Music Player App - 避免两个音乐播放器同时播放

Question

我正在使用 ExoPlayer 开发歌曲播放器应用程序。 我目前遇到的问题是，在 Android 7.x 设备上，用户可以同时收听两个播放器。这似乎是新 Android 版本的事情。

我想知道是否可以避免这种行为，使用户在我的应用程序上收听媒体时无法收听两个播放器。

Answer 1

您可能需要在应用程序中管理音频焦点。 你可以在这里看看： https://developer.android.com/guide/topics/media-apps/audio-focus.html

To avoid every music app playing at the same time, Android introduces the idea of audio focus. Only one app can hold audio focus at a time.

When your app needs to output audio, it should request audio focus.

AudioManager mAudioManager_ = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
AudioManager.OnAudioFocusChangeListener mOnAudioFocusChangeListener_ = new AudioManager.OnAudioFocusChangeListener()
        {   @Override
            public void onAudioFocusChange (int focusChange)
            {   switch (focusChange)
                {   case AudioManager.AUDIOFOCUS_GAIN:
                        Log.e("DEBUG", "##### AUDIOFOCUS_GAIN");
                        break;
                    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                        Log.e("DEBUG", "##### AUDIOFOCUS_LOSS_TRANSIENT");
                        break;
                    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                        Log.e("DEBUG", "##### AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK");
                        break;
                    case AudioManager.AUDIOFOCUS_LOSS:
                        Log.e("DEBUG", "##### AUDIOFOCUS_LOSS");
                        break;
                }
            }
        };


if (mAudioManager_.requestAudioFocus(mOnAudioFocusChangeListener_, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN) == AudioManager.AUDIOFOCUS_REQUEST_GRANTED)
{   // start play
    // ...
    mAudioManager_.abandonAudioFocus(mOnAudioFocusChangeListener_);
}