Android Example Capture volume keys events while app is in the background

Could some Java guru kindly convert the following codes into B4A code for me, if possible, please? I would greatly appreciate it!

I'm looking for a reliable solution as a background service to intercept volume key press events with screen off(just anything indicating key_press is enough for my app, either Up or Down key).
I've tried both intent based solution and BroadcastReceiver approach, and neither of them meets my need.

I found the following Java code on StackOverflow website.

Java code for detecting volume key press with screen off:
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.v4.media.VolumeProviderCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;

public class PlayerService extends Service {
    private MediaSessionCompat mediaSession;

    [USER=69643]@override[/USER]
    public void onCreate() {
        super.onCreate();
        mediaSession = new MediaSessionCompat(this, "PlayerService");
        mediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
                MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
        mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
                .setState(PlaybackStateCompat.STATE_PLAYING, 0, 0) //you simulate a player which plays something.
                .build());

        //this will only work on Lollipop and up, see https://code.google.com/p/android/issues/detail?id=224134
        VolumeProviderCompat myVolumeProvider =
                new VolumeProviderCompat(VolumeProviderCompat.VOLUME_CONTROL_RELATIVE, /*max volume*/100, /*initial volume level*/50) {
            [USER=69643]@override[/USER]
            public void onAdjustVolume(int direction) {
                /*
                -1 -- volume down
                1 -- volume up
                0 -- volume button released
                 */
            }
        };

        mediaSession.setPlaybackToRemote(myVolumeProvider);
        mediaSession.setActive(true);
    }


    [USER=69643]@override[/USER]
    public IBinder onBind(Intent intent) {
        return null;
    }

    [USER=69643]@override[/USER]
    public void onDestroy() {
        super.onDestroy();
        mediaSession.release();
    }
}

manifest entry:
<application ...>
    ...
    <service android:name=".PlayerService"/>
</application>

code in Activity:
[USER=69643]@override[/USER]
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    startService(new Intent(this, PlayerService.class));
}


TIA
 

toby

Active Member
Licensed User
See the attached project.

Note that this is Android 5+ (minSdkVersion=21).

Thank you very much for translating for me that piece of java code which is Greek to me! To show my appreciation, I just contributed $100USD.
 
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