Question

从这个blog我了解到，对于所有媒体应用程序，我应该请求AudioFocus并仅在授予AudioFocus时才开始播放。

am.requestAudioFocus(audioFocusChangeListener,AudioManager.STREAM_ALARM,AudioManager.AUDIOFOCUS_GAIN);

我正在报警申请作为一个警报，它应该一直响，直到被解雇 - 除了在电话呼叫期间（这是合乎逻辑的）。

我可以使用TelephonyManager

跟踪呼叫是振铃还是空闲

TelephonyManager telephonyManager =
        (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
    telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);

    switch (telephonyManager.getCallState()) {
      case TelephonyManager.CALL_STATE_IDLE:
        outsidePause = false;
        break;
      default:
        outsidePause = true;
        break;
    }
PhoneStateListener phoneStateListener = new PhoneStateListener() {
    @Override public void onCallStateChanged(int state, String incomingNumber) {
      switch (state) {

        case TelephonyManager.CALL_STATE_IDLE:
          outsidePause = false;
          Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE,
              Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
          android.provider.Settings.System.putInt(getContentResolver(),
              android.provider.Settings.System.SCREEN_BRIGHTNESS, (0));
          am.setStreamVolume(AudioManager.STREAM_ALARM, 0, 0);
          setInnerData();
          startAlarm();
          break;
        default:
          outsidePause = true;
          vibrator.cancel();
          pauseAlarm();
          break;
      }
      super.onCallStateChanged(state, incomingNumber);
    }
  };

考虑到TelephonyManager，使用AudioFocus是否有用且非常有用（如果是，哪种模式更可取）？

另一个应用程序是否可以从我的应用程序中取出它，使警报静音？

Answer 1

似乎，如果确定，使用音频焦点。 Othet应用程序不接受它，直到我放弃它。

Answer 2

伙计们，当警报或音乐播放器或WhatsApp视频通话或电话通话在所有这些情况下都可以正常工作时，您可以在onAudioFocusChange（）方法中使用以下代码来管理音频焦点



// (Below code) Mandatory method for onAudioFocusChange
    @Override
    public void onAudioFocusChange(int focusChange) {

        switch(focusChange)
        {

            case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
           // Whenever Alarm is started command comes to this place

                notificationView.setImageViewResource(R.id.remoteViewImageView, playbutton);
                    notificationManager.notify(1,notification);
                    playButtonImage.setImageResource(playbutton);
                    say = false;

                mediaPlayer.pause();
                break;

            case AudioManager.AUDIOFOCUS_GAIN :

                if(mediaPlayer.isPlaying())
                {
                    notificationView.setImageViewResource(R.id.remoteViewImageView, pause);
                    notificationManager.notify(1,notification);
                    playButtonImage.setImageResource(pause);
                    say = false;
                    mediaPlayer.start();
                }
                break;

            case AudioManager.AUDIOFOCUS_LOSS:

                if(mediaPlayer.isPlaying())
                {
                    notificationView.setImageViewResource(R.id.remoteViewImageView, playbutton);

                    notificationManager.notify(1,notification);
                    playButtonImage.setImageResource(playbutton);

                    mediaPlayer.pause();
                    say = false;
                    audioManager.abandonAudioFocus(this);

                }
                break;


        }
    }
}

我需要为警报应用程序设置哪个AudioFocus

2 个答案: