If you want to allow
the event to be handled by the next receiver, return false.
onPause
public void onPause ()
Does a best-effort attempt to pause any processing that can be paused
safely, such as animations and geolocation. Note that this call
does not pause JavaScript. To pause JavaScript globally, use
pauseTimers()
.
To resume WebView, call onResume()
.
onProvideAutofillVirtualStructure
public void onProvideAutofillVirtualStructure (ViewStructure structure, int flags)
Populates a ViewStructure
containing virtual children to fullfil an autofill
request.
This method should be used when the view manages a virtual structure under this view. For
example, a view that draws input fields using draw(android.graphics.Canvas)
.
When implementing this method, subclasses must follow the rules below:
- Add virtual children by calling the
ViewStructure#newChild(int)
orViewStructure#asyncNewChild(int)
methods, where theid
is an unique id identifying the children in the virtual structure. - The children hierarchy can have multiple levels if necessary, but ideally it should exclude intermediate levels that are irrelevant for autofill; that would improve the autofill performance.
- Also implement
autofill(android.util.SparseArray)
to autofill the virtual children. - Set the autofill properties of the child structure as defined by
onProvideAutofillStructure(android.view.ViewStructure, int)
, usingViewStructure#setAutofillId(AutofillId, int)
to set its autofill id. - Call
AutofillManager.notifyViewEntered(View, int, Rect)
and/orAutofillManager.notifyViewExited(View, int)
when the focused virtual child changed. - Override
isVisibleToUserForAutofill(int)
to allow the platform to query whether a given virtual view is visible to the user in order to support triggering save when all views of interest go away. - Call
AutofillManager.notifyValueChanged(View, int, AutofillValue)
when the value of a virtual child changed. - Call
AutofillManager.notifyViewVisibilityChanged(View, int, boolean)
when the visibility of a virtual child changed. - Call
AutofillManager.notifyViewClicked(View, int)
when a virtual child is clicked. - Call
AutofillManager#commit()
when the autofill context of the view structure changed and the current context should be committed (for example, when the user tapped aSUBMIT
button in an HTML page). - Call
AutofillManager#cancel()
when the autofill context of the view structure changed and the current context should be canceled (for example, when the user tapped aCANCEL
button in an HTML page). - Provide ways for users to manually request autofill by calling
AutofillManager#requestAutofill(View, int, Rect)
. - The
left
andtop
values set inViewStructure#setDimens(int, int, int, int, int, int)
must be relative to the nextViewGroup#isImportantForAutofill()
predecessor view included in the structure.
Views with virtual children support the Autofill Framework mainly by:
- Providing the metadata defining what the virtual children mean and how they can be autofilled.
- Implementing the methods that autofill the virtual children.
This method is responsible for the former; autofill(android.util.SparseArray)
is responsible
for the latter.
The ViewStructure
traditionally represents a View
, while for web pages
it represent HTML nodes. Hence, it's necessary to "map" the HTML properties in a way that is
understood by the AutofillService
implementations:
- Only the HTML nodes inside a
FORM
are generated. - The source of the HTML is set using
ViewStructure#setWebDomain(String)
in the node representing the WebView. - If a web page has multiple
FORM
s, only the data for the current form is represented—if the user taps a field from another form, then the current autofill context is canceled (by callingAutofillManager.cancel()
and a new context is created for thatFORM
. - Similarly, if the page has
IFRAME
nodes, they are not initially represented in the view structure until the user taps a field from aFORM
inside theIFRAME
, in which case it would be treated the same way as multiple forms described above, except that theweb domain
of theFORM
contains thesrc
attribute from theIFRAME
node. - The W3C autofill field (
autocomplete
tag attribute) maps toViewStructure#setAutofillHints(String[])
. - If the view is editable, the
ViewStructure#setAutofillType(int)
andViewStructure#setAutofillValue(AutofillValue)
must be set. - The
placeholder
attribute maps toViewStructure#setHint(CharSequence)
. - Other HTML attributes can be represented through
ViewStructure#setHtmlInfo(android.view.ViewStructure.HtmlInfo)
.
If the WebView implementation can determine that the value of a field was set statically
(for example, not through Javascript), it should also call
structure.setDataIsSensitive(false)
.
For example, an HTML form with 2 fields for username and password:
<label>Username:</label>
<input type="text" name="username" id="user" value="Type your username" autocomplete="username" placeholder="Email or username">
<label>Password:</label>
<input type="password" name="password" id="pass" autocomplete="current-password" placeholder="Password">
Would map to:
int index = structure.addChildCount(2);
ViewStructure username = structure.newChild(index);
username.setAutofillId(structure.getAutofillId(), 1); // id 1 - first child
username.setAutofillHints("username");
username.setHtmlInfo(username.newHtmlInfoBuilder("input")
.addAttribute("type", "text")
.addAttribute("name", "username")
.addAttribute("label", "Username:")
.build());
username.setHint("Email or username");
username.setAutofillType(View.AUTOFILL_TYPE_TEXT);
username.setAutofillValue(AutofillValue.forText("Type your username"));
// Value of the field is not sensitive because it was created statically and not changed.
username.setDataIsSensitive(false);
ViewStructure password = structure.newChild(index + 1);
username.setAutofillId(structure, 2); // id 2 - second child
password.setAutofillHints("current-password");
password.setHtmlInfo(password.newHtmlInfoBuilder("input")
.addAttribute("type", "password")
.addAttribute("name", "password")
.addAttribute("label", "Password:")
.build());
password.setHint("Password");
password.setAutofillType(View.AUTOFILL_TYPE_TEXT);
structure
ViewStructure
: fill in with virtual children data for autofill purposes.
flags
int
: optional flags.
onProvideContentCaptureStructure
public void onProvideContentCaptureStructure (ViewStructure structure, int flags)
Populates a ViewStructure
for content capture.
