android 音量调节以及媒体音量界面

播放音乐类软件，用户在调节音量的时候，弹出系统的媒体音量界面，与项目的设计风格格格不入。

于是，调节音量，同时显示自己定义的媒体音量界面很有必要。

1）调整音乐音量

private AudioManager audioManager = null; // 音频

audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);

增加减少音量：

audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND
| AudioManager.FLAG_SHOW_UI);

audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND
| AudioManager.FLAG_SHOW_UI);

AudioManager.FLAG_SHOW_UI即显示了媒体音量界面，去掉即可隐藏。重写onKeyDown方法：

@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_PLAY_SOUND);
   return true;
  case KeyEvent.KEYCODE_VOLUME_DOWN:
   audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
     AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);
   return true;
  default:
   break;
  }
  return super.onKeyDown(keyCode, event);
}

同时显示自己定义的媒体音量界面即可。

2）自定义媒体音量界面

需要获取当前音量。方法如下：

private void GetV() {
  // 通话音量
  int max = audioManager
    .getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL);
  int current = audioManager
    .getStreamVolume(AudioManager.STREAM_VOICE_CALL);
  Log.d("VIOCE_CALL", "max : " + max + " current : " + current);

  // 系统音量
  max = audioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM);
  current = audioManager.getStreamVolume(AudioManager.STREAM_SYSTEM);
  Log.d("SYSTEM", "max : " + max + " current : " + current);

  // 铃声音量
  max = audioManager.getStreamMaxVolume(AudioManager.STREAM_RING);
  current = audioManager.getStreamVolume(AudioManager.STREAM_RING);
  Log.d("RING", "max : " + max + " current : " + current);

  // 音乐音量
  max = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
  current = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
  Log.d("MUSIC", "max : " + max + " current : " + current);

  // 提示声音音量
  max = audioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM);
  current = audioManager.getStreamVolume(AudioManager.STREAM_ALARM);
  Log.d("ALARM", "max : " + max + " current : " + current);
}

得到当前音量和最大音量，可以绘制和自己应用风格一致的媒体音量界面了。

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