如何在另一个播放时在 android 中准备媒体播放器？

Question

我使用 MediaPlayer 来播放来自 http 流的视频，是否有任何解决方案可以在第一个媒体播放器仍在播放时使用另一个 http url 准备第二个媒体播放器？ 我想播放两个没有黑屏的视频，第一个结束第二个立即开始。

这是我的代码：

public class VideoActivity extends Activity implements SurfaceHolder.Callback {


private MediaPlayer mediaPlayer;
private SurfaceHolder surfaceHolder;
private SurfaceView playerSurfaceView;
private String videoSrc  = "http://192.168.1.101:8090/api/video/";
private String android_id;

private MediaPlayer next;
private static boolean firstCall = true;
private String secondVideoSrc = "http://192.168.1.101:8090/api/secondvideo/";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_video);

    playerSurfaceView = (SurfaceView)findViewById(R.id.playersurface);
    surfaceHolder = playerSurfaceView.getHolder();
    surfaceHolder.addCallback(this);

    GetDeviceId();
    videoSrc += android_id;
    secondVideoSrc += android_id;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
    prepareVideoPlayer();

}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}

private void GetDeviceId() {
    android_id = Settings.Secure.getString(getBaseContext().getContentResolver(),
            Settings.Secure.ANDROID_ID);
}



private void prepareVideoPlayer() {
    try {
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setDisplay(surfaceHolder);
        mediaPlayer.setDataSource(this, Uri.parse(videoSrc));
        mediaPlayer.setScreenOnWhilePlaying(true);
        mediaPlayer.prepareAsync();
        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mp) {
                if(firstCall) {
                    mediaPlayer.start();
                    firstCall = false;
                }
                new AsyncPrepareNext().execute();
            }
        });
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                next.start();
            }
        });
    }
    catch(Exception ex) {
    }
}
private void prepareNext() {
    try {
        next = new MediaPlayer();
        next.setDisplay(surfaceHolder);
        next.setDataSource(this, Uri.parse(secondVideoSrc));
        next.setScreenOnWhilePlaying(true);
        next.prepareAsync();
        next.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mp) {

            }
        });
        next.setAudioStreamType(AudioManager.STREAM_MUSIC);
        next.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {

            }
        });
    }
    catch(Exception ex) {
    }
}
private class AsyncPrepareNext extends AsyncTask<Void,Void,Void> {

    @Override
    protected Void doInBackground(Void... params) {
        prepareNext();
        return null;
    }
}

}

当我运行第一个视频时，开始播放 2 或 3 秒，然后停止并出现一些错误，例如媒体服务器死机、音频投掷器死机、错误 (100,0)、错误 (38,0)

Answer 1

您可能需要实现 OnPreparedListener() 和 OnCompletedListener() 来完成此操作，并且您可能还需要 2 个媒体播放器。

    @Override
    public void onPrepared(MediaPlayer mp){
        // Set Video Source for second video
        mp.setDataSource(path);
        // Prepare second video
        mp.prepareAsync();
    }
    @Override
    public void onCompletion(MediaPlayer mp){
        // Start second video here
        mp.start();
    }

并像这样设置它们：

    mediaPlayer.setOnPreparedListener(new OnPreparedListener());
    mediaPlayer.setOnCompletedListener(new OnCompletionListener());