This method is called after a view that is eligible for content capture
(for example, if it isImportantForContentCapture()
, an intelligence service is
enabled for the user, and the activity rendering the view is enabled for content capture)
is laid out and is visible. The populated structure is then passed to the service through
ContentCaptureSession#notifyViewAppeared(ViewStructure)
.
The default implementation of this method sets the most relevant properties based on
related View
methods, and views in the standard Android widgets library also
override it to set their relevant properties. Therefore, if overriding this method, it
is recommended to call super.onProvideContentCaptureStructure()
.
Note: views that manage a virtual structure under this view must populate just
the node representing this view and return right away, then asynchronously report (not
necessarily in the UI thread) when the children nodes appear, disappear or have their text
changed by calling
ContentCaptureSession#notifyViewAppeared(ViewStructure)
,
ContentCaptureSession#notifyViewDisappeared(AutofillId)
, and
ContentCaptureSession#notifyViewTextChanged(AutofillId, CharSequence)
respectively. The structure for a child must be created using
ContentCaptureSession#newVirtualViewStructure(AutofillId, long)
, and the
autofillId
for a child can be obtained either through
childStructure.getAutofillId()
or
ContentCaptureSession#newAutofillId(AutofillId, long)
.
When the virtual view hierarchy represents a web page, you should also:
- Call
ContentCaptureManager#getContentCaptureConditions()
to infer content capture events should be generate for that URL. - Create a new
ContentCaptureSession
child for every HTML element that renders a new URL (like anIFRAME
) and use that session to notify events from that subtree.
Note: the following methods of the structure
will be ignored:
structure
ViewStructure
: This value cannot be null
.
flags
int
onProvideVirtualStructure
public void onProvideVirtualStructure (ViewStructure structure)
Called when assist structure is being retrieved from a view as part of
Activity.onProvideAssistData
to
generate additional virtual structure under this view. The default implementation
uses getAccessibilityNodeProvider()
to try to generate this from the
view's virtual accessibility nodes, if any. You can override this for a more
optimal implementation providing this data.
structure
ViewStructure
onStartTemporaryDetach
public void onStartTemporaryDetach ()
This is called when a container is going to temporarily detach a child, with
ViewGroup.detachViewFromParent
.
It will either be followed by onFinishTemporaryDetach()
or
onDetachedFromWindow()
when the container is done.
onTouchEvent
public boolean onTouchEvent (MotionEvent event)
Implement this method to handle touch screen motion events.
If this method is used to detect click actions, it is recommended that
the actions be performed by implementing and calling
performClick()
. This will ensure consistent system behavior,
including:
- obeying click sound preferences
- dispatching OnClickListener calls
- handling
ACTION_CLICK
when accessibility features are enabled
event
MotionEvent
: The motion event.
boolean
True if the event was handled, false otherwise.
onTrackballEvent
public boolean onTrackballEvent (MotionEvent event)
Implement this method to handle trackball motion events. The
relative movement of the trackball since the last event
can be retrieve with MotionEvent.getX()
and
MotionEvent.getY()
. These are normalized so
that a movement of 1 corresponds to the user pressing one DPAD key (so
they will often be fractional values, representing the more fine-grained
movement information available from a trackball).
event
MotionEvent
: The motion event.
boolean
True if the event was handled, false otherwise.
onVirtualViewTranslationResponses
public void onVirtualViewTranslationResponses (LongSparseArray<ViewTranslationResponse> response)
Called when the content from View#onCreateVirtualViewTranslationRequests
had been
translated by the TranslationService.
The default implementation does nothing.
response
LongSparseArray
: This value cannot be null
.
onWindowFocusChanged
public void onWindowFocusChanged (boolean hasWindowFocus)
Called when the window containing this view gains or loses focus. Note that this is separate from view focus: to receive key events, both your view and its window must have focus. If a window is displayed on top of yours that takes input focus, then your own window will lose focus but the view focus will remain unchanged.
hasWindowFocus
boolean
: True if the window containing this view now has
focus, false otherwise.
overlayHorizontalScrollbar
public boolean overlayHorizontalScrollbar ()
This method was deprecated
in API level 23.
This method is now obsolete.
Gets whether horizontal scrollbar has overlay style.
boolean
true
overlayVerticalScrollbar
public boolean overlayVerticalScrollbar ()
This method was deprecated
in API level 23.
This method is now obsolete.
