How to quit android application programmatically

Question

I Found some codes for quit an Android application programatically. By calling any one of the following code in onDestroy() will it quit application entirely?

Answer 1

We want code that is robust and simple. This solution works on old devices and newer devices.

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        getActivity().finishAffinity();
    } else{
        getActivity().finish();
        System.exit( 0 );
    }