视频播放ExoPlayer

GitHub

https://github.com/google/ExoPlayer

1. 介绍

ExoPlayer是一款适用于Android的应用程序级媒体播放器。它为Android的MediaPlayer API提供了一个替代方案，可以在本地和互联网上播放音频和视频。ExoPlayer支持Android的MediaPlayer API目前不支持的功能，包括DASH和SmoothStreaming自适应回放。与MediaPlayer API不同，ExoPlayer易于定制和扩展，并且可以通过Play Store应用程序更新进行更新。

2. 简单使用

相比于原生的videoview，非常重要的一点就是播放播放的资源不是直接通过videoview.setUri（）方法直接实现。exoplayer有一个专门管理播放资源的东西MediaSource。

1 导入依赖

最新的依赖版本请见GitHub，演示采用2.11.7版本

//exoplayer
implementation 'com.google.android.exoplayer:exoplayer:2.11.7'

2.加入JAVA 1.8支持

compileOptions {sourceCompatibility JavaVersion.VERSION_1_8targetCompatibility JavaVersion.VERSION_1_8
}

3 编写界面

<com.google.android.exoplayer2.ui.PlayerViewandroid:id="@+id/exo_playerview"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="40dp"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintBottom_toTopOf="@id/playercontrol"/>

4 设置播放（最简单）

1. 设置player参数，使用SimpleExoPlayer
1. 设置MediaSource播放资源
1. 为playerview设置资源

// 1.设置player参数
private SimpleExoPlayer player;/** The scheme part of a raw resource URI. */
public static final String RAW_RESOURCE_SCHEME = "rawresource";private void initializePlayer() {if (player==null){player = ExoPlayerFactory.newSimpleInstance(this);exoPlayerView.setPlayer(player);                  //这个exoPlayer就是界面上的//设置播放（准备好立刻播放）player.setPlayWhenReady(playWhenReady);player.seekTo(currentWindow, playbackPosition);}// Produces DataSource instances through which media data is loaded.DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this,Util.getUserAgent(this, String.valueOf(getApplication())));// This is the MediaSource representing the media to be played.ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();// 2.设置MediaSource播放资源MediaSource videoSource = new ExtractorMediaSource(Uri.parse(Uri.parse(RAW_RESOURCE_SCHEME + ":///" + R.raw.media_test).toString()),dataSourceFactory, extractorsFactory, null, null);// Prepare the player with the source.// 3.为playerview设置资源player.prepare(videoSource);
}

3. 总结

ExoPlayer定制化其实很高，可以像上面那样简单实现，也可以个性化定制，具体可见源码。

同时也有大佬为这个东西写了一个简单的封装工具类：

https://www.jianshu.com/p/547dc4a8ebe4

public class ExoPlayerManger {private static final String TAG = "ExoPlayerManger";private Context mContext;private BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();// 创建轨道选择工厂private TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);// 创建轨道选择器实例private TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);private SimpleExoPlayer simpleExoPlayer;private DataSource.Factory dataSourceFactory;private String mVideoUrl;private SimpleCache simpleCache;private Uri playVideoUri;private ExtractorMediaSource mediaSource;/*** @param context 传入context*/public void setBuilderContext(Context context) {mContext = context;dataSourceFactory = new DefaultDataSourceFactory(mContext, "seyed");}/*** @param videoUrl 传入视频路径*/public void setVideoUrl(String videoUrl) {this.mVideoUrl = videoUrl;simpleCache = VideoCache.getInstance(mContext);playVideoUri = Uri.parse(mVideoUrl);}/*** @return 返回exoPlayer对象*/public SimpleExoPlayer create() {try {simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(mContext, trackSelector);dataSourceFactory = new CacheDataSourceFactory(simpleCache, dataSourceFactory);mediaSource = new ExtractorMediaSource.Factory(dataSourceFactory).createMediaSource(playVideoUri);simpleExoPlayer.prepare(mediaSource);} catch (Exception e) {}return simpleExoPlayer;}}

public class VideoCache {private static SimpleCache sDownloadCache;/*** @param context* @return*/public static SimpleCache getInstance(Context context) {if (sDownloadCache == null) {sDownloadCache = new SimpleCache(new File(getMediaCacheFile(context), "StoryCache"), new LeastRecentlyUsedCacheEvictor(512 * 1024 *1024));}return sDownloadCache;}public static File getMediaCacheFile(Context context) {String directoryPath = "";String childPath = "exoPlayer";if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {// 外部储存可用directoryPath = File.separator + context.getExternalFilesDir(childPath).getAbsolutePath();} else {directoryPath = File.separator + context.getFilesDir().getAbsolutePath() + File.separator + childPath;}File file = new File(directoryPath);//判断文件目录是否存在if (!file.exists()) {file.mkdirs();}return file;}}

使用如下：

     ExoPlayerManger exoPlayerManger = new ExoPlayerManger();exoPlayerManger.setBuilderContext(this);//设置Uri// exoPlayerManger.setVideoUrl(playVideoUrl);//设置从raw下读取的文件路径exoPlayerManger.setVideoUrl(RawResourceDataSource.buildRawResourceUri(R.raw.media_test).toString());SimpleExoPlayer simpleExoPlayer = exoPlayerManger.create();//设置音量simpleExoPlayer.setVolume(10);simpleExoPlayer.setVolume(0);// simpleExoPlayer.setRepeatMode(1);playerView.setPlayer(simpleExoPlayer);//监听（可自定义拓展）//simpleExoPlayer.addListener(this);//开启播放simpleExoPlayer.setPlayWhenReady(true);

4.GitHub小demo地址

https://github.com/ONLY-yours/ExoPlayerDemo