Android 如何通过编程控制MediaPlayer的音量？

我正在使用

MediaPlayer

在60秒内播放音乐。我希望在播放音乐时按照以下规则增加声音：

1. First 10 seconds, the volume is 20% of maximum volume
2. From 20 seconds to 30 seconds, the volume is 40% of maximum volume 
3. From 30 seconds to 40 seconds, the volume is 80% of maximum volume 
3. From 40 seconds to 60 seconds, the volume is 100% of maximum volume 

如何通过Android M编程控制MediaPlayer的音量？。这是我播放音乐的代码。它缺少任务控制卷。谢谢大家

public MediaPlayer mpCalling = null;
private CountDownTimer mCountDownTimer_Playing;
public void playSound(){
    Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
    try {
        if (mpCalling != null &&  mpCalling.isPlaying()) {
        mpCalling.stop();
        mpCalling.release();
        mpCalling=null;
        }
        mpCalling = MediaPlayer.create(getApplicationContext(), notification);
        mpCalling.start();
        if(mCountDownTimer_Playing!=null){
        mCountDownTimer_Playing.cancel();
        mCountDownTimer_Playing=null;
        }
        mCountDownTimer_Playing = new CountDownTimer(60000,1000) {
        @Override
        public void onTick(long millisUntilFinished) {

        }
        @Override
        public void onFinish() {
            mpCalling.stop();
        }
        };
        mCountDownTimer_Playing.start();
    } catch (Exception e) {
        e.printStackTrace();
    }
} 

您可以使用，获取最大音量并根据使用情况进行划分。试试这个。希望这对你有帮助。