質問編集履歴
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情報が不足していました。
test
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FlutterでFirebase
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FlutterでFirebaseを使ってID、PWによるログイン処理を実装しています。
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そこで、ログインはうまくいくのですが、ログアウトしてログインページに戻ったあとに再ログインできないという事象に悩まされています。
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基本的には、[こちら](
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基本的には、[こちら](https://ayusch.com/flutter-firebase-authentication-tutorial/)を参考に実装しています。
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エラーです。
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```
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ソースです。★をつけた箇所がデバッグした結果、怪しいと感じた箇所です。
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### main.dart
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import 'authentication.dart';
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```
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void main() {
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// 省略
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}
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@@ -96,155 +88,559 @@
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class MyApp extends StatelessWidget {
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Widget build(BuildContext context) {
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return MaterialApp(
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// 省略,
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home: RootPage(auth: Auth()));
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}
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}
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```
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### root_page.dart
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```
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class RootPage extends StatefulWidget {
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RootPage({this.auth});
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//★authインスタンスは重複していないか
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final BaseAuth auth;
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State<StatefulWidget> createState() => _RootPageState();
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}
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class _RootPageState extends State<RootPage> {
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AuthStatus authStatus = AuthStatus.NOT_DETERMINED;
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String _userId = "";
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void initState() {
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super.initState();
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widget.auth.getCurrentUser().then((user) {
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setState(() {
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if (user != null) {
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_userId = user?.uid;
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}
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authStatus =
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user?.uid == null ? AuthStatus.NOT_LOGGED_IN : AuthStatus.LOGGED_IN;
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});
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});
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}
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void loginCallback() {
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// 省略
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}
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//★本処理は適切に呼ばれているか
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void logoutCallback() {
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setState(() {
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authStatus = AuthStatus.NOT_LOGGED_IN;
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_userId = "";
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});
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}
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Widget buildWaitingScreen() {
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return Scaffold(
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// 省略
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);
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}
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Widget build(BuildContext context) {
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switch (authStatus) {
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case AuthStatus.NOT_DETERMINED:
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return buildWaitingScreen();
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break;
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case AuthStatus.NOT_LOGGED_IN:
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return LoginSignupPage(
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auth: widget.auth,
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loginCallback: loginCallback,
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);
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break;
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case AuthStatus.LOGGED_IN:
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if (_userId.length > 0 && _userId != null) {
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return HomePage(
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userId: _userId,
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auth: widget.auth,
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logoutCallback: logoutCallback,
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);
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} else
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return buildWaitingScreen();
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break;
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default:
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return buildWaitingScreen();
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}
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}
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}
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```
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### login_signup_page.dart
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```
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class LoginSignupPage extends StatefulWidget {
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LoginSignupPage({this.auth, this.loginCallback});
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final BaseAuth auth;
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final VoidCallback loginCallback;
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State<StatefulWidget> createState() => _LoginSignupPageState();
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}
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class _LoginSignupPageState extends State<LoginSignupPage> {
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final _formKey = GlobalKey<FormState>();
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String _groupId;
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String _displayName;
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String _email;
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String _password;
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String _errorMessage;
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bool _isLoginForm;
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bool _isLoading;
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bool validateAndSave() {
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final form = _formKey.currentState;
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if (form.validate()) {
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form.save();
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return true;
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}
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return false;
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}
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void validateAndSubmit() async {
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setState(() {
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_errorMessage = "";
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_isLoading = true;
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});
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if (validateAndSave()) {
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String userId = "";
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try {
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if (_isLoginForm) {
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//★このtry文でエラーが発生しているように見える
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userId = await widget.auth.signIn(_email, _password);
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} else {
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userId = await widget.auth.signUp(_email, _password);
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Firestore.instance.collection('users').document(userId).setData({
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// 省略
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});
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widget.auth.sendEmailVerification();
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_showVerifyEmailSentDialog();
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}
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setState(() {
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_isLoading = false;
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});
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if (userId.length > 0 && userId != null && _isLoginForm) {
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widget.loginCallback();
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}
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} catch (e) {
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//★ここでeがnullになっていることが原因?