Gets whether vertical scrollbar has overlay style.
boolean
false
pageDown
public boolean pageDown (boolean bottom)
Scrolls the contents of this WebView down by half the page size.
bottom
boolean
: true
to jump to bottom of page
boolean
true
if the page was scrolled
pageUp
public boolean pageUp (boolean top)
Scrolls the contents of this WebView up by half the view size.
top
boolean
: true
to jump to the top of the page
boolean
true
if the page was scrolled
pauseTimers
public void pauseTimers ()
Pauses all layout, parsing, and JavaScript timers for all WebViews. This is a global requests, not restricted to just this WebView. This can be useful if the application has been paused.
performLongClick
public boolean performLongClick ()
Calls this view's OnLongClickListener, if it is defined. Invokes the context menu if the OnLongClickListener did not consume the event.
boolean
true
if one of the above receivers consumed the event,
false
otherwise
postUrl
public void postUrl (String url, byte[] postData)
Loads the URL with postData using "POST" method into this WebView. If url
is not a network URL, it will be loaded with loadUrl(java.lang.String)
instead, ignoring the postData param.
url
String
: the URL of the resource to load
This value cannot be null
.
postData
byte
: the data will be passed to "POST" request, which must be
be "application/x-www-form-urlencoded" encoded.
This value cannot be null
.
postVisualStateCallback
public void postVisualStateCallback (long requestId, WebView.VisualStateCallback callback)
Posts a VisualStateCallback
, which will be called when
the current state of the WebView is ready to be drawn.
Because updates to the DOM are processed asynchronously, updates to the DOM may not
immediately be reflected visually by subsequent WebView#onDraw
invocations. The
VisualStateCallback
provides a mechanism to notify the caller when the contents of
the DOM at the current time are ready to be drawn the next time the WebView
draws.
The next draw after the callback completes is guaranteed to reflect all the updates to the
DOM up to the point at which the VisualStateCallback
was posted, but it may also
contain updates applied after the callback was posted.
The state of the DOM covered by this API includes the following:
- primitive HTML elements (div, img, span, etc..)
- images
- CSS animations
- WebGL
- canvas
- the video tag
To guarantee that the WebView
will successfully render the first frame
after the VisualStateCallback#onComplete
method has been called a set of conditions
must be met:
- If the
WebView
's visibility is set toVISIBLE
then theWebView
must be attached to the view hierarchy. - If the
WebView
's visibility is set toINVISIBLE
then theWebView
must be attached to the view hierarchy and must be madeVISIBLE
from theVisualStateCallback#onComplete
method. - If the
WebView
's visibility is set toGONE
then theWebView
must be attached to the view hierarchy and itsLayoutParams
's width and height need to be set to fixed values and must be madeVISIBLE
from theVisualStateCallback#onComplete
method.
When using this API it is also recommended to enable pre-rasterization if the WebView
is off screen to avoid flickering. See WebSettings#setOffscreenPreRaster
for
more details and do consider its caveats.
requestId
long
: An id that will be returned in the callback to allow callers to match
requests with callbacks.
callback
WebView.VisualStateCallback
: The callback to be invoked.
This value cannot be null
.
postWebMessage
public void postWebMessage (WebMessage message, Uri targetOrigin)
Post a message to main frame. The embedded application can restrict the messages to a certain target origin. See HTML5 spec for how target origin can be used.
A target origin can be set as a wildcard ("*"). However this is not recommended. See the page above for security issues.
Content loaded via loadData(java.lang.String, java.lang.String, java.lang.String)
will not have a
valid origin, and thus cannot be sent messages securely. If you need to send
messages using this function, you should use
loadDataWithBaseURL(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)
with a valid
HTTP or HTTPS baseUrl
to define a valid origin that can be used for
messaging.
message
WebMessage
: the WebMessage
This value cannot be null
.
targetOrigin
Uri
: the target origin.
This value cannot be null
.
reload
public void reload ()
Reloads the current URL.
removeJavascriptInterface
public void removeJavascriptInterface (String name)
Removes a previously injected Java object from this WebView. Note that
the removal will not be reflected in JavaScript until the page is next
(re)loaded. See addJavascriptInterface(Object, String)
.
name
String
: the name used to expose the object in JavaScript
This value cannot be null
.
requestChildRectangleOnScreen
public boolean requestChildRectangleOnScreen (View child, Rect rect, boolean immediate)
Called when a child of this group wants a particular rectangle to be
positioned onto the screen. ViewGroup
s overriding this can trust
that:
- child will be a direct child of this group
- rectangle will be in the child's content coordinates
ViewGroup
s overriding this should uphold the contract:
- nothing will change if the rectangle is already visible
- the view port will be scrolled only just enough to make the rectangle visible
child
View
: The direct child making the request.
rect
Rect
: The rectangle in the child's coordinates the child
wishes to be on the screen.
immediate
boolean
: True to forbid animated or delayed scrolling,
false otherwise
boolean
Whether the group scrolled to handle the operation
requestFocus
public boolean requestFocus (int direction, Rect previouslyFocusedRect)
Call this to try to give focus to a specific view or to one of its descendants and give it hints about the direction and a specific rectangle that the focus is coming from. The rectangle can help give larger views a finer grained hint about where focus is coming from, and therefore, where to show selection, or forward focus change internally.
A view will not actually take focus if it is not focusable (isFocusable()
returns
false), or if it is focusable and it is not focusable in touch mode
(isFocusableInTouchMode()
) while the device is in touch mode.
A View will not take focus if it is not visible.
