I'm using the signup function of AWS' Amplify Auth in my Flutter app. The function is working fine when I run the code in Android Studio and test it on an emulator/phone. I'm able to add a new user to Cognito and verify the user.
But when I build the APK and try to run that APK on the same emulator/phone, the signup function is throwing some error in logcat and signup is not working as it was during debugging. I am not understanding why this error does not occur when I'm testing my code through Android Studio.
Here's the error:
2020-10-28 07:05:27.554 14035-14035/? E/MethodChannel#com.amazonaws.amplify/auth_cognito: Failed to handle method call
e.d: null cannot be cast to non-null type java.lang.reflect.Method
at com.amazonaws.amplify.amplify_auth_cognito.types.FlutterSignUpRequest.a(Unknown Source:203)
at com.amazonaws.amplify.amplify_auth_cognito.types.FlutterSignUpRequest.<init>(Unknown Source:96)
at com.amazonaws.amplify.amplify_auth_cognito.AuthCognito.i(Unknown Source:10)
at com.amazonaws.amplify.amplify_auth_cognito.AuthCognito.a(Unknown Source:150)
at d.a.b.a.j$a.a(Unknown Source:17)
at io.flutter.embedding.engine.e.b.a(Unknown Source:57)
at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(Unknown Source:4)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:336)
at android.os.Looper.loop(Looper.java:174)
at android.app.ActivityThread.main(ActivityThread.java:7397)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:935)
2020-10-28 07:05:27.556 14035-14063/? E/flutter: [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: NoSuchMethodError: The method 'forEach' was called on null.
Receiver: null
Tried calling: forEach(Closure: (dynamic, dynamic) => Set<Set<dynamic>>)
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51)
#1 AmplifyAuthCognitoMethodChannel._throwError (package:amplify_auth_cognito/method_channel_auth_cognito.dart:330)
#2 AmplifyAuthCognitoMethodChannel.signUp (package:amplify_auth_cognito/method_channel_auth_cognito.dart:40)
<asynchronous suspension>
#3 AmplifyAuthCognito.signUp (package:amplify_auth_cognito/amplify_auth_cognito.dart:45)
<asynchronous suspension>
#4 _State._registerUser (package:confab_app/SignUp_Screen.dart:36)
<asynchronous suspension>
Here's my code:
import 'package:flutter/material.dart';
import 'package:amplify_auth_cognito/amplify_auth_cognito.dart';
import 'package:amplify_core/amplify_core.dart';
class SignUpPage extends StatefulWidget {
@override
State<StatefulWidget> createState() => new _State();
}
class _State extends State<SignUpPage> {
bool isSignUpComplete = false;
TextEditingController nameController = TextEditingController();
TextEditingController passwordController = TextEditingController();
@override
void dispose() {
// Clean up the controller when the widget is removed from the
// widget tree.
nameController.dispose();
passwordController.dispose();
super.dispose();
}
void _registerUser() async
{
try {
Map<String, dynamic> userAttributes = {
"email": nameController.text,
// additional attributes as needed
};
SignUpResult res = await Amplify.Auth.signUp(
username: nameController.text.trim(),
password: passwordController.text.trim(),
options: CognitoSignUpOptions(
userAttributes: userAttributes
)
);
setState(() {
isSignUpComplete = res.isSignUpComplete;
});
navigateToConfirmPage(context);
} on AuthError catch (e) {
print(e);
}
}
