Android监听音量变化

    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        }    }
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