如何在Android中获取/设置媒体音量(不是铃声音量)？

Question

有没有办法获取/设置媒体量？我尝试过以下方法:

AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
int currentVolume = audio.getStreamVolume(AudioManager.STREAM_RING);

但它返回铃声音量.

Answer 1

private AudioManager audio;

在onCreate里面:

audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

覆盖onKeyDown:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (keyCode) {
    case KeyEvent.KEYCODE_VOLUME_UP:
        audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
        return true;
    case KeyEvent.KEYCODE_VOLUME_DOWN:
        audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
        return true;
    default:
        return false;
    }
}

Answer 2

而不是AudioManager.STREAM_RING你应该使用AudioManager.STREAM_MUSIC 这个问题已在这里讨论过.

Answer 3

尝试一下这个:

setVolumeControlStream(AudioManager.STREAM_MUSIC);

Answer 4

AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
int currentVolume = audio.getStreamVolume(AudioManager.STREAM_MUSIC);
int maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float percent = 0.7f;
int seventyVolume = (int) (maxVolume*percent);
audio.setStreamVolume(AudioManager.STREAM_MUSIC, seventyVolume, 0);

Answer 5

您可以将活动设置为使用特定卷.在您的活动中,使用以下其中一项:

this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
this.setVolumeControlStream(AudioManager.STREAM_RING);  
this.setVolumeControlStream(AudioManager.STREAM_ALARM);  
this.setVolumeControlStream(AudioManager.STREAM_NOTIFICATION);  
this.setVolumeControlStream(AudioManager.STREAM_SYSTEM);  
this.setVolumeControlStream(AudioManager.STREAM_VOICECALL); 

Answer 6

如果你碰巧有一个你想要调整的音量条 - 与你在iPhone的iPod应用程序上看到的类似 - 这就是如何.

    @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    switch (keyCode) {
    case KeyEvent.KEYCODE_VOLUME_UP:
        audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
        //Raise the Volume Bar on the Screen
        volumeControl.setProgress( audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
                + AudioManager.ADJUST_RAISE);
        return true;
    case KeyEvent.KEYCODE_VOLUME_DOWN:
        //Adjust the Volume
        audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
        //Lower the VOlume Bar on the Screen
        volumeControl.setProgress(audioManager
                .getStreamVolume(AudioManager.STREAM_MUSIC)
                + AudioManager.ADJUST_LOWER);
        return true;
    default:
        return false;
    }

Answer 7

以下代码将媒体流卷设置为max:

AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,
    audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC),
    AudioManager.FLAG_SHOW_UI);