Question

我正在制作一个android studio apk，在更改活动时，我希望淡出Mediaplayer中播放的歌曲，但它等待淡出结束，然后再转到下一个活动。我如何同时淡出和活动过渡？

    float volume = 1f;
    while (volume > 0f) {
        MainActivity.mediaPlayer.setVolume(volume, volume);
        volume = volume - 0.1f;
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
    MainActivity.mediaPlayer.stop();

Answer 1

我抬起头来，找到了解决方法

 private void fadeOut(final MediaPlayer mPlayer, final int duration) {
        final float deviceVolume = getDeviceVolume();
        Handler h = new Handler();
        h.postDelayed(new Runnable() {
            private float time = duration;
            private float volume = 0.0f;

            @Override
            public void run() {
                if (!mPlayer.isPlaying()){
                    mPlayer.start();
                    time -= 100;
                    volume = (deviceVolume * time) / duration;
                    mPlayer.setVolume(volume, volume);
                }
                if (time > 0){
                    h.postDelayed(this, 100);
                }else {
                    mPlayer.stop();
                }
            }
        }, 100);
    }
 }

 public static float getDeviceVolume() {
    int volumeLevel = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
    int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
    return (float) volumeLevel / maxVolume;
 }

您可以像这样fadeOut(MainActivity.mediaPlayer,5000);

使用

如何在后台淡出Mediaplayer？

1 个答案: