How do you change the output volume of a sound?

问题

I'm using this code to play a sound.

I would like to give the user the ability to alter the volume of the sound. Can you tell me how to do this?

NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification();
notification.sound = Uri.parse("android.resource://emad/raw/quarter");

Thanks.

Truly, Emad

回答1:

use

  notification.audioStreamType = AudioManager.STREAM_MUSIC;

  context.setVolumeControlStream(AudioManager.STREAM_MUSIC);

来源：https://stackoverflow.com/questions/7337481/how-do-you-change-the-output-volume-of-a-sound