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前面写一些基础知识的学习，这篇写个小demo，实现视频循环播放功能。
1、xml代码：

<TextureViewandroid:id="@+id/textureView"android:layout_width="600px"android:layout_height="400px"android:focusable="false" /> 

2、初始化视频资源，这里把需要播放的视频集成在应用中，位置放在res/raw下。

private void initVideoUri() {mVideoUris = new ArrayList<>();mVideoUris.add(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.video1));mVideoUris.add(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.video2));mVideoUris.add(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.video3));
}

3、初始化TextureView，并设置监听，需求需要给给TextureView加一个圆角，角度是16。

private void initTextureView() {mTextureView = findViewById(R.id.textureView);//加圆角mTextureView.setOutlineProvider(new TextureVideoViewOutlineProvider(16));mTextureView.setClipToOutline(true);mTextureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {@Overridepublic void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {// SurfaceTexture准备就绪，初始化MediaPlayerinitPlayer(surfaceTexture);}@Overridepublic void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {// SurfaceTexture缓冲大小变化}@Overridepublic boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {// SurfaceTexture即将被销毁return false;}@Overridepublic void onSurfaceTextureUpdated(SurfaceTexture surface) {// SurfaceTexture通过updateImage更新}});
}

圆角类：

public class TextureVideoViewOutlineProvider extends ViewOutlineProvider {private float mRadius;public TextureVideoViewOutlineProvider(float radius) {this.mRadius = radius;}@Overridepublic void getOutline(View view, Outline outline) {Rect rect = new Rect();view.getGlobalVisibleRect(rect);int leftMargin = 0;int topMargin = 0;Rect selfRect = new Rect(leftMargin, topMargin,rect.right - rect.left - leftMargin, rect.bottom - rect.top - topMargin);outline.setRoundRect(selfRect, mRadius);}}

4、初始化MediaPalyer播放器

private void initPlayer(SurfaceTexture surfaceTexture) {try {mPlayer = new MediaPlayer();mPlayer.setSurface(new Surface(surfaceTexture));mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);mPlayer.setDataSource(mContext, mVideoUris.get(0));mPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {@Overridepublic void onPrepared(MediaPlayer mp) {//这里可以调用start()方法开始播放视频      mPlayer.start(); }}mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {//循环播放列表中的内容if (mPlayIndex < mVideoUris.size() - 1) {mPlayIndex = ++mPlayIndex;} else {mPlayIndex = 0;}Log.e(TAG, "onCompletion - mPlayIndex: " + mPlayIndex);playVideo(mVideoUris.get(index));}}mPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {@Overridepublic boolean onError(MediaPlayer mp, int what, int extra) {Log.e(TAG, "onError - what: " + what + " | extra: " + extra);return false;}}mPlayer.prepareAsync();} catch (IOException e) {Log.e(TAG, e.toString());}
}   

5、视频播放

private void playVideo(Uri uri) {try {mPlayer.reset();mPlayer.setDataSource(mContext, uri);mPlayer.prepareAsync();} catch (IOException e) {Log.e(TAG, e.toString());}

6、资源释放

private void releaseMediaPlayer() {if (mPlayer != null) {if (mPlayer.isPlaying()) {mPlayer..stop();}mPlayer.release();}
}

这个demo只是简单实现，具体播放最好放子线程进行。

如何实现TextureView或者SurfaceView 预览框为圆角