Current User

13min
Get current User on session
Introduction
It would not be enjoyable if the user had to log in every time they open your app. You can avoid this by using the cached current ParseUser object. Whenever you use any signup or login methods, the user is cached locally. You can manage this cache as a session, and automatically assume the user is logged in.
In this guide, you will learn how to use the Flutter plugin for Parse Server to get current User on session using ParseUser class for your Flutter App.
Goal
Get current User on session using Parse for a Flutter App.
Prerequisites
To complete this tutorial, you will need:
﻿Flutter version 2.2.x or later﻿
﻿Android Studio or VS Code installed (with Plugins Dart and Flutter)
A Flutter app created and connected to Back4App.
Note: Follow the Install Parse SDK on Flutter project to create an Flutter Project connected to Back4App.
Complete the previous guide so ou can have a better understanding of the ParseUser class.
A device (not Simulator) running Android or iOS.
Understanding the Get Current User App
To better understand the get current User on session process, we will create an app to signUp, login e logout a user. The application is similar to the previous guide, where we perform the signup, login, and logout. As we’re going to use the same project in the following guides, you can find some not yet available functions.
We won’t explain the Flutter application code once this guide’s primary focus is using the Flutter with Parse. Following the next steps, you will build a Login e Logout App at Back4App Database.
Let’s get started!
In the following steps, you will be able to build app a get current user.
- Create the Login/Logout App Template
Open your Flutter project from the previous guide Flutter plugin for Parse Server. Go to the main.dart file, clean up all the code, and replace it with:
Dart
 import 'package:flutter/material.dart';
 import 'package:parse_server_sdk_flutter/parse_server_sdk.dart';
3
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
6
   final keyApplicationId = 'YOUR_APP_ID_HERE';
   final keyClientKey = 'YOUR_CLIENT_KEY_HERE';
   final keyParseServerUrl = 'https://parseapi.back4app.com';
10
  await Parse().initialize(keyApplicationId, keyParseServerUrl,
      clientKey: keyClientKey,
      debug: true);
14
  runApp(MyApp());
}
17
class MyApp extends StatelessWidget {
  Future<bool> hasUserLogged() async {
    return Future.value(false);
  }
22
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter - Parse Server',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: FutureBuilder<bool>(
          future: hasUserLogged(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
              case ConnectionState.waiting:
                return Scaffold(
                  body: Center(
                    child: Container(
                        width: 100,
                        height: 100,
                        child: CircularProgressIndicator()),
                  ),
                );
              default:
                if (snapshot.hasData && snapshot.data!) {
                  return UserPage();
                } else {
                  return LoginPage();
                }
            }
          }),
    );
  }
}
56
class LoginPage extends StatefulWidget {
  @override
  _LoginPageState createState() => _LoginPageState();
}
61
class _LoginPageState extends State<LoginPage> {
  final controllerUsername = TextEditingController();
  final controllerPassword = TextEditingController();
  bool isLoggedIn = false;
66
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Flutter - Parse Server'),
        ),
        body: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(8),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Container(
                  height: 200,
                  child: Image.network(
                      'https://blog.back4app.com/wp-content/uploads/2017/11/logo-b4a-1-768x175-1.png'),
                ),
                Center(
                  child: const Text('Flutter on Back4App',
                      style:
                          TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                ),
                SizedBox(
                  height: 16,
                ),
                TextField(
                  controller: controllerUsername,
                  enabled: !isLoggedIn,
                  keyboardType: TextInputType.text,
                  textCapitalization: TextCapitalization.none,
                  autocorrect: false,
                  decoration: InputDecoration(
                      border: OutlineInputBorder(
                         borderSide: BorderSide(color: Colors.black)),
                     labelText: 'Username'),
               ),
               SizedBox(
                 height: 8,
               ),
               TextField(
                 controller: controllerPassword,
                 enabled: !isLoggedIn,
                 obscureText: true,
                 keyboardType: TextInputType.text,
                 textCapitalization: TextCapitalization.none,
                 autocorrect: false,
                 decoration: InputDecoration(
                     border: OutlineInputBorder(
                         borderSide: BorderSide(color: Colors.black)),
                     labelText: 'Password'),
               ),
               SizedBox(
                 height: 16,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Login'),
                   onPressed: isLoggedIn ? null : () => doUserLogin(),
