android系统各种音量的获取与设置 以及监听音量变化

获取系统音量

通过程序获取android系统手机的铃声和音量。同样，设置铃声和音量的方法也很简单！

设置音量的方法也很简单，AudioManager提供了方法：

publicvoidsetStreamVolume(intstreamType,intindex,intflags)其中streamType有内置的常量，去文档里面就可以看到。

JAVA代码：

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

//通话音量
int max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_VOICE_CALL );
int current = mAudioManager.getStreamVolume( AudioManager.STREAM_VOICE_CALL );
Log.d(“VIOCE_CALL”, “max : ” + max + ” current : ” + current);//系统音量
max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_SYSTEM );
current = mAudioManager.getStreamVolume( AudioManager.STREAM_SYSTEM );
Log.d(“SYSTEM”, “max : ” + max + ” current : ” + current);//铃声音量
max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_RING );
current = mAudioManager.getStreamVolume( AudioManager.STREAM_RING );
Log.d(“RING”, “max : ” + max + ” current : ” + current);//音乐音量
max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_MUSIC );
current = mAudioManager.getStreamVolume( AudioManager.STREAM_MUSIC );
Log.d(“MUSIC”, “max : ” + max + ” current : ” + current);//提示声音音量
max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_ALARM );
current = mAudioManager.getStreamVolume( AudioManager.STREAM_ALARM );
Log.d(“ALARM”, “max : ” + max + ” current : ” + current);
ps：
　　游戏过程中只允许调整多媒体音量，而不允许调整通话音量。
　　setVolumeControlStream(AudioManager.STREAM_MUSIC);
　　长时间不动，不允许黑屏，View.setKeepScreenOn(true);
　　估计manifest文件中需要注册权限吧

调节媒体音量

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

重写 Activity 的 onKeyDown 方法

?
  @Override
   publicbooleanonKeyDown(intkeyCode, KeyEvent event) {
       switch(keyCode) {
       caseKeyEvent.KEYCODE_VOLUME_UP:
           audio.adjustStreamVolume(
               AudioManager.STREAM_MUSIC,
               AudioManager.ADJUST_RAISE,
               AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
           returntrue;
       caseKeyEvent.KEYCODE_VOLUME_DOWN:
           audio.adjustStreamVolume(
               AudioManager.STREAM_MUSIC,
               AudioManager.ADJUST_LOWER,
               AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
           returntrue;
       default:
           break;
       }
       returnsuper.onKeyDown(keyCode, event);
   }

private void registerVolumeChangeReceiver() {
        mSettingsContentObserver = new SettingsContentObserver(this, new Handler());
        getApplicationContext().getContentResolver().registerContentObserver(android.provider.Settings.System.CONTENT_URI, true, mSettingsContentObserver);
    }

    private void unregisterVolumeChangeReceiver(){
        getApplicationContext().getContentResolver().unregisterContentObserver(mSettingsContentObserver);
    }

    public class SettingsContentObserver extends ContentObserver {
        Context context;

        public SettingsContentObserver(Context c, Handler handler) {
            super(handler);
            context = c;
        }

        @Override
        public boolean deliverSelfNotifications() {
            return super.deliverSelfNotifications();
        }

        @Override
        public void onChange(boolean selfChange) {
            super.onChange(selfChange);
            AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
            System.out.println("currVolume:" + currentVolume);
            //TODO
        }
    }