Listen to volume changes events on Android

Better, you can register a ContentObserver as follows:

  getApplicationContext().getContentResolver().registerContentObserver(android.provider.Settings.System.CONTENT_URI, true, new ContentObserver(){...} );

Your ContentObserver might look like this:

public class SettingsContentObserver extends ContentObserver {    private AudioManager audioManager;    public SettingsContentObserver(Context context, Handler handler) {        super(handler);        audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);    }    @Override    public boolean deliverSelfNotifications() {        return false;    }    @Override    public void onChange(boolean selfChange) {        int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);        Log.d(TAG, "Volume now " + currentVolume);    }}

When done:

getApplicationContext().getContentResolver().unregisterContentObserver(mContentObserver);

One caution, though - sometimes the notifications seem to be delayed if there are lots of button presses quickly.

ok , for now , what i do is to listen to the volume buttons using onKeyDown (and check for KEYCODE_VOLUME_DOWN,KEYCODE_VOLUME_MUTE,KEYCODE_VOLUME_UP ) , and using a handler i've posted a new runnable that checks the volume level .

also , since some devices have a volume dialog , i've added a listener to when it is being disappeared , according to this link.

Use broadcast receiver VOLUME_CHANGED_ACTION then use AudioManager to obtain current volume.

<receiver android:name="VolumeChangeReceiver" >    <intent-filter>         <action android:name="android.media.VOLUME_CHANGED_ACTION" />    </intent-filter></receiver>