                 ),
               ),
               SizedBox(
                 height: 16,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Sign Up'),
                   onPressed: () => navigateToSignUp(),
                 ),
               ),
               SizedBox( 
                 height: 16,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Reset Password'),
                   onPressed: () => navigateToResetPassword(),
                 ),
               )
             ),
          ),
        ),
      ));
}
153
void doUserLogin() async {
  final username = controllerUsername.text.trim();
  final password = controllerPassword.text.trim();
157
  final user = ParseUser(username, password, null);
159
  var response = await user.login();
161
  if (response.success) {
    navigateToUser();
  } else {
    Message.showError(context: context, message: response.error!.message);
  }
}
168
void navigateToUser() {
  Navigator.pushAndRemoveUntil(
    context,
    MaterialPageRoute(builder: (context) => UserPage()),
    (Route<dynamic> route) => false,
  );
}
176
void navigateToSignUp() {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => SignUpPage()),
  );
}
183
void navigateToResetPassword() {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => ResetPasswordPage()),
  );
}
}
191
class SignUpPage extends StatefulWidget {
@override
_SignUpPageState createState() => _SignUpPageState();
}
196
class _SignUpPageState extends State<SignUpPage> {
final controllerUsername = TextEditingController();
final controllerPassword = TextEditingController();
final controllerEmail = TextEditingController();
201
@override
Widget build(BuildContext context) {
  return Scaffold(
      appBar: AppBar(
        title: const Text('Flutter Sign Up'),
      ),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(8),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Container(
                height: 200,
                child: Image.network(
                    'https://blog.back4app.com/wp-content/uploads/2017/11/logo-b4a-1-768x175-1.png'),
              ),
              Center(
                child: const Text('Flutter on Back4App',
                    style:
                        TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
              ),
              SizedBox(
                height: 16,
              ),
              Center(
                child: const Text('User registration',
                    style: TextStyle(fontSize: 16)),
              ),
              SizedBox(
                height: 16,
              ),
              TextField(
                controller: controllerUsername,
                keyboardType: TextInputType.text,
                textCapitalization: TextCapitalization.none,
                autocorrect: false,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.black)),
                    labelText: 'Username'),
              ),
              SizedBox(
                height: 8,
              ),
              TextField(
                controller: controllerEmail,
                keyboardType: TextInputType.emailAddress,
                textCapitalization: TextCapitalization.none,
                autocorrect: false,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.black)),
                    labelText: 'E-mail'),
              ),
              SizedBox(
                height: 8,
              ),
              TextField(
                controller: controllerPassword,
                obscureText: true,
                keyboardType: TextInputType.text,
                textCapitalization: TextCapitalization.none,
                autocorrect: false,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.black)),
                    labelText: 'Password'),
              ),
              SizedBox(
                height: 8,
              ),
              Container(
                height: 50,
                child: ElevatedButton(
                  child: const Text('Sign Up'),
                  onPressed: () => doUserRegistration(),
                ),
              )
            ],
          ),
        ),
      ));
}
286
void doUserRegistration() async {
  final username = controllerUsername.text.trim();
  final email = controllerEmail.text.trim();
  final password = controllerPassword.text.trim();
291
  final user = ParseUser.createUser(username, password, email);
293
  var response = await user.signUp();
295
  if (response.success) {
    Message.showSuccess(
        context: context,
        message: 'User was successfully created!',
        onPressed: () async {
          Navigator.pushAndRemoveUntil(
            context,
            MaterialPageRoute(builder: (context) => UserPage()),
            (Route<dynamic> route) => false,
          );
        });
  } else {
    Message.showError(context: context, message: response.error!.message);
  }
}
}
312
class UserPage extends StatelessWidget {
ParseUser? currentUser;
315
Future<ParseUser?> getUser() async {
}
318
@override
Widget build(BuildContext context) {
  void doUserLogout() async {
    var response = await currentUser!.logout();
    if (response.success) {
      Message.showSuccess(
          context: context,
          message: 'User was successfully logout!',
          onPressed: () {
            Navigator.pushAndRemoveUntil(
              context,
              MaterialPageRoute(builder: (context) => LoginPage()),
              (Route<dynamic> route) => false,
            );
          });
    } else {
