Android：逐渐增加通知声音的音量

Question

我收到一条通知，我想逐渐增加声音，直到它被解雇/接听。我怎么能这样做？感谢你的帮助！

Answer 1

这就是我如何执行这个任务。首先我捕捉最初的设置。毕业后，一旦用户解除通知，我会拨打另一个功能返回设置。下面是即将毕业的声音代码：

public static void graduateVolumeLevel(Context context) { 
    getVolumeLevel(context); 
    final AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); 
    final int DELAY_UNTIL_NEXT_INCREASE = 6 * 1000; 

    LaunchService.startThread(); 

    mHandlerIncreaseVolume = new Handler(appService.thread.getLooper()); 
    /*you may not need this part. 
    I use it b/c i run my stuff on another thread not to 
    interfere with the main thread. 
    Creating a new handler on main thread may be sufficient for your needs.*/ 

    if(runnable==null) { 
     runnable = new Runnable() { 
      @Override 
      public void run() { 
       int currentSystemVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_SYSTEM); 
       int currentRingVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_RING); 

       if (currentSystemVolume != mAudioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM)|| 
         currentRingVolume != mAudioManager.getStreamMaxVolume(AudioManager.STREAM_RING)) { //if not max 
        //increase the volume of the alarm stream 
        mAudioManager.setStreamVolume(AudioManager.STREAM_RING,currentRingVolume++,0); 
        mAudioManager.setStreamVolume(AudioManager.STREAM_SYSTEM, currentRingVolume++, 0); 

        if(mHandlerIncreaseVolume!=null) 
        mHandlerIncreaseVolume.postDelayed(this, DELAY_UNTIL_NEXT_INCREASE); 
       } 
      } 
     }; 
    } 

    mHandlerIncreaseVolume.post(runnable); 
} 

我发现了一个类似的帖子，但无法再找到它引用它。这是我用来创建我的代码的东西，稍微修改一下，因为这个例子并没有按照原样工作。同样，一旦我返回原始设置，我从处理程序中删除回调并将其设置为null。