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/设置媒体音量？我已尝试以下操作：

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;

onCreate 内部：

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

您应该使用 AudioManager.STREAM_MUSIC 而不是 AudioManager.STREAM_RING
这个问题已经在此处讨论过。

Answer 3

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 4

尝试一下：

setVolumeControlStream(AudioManager.STREAM_MUSIC);

Answer 5

您可以将您的活动设置为使用特定的音量。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

如果您碰巧想要调整音量条（类似于您在 iPhone 的 iPod 应用程序上看到的内容），请按以下步骤操作。

    @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

以下代码将媒体流音量设置为最大：

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

Answer 8

将音量设置为 0

AudioManager audioManager;
audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);

将音量设置为满

AudioManager audioManager;
audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);

可以通过更改 0 到 20 之间的索引值来调整音量