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安卓渲染Html 并做分页,你学会了吗?

 11 months ago
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安卓渲染Html 并做分页,你学会了吗?

作者:Clover幸运之星 2023-06-05 08:29:46
我们使用WebView加载了一个简单的HTML内容,并在WebView的onPageFinished回调中执行了JavaScript脚本来实现分页效果。JavaScript脚本监听了键盘事件,当用户按下"ArrowRight"、"PageDown"键时,会切换到下一页;当用户按下"ArrowLeft"、"PageUp"键时,会切换到上一页。

在安卓应用中渲染HTML并实现分页,你可以使用WebView组件来加载和显示HTML内容,并结合JavaScript和CSS来实现分页效果。下面是一个简单的示例代码,演示如何在安卓应用中实现HTML渲染和分页功能:

  1. 在布局文件(例如activity_main.xml)中添加一个WebView组件:
xmlCopy code
<WebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
  1. 在Java代码中加载HTML内容并设置分页效果:
javaCopy code
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private WebView webView;

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = findViewById(R.id.webview);

        // 设置WebView的配置
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true); // 启用JavaScript

        // 设置WebView的客户端
        webView.setWebViewClient(new WebViewClient());
        webView.setWebChromeClient(new WebChromeClient());

        // 加载HTML内容
        String htmlContent = "<html><body><h1>Hello, WebView!</h1><p>This is some sample HTML content.</p></body></html>";
        webView.loadDataWithBaseURL(null, htmlContent, "text/html", "UTF-8", null);

        // 执行JavaScript脚本以实现分页效果
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);

                // 执行JavaScript脚本以实现分页效果
                String javascript = "javascript:(function() {" +
                        "    var maxScrollHeight = document.documentElement.scrollHeight;" +
                        "    var currentPage = 0;" +
                        "    var pageSize = window.innerHeight;" +
                        "    var pageCount = Math.ceil(maxScrollHeight / pageSize);" +
                        "    function nextPage() {" +
                        "        if (currentPage < pageCount - 1) {" +
                        "            currentPage++;" +
                        "            window.scrollTo(0, currentPage * pageSize);" +
                        "        }" +
                        "    }" +
                        "    function previousPage() {" +
                        "        if (currentPage > 0) {" +
                        "            currentPage--;" +
                        "            window.scrollTo(0, currentPage * pageSize);" +
                        "        }" +
                        "    }" +
                        "    window.addEventListener('keyup', function(event) {" +
                        "        if (event.key === 'ArrowRight' || event.key === 'PageDown') {" +
                        "            nextPage();" +
                        "        } else if (event.key === 'ArrowLeft' || event.key === 'PageUp') {" +
                        "            previousPage();" +
                        "        }" +
                        "    });" +
                        "})();";
                webView.loadUrl(javascript);
            }
        });
    }
}

以上代码中,我们使用WebView加载了一个简单的HTML内容,并在WebView的onPageFinished回调中执行了JavaScript脚本来实现分页效果。JavaScript脚本监听了键盘事件,当用户按下"ArrowRight"、"PageDown"键时,会切换到下一页;当用户按下"ArrowLeft"、"PageUp"键时,会切换到上一页。

请注意,为了使JavaScript代码生效,我们需要在AndroidManifest.xml文件中添加android.permission.INTERNET权限。

责任编辑:武晓燕 来源: 今日头条

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