> **There is two methods**
1
@override public void onBackPressed(){ super.onBackPressed(); finish(); }
2
@Override public boolean onKeyDown(int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK)) { return false; } return super.onKeyDown(keyCode, event); }

Use onKeyDown to detect button click event. public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_MENU) { //do your work return true; } return super.onKeyDown(keyCode, event); }