      Message.showError(context: context, message: response.error!.message);
    }
  }
338
  return Scaffold(
      appBar: AppBar(
        title: Text('User logged in - Current User'),
      ),
      body: FutureBuilder<ParseUser?>(
          future: getUser(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
              case ConnectionState.waiting:
                return Center(
                  child: Container(
                      width: 100,
                      height: 100,
                      child: CircularProgressIndicator()),
                );
              default:
                return Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Center(
                          child: Text('Hello, ${snapshot.data!.username}')),
                      SizedBox(
                        height: 16,
                      ),
                      Container(
                        height: 50,
                        child: ElevatedButton(
                          child: const Text('Logout'),
                          onPressed: () => doUserLogout(),
                        ),
                      ),
                    ],
                  ),
                );
            }
          }));
}
}
381
class ResetPasswordPage extends StatefulWidget {
@override
_ResetPasswordPageState createState() => _ResetPasswordPageState();
}
386
class _ResetPasswordPageState extends State<ResetPasswordPage> {
final controllerEmail = TextEditingController();
389
@override
Widget build(BuildContext context) {
  return Scaffold(
      appBar: AppBar(
        title: Text('Reset Password'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(8),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            TextField(
              controller: controllerEmail,
              keyboardType: TextInputType.emailAddress,
              textCapitalization: TextCapitalization.none,
              autocorrect: false,
              decoration: InputDecoration(
                  border: OutlineInputBorder(
                      borderSide: BorderSide(color: Colors.black)),
                  labelText: 'E-mail'),
            ),
            SizedBox(
              height: 8,
            ),
            Container(
              height: 50,
              child: ElevatedButton(
                child: const Text('Reset Password'),
                onPressed: () => doUserResetPassword(),
              ),
            )
          ],
        ),
      ));
}
425
void doUserResetPassword() async {}
}
428
class Message {
static void showSuccess(
    {required BuildContext context,
    required String message,
    VoidCallback? onPressed}) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: const Text("Success!"),
        content: Text(message),
        actions: <Widget>[
          new ElevatedButton(
            child: const Text("OK"),
            onPressed: () {
              Navigator.of(context).pop();
              if (onPressed != null) {
                onPressed();
              }
            },
          ),
        ],
      );
    },
  );
}
455
static void showError(
    {required BuildContext context,
    required String message,
    VoidCallback? onPressed}) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: const Text("Error!"),
        content: Text(message),
        actions: <Widget>[
          new ElevatedButton(
            child: const Text("OK"),
            onPressed: () {
              Navigator.of(context).pop();
              if (onPressed != null) {
                onPressed();
              }
            },
          ),
        ],
      );
    },
  );
}
}
482
 import 'package:flutter/material.dart';
 import 'package:parse_server_sdk_flutter/parse_server_sdk.dart';
3
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
6
   final keyApplicationId = 'YOUR_APP_ID_HERE';
   final keyClientKey = 'YOUR_CLIENT_KEY_HERE';
   final keyParseServerUrl = 'https://parseapi.back4app.com';
10
  await Parse().initialize(keyApplicationId, keyParseServerUrl,
      clientKey: keyClientKey,
      debug: true);
14
  runApp(MyApp());
}
17
class MyApp extends StatelessWidget {
  Future<bool> hasUserLogged() async {
    return Future.value(false);
  }
22
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter - Parse Server',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: FutureBuilder<bool>(
          future: hasUserLogged(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
              case ConnectionState.waiting:
                return Scaffold(
                  body: Center(
                    child: Container(
                        width: 100,
                        height: 100,
                        child: CircularProgressIndicator()),
                  ),
                );
              default:
                if (snapshot.hasData && snapshot.data!) {
                  return UserPage();
                } else {
                  return LoginPage();
                }
            }
          }),
    );
  }
}
56
class LoginPage extends StatefulWidget {
  @override
  _LoginPageState createState() => _LoginPageState();
}
61
class _LoginPageState extends State<LoginPage> {
  final controllerUsername = TextEditingController();
  final controllerPassword = TextEditingController();
  bool isLoggedIn = false;
66
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Flutter - Parse Server'),
        ),
        body: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(8),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Container(
                  height: 200,
