Webview资源请求的拦截

 /**
 * Give the host application a chance to take over the control when a new
 * url is about to be loaded in the current WebView. If WebViewClient is not
 * provided, by default WebView will ask Activity Manager to choose the
 * proper handler for the url. If WebViewClient is provided, return true
 * means the host application handles the url, while return false means the
 * current WebView handles the url.
 * This method is not called for requests using the POST "method".
 *
 * @param view The WebView that is initiating the callback.
 * @param url The url to be loaded.
 * @return True if the host application wants to leave the current WebView
 *         and handle the url itself, otherwise return false.
 */
public boolean shouldOverrideUrlLoading(WebView view, String url) {
    return false;
}

public WebResourceResponse shouldInterceptRequest(WebView view, String url)  

public WebResourceResponse shouldInterceptRequest(WebView view, final WebResourceRequest request) 

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, final WebResourceRequest request) {
        Uri uri = request.getUrl();
        if (uri != null) {
            WebResourceResponse response = getWebResourceResponse(uri.toString());
            if (response != null) return response;
        }

        return super.shouldInterceptRequest(view, request);
    }

    @Nullable
    private WebResourceResponse getWebResourceResponse(String url) {
        try {
            if (url != null && url.contains("kaide.com")) {
                URL newUrl = new URL(appendDeviceInfo(url));
                URLConnection connection = newUrl.openConnection();
                return new WebResourceResponse(connection.getContentType(), connection.getHeaderField("encoding"), connection.getInputStream());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
        WebResourceResponse response = getWebResourceResponse(url);
        if (response != null) return response;
        return super.shouldInterceptRequest(view, url);
    }