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setState(() {
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_isLoading = false;
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_errorMessage = e.message;
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_formKey.currentState.reset();
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});
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}
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}
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}
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@override
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void initState() {
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_errorMessage = "";
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_isLoading = false;
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_isLoginForm = true;
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super.initState();
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}
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void resetForm() {
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// 省略
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}
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405
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void toggleFormMode() {
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// 省略
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}
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Widget build(BuildContext context) {
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return
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return Scaffold(
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// 省略
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-
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theme: ThemeData(
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primarySwatch: Colors.blue,
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)
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);
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}
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}
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// 省略
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}
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}
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```
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```
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### homepage.dart
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126
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127
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434
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128
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129
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import 'authentication.dart';
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131
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import 'homepage.dart';
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import 'login_signup_page.dart';
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135
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136
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137
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enum AuthStatus {
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139
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NOT_DETERMINED,
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140
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141
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NOT_LOGGED_IN,
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142
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143
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LOGGED_IN,
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144
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-
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145
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-
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435
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```
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146
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148
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-
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436
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149
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class
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437
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class HomePage extends StatelessWidget {
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438
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150
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|
439
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HomePage(
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440
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441
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{Key key, this.auth, this.onSignedOut, this.userId, this.logoutCallback})
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442
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151
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: super(key: key);
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153
445
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154
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155
447
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final BaseAuth auth;
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156
448
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157
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449
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final VoidCallback onSignedOut;
|
450
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+
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158
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|
451
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final VoidCallback logoutCallback;
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452
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|
453
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final String userId;
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454
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|
455
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+
|
456
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+
|
457
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Widget build(BuildContext context) {
|
458
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+
|
459
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//★TODO: 認証情報等をすべて引数で下位Widgetに渡している箇所はProviderでリファクタリングする
|
460
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+
|
461
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return MaterialApp(
|
462
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+
|
159
|
-
|
463
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home: MyHomePage(
|
464
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|
160
|
-
|
465
