Android自定义WebView实现Youtube网络视频播放控件

﹏ヽ暗。殇╰゛Y 2022-09-24 13:18 283阅读 0赞

实现效果：

![Center][]

项目github地址：[https://github.com/AlexZhuo/AlxYoutubePlayer][https_github.com_AlexZhuo_AlxYoutubePlayer]

因为业务需要，以下代码均以Youtube网站在线视频为例

实现功能：

1、初始化的时候显示标题和视频封面

2、初始化的时候显示一个play按钮

3、不需要依赖任何SDK，或者导入任何第三方库

4、播放过程中可以暂停，可以拖动进度条快进

5、可以全屏播放

6、切换页面的时候会自动暂停

7、页面退出的时候自动销毁WebView

8、不需要申请任何开发者账号或者获取授权

原理：

首先需要一个继承WebView的自定义控件，这里起名叫做YoutubePlayerView，在页面初始化的时候用这个WebView去加载一个事先写好的HTML，当然在加载之前，需要把Youtube的视频id和一些播放参数设置进去。然后一个小的播放窗口就完成了，此时已经完成用户点击play按钮就播放的功能。

但是光能播放还不行，我们还需要捕捉用户的点击事件，比如播放，暂停等等操作，而这些操作本身写在Youtube的JS代码中（Youtube已经把JS调用相关代码的位置预留好，就等着开发者来复写相关的代码了），需要在JS代码中调用java代码，这样就需要有一个JS调用java的接口，这里起名叫QualsonBridge，通过使用WebVIew的addJavascriptInterface（）方法将Java代码的接口设置进去，并且需要一个接口实现类，实现的方法名称方法要和JS接口规定的方法一模一样，以便反射调用，一会会把详细的代码贴出来。

完成以上两点，就已经完成了播放，暂停等操作，但是还需要在Activity退出或者被覆盖的时候暂停WebView的播放，所以还需要给这个WebView写一个onDestroy的方法，并在fragment的onDestroy中调用，里面执行的主要就是清楚缓存的操作，还需要WebView写一个onPause的方法，在fragment的onPause中调用，里面主要执行JS代码：javascript:onVideoPause()

关于全屏播放：是通过一个自定义的WebChromeClient来实现将WebView扩大到全屏并修改旋转角度进行播放

代码实现：

首先需要让WebView去加载一块HTML，这段HTML是从Youtube的官方SDK中抽取出来的，本质上是一个HTML编写的小播放窗口，代码如下

<!DOCTYPE html>
    <html>
    <style type="text/css">
      html, body {
         height:100%;
         width:100%;
         margin: 0;
         padding: 0;
         background:[BG_COLOR];
         overflow:hidden;
         position:relative;
      }
    </style>
    <script type = "text/javascript" src = "http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <script type = "text/javascript" src = "https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/jquery-ui.min.js"></script>
    <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"/>
    <script src="https://www.youtube.com/iframe_api"></script>
    </head>
    <body>
      <div id="QPlayer"></div>
    </body>
    <script type="text/javascript">
      var player;
      function onYouTubeIframeAPIReady() {
          player = new YT.Player('QPlayer', {
          height: '100%',
          width: '100%',
          videoId: '[VIDEO_ID]',
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange,
            'onPlaybackQualityChange': onPlayerPlaybackQualityChange,
            'onPlaybackRateChange': onPlayerPlaybackRateChange,
            'onError': onPlayerError,
            'onApiChange': onPlayerApiChange
          },
          playerVars: {
            'autoplay': [AUTO_PLAY],
            'autohide':[AUTO_HIDE],
            'rel': [REL],
            'showinfo': [SHOW_INFO],
            'enablejsapi': [ENABLE_JS_API],
            'disablekb': [DISABLE_KB],
            'cc_lang_pref': '[CC_LANG_PREF]',
            'controls': [CONTROLS],
    		'fs' : [FS],
    		'origin' : 'https://www.youtube.com'
          }
        });
      }
    
