public class ByebyeDialogFragment extends DialogFragment {
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            // Use the Builder class for convenient dialog construction
            AlertDialog.Builder builderout = new AlertDialog.Builder(getActivity());
            builderout.setMessage(R.string.exitTimer)
                    .setPositiveButton(R.string.Yes, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id)
                      { finish();}
                    });
            builderout.setNegativeButton(R.string.No, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                }
            });
            return builderout.create();
        }
    }