public void onEndCallButtonPressed(EndCallButtonPressedEvent event) {
endCallButtonEventSource.fire(new EndCallButtonEvent());
}
});
event.getVolumneDownButtonPressedHandler().addVolumneDownButtonPressedHandler(new VolumeDownButtonPressedHandler() {
@Override
public void onVolumeDownButtonPressed(VolumeDownButtonPressedEvent event) {
volumeDownButtonEventSource.fire(new VolumeDownButtonEvent());
}
});