                  child: Image.network(
                      'https://blog.back4app.com/wp-content/uploads/2017/11/logo-b4a-1-768x175-1.png'),
                ),
                Center(
                  child: const Text('Flutter on Back4App',
                      style:
                          TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                ),
                SizedBox(
                  height: 16,
                ),
                TextField(
                  controller: controllerUsername,
                  enabled: !isLoggedIn,
                  keyboardType: TextInputType.text,
                  textCapitalization: TextCapitalization.none,
                  autocorrect: false,
                  decoration: InputDecoration(
                      border: OutlineInputBorder(
                         borderSide: BorderSide(color: Colors.black)),
                     labelText: 'Username'),
               ),
               SizedBox(
                 height: 8,
               ),
               TextField(
                 controller: controllerPassword,
                 enabled: !isLoggedIn,
                 obscureText: true,
                 keyboardType: TextInputType.text,
                 textCapitalization: TextCapitalization.none,
                 autocorrect: false,
                 decoration: InputDecoration(
                     border: OutlineInputBorder(
                         borderSide: BorderSide(color: Colors.black)),
                     labelText: 'Password'),
               ),
               SizedBox(
                 height: 16,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Login'),
                   onPressed: isLoggedIn ? null : () => doUserLogin(),
                 ),
               ),
               SizedBox(
                 height: 16,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Sign Up'),
                   onPressed: () => navigateToSignUp(),
                 ),
               ),
               SizedBox( 
                 height: 16,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Reset Password'),
                   onPressed: () => navigateToResetPassword(),
                 ),
               )
             ),
          ),
        ),
      ));
}
153
void doUserLogin() async {
  final username = controllerUsername.text.trim();
  final password = controllerPassword.text.trim();
157
  final user = ParseUser(username, password, null);
159
  var response = await user.login();
161
  if (response.success) {
    navigateToUser();
  } else {
    Message.showError(context: context, message: response.error!.message);
  }
}
168
void navigateToUser() {
  Navigator.pushAndRemoveUntil(
    context,
    MaterialPageRoute(builder: (context) => UserPage()),
    (Route<dynamic> route) => false,
  );
}
176
void navigateToSignUp() {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => SignUpPage()),
  );
}
183
void navigateToResetPassword() {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => ResetPasswordPage()),
  );
}
}
191
class SignUpPage extends StatefulWidget {
@override
_SignUpPageState createState() => _SignUpPageState();
}
196
class _SignUpPageState extends State<SignUpPage> {
final controllerUsername = TextEditingController();
final controllerPassword = TextEditingController();
final controllerEmail = TextEditingController();
201
@override
Widget build(BuildContext context) {
  return Scaffold(
      appBar: AppBar(
        title: const Text('Flutter Sign Up'),
      ),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(8),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Container(
                height: 200,
                child: Image.network(
                    'https://blog.back4app.com/wp-content/uploads/2017/11/logo-b4a-1-768x175-1.png'),
              ),
              Center(
                child: const Text('Flutter on Back4App',
                    style:
                        TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
              ),
              SizedBox(
                height: 16,
              ),
              Center(
                child: const Text('User registration',
                    style: TextStyle(fontSize: 16)),
              ),
              SizedBox(
                height: 16,
              ),
              TextField(
                controller: controllerUsername,
                keyboardType: TextInputType.text,
                textCapitalization: TextCapitalization.none,
                autocorrect: false,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.black)),
                    labelText: 'Username'),
              ),
              SizedBox(
                height: 8,
              ),
              TextField(
                controller: controllerEmail,
                keyboardType: TextInputType.emailAddress,
                textCapitalization: TextCapitalization.none,
                autocorrect: false,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.black)),
                    labelText: 'E-mail'),
              ),
              SizedBox(
                height: 8,
              ),
              TextField(
                controller: controllerPassword,
                obscureText: true,
                keyboardType: TextInputType.text,
                textCapitalization: TextCapitalization.none,
                autocorrect: false,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.black)),
                    labelText: 'Password'),
              ),
              SizedBox(
