private void createDialog() {
  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setTitle(getString(R.string.acq_select_hint));

  builder.setPositiveButton(getString(R.string.dialog_cancel), (dialog, which) -> onCancelClicked(dialog));

  builder.setCancelable(false);
  
  builder.setOnKeyListener((dialog, keyCode, event) -> {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
      onCancelClicked(dialog);
    }
    return false;
  });
  builder.create().show();
}

private void onCancelClicked(DialogInterface dialog) {
  setResult(100);
  finish();
  dialog.dismiss();
}