如何防止VideoView/MediaPlayer停止其他应用的音频？

Question

在一个屏幕中,我有一个循环背景视频(显示正常的UI元素),使用VideoView实现,如下所示:

String resPath = "android.resource://" + getPackageName() + "/" + R.raw.bg_video;
videoView.setVideoURI(Uri.parse(resPath));

// Hide controls:
MediaController controller = new MediaController(getActivity());
controller.setVisibility(View.GONE);
videoView.setMediaController(controller);

// Use looping:
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
    @Override
    public void onPrepared(MediaPlayer mp) {
        mp.setLooping(true);
    }
});

videoView.start();

视频效果很好.唯一的问题是,当显示此视图时(或者甚至在使用例如ViewPager之前),来自其他应用程序的音乐播放将停止.

我正在使用的视频本身没有声音.有没有办法在"静音模式"下设置VideoView或它使用的MediaPlayer？即,告诉它根本不要做音频,特别是不要乱用其他应用的音频.

试着mp.setVolume(0, 0);在onPrepared(),但它没有任何效果.

Answer 1

VideoView从Android源复制粘贴并注释掉这些行:

AudioManager am = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);
am.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

MutedVideoView例如,您可以命名新类.

请点击这里:https://gist.github.com/vishna/7e9d3466bced8502fcdd

Answer 2

已接受的解决方案并不保证所有Android版本的兼容性,并且是一个肮脏的黑客而不是真正的解决方案.我已经尝试过所有形式的黑客工作,但没有一个能让我满意.

我已经提出了一个更好的解决方案 - 从a切换VideoView到a TextureView并用a加载它MediaPlayer.用户的观点没有区别,只是没有音频停止.

这是我玩MP4循环的用例:

private TextureView _introVideoTextureView;
private MediaPlayer _introMediaPlayer;

...

@Override
public void onCreate(...) {
    _introVideoTextureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
           try {
               destoryIntroVideo();

               _introMediaPlayer = MediaPlayer.create(SignInActivity.this, R.raw.intro_video);
               _introMediaPlayer.setSurface(new Surface(surfaceTexture));
               _introMediaPlayer.setLooping(true);
               _introMediaPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING);
               _introMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                    @Override
                    public void onPrepared(MediaPlayer mediaPlayer) {
                        mediaPlayer.start();
                    }
                });

            } catch (Exception e) {
                System.err.println("Error playing intro video: " + e.getMessage());
            }
        }

        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int i, int i1) {}

        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
            return false;
        }

        @Override
        public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {}
    });
}

@Override
public void onDestroy() {
    super.onDestroy();

    destoryIntroVideo();
}

private void destoryIntroVideo() {
    if (_introMediaPlayer != null) {
        _introMediaPlayer.stop();
        _introMediaPlayer.release();
        _introMediaPlayer = null;
    }
}

Answer 3

这对我有用：

videoView.setAudioFocusRequest(AudioManager.AUDIOFOCUS_NONE);

（.setVideUri()通话前）