                height: 8,
              ),
              Container(
                height: 50,
                child: ElevatedButton(
                  child: const Text('Sign Up'),
                  onPressed: () => doUserRegistration(),
                ),
              )
            ],
          ),
        ),
      ));
}
286
void doUserRegistration() async {
  final username = controllerUsername.text.trim();
  final email = controllerEmail.text.trim();
  final password = controllerPassword.text.trim();
291
  final user = ParseUser.createUser(username, password, email);
293
  var response = await user.signUp();
295
  if (response.success) {
    Message.showSuccess(
        context: context,
        message: 'User was successfully created!',
        onPressed: () async {
          Navigator.pushAndRemoveUntil(
            context,
            MaterialPageRoute(builder: (context) => UserPage()),
            (Route<dynamic> route) => false,
          );
        });
  } else {
    Message.showError(context: context, message: response.error!.message);
  }
}
}
312
class UserPage extends StatelessWidget {
ParseUser? currentUser;
315
Future<ParseUser?> getUser() async {
}
318
@override
Widget build(BuildContext context) {
  void doUserLogout() async {
    var response = await currentUser!.logout();
    if (response.success) {
      Message.showSuccess(
          context: context,
          message: 'User was successfully logout!',
          onPressed: () {
            Navigator.pushAndRemoveUntil(
              context,
              MaterialPageRoute(builder: (context) => LoginPage()),
              (Route<dynamic> route) => false,
            );
          });
    } else {
      Message.showError(context: context, message: response.error!.message);
    }
  }
338
  return Scaffold(
      appBar: AppBar(
        title: Text('User logged in - Current User'),
      ),
      body: FutureBuilder<ParseUser?>(
          future: getUser(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
              case ConnectionState.waiting:
                return Center(
                  child: Container(
                      width: 100,
                      height: 100,
                      child: CircularProgressIndicator()),
                );
              default:
                return Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Center(
                          child: Text('Hello, ${snapshot.data!.username}')),
                      SizedBox(
                        height: 16,
                      ),
                      Container(
                        height: 50,
                        child: ElevatedButton(
                          child: const Text('Logout'),
                          onPressed: () => doUserLogout(),
                        ),
                      ),
                    ],
                  ),
                );
            }
          }));
}
}
381
class ResetPasswordPage extends StatefulWidget {
@override
_ResetPasswordPageState createState() => _ResetPasswordPageState();
}
386
class _ResetPasswordPageState extends State<ResetPasswordPage> {
final controllerEmail = TextEditingController();
389
@override
Widget build(BuildContext context) {
  return Scaffold(
      appBar: AppBar(
        title: Text('Reset Password'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(8),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            TextField(
              controller: controllerEmail,
              keyboardType: TextInputType.emailAddress,
              textCapitalization: TextCapitalization.none,
              autocorrect: false,
              decoration: InputDecoration(
                  border: OutlineInputBorder(
                      borderSide: BorderSide(color: Colors.black)),
                  labelText: 'E-mail'),
            ),
            SizedBox(
              height: 8,
            ),
            Container(
              height: 50,
              child: ElevatedButton(
                child: const Text('Reset Password'),
                onPressed: () => doUserResetPassword(),
              ),
            )
          ],
        ),
      ));
}
425
void doUserResetPassword() async {}
}
428
class Message {
static void showSuccess(
    {required BuildContext context,
    required String message,
    VoidCallback? onPressed}) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: const Text("Success!"),
        content: Text(message),
        actions: <Widget>[
          new ElevatedButton(
            child: const Text("OK"),
            onPressed: () {
              Navigator.of(context).pop();
              if (onPressed != null) {
                onPressed();
              }
            },
          ),
        ],
      );
    },
  );
}
455
static void showError(
    {required BuildContext context,
    required String message,
    VoidCallback? onPressed}) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: const Text("Error!"),
        content: Text(message),
        actions: <Widget>[
          new ElevatedButton(
            child: const Text("OK"),
            onPressed: () {
              Navigator.of(context).pop();
              if (onPressed != null) {
                onPressed();
              }
            },
          ),
        ],
      );
    },
  );
}
}
482
﻿
When debug parameter in function Parse().initialize is true, allows displaying Parse API calls on the console. This configuration can help you debug the code. It is prudent to disable debug in the release version.
