MediaController播放圖標以編程方式更改為暫停圖標

Question

我使用exoPlayer播放音樂，我通過android提供的mediaController控制音樂。 我真正想要的是任何外部事件（例如電話呼叫）都不僅應暫停播放，還應將圖標更改為暫停。 我已經設法使用電話管理器Api查找我是否在通話中，並且能夠在“暫停”時暫停mediaPlayBack，但顯然無法更改播放圖標以在此通話事件上暫停。

MediaPlayerControl有一個pause（）函數，在暫停播放的地方調用該函數。 播放暫停，但圖標未更改，請告訴我是否有任何好的方法

PhoneStateListener phoneStateListener = new PhoneStateListener() {
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        if (state == TelephonyManager.CALL_STATE_RINGING) {

            PlayerControl.pause();

        }

        if(TelephonyManager.CALL_STATE_OFFHOOK == state) {
            PlayerControl.pause();

        }

        super.onCallStateChanged(state, incomingNumber);
    }
};


public class PlayerControl implements MediaPlayerControl {

  private final ExoPlayer exoPlayer;

  public PlayerControl(ExoPlayer exoPlayer) {
    this.exoPlayer = exoPlayer;
  }

  @Override
  public boolean canPause() {
    return true;
  }

  @Override
  public boolean canSeekBackward() {
    return true;
  }

  @Override
  public boolean canSeekForward() {
    return true;
  }

  /**
   * This is an unsupported operation.
   * <p>
   * Application of audio effects is dependent on the audio renderer used. When using
   * {@link com.google.android.exoplayer.MediaCodecAudioTrackRenderer}, the recommended approach is
   * to extend the class and override
   * {@link com.google.android.exoplayer.MediaCodecAudioTrackRenderer#onAudioSessionId}.
   *
   * @throws UnsupportedOperationException Always thrown.
   */
  @Override
  public int getAudioSessionId() {
    throw new UnsupportedOperationException();
  }

  @Override
  public int getBufferPercentage() {
    return exoPlayer.getBufferedPercentage();
  }

  @Override
  public int getCurrentPosition() {
    return exoPlayer.getDuration() == ExoPlayer.UNKNOWN_TIME ? 0
        : (int) exoPlayer.getCurrentPosition();
  }

  @Override
  public int getDuration() {
    return exoPlayer.getDuration() == ExoPlayer.UNKNOWN_TIME ? 0
        : (int) exoPlayer.getDuration();
  }

  @Override
  public boolean isPlaying() {
    return exoPlayer.getPlayWhenReady();
  }

  @Override
  public void start() {
    exoPlayer.setPlayWhenReady(true);
  }

  @Override
  public void pause() {
    exoPlayer.setPlayWhenReady(false);
  }

  @Override
  public void seekTo(int timeMillis) {
    long seekPosition = exoPlayer.getDuration() == ExoPlayer.UNKNOWN_TIME ? 0
        : Math.min(Math.max(0, timeMillis), getDuration());
    exoPlayer.seekTo(seekPosition);
  }

}

Answer 1

（看來這個問題仍未解決）。 我認為您可以在Activity onPause（）的覆蓋范圍內更改圖標，如下所示：

Boolean isPlayIconOn;

isPlayIconOn=true; // set this flag to true when your icon is on "play"

@Override
public void onPause() {
    super.onPause();
    if (isPlayIconOn) {
       // insert code to change your icon to "pause" here;
       isPlayIconOn=false;
    }   
}

同樣，您可以在應用恢復時通過onResume（）@override將圖標改回來：

@Override
public void onResume() {
    super.onResume();
    if (!isPlayIconOn) {
       // insert code to change your icon to "play" here;
       isPlayIconOn=true;
    }   
}