问Firebase电话身份验证:某些用户未收到动态口令

EN

import 'package:firebase_auth/firebase_auth.dart';  
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class Demo extends StatefulWidget {
  @override
  _DemoState createState() => _DemoState();
}

class _DemoState extends State<Demo> {
  TextEditingController _controller = TextEditingController();

Future<void> _showMyDialog() async {
return showDialog<void>(
  context: context,
  barrierDismissible: false, // user must tap button!
  builder: (BuildContext context) {
    return AlertDialog(
      title: Text('AlertDialog Title'),
      content: SingleChildScrollView(
        child: ListBody(
          children: <Widget>[
            Text('This is a demo alert dialog.'),
            TextField(
              controller: _controller,
            )
          ],
        ),
      ),
      actions: <Widget>[
        TextButton(
          child: Text('Approve'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ],
    );
  },
);
 }

  void sendOTP() async {
await FirebaseAuth.instance.verifyPhoneNumber(
  phoneNumber: "your number",
  verificationCompleted: (PhoneAuthCredential credential) async {
    print("verificationCompleted");
    await FirebaseAuth.instance.signInWithCredential(credential);
  },
  verificationFailed: (FirebaseAuthException e) {
    print("FirebaseAuthException");
    print(e.code);
  },
  codeSent: (String verificationID, int token) async {
    print("codeSent");
    await _showMyDialog();
    PhoneAuthCredential phoneAuthCredential = PhoneAuthProvider.credential(
        verificationId: verificationID, smsCode: _controller.text);
    await FirebaseAuth.instance.signInWithCredential(phoneAuthCredential);
    print("completed");
  },
  codeAutoRetrievalTimeout: (String verificationID) {
    print("$verificationID");
  },
  timeout: const Duration(seconds: 60),
);
 }

  @override
  Widget build(BuildContext context) {
return Scaffold(
  body: Center(
    child: FlatButton(
      child: Text(
          "send otp"),
      onPressed: sendOTP,
    ),
  ),
);
 }
}