      function onPlayerReady(event) {
        console.log('player is ready');
        onReady('player is ready');
        sendDuration();
        player.setOption("captions", "track", {"languageCode": "es"});
        player.unloadModule("captions");
      }
    
      var timerId = 0;
      function onPlayerStateChange(event) {
        clearTimeout(timerId);
        switch (event.data) {
          case YT.PlayerState.UNSTARTED:
            onStateChange("UNSTARTED");
            break;
          case YT.PlayerState.ENDED:
            onStateChange("ENDED");
            break;
          case YT.PlayerState.PLAYING:
            player.unloadModule("captions");
            onStateChange("PLAYING");
            timerId = setInterval(function() {
              setCurrentSeconds();
            }, 100);
            break;
          case YT.PlayerState.PAUSED:
            onStateChange("PAUSED");
            break;
          case YT.PlayerState.BUFFERING:
            onStateChange("BUFFERING");
            break;
          case YT.PlayerState.CUED:
            onStateChange("CUED");
            break;
        }
      }
    //底下的这些function就是调用java代码的接口函数
      function onPlayerPlaybackQualityChange(playbackQuality) {
       console.log('playback quality changed to ' + playbackQuality.data);
       onPlaybackQualityChange('playback quality changed to ' + playbackQuality.data);
      }
    
      function onPlayerPlaybackRateChange(playbackRate) {
       console.log('playback rate changed to ' + playbackRate.data);
       onPlaybackRateChange('playback rate changed to ' + playbackRate.data);
      }
    
      function onPlayerError(e) {
       console.log('An error occurred: ' + e.data);
       onError('An error occurred: ' + e.data);
      }
    
      function onPlayerApiChange() {
       console.log('The player API changed');
       onApiChange('The player API changed');
      }
    
      function onReady(e){
        window.QualsonInterface.onReady(e);
      }
    //这个函数是最重要的，用于通知Android代码播放状态改变
      function onStateChange(e){
        window.QualsonInterface.onStateChange(e);
      }
    
      function onPlaybackQualityChange(e){
        window.QualsonInterface.onPlaybackQualityChange(e);
      }
    
      function onPlaybackRateChange(e){
        window.QualsonInterface.onPlaybackRateChange(e);
      }
    
      function onError(e){
        window.QualsonInterface.onError(e);
      }
    
      function onApiChange(e){
        window.QualsonInterface.onApiChange(e);
      }
    
      function setCurrentSeconds(){
        window.QualsonInterface.currentSeconds(player.getCurrentTime());
      }
    
      function sendDuration(){
        window.QualsonInterface.duration(player.getDuration());
      }
    
      function setLog(msg){
        window.QualsonInterface.logs(msg);
      }
    
      function onSeekTo(startSeconds){
        player.seekTo(startSeconds, true)
      }
    
      function onVideoPause(){
        player.pauseVideo();
      }
    
      function onVideoStop(){
        player.stopVideo();
      }
    
      function onVideoPlay(){
        player.playVideo();
      }
    
      function onHideControls(){
        setLog("onHideControls()");
      }
    
      function loadVideo(videoId, startSeconds){
        setLog(videoId + "_" + startSeconds);
        player.loadVideoById(videoId, startSeconds);
      }
    
      function cueVideo(videoId){
        setLog(videoId);
        player.cueVideoById(videoId, 0, "default");
        player.setVolume(100)
      }
    </script>
    </html>

项目中把这一段代码放到了raw文件夹下，并通过下面这样一个方法去加载，并在加载的同时，把上面预留的一些参数比如视频id什么的给补上

/**
         * 自己写一段HTML，并设置好Youtube的视频id，放到WebView中进行显示
         * @param videoId
         * @return
         */
        private String getVideoHTML(String videoId) {
            try {
                InputStream in = getResources().openRawResource(R.raw.players);
                if (in != null) {
                    InputStreamReader stream = new InputStreamReader(in, "utf-8");
                    BufferedReader buffer = new BufferedReader(stream);
                    String read;
                    StringBuilder sb = new StringBuilder("");
    
                    while ((read = buffer.readLine()) != null) {
                        sb.append(read + "\n");
                    }
    
                    in.close();
    
