问多个活动的MediaPlayer和SurfaceView
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Stack Overflow用户

提问于 2016-10-02 18:04:50

回答 1查看 248关注 0票数 0

我有一个媒体播放器在一个活动(称为播放器)，我希望能够支持连续视频播放时，播放器是关闭成一个小型视图的父活动。

在只有音频的情况下，我能够很好地做到这一点，问题在于我通过mediaPlayer.setDisplay()附加了一个mediaPlayer.setDisplay；

我可以附加SurfaceView刚开始只是很好，但问题开始时，我关闭播放器活动。如果我不做任何更改，mediaPlayer就会以通常的无用错误(1，-19)被抛入错误状态。

当播放器setDisplay被销毁时，我尝试使用SurfaceView (Null)，这似乎是有效的。但出于某种原因，它重置了视频流。为了弄清发生了什么，我尝试过重写seekTo()，但是没有调用seekTo()。我还把日志语句放在我能想到的任何地方，但没有触发任何东西。

为什么setDisplay(null)会导致我的视频流重新启动？

下面是我当前的MediaPlayer代码(一些奇怪的东西来自于我试图解决这个问题(比如isReallyPlaying())：

  private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
    private ScheduledFuture beeperhandle;

    private boolean isPaused = false;
    private BaseMedia currentMedia;

    private PlaybackService.RepeatStatus repeatStatus = PlaybackService.RepeatStatus.REPEAT_NONE;

    public void startMedia(BaseMedia model, Integer position) {
        Timber.d("Starting media");
        startBeeper();
        isPaused = false;
        lastBeep = -1;
        currentMedia = model;

        if (position != null) {
            seekTo(position);
        }
        super.start();
    }

    public BaseMedia getCurrentMedia() {
        return currentMedia;
    }



    @Override
    public void start() throws IllegalStateException {
        Timber.e("Invalid start called, should request startSong or startVideo");
    }

    private int lastBeep = -1;

    // Because isPlaying is returning false and canceling the beeper.  Probably has something to do with the surfaceview being destroyed
    private boolean isStillPlaying() {
        if (lastBeep != getCurrentPosition()) {
            lastBeep = getCurrentPosition();
            return true;
        }
        return false;
    }

    private final Runnable seekBarCheck = new Runnable() {
        public void run() {

            if (isStillPlaying() && !beeperhandle.isCancelled()) {
                EventBus.getDefault().post(new MusicStatusTimeEvent(
                        currentMedia, true, GevaldMediaPlayer.this));
            } else {
                Timber.d("Canceling Beeper, !isPlaying");
                beeperhandle.cancel(true);
            }
        }
    };

    private void startBeeper() {
        Timber.d("Starting Beeper");
        beeperhandle = scheduler.scheduleAtFixedRate(seekBarCheck, 100, 100, TimeUnit.MILLISECONDS);
    }

    @Override
    public void seekTo(final int msec) throws IllegalStateException {
        Timber.d("Seeking to " + msec);
        if (beeperhandle != null) {
            Timber.d("Canceling beeper in prep for seek");
            beeperhandle.cancel(true);
        }
        setOnSeekCompleteListener(new OnSeekCompleteListener() {
            @Override
            public void onSeekComplete(MediaPlayer mp) {
                Timber.d("Seek complete to: " + msec);
                startBeeper();
            }
        });
        super.seekTo(msec);
    }


    @Override
    public void stop() throws IllegalStateException {
        super.stop();
        Timber.d("Stopping media");
        doStop();
    }

    private void doStop() {
        if (beeperhandle != null) {
            Timber.d("Canceling beeper, doStop");
            beeperhandle.cancel(true);
        }
        isPaused = false;
    }

    @Override
    public void pause() throws IllegalStateException {
        Timber.d("Pause requested");
        if (beeperhandle != null) {
            Timber.d("Canceling beeper, pause");
            beeperhandle.cancel(true);
        }
        doStop();
        EventBus.getDefault().post(new MusicStatusStoppedEvent(this));
        super.pause();

    }

    public boolean isPaused() {
        return isPaused;
    }