Disable home, menu and back button in Lock-Screen Activity?

Question

I am working on Pattern Lock App. I want to Disable home, app switch menu and back buttons on lock-screen Activity actually These button are not disable in KitKat, Jelly Bean and other device all button disable instead of home button.

Answer 1

// 2.0 and above
@Override
public void onBackPressed() {
    //task to do in back button pressed
    //moveTaskToBack(true);
}

// Before 2.0
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        //task to do in back button pressed
        //moveTaskToBack(true);
        return true;
    }
    else if (keyCode == KeyEvent.KEYCODE_HOME) {
        //task to do in home button pressed
        return true;
    }

    else if ( keyCode == KeyEvent.KEYCODE_MENU ) {
        //task to do in menu button pressed
        return true;
    }
    return super.onKeyDown(keyCode, event);
}