Android闹钟音量逐渐增加

我有一个Alarm类,可以按时播放默认的警报音.我想播放警报音,一次将音量从最小调到最大.我如何逐渐将音量从最小增加到最大.是否有示例代码或项目的链接.请帮我

解决方法:

您可以自己做.没什么复杂的.

触发PendingIntent后,请使用处理程序来进行增加.

>创建将以AudioManager或应用程序上下文作为参数的类.

  public class VolumeRunnable implements Runnable{

private AudioManager mAudioManager;
private Handler mHandlerThatWillIncreaseVolume;
private final static int DELAY_UNTILL_NEXT_INCREASE = 30*1000;//30 seconds between each increment
VolumeRunnable(AudioManager audioManager, Handler handler){
   this.mAudioManager = audioManager;
   this.mHandlerThatWillIncreaseVolume = handler;
}

@Override
public void run(){
   int currentAlarmVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_ALARM);
   if(currentAlarmVolume != mAudioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM)){ //if we havent reached the max

   //here increase the volume of the alarm stream by adding currentAlarmVolume+someNewFactor
        mHandlerThatWillIncreaseVolume.postDelayed(this,DELAY_UNTILL_NEXT_INCREASE); //"recursively call this runnable again with some delay between each increment of the volume, untill the condition above is satisfied. 
   }

}

}
>触发PendingIntent后,调用此Runnable：

someHandler.post(new VolumeRunnable(mAudioManager, someHandler));

我希望这能给您想法.原谅任何错误或错别字.

标签：android-audiomanager,android-alarms,volume,media,android
来源： https://codeday.me/bug/20191030/1969503.html