如何防止在选择项目时关闭对话框

I have a dialog with items:

我有一个项目对话框:

final String[] items = new String[] { "item1", "item2" };

AlertDialog.Builder adb = new AlertDialog.Builder(this).setTitle("Title");
adb.setCancelable(false);
adb.setItems(items, new OnClickListener() {

    @Override
    public void onClick(DialogInterface d, int n) {
        Toast.makeText(MainActivity.this, items[n], Toast.LENGTH_LONG).show();
    });
}

AlertDialog alert = adb.create();
alert.setCancelable(false);
alert.show();
fina