A View will not take focus if one of its parents has
ViewGroup.getDescendantFocusability()
equal to
ViewGroup#FOCUS_BLOCK_DESCENDANTS
.
See also focusSearch(int)
, which is what you call to say that you
have focus, and you want your parent to look for the next one.
You may wish to override this method if your custom View
has an internal
View
that it wishes to forward the request to.
Looks for a view to give focus to respecting the setting specified by
getDescendantFocusability()
.
Uses onRequestFocusInDescendants(int, android.graphics.Rect)
to
find focus within the children of this group when appropriate.
direction
int
: One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
previouslyFocusedRect
Rect
: The rectangle (in this View's coordinate system)
to give a finer grained hint about where focus is coming from. May be null
if there is no hint.
boolean
Whether this view or one of its descendants actually took focus.
requestFocusNodeHref
public void requestFocusNodeHref (Message hrefMsg)
Requests the anchor or image element URL at the last tapped point.
If hrefMsg is null
, this method returns immediately and does not
dispatch hrefMsg to its target. If the tapped point hits an image,
an anchor, or an image in an anchor, the message associates
strings in named keys in its data. The value paired with the key
may be an empty string.
hrefMsg
Message
: the message to be dispatched with the result of the
request. The message data contains three keys. "url"
returns the anchor's href attribute. "title" returns the
anchor's text. "src" returns the image's src attribute.
This value may be null
.
requestImageRef
public void requestImageRef (Message msg)
Requests the URL of the image last touched by the user. msg will be sent to its target with a String representing the URL as its object.
msg
Message
: the message to be dispatched with the result of the request
as the data member with "url" as key. The result can be null
.
This value cannot be null
.
restoreState
public WebBackForwardList restoreState (Bundle inState)
Restores the state of this WebView from the given Bundle. This method is
intended for use in Activity.onRestoreInstanceState(Bundle)
and should be called to restore the state of this WebView. If
it is called after this WebView has had a chance to build state (load
pages, create a back/forward list, etc.) there may be undesirable
side-effects. Please note that this method no longer restores the
display data for this WebView.
inState
Bundle
: the incoming Bundle of state
This value cannot be null
.
WebBackForwardList
the restored back/forward list or null
if restoreState failed
resumeTimers
public void resumeTimers ()
Resumes all layout, parsing, and JavaScript timers for all WebViews. This will resume dispatching all timers.
savePassword
public void savePassword (String host, String username, String password)
This method was deprecated
in API level 18.
Saving passwords in WebView will not be supported in future versions.
Sets a username and password pair for the specified host. This data is used by the WebView to autocomplete username and password fields in web forms. Note that this is unrelated to the credentials used for HTTP authentication.
host
String
: the host that required the credentials
username
String
: the username for the given host
password
String
: the password for the given host
saveState
public WebBackForwardList saveState (Bundle outState)
Saves the state of this WebView used in
Activity.onSaveInstanceState(Bundle)
. Please note that this
method no longer stores the display data for this WebView. The previous
behavior could potentially leak files if restoreState(Bundle)
was never
called.
outState
Bundle
: the Bundle to store this WebView's state
This value cannot be null
.
WebBackForwardList
the same copy of the back/forward list used to save the state, null
if the
method fails.
saveWebArchive
public void saveWebArchive (String filename)
Saves the current view as a web archive.
filename
String
: the filename where the archive should be placed
This value cannot be null
.
saveWebArchive
public void saveWebArchive (String basename, boolean autoname, ValueCallback<String> callback)
Saves the current view as a web archive.
basename
String
: the filename where the archive should be placed
This value cannot be null
.
autoname
boolean
: if false
, takes basename to be a file. If true
, basename
is assumed to be a directory in which a filename will be
chosen according to the URL of the current page.
callback
ValueCallback
: called after the web archive has been saved. The
parameter for onReceiveValue will either be the filename
under which the file was saved, or null
if saving the
file failed.
This value may be null
.
setBackgroundColor
public void setBackgroundColor (int color)
Sets the background color for this view.
color
int
: the color of the background
setCertificate
public void setCertificate (SslCertificate certificate)
This method was deprecated
in API level 17.
Calling this function has no useful effect, and will be
ignored in future releases.
Sets the SSL certificate for the main top-level page.
certificate
SslCertificate
setDataDirectorySuffix
public static void setDataDirectorySuffix (String suffix)
Define the directory used to store WebView data for the current process. The provided suffix will be used when constructing data and cache directory paths. If this API is not called, no suffix will be used. Each directory can be used by only one process in the application. If more than one process in an app wishes to use WebView, only one process can use the default directory, and other processes must call this API to define a unique suffix.
This means that different processes in the same application cannot directly
share WebView-related data, since the data directories must be distinct.
Applications that use this API may have to explicitly pass data between
processes. For example, login cookies may have to be copied from one
process's cookie jar to the other using CookieManager
if both
processes' WebViews are intended to be logged in.
Most applications should simply ensure that all components of the app
that rely on WebView are in the same process, to avoid needing multiple
data directories. The disableWebView()
method can be used to ensure
that the other processes do not use WebView by accident in this case.
This API must be called before any instances of WebView are created in this process and before any other methods in the android.webkit package are called by this process.
suffix
String
: The directory name suffix to be used for the current
process. Must not contain a path separator.
