Android: Hardware Menu button click event

The easiest way is to capture the onKeyDown event for the menu button click:

@Override

public boolean onKeyDown(int keycode, KeyEvent event ) {

 if(keycode == KeyEvent.KEYCODE_MENU)

{

  AlertDialog.Builder dialogBuilder

  = new AlertDialog.Builder(this)

  .setMessage("Test")

  .setTitle("Menu dialog");

  dialogBuilder.create().show();

 }

 return super.onKeyDown(keycode,event); 

}