android之exoplayer

google出版的exoplayer使用：

背景：项目最近要用到exoplayer播放远程摄像头录制的视频，原代码已经有写过，但视频不能重复播放的，基于此点经行修改

/*** Created  on  2019/05/29.* interface by** @author fengzimin*/
public class SimpleExoPlayerHelper {private final Context mContext;private SimpleExoPlayer mSimpleExoPlayer;private ConcatenatingMediaSource mConcatenatingMediaSource;private static SimpleExoPlayerHelper simpleExoPlayerHelper;public SimpleExoPlayerHelper(Context context, PlayerView playerView) {mContext = context;// 创建带宽BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();// 创建轨道选择工厂TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);// 创建轨道选择器实例TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);//step2. 创建播放器mSimpleExoPlayer = ExoPlayerFactory.newSimpleInstance(context, trackSelector);playerView.setPlayer(mSimpleExoPlayer);mConcatenatingMediaSource = new ConcatenatingMediaSource();}public static SimpleExoPlayerHelper createMySimpleExoPlayer(Context context, PlayerView playerView) {simpleExoPlayerHelper = new SimpleExoPlayerHelper(context, playerView);return simpleExoPlayerHelper;}/*** @return 提供simpleExoPlayer对象，实现其他功能*/public SimpleExoPlayer getSimpleExoPlayer() {return mSimpleExoPlayer;}public SimpleExoPlayerHelper prepare(List<String> urls) {for (String url : urls) {MediaSource mediaSource = buildMediaSource(url);mConcatenatingMediaSource.addMediaSource(mediaSource);}mSimpleExoPlayer.prepare(mConcatenatingMediaSource);return simpleExoPlayerHelper;}public SimpleExoPlayerHelper prepare(String url) {List<String> strings = new ArrayList<>();strings.add(url);prepare(strings);return simpleExoPlayerHelper;}public enum RepeatMode {REPEAT_MODE_ALL(Player.REPEAT_MODE_ALL),REPEAT_MODE_ONE(Player.REPEAT_MODE_ONE),REPEAT_MODE_OFF(Player.REPEAT_MODE_OFF);private int mMode;RepeatMode(int repeatMode) {mMode = repeatMode;}public int getMode() {return mMode;}public void setMode(int mode) {mMode = mode;}}/*** 设置循环样式** @param repeatMode* @return*/public SimpleExoPlayerHelper setRepeatMode(RepeatMode repeatMode) {mSimpleExoPlayer.setRepeatMode(repeatMode.getMode());return simpleExoPlayerHelper;}public SimpleExoPlayerHelper setPlayWhenReady(boolean playWhenReady) {mSimpleExoPlayer.setPlayWhenReady(playWhenReady);return simpleExoPlayerHelper;}public void stop() {mSimpleExoPlayer.stop();}public void pause() {boolean playWhenReady = mSimpleExoPlayer.getPlayWhenReady();if(playWhenReady) {mSimpleExoPlayer.setPlayWhenReady(false);}}public void start() {boolean playWhenReady = mSimpleExoPlayer.getPlayWhenReady();if(!playWhenReady) {mSimpleExoPlayer.setPlayWhenReady(true);}}public void release() {mSimpleExoPlayer.release();}private MediaSource buildMediaSource(String url) {String proxyUrl = getProxyUrl(url);return newVideoSource(proxyUrl);}/*** 获取带缓存的视频url** @param originalUrl* @return*/private String getProxyUrl(String originalUrl) {HttpProxyCacheServer proxy = VideoCacheProxy.getProxy(mContext);return proxy.getProxyUrl(originalUrl);}/*** 构造播放数据** @param url* @return*/private MediaSource newVideoSource(String url) {//测量播放过程中的带宽。 如果不需要，可以为null。DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();// 生成加载媒体数据的DataSource实例。DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(mContext,Util.getUserAgent(mContext, "useExoplayer"), bandwidthMeter);// 生成用于解析媒体数据的Extractor实例。ExtractorMediaSource.Factory factory = new ExtractorMediaSource.Factory(dataSourceFactory);ExtractorMediaSource mediaSource = factory.createMediaSource(Uri.parse(url));//        ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();//        return new ExtractorMediaSource(Uri.parse(url), dataSourceFactory, extractorsFactory, null,//                null);return mediaSource;}
}

设置缓存

public class App extends Application implements VideoCacheProxy.AppWrapper {private HttpProxyCacheServer mProxy;private HttpProxyCacheServer newProxy() {// 这里的配置可以修改，参考上面的“这里”return new HttpProxyCacheServer.Builder(this)// 视频缓存文件所在的文件夹，可以进行修改.cacheDirectory(VideoCacheProxy.getVideoCacheDir(this)).build();}@Overridepublic HttpProxyCacheServer getVideoCacheProxy() {return mProxy == null ? (mProxy = newProxy()) : mProxy;}
}

使用方法：

1.导入依赖包

    //exoplayer播放器implementation 'com.google.android.exoplayer:exoplayer:2.8.4'// 视频缓存implementation 'com.danikula:videocache:2.7.0'

2.xml布局中添加PlayerView

<com.google.android.exoplayer2.ui.PlayerViewandroid:id="@+id/exo_play_2"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"app:layout_constraintTop_toTopOf="parent"/>

3.使用工具类

    private void initExo2() {//播放的数据源List<String> strings = new ArrayList<>();strings.add("https://lixiang.https.xiaozhuschool.com/statics/images/shiping/1556521397576.mp4");strings.add("https://lixiang.https.xiaozhuschool.com/statics/images/shiping/net1.mp3");strings.add("https://lixiang.https.xiaozhuschool.com/statics/images/shiping/1556521318783.mp4");//设置mSimpleExoPlayerHelper1 = SimpleExoPlayerHelper.createMySimpleExoPlayer(this, mExoPlay2).prepare(strings).setRepeatMode(SimpleExoPlayerHelper.RepeatMode.REPEAT_MODE_ONE).setPlayWhenReady(true);//是否显示默认进度条mExoPlay.setUseController(true);}

VideoCacheProxy 类：

public class VideoCacheProxy {public static HttpProxyCacheServer getProxy(Context context) {Context app = context.getApplicationContext();AppWrapper wrapper = null;try {wrapper = (AppWrapper) app;return wrapper.getVideoCacheProxy();} catch (Exception e) {e.printStackTrace();throw new ClassCastException("Application not implemented com.example.communication.VideoCacheProxy.AppWrapper");}}public static File getVideoCacheDir(Context context) {return new File(context.getExternalCacheDir(), "video-cache");}public interface AppWrapper {HttpProxyCacheServer getVideoCacheProxy();}
}

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