This value cannot be null
.
IllegalStateException
if WebView has already been initialized
in the current process.
IllegalArgumentException
if the suffix contains a path separator.
setDownloadListener
public void setDownloadListener (DownloadListener listener)
Registers the interface to be used when content can not be handled by the rendering engine, and should be downloaded instead. This will replace the current handler.
listener
DownloadListener
: an implementation of DownloadListener
This value may be null
.
setFindListener
public void setFindListener (WebView.FindListener listener)
Registers the listener to be notified as find-on-page operations progress. This will replace the current listener.
setHorizontalScrollbarOverlay
public void setHorizontalScrollbarOverlay (boolean overlay)
This method was deprecated
in API level 23.
This method has no effect.
Specifies whether the horizontal scrollbar has overlay style.
overlay
boolean
: true
if horizontal scrollbar should have overlay style
setHttpAuthUsernamePassword
public void setHttpAuthUsernamePassword (String host, String realm, String username, String password)
This method was deprecated
in API level 26.
Use WebViewDatabase#setHttpAuthUsernamePassword
instead
Stores HTTP authentication credentials for a given host and realm to the WebViewDatabase
instance.
host
String
: the host to which the credentials apply
realm
String
: the realm to which the credentials apply
username
String
: the username
password
String
: the password
setInitialScale
public void setInitialScale (int scaleInPercent)
Sets the initial scale for this WebView. 0 means default.
The behavior for the default scale depends on the state of
WebSettings#getUseWideViewPort()
and
WebSettings#getLoadWithOverviewMode()
.
If the content fits into the WebView control by width, then
the zoom is set to 100%. For wide content, the behavior
depends on the state of WebSettings#getLoadWithOverviewMode()
.
If its value is true
, the content will be zoomed out to be fit
by width into the WebView control, otherwise not.
If initial scale is greater than 0, WebView starts with this value as initial scale. Please note that unlike the scale properties in the viewport meta tag, this method doesn't take the screen density into account.
scaleInPercent
int
: the initial scale in percent
setLayerType
public void setLayerType (int layerType, Paint paint)
Specifies the type of layer backing this view. The layer can be
LAYER_TYPE_NONE
, LAYER_TYPE_SOFTWARE
or
LAYER_TYPE_HARDWARE
.
A layer is associated with an optional Paint
instance that controls how the layer is composed on screen. The following
properties of the paint are taken into account when composing the layer:
If this view has an alpha value set to < 1.0 by calling
setAlpha(float)
, the alpha value of the layer's paint is superseded
by this view's alpha value.
Refer to the documentation of LAYER_TYPE_NONE
,
LAYER_TYPE_SOFTWARE
and LAYER_TYPE_HARDWARE
for more information on when and how to use layers.
ParameterslayerType
int
: The type of layer to use with this view, must be one of
View.LAYER_TYPE_NONE
, View.LAYER_TYPE_SOFTWARE
or
View.LAYER_TYPE_HARDWARE
Value is View.LAYER_TYPE_NONE
, View.LAYER_TYPE_SOFTWARE
, or View.LAYER_TYPE_HARDWARE
paint
Paint
: The paint used to compose the layer. This argument is optional
and can be null. It is ignored when the layer type is
View.LAYER_TYPE_NONE
This value may be null
.
setLayoutParams
public void setLayoutParams (ViewGroup.LayoutParams params)
Set the layout parameters associated with this view. These supply parameters to the parent of this view specifying how it should be arranged. There are many subclasses of ViewGroup.LayoutParams, and these correspond to the different subclasses of ViewGroup that are responsible for arranging their children.
params
ViewGroup.LayoutParams
: The layout parameters for this view, cannot be null
setMapTrackballToArrowKeys
public void setMapTrackballToArrowKeys (boolean setMap)
This method was deprecated
in API level 17.
Only the default case, true
, will be supported in a future version.
setMap
boolean
setNetworkAvailable
public void setNetworkAvailable (boolean networkUp)
Informs WebView of the network state. This is used to set the JavaScript property window.navigator.isOnline and generates the online/offline event as specified in HTML5, sec. 5.7.7
networkUp
boolean
: a boolean indicating if network is available
setOverScrollMode
public void setOverScrollMode (int mode)
Set the over-scroll mode for this view. Valid over-scroll modes are
OVER_SCROLL_ALWAYS
, OVER_SCROLL_IF_CONTENT_SCROLLS
(allow over-scrolling only if the view content is larger than the container),
or OVER_SCROLL_NEVER
.
Setting the over-scroll mode of a view will have an effect only if the view is capable of scrolling.
mode
int
: The new over-scroll mode for this view.
setPictureListener
public void setPictureListener (WebView.PictureListener listener)
This method was deprecated
in API level 15.
This method is now obsolete.
Sets the Picture listener. This is an interface used to receive notifications of a new Picture.
listener
WebView.PictureListener
: an implementation of WebView.PictureListener
setRendererPriorityPolicy
public void setRendererPriorityPolicy (int rendererRequestedPriority, boolean waivedWhenNotVisible)
Set the renderer priority policy for this WebView
. The
priority policy will be used to determine whether an out of
process renderer should be considered to be a target for OOM
killing.