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+
title: 'title',
|
466
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467
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auth: this.auth,
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468
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|
469
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onSignedOut: this.onSignedOut,
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470
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+
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471
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logoutCallback: this.logoutCallback,
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472
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473
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userId: this.userId),
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474
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+
|
475
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+
routes: <String, WidgetBuilder>{
|
476
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+
|
161
|
-
|
477
|
+
'/login_signup': (BuildContext context) => LoginSignupPage(),
|
478
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+
|
162
|
-
|
479
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});
|
480
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+
|
163
|
-
}
|
481
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+
}
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482
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+
|
164
|
-
|
483
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+
}
|
484
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+
|
485
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+
|
486
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+
|
165
|
-
|
487
|
+
class MyHomePage extends StatefulWidget {
|
488
|
+
|
166
|
-
|
489
|
+
MyHomePage(
|
490
|
+
|
491
|
+
{Key key,
|
492
|
+
|
493
|
+
this.title,
|
494
|
+
|
495
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+
this.auth,
|
496
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+
|
497
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+
this.onSignedOut,
|
498
|
+
|
499
|
+
this.logoutCallback,
|
500
|
+
|
501
|
+
this.userId})
|
502
|
+
|
503
|
+
: super(key: key);
|
504
|
+
|
505
|
+
|
506
|
+
|
507
|
+
final String title;
|
508
|
+
|
509
|
+
final BaseAuth auth;
|
510
|
+
|
511
|
+
final VoidCallback logoutCallback;
|
512
|
+
|
513
|
+
final String userId;
|
514
|
+
|
515
|
+
final VoidCallback onSignedOut;
|
516
|
+
|
517
|
+
|
518
|
+
|
519
|
+
_MyHomePageState createState() => _MyHomePageState(
|
520
|
+
|
521
|
+
auth: this.auth, onSignedOut: this.onSignedOut, userId: this.userId);
|
522
|
+
|
523
|
+
}
|
524
|
+
|
525
|
+
|
526
|
+
|
167
|
-
class _
|
527
|
+
class _MyHomePageState extends State<MyHomePage> {
|
168
|
-
|
528
|
+
|
169
|
-
|
529
|
+
FirebaseUser user;
|
170
|
-
|
530
|
+
|
171
|
-
|
531
|
+
final BaseAuth auth;
|
532
|
+
|
172
|
-
|
533
|
+
final logoutCallback;
|
534
|
+
|
173
|
-
|
535
|
+
final VoidCallback onSignedOut;
|
174
|
-
|
536
|
+
|
537
|
+
|
538
|
+
|
175
|
-
|
539
|
+
_MyHomePageState(
|
540
|
+
|
541
|
+
{this.auth, this.onSignedOut, this.logoutCallback, this.userId});
|
542
|
+
|
543
|
+
|
176
544
|
|
177
545
|
void initState() {
|
178
546
|
|
179
547
|
super.initState();
|
180
548
|
|
549
|
+
|
550
|
+
|
181
|
-
|
551
|
+
initUser() async {
|
182
|
-
|
552
|
+
|
183
|
-
|
553
|
+
setState(() {});
|
184
|
-
|
185
|
-
|
554
|
+
|
186
|
-
|
187
|
-
_userId = user?.uid;
|
188
|
-
|
189
|
-
|
555
|
+
}
|
556
|
+
|
557
|
+
|
558
|
+
|
190
|
-
|
559
|
+
final String userId;
|
560
|
+
|
561
|
+
String displayName = '名無し';
|
562
|
+
|
563
|
+
|
564
|
+
|
565
|
+
Widget build(BuildContext context) {
|
566
|
+
|
567
|
+
Firestore.instance
|
568
|
+
|
569
|
+
.collection('users')
|
570
|
+
|
571
|
+
.document(userId)
|
572
|
+
|
573
|
+
.get()
|
574
|
+
|
191
|
-
|
575
|
+
.then((onValue) {
|
192
|
-
|
576
|
+
|
193
|
-
|
577
|
+
displayName = onValue.data['displayName'].toString();
|
194
|
-
|
195
|
-
});
|
196
578
|
|
197
579
|
});
|
198
580
|
|
199
|
-
|
581
|
+
|
200
|
-
|
201
|
-
|
202
|
-
|
203
|
-
void loginCallback() {
|
204
|
-
|
205
|
-
widget.auth.getCurrentUser().then((user) {
|
206
|
-
|
207
|
-
setState(() {
|
208
|
-
|
209
|
-
_userId = user.uid.toString();
|
210
|
-
|
211
|
-
});
|
212
|
-
|
213
|
-
});
|
214
|
-
|
215
|
-
setState(() {
|
216
|
-
|
217
|
-
authStatus = AuthStatus.LOGGED_IN;
|
218
|
-
|
219
|
-
});
|
220
|
-
|
221
|
-
}
|
222
|
-
|
223
|
-
|
224
|
-
|
225
|
-
void logoutCallback() {
|
226
|
-
|
227
|
-
setState(() {
|
228
|
-
|
229
|
-
authStatus = AuthStatus.NOT_LOGGED_IN;
|
230
|
-
|
231
|
-
_userId = "";
|
232
|
-
|
233
|
-
});
|
234
|
-
|
235
|
-
}
|
236
|
-
|
237
|
-
|
238
|
-
|
239
|
-
Widget buildWaitingScreen() {
|
240
582
|
|
241
583
|
return Scaffold(
|
242
584
|
|
585
|
+
appBar: Header(),
|
586
|
+
|
243
|
-
body: Con
|
587
|
+
body: Column(
|
244
|
-
|
588
|
+
|
245
|
-
|
589
|
+
children: <Widget>[
|
590
|
+
|
246
|
-
|
591
|
+
Expanded(
|
592
|
+
|
593
|
+
flex: 0,
|
594
|
+
|
595
|
+
child: Row(
|
596
|
+
|
247
|
-
child:
|
597
|
+
children: <Widget>[
|
598
|
+
|
599
|
+
// 省略
|
600
|
+
|
601
|
+
Expanded(
|
602
|
+
|
603
|
+
flex: 1,
|
604
|
+
|
605
|
+
child: FlatButton(
|
606
|
+
|
607
|
+
// 省略
|
608
|
+
|
609
|
+
onPressed: () async {
|
610
|
+
|
611
|
+
try {
|
612
|
+
|
613
|
+
//★logoutCallbackが呼べていない?
|
614
|
+
|
615
|
+
await widget.auth.signOut();
|
616
|
+
|
617
|
+
widget.logoutCallback;
|
618
|
+
|
619
|
+
} catch (e) {
|
620
|
+
|
621
|
+
}
|
622
|
+
|
623
|
+
//★ここも怪しい
|
624
|
+
|
625
|
+
Navigator.of(context)
|
626
|
+
|
627
|
+
.pushReplacementNamed('/login_signup');
|
628
|
+
|
629
|
+
},
|
630
|
+
|
631
|
+
),
|
632
|
+
|
633
|
+
)
|
634
|
+
|
635
|
+
],
|
636
|
+
|
637
|
+
),
|
638
|
+
|
639
|
+
),
|
640
|
+
|
641
|
+
// 省略
|
642
|
+
|
643
|
+
],
|
248
644
|
|
249
645
|
),
|
250
646
|
|
@@ -252,60 +648,6 @@
|
|
252
648
|
|
253
649
|
}
|
254
650
|
|
255
|
-
|
256
|
-
|
257
|
-
@override
|
258
|
-
|
259
|
-
Widget build(BuildContext context) {
|
260
|
-
|
261
|
-
switch (authStatus) {
|
262
|
-
|
263
|
-
case AuthStatus.NOT_DETERMINED:
|
264
|
-
|
265
|
-
return buildWaitingScreen();
|
266
|
-
|
267
|
-
break;
|
268
|
-
|
269
|
-
case AuthStatus.NOT_LOGGED_IN:
|
270
|
-
|
271
|
-
return LoginSignupPage(
|
272
|
-
|
273
|
-
auth: widget.auth,
|
274
|
-
|
275
|
-
loginCallback: loginCallback,
|
276
|
-
|
277
|
-
);
|
278
|
-
|
279
|
-
break;
|
280
|
-
|
281
|
-
case AuthStatus.LOGGED_IN:
|
282
|
-
|
283
|
-
if (_userId.length > 0 && _userId != null) {
|
284
|
-
|
285
|
-
return HomePage(
|
286
|
-
|
287
|
-
userId: _userId,
|
288
|
-
|
289
|
-
auth: widget.auth,
|
290
|
-
|
291
|
-
logoutCallback: logoutCallback,
|
292
|
-
|
293
|
-
);
|
294
|
-
|
295
|
-
} else
|
296
|
-
|
297
|
-
return buildWaitingScreen();
|
298
|
-
|
299
|
-
break;
|
300
|
-
|
301
|
-
default:
|
302
|
-
|
303
|
-
return buildWaitingScreen();
|
304
|
-
|
305
|
-
|
651
|
+
}
|
306
|
-
|
307
|
-
|
652
|
+
|
308
|
-
|
309
|
-
}
|
310
|
-
|
311
|
-
```
|
653
|
+
```
|