MediaPlayer的冻结而不是在Android 4.4的循环视频 [英] MediaPlayer freezes instead of looping video on Android 4.4

问题描述

我有对Galaxy Tab的3对Android 4.4的视频播放问题并没有随着$ P $会出现此问题pvious Android版本4.2。

I am having a problem with video playback on Android 4.4 on the Galaxy Tab 3. The issue did not occur with the previous Android version 4.2.

问题

我在玩一个循环的视频。这个工作非常出色为所有用户，直到标签3得到更新到Android 4.4。自那时以来，视频第一循环结束后冻结（它卡住视频的第一帧是precise）。

I am playing a video in a loop. This worked very well for all users, until the Tab 3 got updated to Android 4.4. Since then the video freezes after the first loop (it gets stuck on the first frame of the video to be precise).

我可以重现行为，而此刻的视频冻结我的LogCat中开始变得充满以下的输出：

I can reproduce that behaviour, and at the moment the video freezes my LogCat starts getting full with the following output:

16:25:25.239  14589-14601/my.app V/MediaPlayer? back from callback
16:25:25.499  14589-14686/my.app V/MediaPlayer? message received msg=7, ext1=0, ext2=0
16:25:25.499  14589-14686/my.app V/MediaPlayer? unrecognized message: (7, 0, 0)
16:25:25.499  14589-14686/my.app V/MediaPlayer? callback application
16:25:25.499  14589-14686/my.app V/MediaPlayer? back from callback
16:25:25.519  14589-14602/my.app V/MediaPlayer? message received msg=4, ext1=0, ext2=0
16:25:25.519  14589-14602/my.app V/MediaPlayer? Received seek complete
16:25:25.519  14589-14602/my.app V/MediaPlayer? All seeks complete - return to regularly scheduled program
16:25:25.519  14589-14602/my.app V/MediaPlayer? callback application
16:25:25.519  14589-14602/my.app V/MediaPlayer? back from callback
16:25:25.519  14589-14601/my.app V/MediaPlayer? message received msg=6, ext1=0, ext2=0
16:25:25.519  14589-14601/my.app V/MediaPlayer? Received MEDIA_STARTED
16:25:25.519  14589-14601/my.app V/MediaPlayer? callback application
16:25:25.519  14589-14601/my.app V/MediaPlayer? back from callback
16:25:25.789  14589-14686/my.app V/MediaPlayer? message received msg=7, ext1=0, ext2=0
16:25:25.789  14589-14686/my.app V/MediaPlayer? unrecognized message: (7, 0, 0)
16:25:25.789  14589-14686/my.app V/MediaPlayer? callback application
16:25:25.789  14589-14686/my.app V/MediaPlayer? back from callback
16:25:25.809  14589-14602/my.app V/MediaPlayer? message received msg=4, ext1=0, ext2=0
16:25:25.809  14589-14602/my.app V/MediaPlayer? Received seek complete

的code

以下（simplyfied）活动应该播放视频。 MediaPlayer.OnErrorListener（）和MediaPlayer.OnInfoListener（）将永远不会被调用。

The following (simplyfied) activity is supposed to play the video. MediaPlayer.OnErrorListener() and MediaPlayer.OnInfoListener() are never called.

public class VideoActivity extends Activity {

    private MediaPlayer mediaPlayer;
    private String videoPath = "some path obtained from the system";

    // [...]

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mediaPlayer = new MediaPlayer();
        startMovie();
    }

    private void startMovie(){

        mediaPlayer.stop();
        mediaPlayer.reset();
        mediaPlayer.setLooping(true);
        mediaPlayer.setDataSource(videoPath);
        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
                mp.start();
                mp.seekTo(0);
            }
        });
        mediaPlayer.prepare();
    }

}

视频可以与该活动的生命周期中不同的视频文件路径启动几次，这就是为什么我停下来，开始在电影之前播放器复位。

The video can be started several times with a different video file path during the lifetime of the activity, that's why I stop and reset the player before starting the movie.

到目前为止，我在互联网上发现的唯一解决办法是，以确保在MediaPlayer不会被GC回收（我通过不使它的方法，本地对象一样），并实现了激活锁定，这也是我做了没有效果

So far the only solutions I found on the internet were to make sure the MediaPlayer is not collected by the GC (which I do by not making it a method-local object) and implement the WakeLock, which I also did without effect.

任何人都可以请帮我在这里和点我在正确的方向？谢谢！

Can anyone please help me here and point me in the right direction? Thank you!

推荐答案

更​​多的是解决办法不是解决办法，我最终的不的循环使用视频的 setLooping 的MediaPlayer 的方法。相反，我现在重新启动在的MediaPlayer 的 OnCompletion 回调的视频。经过大量的努力，这是唯一的方法我得到它跨越我测试所有设备上工作。

More a workaround than a solution, I ended up not looping the video using the setLooping method of MediaPlayer. Instead I am now restarting the video in the OnCompletion callback of MediaPlayer. After a lot of trying this was the only way I got it to work across all devices I am testing on.

public class VideoActivity extends Activity {

    private MediaPlayer mediaPlayer;
    private String videoPath = "some path obtained from the system";

    // [...]

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mediaPlayer = new MediaPlayer();
        startMovie();
    }

    private void startMovie(){

        mediaPlayer.stop();
        mediaPlayer.reset();
        mediaPlayer.setDataSource(videoPath);

        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
                mp.start();
                mp.seekTo(0);
            }
        });

        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                startMovie();
            }
        });

        mediaPlayer.prepare();
    }

}

不过，如果有人对这个问题的有效解决方案，我会很乐意为纪念相应的答案是正确的。

Still, if someone has a valid solution to that problem I will be happy to mark the corresponding answer as correct.

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