I was looking for a way to use sound controls on android to control remotely (from device) omxplayer running on raspberry pi:
Here is code how to do this easily on processing:
void keyPressed() {
if (key == CODED && keyCode ==
android.view.KeyEvent.KEYCODE_VOLUME_DOWN) {
println ("Volume down");
}
if (key == CODED && keyCode ==
android.view.KeyEvent.KEYCODE_VOLUME_UP) {
println ("Volume up");
}
}