                    String html = sb.toString().replace("[VIDEO_ID]", videoId).replace("[BG_COLOR]", backgroundColor);
                    html = html.replace("[AUTO_PLAY]", String.valueOf(params.getAutoplay())).replace("[AUTO_HIDE]", String.valueOf(params.getAutohide())).replace("[REL]", String.valueOf(params.getRel())).replace("[SHOW_INFO]", String.valueOf(params.getShowinfo())).replace("[ENABLE_JS_API]", String.valueOf(params.getEnablejsapi())).replace("[DISABLE_KB]", String.valueOf(params.getDisablekb())).replace("[CC_LANG_PREF]", String.valueOf(params.getCc_lang_pref())).replace("[CONTROLS]", String.valueOf(params.getControls())).replace("[FS]", String.valueOf(params.getFs()));
                    return html;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "";
        }

这里面传来的videoId一般是从Youtube视频分享url中用正则解析出来的，比如：https://youtu.be/DdRwiH4mR0Q

DdRwiH4mR0Q就是videoId

还需要一个给JS代码调用java代码的接口，要复写上面html中events中和function中的所有方法，如下

/**
         * WEB TO APP Javascript的安卓接口，用于在安卓上部署JS代码，这里是将JS回调到Android中，让JS触发Java代码
         * 需要在JS代码合适地方调用这里面的方法，在js中有一个函数如下：
         * function onPlayerStateChange(event)
         * 和这样一个函数
         * function onStateChange(e){
                window.QualsonInterface.onStateChange(e);//用于回调java代码
            }
         并且这个需要在java代码中使用 this.addJavascriptInterface(bridge, "QualsonInterface");来注册
         */
        private class QualsonBridge {
    
            @JavascriptInterface
            public void onReady(String arg) {
                JLogUtils.d(TAG, "onReady(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onReady();
                }
            }
    
            @JavascriptInterface
            public void onStateChange(String arg) {
                JLogUtils.d(TAG, "onStateChange(" + arg + ")");
                if ("UNSTARTED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.UNSTARTED);
                } else if ("ENDED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.ENDED);
                } else if ("PLAYING".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.PLAYING);
                } else if ("PAUSED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.PAUSED);
                } else if ("BUFFERING".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.BUFFERING);
                } else if ("CUED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.CUED);
                }
            }
    
            @JavascriptInterface
            public void onPlaybackQualityChange(String arg) {
                JLogUtils.d(TAG, "onPlaybackQualityChange(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onPlaybackQualityChange(arg);
                }
            }
    
            @JavascriptInterface
            public void onPlaybackRateChange(String arg) {
                JLogUtils.d(TAG, "onPlaybackRateChange(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onPlaybackRateChange(arg);
                }
            }
    
            @JavascriptInterface
            public void onError(String arg) {
                JLogUtils.e(TAG, "onError(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onError(arg);
                }
            }
    
            @JavascriptInterface
            public void onApiChange(String arg) {
                JLogUtils.d(TAG, "onApiChange(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onApiChange(arg);
                }
            }
    
            @JavascriptInterface
            public void currentSeconds(String seconds) {
                if (youTubeListener != null) {
                    youTubeListener.onCurrentSecond(Double.parseDouble(seconds));
                }
            }
    
            @JavascriptInterface
            public void duration(String seconds) {
                if (youTubeListener != null) {
                    youTubeListener.onDuration(Double.parseDouble(seconds));
                }
            }
    
            @JavascriptInterface
            public void logs(String arg) {
                JLogUtils.d(TAG, "logs(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.logs(arg);
                }
            }
        }

