音频视频声音的播放处理

public class SimpleAudioFocusHelper {
  private AudioManager mAudioManager;
  private AudioManager.OnAudioFocusChangeListener mAudioFocusChangeListener = focusChange -> {

  };

  public SimpleAudioFocusHelper() {
    mAudioManager =
        (AudioManager) KwaiApp.getAppContext().getSystemService(Context.AUDIO_SERVICE);
  }

  public boolean requestAudioFocus() {
    if (mAudioFocusChangeListener == null || mAudioManager == null) {
      return false;
    }

    final int granted = AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
      return granted == mAudioManager.requestAudioFocus(buildFocusRequest());
    } else {
      return granted == mAudioManager.requestAudioFocus(mAudioFocusChangeListener,
          AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
    }

  }

  public boolean abandonFocus() {
    if (mAudioFocusChangeListener == null || mAudioManager == null) {
      return false;
    }

    final int granted = AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
      return granted == mAudioManager.abandonAudioFocusRequest(buildFocusRequest());
    } else {
      return granted == mAudioManager.abandonAudioFocus(mAudioFocusChangeListener);
    }
  }

  @TargetApi(Build.VERSION_CODES.O)
  private AudioFocusRequest buildFocusRequest() {
    AudioAttributes attributes = new AudioAttributes.Builder()
        .setLegacyStreamType(AudioManager.STREAM_MUSIC)
        .setUsage(AudioAttributes.USAGE_MEDIA)
        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
        .build();
    return new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN_TRANSIENT)
        .setAudioAttributes(attributes)
        .setAcceptsDelayedFocusGain(false)
        .setOnAudioFocusChangeListener(mAudioFocusChangeListener)
        .build();
  }
}