点击按钮之后仍然显示对话框--Android

Android Dialog, keep dialog open when button is pressed?
目标：
如图

点击对话框中确定按钮之后需要判断输入是否为空，如果为空，显示toast，如果输入符合要求，那么dismiss掉对话框
参考链接：stackoverflow

代码如下：

final EditText etUserName = new EditText(context);        mChangeNameDialog = new AlertDialog.Builder(context)                .setTitle(ResourceUtils.getString(R.string.change_nick_name))                .setView(etUserName)                .setNegativeButton(ResourceUtils.getString(R.string.cancle), null)                .setPositiveButton(ResourceUtils.getString(R.string.ok), new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                    }                }).create();        mChangeNameDialog.show();        mChangeNameDialog.getButton(DialogInterface.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String userName = StringUtils.toStrValue(etUserName.getText());//判断是否为null或空字符                if (StringUtils.isBlank(userName)) {                    view.showToast(ResourceUtils.getString(R.string.please_input_nick_name));                    return;                }                //判断昵称是否含有空格                if (StringUtils.hasWhiteSpace(userName)) {                    view.showToast(ResourceUtils.getString(R.string.has_white_space));                    return;                }                dismissDialog();                //do something            }        });

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