Because a renderer can be associated with more than one
WebView, the final priority it is computed as the maximum of
any attached WebViews. When a WebView is destroyed it will
cease to be considerered when calculating the renderer
priority. Once no WebViews remain associated with the renderer,
the priority of the renderer will be reduced to
RENDERER_PRIORITY_WAIVED
.
The default policy is to set the priority to
RENDERER_PRIORITY_IMPORTANT
regardless of visibility,
and this should not be changed unless the caller also handles
renderer crashes with
WebViewClient#onRenderProcessGone
. Any other setting
will result in WebView renderers being killed by the system
more aggressively than the application.
rendererRequestedPriority
int
: the minimum priority at which
this WebView desires the renderer process to be bound.
Value is RENDERER_PRIORITY_WAIVED
, RENDERER_PRIORITY_BOUND
, or RENDERER_PRIORITY_IMPORTANT
waivedWhenNotVisible
boolean
: if true
, this flag specifies that
when this WebView is not visible, it will be treated as
if it had requested a priority of
RENDERER_PRIORITY_WAIVED
.
setSafeBrowsingWhitelist
public static void setSafeBrowsingWhitelist (List<String> hosts, ValueCallback<Boolean> callback)
Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks. The list is global for all the WebViews.
Each rule should take one of these:
All other rules, including wildcards, are invalid.
The correct syntax for hosts is defined by RFC 3986.
hosts
List
: the list of hosts
This value cannot be null
.
callback
ValueCallback
: will be called with true
if hosts are successfully added to the
allowlist. It will be called with false
if any hosts are malformed. The callback
will be run on the UI thread
This value may be null
.
setScrollBarStyle
public void setScrollBarStyle (int style)
Specify the style of the scrollbars. The scrollbars can be overlaid or inset. When inset, they add to the padding of the view. And the scrollbars can be drawn inside the padding area or on the edge of the view. For example, if a view has a background drawable and you want to draw the scrollbars inside the padding specified by the drawable, you can use SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to appear at the edge of the view, ignoring the padding, then you can use SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
style
int
: the style of the scrollbars. Should be one of
SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET,
SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
Value is View.SCROLLBARS_INSIDE_OVERLAY
, View.SCROLLBARS_INSIDE_INSET
, View.SCROLLBARS_OUTSIDE_OVERLAY
, or View.SCROLLBARS_OUTSIDE_INSET
setTextClassifier
public void setTextClassifier (TextClassifier textClassifier)
Sets the TextClassifier
for this WebView.
textClassifier
TextClassifier
: This value may be null
.
setVerticalScrollbarOverlay
public void setVerticalScrollbarOverlay (boolean overlay)
This method was deprecated
in API level 23.
This method has no effect.
Specifies whether the vertical scrollbar has overlay style.
overlay
boolean
: true
if vertical scrollbar should have overlay style
setWebChromeClient
public void setWebChromeClient (WebChromeClient client)
Sets the chrome handler. This is an implementation of WebChromeClient for use in handling JavaScript dialogs, favicons, titles, and the progress. This will replace the current handler.
client
WebChromeClient
: an implementation of WebChromeClient
This value may be null
.
See also:
setWebContentsDebuggingEnabled
public static void setWebContentsDebuggingEnabled (boolean enabled)
Enables debugging of web contents (HTML / CSS / JavaScript) loaded into any WebViews of this application. This flag can be enabled in order to facilitate debugging of web layouts and JavaScript code running inside WebViews. Please refer to WebView documentation for the debugging guide.
The default is false
.
enabled
boolean
: whether to enable web contents debugging
setWebViewClient
public void setWebViewClient (WebViewClient client)
Sets the WebViewClient that will receive various notifications and requests. This will replace the current handler.
client
WebViewClient
: an implementation of WebViewClient
This value cannot be null
.
See also:
setWebViewRenderProcessClient
public void setWebViewRenderProcessClient (Executor executor, WebViewRenderProcessClient webViewRenderProcessClient)
Sets the renderer client object associated with this WebView.
The renderer client encapsulates callbacks relevant to WebView renderer
state. See WebViewRenderProcessClient
for details.
Although many WebView instances may share a single underlying
renderer, and renderers may live either in the application
process, or in a sandboxed process that is isolated from the
application process, instances of WebViewRenderProcessClient
are set per-WebView. Callbacks represent renderer events from
the perspective of this WebView, and may or may not be correlated
with renderer events affecting other WebViews.
executor
Executor
: the Executor on which WebViewRenderProcessClient
callbacks will execute.
This value cannot be null
.
Callback and listener events are dispatched through this
Executor
, providing an easy way to control which thread is
used. To dispatch events through the main thread of your
application, you can use
Context.getMainExecutor()
.
To dispatch events through a shared thread pool, you can use
AsyncTask#THREAD_POOL_EXECUTOR
.
webViewRenderProcessClient
WebViewRenderProcessClient
: the WebViewRenderProcessClient
object.
This value cannot be null
.
setWebViewRenderProcessClient
public void setWebViewRenderProcessClient (WebViewRenderProcessClient webViewRenderProcessClient)
Sets the renderer client object associated with this WebView.
See setWebViewRenderProcessClient(java.util.concurrent.Executor, android.webkit.WebViewRenderProcessClient)
for details.
