How to disable android hardware buttons programmatically?

Question

I am developing android application with lock functionality. please suggest me how to disable all the hard keys programatically. here i am using beleow code to disable back button. i want like this functionality for all hard keys like home, menu button, Notification bar in android programmatically.

Answer 1

for back button (in activity or fragment)

@Override
    public void onBackPressed() {
}

Answer 2

  @Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

switch( event.getKeyCode() ) {

     case KeyEvent.KEYCODE_MENU:
         result = true;
        break;

    case KeyEvent.KEYCODE_VOLUME_UP:
         result = true;
        break;
    case KeyEvent.KEYCODE_VOLUME_DOWN:
        result = true;
        break;
    case KeyEvent.KEYCODE_BACK:
        result = true;
        break;
     default:
        result= super.dispatchKeyEvent(event);
        break;
 }

 return result;
}

and check this also