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Is it possible to register a listener to listen for changes in the volume level of the music stream in Android?
I'm displaying the actual volume in a SeekBar and I would like to change the seekbar if the user changes the volume with the hardware volume keys. At the moment the correct volume is displayed until the user changes the volume with hardware keys.
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By default, pressing the volume control modifies the volume of the active audio stream. If your app isn't currently playing anything, hitting the volume keys adjusts the music volume (or the ringer volume before Android 9). Unless your app is an alarm clock, you should play audio with usage AudioAttributes.
Under "Media volume," tap Play media to. When you press a volume button, the volume that changes depends on what you're doing. For example, if you're watching a movie, the movie volume changes. If you press your volume buttons when you're not listening to anything, your media volume changes.
This is not a perfect answer but a hack:
android.media.VOLUME_CHANGED_ACTION
I found above action in native logs while changing volume via hard volume key.
01-25 16:11:24.015: DEBUG/VolumePanel(189): onVolumeChanged(streamType: 2, flags: 4)
01-25 16:11:24.015: DEBUG/BluetoothA2dpService(189): Received intent with action: android.media.VOLUME_CHANGED_ACTION
so go ahead and register BroadcastReceiver with action "android.media.VOLUME_CHANGED_ACTION" if you don't have any other solution.
Other way of doing is; Taking over the volume key on Android .
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