WebViewRenderProcessClient
callbacks will run on the thread that this WebView was
initialized on.
webViewRenderProcessClient
WebViewRenderProcessClient
: the WebViewRenderProcessClient
object.
This value may be null
.
shouldDelayChildPressedState
public boolean shouldDelayChildPressedState ()
Return true if the pressed state should be delayed for children or descendants of this ViewGroup. Generally, this should be done for containers that can scroll, such as a List. This prevents the pressed state from appearing when the user is actually trying to scroll the content.
The default implementation returns true for compatibility reasons. Subclasses that do not scroll should generally override this method and return false.
boolean
showFindDialog
public boolean showFindDialog (String text, boolean showIme)
This method was deprecated
in API level 18.
This method does not work reliably on all Android versions;
implementing a custom find dialog using WebView.findAllAsync()
provides a more robust solution.
Starts an ActionMode for finding text in this WebView. Only works if this WebView is attached to the view system.
text
String
: if non-null, will be the initial text to search for.
Otherwise, the last String searched for in this WebView will
be used to start.
This value may be null
.
showIme
boolean
: if true
, show the IME, assuming the user will begin typing.
If false
and text is non-null, perform a find all.
boolean
true
if the find dialog is shown, false
otherwise
startSafeBrowsing
public static void startSafeBrowsing (Context context, ValueCallback<Boolean> callback)
Starts Safe Browsing initialization.
URL loads are not guaranteed to be protected by Safe Browsing until after callback
is
invoked with true
. Safe Browsing is not fully supported on all devices. For those
devices callback
will receive false
.
This should not be called if Safe Browsing has been disabled by manifest tag or WebSettings.setSafeBrowsingEnabled(boolean)
. This prepares resources used for Safe Browsing.
This should be called with the Application Context (and will always use the Application context to do its work regardless).
context
Context
: Application Context.
This value cannot be null
.
callback
ValueCallback
: will be called on the UI thread with true
if initialization is
successful, false
otherwise.
This value may be null
.
stopLoading
public void stopLoading ()
Stops the current load.
zoomBy
public void zoomBy (float zoomFactor)
Performs a zoom operation in this WebView.
zoomFactor
float
: the zoom factor to apply. The zoom factor will be clamped to the WebView's
zoom limits. This value must be in the range 0.01 to 100.0 inclusive.
zoomIn
public boolean zoomIn ()
Performs zoom in in this WebView.
boolean
true
if zoom in succeeds, false
if no zoom changes
zoomOut
public boolean zoomOut ()
Performs zoom out in this WebView.
boolean
true
if zoom out succeeds, false
if no zoom changes
Protected methods
computeHorizontalScrollOffset
protected int computeHorizontalScrollOffset ()
Compute the horizontal offset of the horizontal scrollbar's thumb within the horizontal range. This value is used to compute the position of the thumb within the scrollbar's track.
The range is expressed in arbitrary units that must be the same as the
units used by computeHorizontalScrollRange()
and
computeHorizontalScrollExtent()
.
The default offset is the scroll offset of this view.
int
the horizontal offset of the scrollbar's thumb
computeHorizontalScrollRange
protected int computeHorizontalScrollRange ()
Compute the horizontal range that the horizontal scrollbar represents.
The range is expressed in arbitrary units that must be the same as the
units used by computeHorizontalScrollExtent()
and
computeHorizontalScrollOffset()
.
The default range is the drawing width of this view.
int
the total horizontal range represented by the horizontal
scrollbar
computeVerticalScrollExtent
protected int computeVerticalScrollExtent ()
Compute the vertical extent of the vertical scrollbar's thumb within the vertical range. This value is used to compute the length of the thumb within the scrollbar's track.
The range is expressed in arbitrary units that must be the same as the
units used by computeVerticalScrollRange()
and
computeVerticalScrollOffset()
.
The default extent is the drawing height of this view.
int
the vertical extent of the scrollbar's thumb
computeVerticalScrollOffset
protected int computeVerticalScrollOffset ()
Compute the vertical offset of the vertical scrollbar's thumb within the horizontal range. This value is used to compute the position of the thumb within the scrollbar's track.
The range is expressed in arbitrary units that must be the same as the
units used by computeVerticalScrollRange()
and
computeVerticalScrollExtent()
.
The default offset is the scroll offset of this view.
int
the vertical offset of the scrollbar's thumb
computeVerticalScrollRange
protected int computeVerticalScrollRange ()
Compute the vertical range that the vertical scrollbar represents.
The range is expressed in arbitrary units that must be the same as the
units used by computeVerticalScrollExtent()
and
computeVerticalScrollOffset()
.
Returnsint
the total vertical range represented by the vertical scrollbar
The default range is the drawing height of this view.
dispatchDraw
protected void dispatchDraw (Canvas canvas)
Called by draw to draw the child views. This may be overridden by derived classes to gain control just before its children are drawn (but after its own view has been drawn).
canvas
Canvas
: the canvas on which to draw the view
onAttachedToWindow
protected void onAttachedToWindow ()
This is called when the view is attached to a window. At this point it
has a Surface and will start drawing. Note that this function is
guaranteed to be called before onDraw(android.graphics.Canvas)
,
however it may be called any time before the first onDraw -- including
before or after onMeasure(int, int)
.
