如何在FLUTTER中关闭没有按钮的警报对话框 [英] How to close an Alert dialog without a button in FLUTTER

问题描述

我想在用户按下登录按钮时显示一个圆圈指示器.但是有时可能会发生错误，例如错误的电子邮件或错误的密码.在这种情况下，圆形指示器应停止并显示错误消息.圆圈指示器警报对话框中没有按钮.我希望它在发现错误时自动关闭

I want to show a circle indicator when the user presses the login button. But sometimes an error can occur such as a Wrong email or wrong password. In that case, the circle indicator should be stopped and the error message should be shown. There is no button in circle indicator alert dialog. I want it to automatically close when an error found

onPressed: () async {
                      AuthResult user;
                      progressIndi();

                      try {
                        user = await _auth.signInWithEmailAndPassword(email: email, password: pass);
                      } catch (err) {
                        finderror(err.code);
                      }

finderror 功能将找到要显示的错误消息. progressIndi()函数将显示警报对话框.我试图用堆栈来实现它.但是，只有当我关闭对话框并再次按下登录按钮时，它才会显示更改.

finderror function will find the error message to show. progressIndi() function will show the alert dialog. I tried to implement it with stacks. But it's only showing changes when I close the dialog box and press the login button again.

void progressIndi() {
showDialog(
  barrierDismissible: false,
  context: context,
  builder: (BuildContext context) {
    return IndexedStack(
      index: isError,
      children: <Widget>[

        AlertDialog(
          content: new Row(
            children: [
              CircularProgressIndicator(),
              Container(
                  margin: EdgeInsets.only(left: 5),
                  child: Text(" Loading")),
            ],
          ),
        ),

        AlertDialog(
          title: Text("Error Found"),
          content: Text(errorMessage),
          actions: <Widget>[
            // usually buttons at the bottom of the dialog
            new FlatButton(
              child: new Text("Try Again"),
              onPressed: () {
                Navigator.of(context).pop();
                isError = 0;
              },
            ),
          ],
        ),
      ],
    );
  },
);

}

我知道可以使用按钮和Navigator.of(context).pop()关闭警报对话框. 拜托，任何人，请给我一个提示，可以不使用按钮从外部关闭警报对话框.

I know that alert dialog can be closed using the button and Navigator.of(context).pop() . Please, anyone, give me a hint to close the alert dialog from outside without a button.

推荐答案

发生异常后，可以通过在异常发生后立即调用Navigator.of(context).pop()来删除对话框，然后显示另一个错误对话框.希望这会有所帮助.

You can remove the dialog when an error occurs by calling Navigator.of(context).pop() just after the exception occurs and then show another dialog for error. Hope this helps.

  AuthResult user;
                      progressIndi();

                      try {
                        user = await _auth.signInWithEmailAndPassword(email: email, password: pass);
                      } catch (err) {
//Use pop here.
                        Navigator.of(context).pop();
//make findError open another dialog.
                        finderror(err.code);
                      }

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