androidandroid-mediaplayerandroid-audiomanager

How to convert Android stream volume to a value between 0 and 1

I am using a MediaPlayer to play sound and I want to take the current stream's volume and set it as the volume for the media player with it setVolume method.

The issue is that if I take the value of the volume like this:

audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

The value I receive is an index of the volume, while the setSound method expects a value between 0 and 1.

How do I convert the index to a value between 0 and 1?

Solution

  • Simply divide the current volume index by the max volume index of the stream

    int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

float desiredValue = currentVolume / (float) maxVolume;

    you can then use that value as you wish (it is beetween 0 and 1)