If you override this method you must call through to the
superclass implementation.
onConfigurationChanged
protected void onConfigurationChanged (Configuration newConfig)
Called when the current configuration of the resources being used
by the application have changed. You can use this to decide when
to reload resources that can changed based on orientation and other
configuration characteristics. You only need to use this if you are
not relying on the normal Activity
mechanism of
recreating the activity instance upon a configuration change.
newConfig
Configuration
: The new resource configuration.
onDraw
protected void onDraw (Canvas canvas)
Implement this to do your drawing.
canvas
Canvas
: the canvas on which the background will be drawn
onFocusChanged
protected void onFocusChanged (boolean focused, int direction, Rect previouslyFocusedRect)
Called by the view system when the focus state of this view changes. When the focus change event is caused by directional navigation, direction and previouslyFocusedRect provide insight into where the focus is coming from. When overriding, be sure to call up through to the super class so that the standard focus handling will occur.
If you override this method you must call through to the
superclass implementation.
focused
boolean
: True if the View has focus; false otherwise.
direction
int
: The direction focus has moved when requestFocus()
is called to give this view focus. Values are
View.FOCUS_UP
, View.FOCUS_DOWN
, View.FOCUS_LEFT
,
View.FOCUS_RIGHT
, View.FOCUS_FORWARD
, or View.FOCUS_BACKWARD
.
It may not always apply, in which case use the default.
Value is View.FOCUS_BACKWARD
, View.FOCUS_FORWARD
, View.FOCUS_LEFT
, View.FOCUS_UP
, View.FOCUS_RIGHT
, or View.FOCUS_DOWN
previouslyFocusedRect
Rect
: The rectangle, in this view's coordinate
system, of the previously focused view. If applicable, this will be
passed in as finer grained information about where the focus is coming
from (in addition to direction). Will be null
otherwise.
This value may be null
.
onMeasure
protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
Measure the view and its content to determine the measured width and the
measured height. This method is invoked by measure(int, int)
and
should be overridden by subclasses to provide accurate and efficient
measurement of their contents.
CONTRACT: When overriding this method, you
must call setMeasuredDimension(int, int)
to store the
measured width and height of this view. Failure to do so will trigger an
IllegalStateException
, thrown by
measure(int, int)
. Calling the superclass'
onMeasure(int, int)
is a valid use.
The base class implementation of measure defaults to the background size,
unless a larger size is allowed by the MeasureSpec. Subclasses should
override onMeasure(int, int)
to provide better measurements of
their content.
If this method is overridden, it is the subclass's responsibility to make
sure the measured height and width are at least the view's minimum height
and width (getSuggestedMinimumHeight()
and
getSuggestedMinimumWidth()
).
widthMeasureSpec
int
: horizontal space requirements as imposed by the parent.
The requirements are encoded with
View.MeasureSpec
.
heightMeasureSpec
int
: vertical space requirements as imposed by the parent.
The requirements are encoded with
View.MeasureSpec
.
onOverScrolled
protected void onOverScrolled (int scrollX, int scrollY, boolean clampedX, boolean clampedY)
Called by overScrollBy(int, int, int, int, int, int, int, int, boolean)
to
respond to the results of an over-scroll operation.
scrollX
int
: New X scroll value in pixels
scrollY
int
: New Y scroll value in pixels
clampedX
boolean
: True if scrollX was clamped to an over-scroll boundary
clampedY
boolean
: True if scrollY was clamped to an over-scroll boundary
onScrollChanged
protected void onScrollChanged (int l, int t, int oldl, int oldt)
This is called in response to an internal scroll in this view (i.e., the
view scrolled its own contents). This is typically as a result of
scrollBy(int, int)
or scrollTo(int, int)
having been
called.
l
int
: Current horizontal scroll origin.
t
int
: Current vertical scroll origin.
oldl
int
: Previous horizontal scroll origin.
oldt
int
: Previous vertical scroll origin.
onSizeChanged
protected void onSizeChanged (int w, int h, int ow, int oh)
This is called during layout when the size of this view has changed. If you were just added to the view hierarchy, you're called with the old values of 0.
w
int
: Current width of this view.
h
int
: Current height of this view.
ow
int
: Old width of this view.
oh
int
: Old height of this view.
onVisibilityChanged
protected void onVisibilityChanged (View changedView, int visibility)
Called when the visibility of the view or an ancestor of the view has changed.
changedView
View
: The view whose visibility changed. May be
this
or an ancestor view.
This value cannot be null
.
visibility
int
: The new visibility, one of View.VISIBLE
,
View.INVISIBLE
or View.GONE
.
Value is View.VISIBLE
, View.INVISIBLE
, or View.GONE
onWindowVisibilityChanged
protected void onWindowVisibilityChanged (int visibility)
Called when the window containing has change its visibility
(between GONE
, INVISIBLE
, and VISIBLE
). Note
that this tells you whether or not your window is being made visible
to the window manager; this does not tell you whether or not
your window is obscured by other windows on the screen, even if it
is itself visible.
visibility
int
: The new visibility of the window.
Value is View.VISIBLE
, View.INVISIBLE
, or View.GONE
Content and code samples on this page are subject to the licenses described in the Content License. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2021-07-14 UTC.
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