向js注册这个JAVA接口使用WebView的addJavascriptInterface(bridge, "QualsonInterface");方法

这里面的youTubeListener是自己写的一个接口类，用于方便回调UI方法的

下面贴出这个自定义WebView的完整代码：

package com.imaginato.qravedconsumer.widget.player;
    
    import android.annotation.SuppressLint;
    import android.app.Activity;
    import android.content.Context;
    import android.content.Intent;
    import android.net.Uri;
    import android.os.Build;
    import android.util.AttributeSet;
    import android.util.DisplayMetrics;
    import android.util.Log;
    import android.view.View;
    import android.webkit.JavascriptInterface;
    import android.webkit.WebChromeClient;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    
    import com.qraved.app.R;
    
    import java.io.BufferedReader;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.lang.ref.WeakReference;
    import java.lang.reflect.Field;
    
    public class YoutubePlayerView extends WebView {
    
        private static final String TAG = YoutubePlayerView.class.getSimpleName();
    
        private QualsonBridge bridge = new QualsonBridge();
    
        private YTParams params = new YTParams();
    
        private YouTubeListener youTubeListener;
        private String backgroundColor = "#000000";
        private STATE mPlayState = STATE.UNSTARTED;
    
        public YoutubePlayerView(Context context) {
            super(context);
            setWebViewClient(new MyWebViewClient((Activity) context));
        }
    
        public YoutubePlayerView(Context context, AttributeSet attrs) {
            super(context, attrs);
            setWebViewClient(new MyWebViewClient((Activity) context));
        }
    
        @SuppressLint("JavascriptInterface")
        public void initialize(String videoId, YouTubeListener youTubeListener, WebChromeClient webChromeClient) {
            WebSettings set = this.getSettings();
            set.setJavaScriptEnabled(true);
            set.setUseWideViewPort(true);
            set.setLoadWithOverviewMode(true);
            set.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NORMAL);
            set.setCacheMode(WebSettings.LOAD_NO_CACHE);
            set.setPluginState(WebSettings.PluginState.ON);
            set.setPluginState(WebSettings.PluginState.ON_DEMAND);
            set.setAllowContentAccess(true);
            set.setAllowFileAccess(true);
    
            if (webChromeClient != null) {
                this.setWebChromeClient(webChromeClient);
            }
    
            this.mPlayState = STATE.UNSTARTED;
            this.youTubeListener = youTubeListener;
            this.setLayerType(View.LAYER_TYPE_NONE, null);
            this.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
            this.addJavascriptInterface(bridge, "QualsonInterface");//注册js代码调用java代码的接口
            this.loadDataWithBaseURL("https://www.youtube.com", getVideoHTML(videoId), "text/html", "utf-8", null);
            this.setLongClickable(true);
            this.setOnLongClickListener(new OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    return true;
                }
            });
    
        }
    
        public void initialize(String videoId, YTParams params, YouTubeListener youTubeListener, WebChromeClient webChromeClient) {
            if (params != null) {
                this.params = params;
            }
            initialize(videoId, youTubeListener, webChromeClient);
        }
    
        public void setWhiteBackgroundColor() {
            backgroundColor = "#ffffff";
        }
    
        public void setAutoPlayerHeight(Context context) {
            DisplayMetrics displayMetrics = new DisplayMetrics();
            ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
            this.getLayoutParams().height = (int) (displayMetrics.widthPixels * 0.5625);
        }
    
        /**
         * 让WebView去执行JS代码javascript:onVideoPause()，来暂停视频
         */
        public void pause() {
            Log.d(TAG, "pause");
            this.loadUrl("javascript:onVideoPause()");
        }
        /**
         * 让WebView去执行JS代码，来停止视频
         */
        public void stop(){
            Log.d(TAG,"stop");
            this.loadUrl("javascript:onVideoStop()");
        }
    
        public STATE getPlayerState(){
            Log.d(TAG,"getPlayerState");
            return mPlayState;
        }
    
        public void play() {
            Log.d(TAG, "play");
            this.loadUrl("javascript:onVideoPlay()");
        }
    
        private void notifyStateChange(STATE state){
            if(youTubeListener!=null){
                youTubeListener.onStateChange(state);
            }
            this.mPlayState = state;
        }
    
