Android - Volume Buttons Used in My Application

Android - Volume Buttons used in my application

You need to capture all actions:

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int action = event.getAction();
    int keyCode = event.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_VOLUME_UP:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        default:
            return super.dispatchKeyEvent(event);
        }
    }

How to override the behavior of the volume buttons in an Android application?

I imagine it looks something like this:

public boolean onKeyDown(int keyCode, KeyEvent event) 
{ 
   if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP) { 
       // Do your thing 
       return true;
   } else {
       return super.onKeyDown(keyCode, event); 
   }
}

How can i use the the physical volume button on the phone to change the volume of applications?

Call the following right before you start playing music

setVolumeControlStream(AudioManager.STREAM_MUSIC);

and call the following after you finish

setVolumeControlStream(AudioManager.USE_DEFAULT_STREAM_TYPE);

This makes your volume rocker control all music streams and then resets it to default behavior (depends on what's happening).

Don't forget to call myMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC) before myMediaPlayer.prepare(). Replace STREAM_MUSIC in both calls with some other value if it fits the played sound better. This makes the music you play conform to the music volume set in system, which is now controlled by the volume rocker.

Source:

http://developer.android.com/training/managing-audio/volume-playback.html

http://developer.android.com/reference/android/media/MediaPlayer.html#setAudioStreamType(int)

Start My App On Volume key Pressed when app is closed

You should use broadcast receiver for volume button press.

Register receiver in manifest file

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

and your broadcast activity look like this

public class CallBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {     
        Intent i = new Intent();
        i.setClassName("com.package", "com.package.MainActivity");
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);      
    }
}

Volume Control in android application

There was another question from a long time ago that asked the same thing. Essentially the answer is: don't override the onKeyDown and onKeyUp buttons. It's much better to simply use this one line setVolumeControlStream(AudioManager.STREAM_MUSIC); in your onCreate() method. That tells the OS that the volume buttons should affect the "media" volume when your application is visible, and that's the volume it uses for your application.

As for controlling the Media volume no matter what app is visible, I'm not sure that can be done - or if it could, whether that would be a good thing.

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