Android How to listen for Volume Button events?

Question

I know you guys are probably tired of these kinds of posts, but why doesn\'t anything happen when I press volume down? I\'m just trying to make a simple code, but apparently

Answer 1

use this code to handle Volume key event

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    super.onKeyUp(keyCode, event);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_UP)
    {
        Toast.makeText(MainActivity.this,"Up working",Toast.LENGTH_SHORT).show();
        return true;
    }
    return false;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    super.onKeyDown(keyCode, event);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)
    {
        Toast.makeText(MainActivity.this,"Down working",Toast.LENGTH_SHORT).show();
        return true;
    }
    return false;
}