        /**
         * WEB TO APP Javascript的安卓接口，用于在安卓上部署JS代码，这里是将JS回调到Android中，让JS触发Java代码
         * 需要在JS代码合适地方调用这里面的方法，在js中有一个函数如下：
         * function onPlayerStateChange(event)
         * 和这样一个函数
         * function onStateChange(e){
                window.QualsonInterface.onStateChange(e);//用于回调java代码
            }
         并且这个需要在java代码中使用 this.addJavascriptInterface(bridge, "QualsonInterface");来注册
         */
        private class QualsonBridge {
    
            @JavascriptInterface
            public void onReady(String arg) {
                Log.d(TAG, "onReady(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onReady();
                }
            }
    
            @JavascriptInterface
            public void onStateChange(String arg) {
                Log.d(TAG, "onStateChange(" + arg + ")");
                if ("UNSTARTED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.UNSTARTED);
                } else if ("ENDED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.ENDED);
                } else if ("PLAYING".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.PLAYING);
                } else if ("PAUSED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.PAUSED);
                } else if ("BUFFERING".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.BUFFERING);
                } else if ("CUED".equalsIgnoreCase(arg)) {
                    notifyStateChange(STATE.CUED);
                }
            }
    
            @JavascriptInterface
            public void onPlaybackQualityChange(String arg) {
                Log.d(TAG, "onPlaybackQualityChange(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onPlaybackQualityChange(arg);
                }
            }
    
            @JavascriptInterface
            public void onPlaybackRateChange(String arg) {
                Log.d(TAG, "onPlaybackRateChange(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onPlaybackRateChange(arg);
                }
            }
    
            @JavascriptInterface
            public void onError(String arg) {
                Log.e(TAG, "onError(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onError(arg);
                }
            }
    
            @JavascriptInterface
            public void onApiChange(String arg) {
                Log.d(TAG, "onApiChange(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.onApiChange(arg);
                }
            }
    
            @JavascriptInterface
            public void currentSeconds(String seconds) {
                if (youTubeListener != null) {
                    youTubeListener.onCurrentSecond(Double.parseDouble(seconds));
                }
            }
    
            @JavascriptInterface
            public void duration(String seconds) {
                if (youTubeListener != null) {
                    youTubeListener.onDuration(Double.parseDouble(seconds));
                }
            }
    
            @JavascriptInterface
            public void logs(String arg) {
                Log.d(TAG, "logs(" + arg + ")");
                if (youTubeListener != null) {
                    youTubeListener.logs(arg);
                }
            }
        }
    
    
        /**
         * NonLeakingWebView
         */
        private static Field sConfigCallback;
    
        static {
            try {
                sConfigCallback = Class.forName("android.webkit.BrowserFrame").getDeclaredField("sConfigCallback");
                sConfigCallback.setAccessible(true);
            } catch (Exception e) {
                // ignored
            }
        }
    
        public void onDestroy() {
            super.onDetachedFromWindow();
            // View is now detached, and about to be destroyed
            youTubeListener = null;
            this.clearCache(true);
            this.clearHistory();
            try {
                if (sConfigCallback != null)
                    sConfigCallback.set(null, null);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    
        private class MyWebViewClient extends WebViewClient {
            protected WeakReference<Activity> activityRef;
    
            public MyWebViewClient(Activity activity) {
                this.activityRef = new WeakReference<Activity>(activity);
            }
    
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                try {
                    final Activity activity = activityRef.get();
                    if (activity != null)
                        activity.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
                } catch (RuntimeException ignored) {
                    // ignore any url parsing exceptions
                }
                return true;
            }
    
