dialog 返回键问题

添加监听，使得返回，dialog不消失

DialogInterface.OnKeyListener keylistener= new DialogInterface.OnKeyListener() {

    public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {

        if (keyCode== KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {

            return true;

        } else {

            return false;

}

}

};

dialog.setOnKeyListener(keylistener);