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                Log.d(TAG, "onPageFinished()");
            }
        }
    
        public interface YouTubeListener {
            void onReady();//可以显示播放按钮进行播放
    
            void onStateChange(STATE state);//暂停等等状态
    
            void onPlaybackQualityChange(String arg);//清晰度改变
    
            void onPlaybackRateChange(String arg);
    
            void onError(String arg);
    
            void onApiChange(String arg);
    
            void onCurrentSecond(double second);
    
            void onDuration(double duration);
    
            void logs(String log);
        }
    
        public enum STATE {
            UNSTARTED,
            ENDED,
            PLAYING,
            PAUSED,
            BUFFERING,
            CUED,
            NONE
        }
    
        /**
         * 自己写一段HTML，并设置好Youtube的视频id，放到WebView中进行显示
         * @param videoId
         * @return
         */
        private String getVideoHTML(String videoId) {
            try {
                InputStream in = getResources().openRawResource(R.raw.players);
                if (in != null) {
                    InputStreamReader stream = new InputStreamReader(in, "utf-8");
                    BufferedReader buffer = new BufferedReader(stream);
                    String read;
                    StringBuilder sb = new StringBuilder("");
    
                    while ((read = buffer.readLine()) != null) {
                        sb.append(read + "\n");
                    }
    
                    in.close();
    
                    String html = sb.toString().replace("[VIDEO_ID]", videoId).replace("[BG_COLOR]", backgroundColor);
                    html = html.replace("[AUTO_PLAY]", String.valueOf(params.getAutoplay())).replace("[AUTO_HIDE]", String.valueOf(params.getAutohide())).replace("[REL]", String.valueOf(params.getRel())).replace("[SHOW_INFO]", String.valueOf(params.getShowinfo())).replace("[ENABLE_JS_API]", String.valueOf(params.getEnablejsapi())).replace("[DISABLE_KB]", String.valueOf(params.getDisablekb())).replace("[CC_LANG_PREF]", String.valueOf(params.getCc_lang_pref())).replace("[CONTROLS]", String.valueOf(params.getControls())).replace("[FS]", String.valueOf(params.getFs()));
                    return html;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "";
        }
    }

在Fragment中初始化的代码

View youtubeView = LayoutInflater.from(journalActivity).inflate(R.layout.layout_youtube_player, null);
            YoutubePlayerView youtubePlayerView = (YoutubePlayerView) youtubeView.findViewById(R.id.youtubePlayerView);
            youtubePlayerView.setAutoPlayerHeight(journalActivity);
            youtubePlayerView.initialize(videoID, new YoutubePlayerCallBack(youtubePlayerView), mWebChromeClient);
            ll_journal.addView(youtubeView,ll_journal.getChildCount()-1);

上面提到的布局文件R.layout.layout\_youtube\_player如下

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
                 android:orientation="vertical">
    
        <com.xxx.YoutubePlayerView
            android:id="@+id/youtubePlayerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="10dp"/>
    
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_gravity="top"
            android:clickable="true"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="10dp">
        </FrameLayout>
    
    </FrameLayout>

上面提到的WebChromeClient定义如下，用于控制全屏播放的

private WebChromeClient mWebChromeClient = new WebChromeClient(){
    
            @Override
            public View getVideoLoadingProgressView() {
                    LayoutInflater inflater = LayoutInflater.from(activity);
                    mVideoProgressView = inflater.inflate(R.layout.video_layout_loading, null);
                
                return mVideoProgressView;
            }
    
            @Override
            public void onShowCustomView(View view,
                                         WebChromeClient.CustomViewCallback callback) {
                // if a view already exists then immediately terminate the new one
                if(journalActivity==null){
                    return;
                }
                if (mCustomView != null) {
                    onHideCustomView();
                    return;
                }
    
                // 1. Stash the current state
                mCustomView = view;
                mOriginalSystemUiVisibility = journalActivity.getWindow().getDecorView().getSystemUiVisibility();
                mOriginalOrientation = journalActivity.getRequestedOrientation();
    
                // 2. Stash the custom view callback
                mCustomViewCallback = callback;
    
                // 3. Add the custom view to the view hierarchy
                FrameLayout decor = (FrameLayout) journalActivity.getWindow().getDecorView();
                decor.addView(mCustomView, new FrameLayout.LayoutParams(
                        ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.MATCH_PARENT));
                if(mVideoFullScreenBack!=null){
                    mVideoFullScreenBack.setVisibility(View.VISIBLE);
                }
    
                // 4. Change the state of the window
                activity.getWindow().getDecorView().setSystemUiVisibility(
                        View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                                View.SYSTEM_UI_FLAG_FULLSCREEN |
                                View.SYSTEM_UI_FLAG_IMMERSIVE);
                activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            }
    
            @Override
            public void onHideCustomView() {
                if (journalActivity == null) {
                    return;
                }
                // 1. Remove the custom view
                FrameLayout decor = (FrameLayout) journalActivity.getWindow().getDecorView();
                decor.removeView(mCustomView);
                mCustomView = null;
                if(mVideoFullScreenBack!=null){
                    mVideoFullScreenBack.setVisibility(View.GONE);
                }
    
                // 2. Restore the state to it's original form
                journalActivity.getWindow().getDecorView()
                        .setSystemUiVisibility(mOriginalSystemUiVisibility);
                journalActivity.setRequestedOrientation(mOriginalOrientation);
    
                // 3. Call the custom view callback
                if(mCustomViewCallback!=null){
                    mCustomViewCallback.onCustomViewHidden();
                    mCustomViewCallback = null;
                }
    
            }
        };

上面提到的R.layout.view\_layout\_loading布局文件如下,仅仅是一个progressBar当占位符用的

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
                 android:gravity="center"
                 android:orientation="vertical">
    
        <ProgressBar
            android:id="@android:id/progress"
            style="?android:attr/progressBarStyleLarge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"/>
    
    </FrameLayout>

从url中抽取VideoId的方法如下

private String parseIDfromVideoUrl(String videoUrl){
            
            int startIndex = videoUrl.indexOf(VIDEO_ID_START);
            if(startIndex != -1){
                startIndex = startIndex + VIDEO_ID_START.length();
                int endIndex = videoUrl.indexOf("?");
                if(endIndex == -1){
                    endIndex = videoUrl.length();
                }
                if(startIndex < endIndex){
                    return videoUrl.substring(startIndex,endIndex);
                }
            }
            return "";
        }

因为本项目在同一个fragment中放了好多的这样的视频播放控件，所以为了统一他们暂停，销毁操作，这里使用了一个ArrayList进行维护

当切换到其他fragment或者有新的Activity压到上面的时候暂停WebView的播放，fragment总的onPause方法这么写：

@Override
        public void onPause() {
            if(playerViewList!=null){
                for(YoutubePlayerView v : playerViewList){
                    if(v.getPlayerState() == YoutubePlayerView.STATE.PLAYING ){
                        v.pause();
                    }else if(v.getPlayerState() == YoutubePlayerView.STATE.BUFFERING){
                        v.stop();
                    }
                }
            }
            super.onPause();
        }

还需要让fragment在销毁的时候释放WebView的资源如下：

@Override
        public void onDestroy() {
            super.onDestroy();
    
            if(playerViewList!=null){
                for(YoutubePlayerView v : playerViewList){
                    if(v!=null){
                        v.onDestroy();
                    }
                }
            }
    }

在按下返回按钮时关闭全屏显示的代码

@Override
        public void onBackPressed() {
           
                            boolean isClose = currentJournalFragment.closeFullScreen();
                            if(isClose){
                                return;
                            }
             
                }

这个fragment的closeFullScreen方法如下

public boolean closeFullScreen(){
            if(mCustomView!=null && mCustomViewCallback!=null){
                mWebChromeClient.onHideCustomView();
                return true;
            }
            return false;
        }

这里面的mCustomViewCallback 是WebChromeClient的onShowCustomView（）方法的第二个参数，使用一个全局变量把它引用起来

[Center]: /images/20220719/72beb9b0cfc242e882c0a455289d573d.png
[https_github.com_AlexZhuo_AlxYoutubePlayer]: https://github.com/AlexZhuo/AlxYoutubePlayer