- Connect Template to Back4app Project
Find your Application Id and Client Key credentials navigating to your app Dashboard at Back4App Website.
Update your code in main.dart with the values of your project’s ApplicationId and ClientKey in Back4app.
keyApplicationId = App Id
keyClientKey = Client Key
Run the project, and the app will load as shown in the image.
﻿
- Code for get current user on Session
The User Login or SignUp function creates a Session object, which points to the User logged in and stores in your local storage a valid user session.
Calls to methods currentUser will successfully retrieve your ParseUser data and sessionToken for Session object.
Search for the function hasUserLogged in the file main.dart.
Replace the code inside hasUserLogged with:
JS
     ParseUser? currentUser = await ParseUser.currentUser() as ParseUser?;
     if (currentUser == null) {
       return false;
     }
     //Checks whether the user's session token is valid
     final ParseResponse? parseResponse =
         await ParseUser.getCurrentUserFromServer(currentUser.sessionToken!);
8
     if (parseResponse?.success == null || !parseResponse!.success) {
      //Invalid session. Logout
      await currentUser.logout();
      return false;
    } else {
      return true;
    }
     ParseUser? currentUser = await ParseUser.currentUser() as ParseUser?;
     if (currentUser == null) {
       return false;
     }
     //Checks whether the user's session token is valid
     final ParseResponse? parseResponse =
         await ParseUser.getCurrentUserFromServer(currentUser.sessionToken!);
8
     if (parseResponse?.success == null || !parseResponse!.success) {
      //Invalid session. Logout
      await currentUser.logout();
      return false;
    } else {
      return true;
    }
﻿
To build this function, follow these steps:
Call the ParseUser.currentUser() function, which will return a ParseUser object from local storage.
IfParseUser is null, we do not have any users with an active session in the app.
IfParseUser is not null, we have a user with an active session in our app.
The user’s session needs to be validated on the Parse Server, as it has a lifetime.
If the token is not valid, it is necessary to call the logout function to clear the current session and the user needs to log in again.
The complete function should look like this:
JS
   Future<bool> hasUserLogged() async {
     ParseUser? currentUser = await ParseUser.currentUser() as ParseUser?;
     if (currentUser == null) {
       return false;
     }
     //Checks whether the user's session token is valid
     final ParseResponse? parseResponse =
         await ParseUser.getCurrentUserFromServer(currentUser.sessionToken!);
 
    if (parseResponse?.success == null || !parseResponse!.success) {
      //Invalid session. Logout
      await currentUser.logout();
      return false;
    } else {
      return true;
    }
  }
   Future<bool> hasUserLogged() async {
     ParseUser? currentUser = await ParseUser.currentUser() as ParseUser?;
     if (currentUser == null) {
       return false;
     }
     //Checks whether the user's session token is valid
     final ParseResponse? parseResponse =
         await ParseUser.getCurrentUserFromServer(currentUser.sessionToken!);
 
    if (parseResponse?.success == null || !parseResponse!.success) {
      //Invalid session. Logout
      await currentUser.logout();
      return false;
    } else {
      return true;
    }
  }
﻿
Look for the function getUser in the file main.dart.
Replace the code inside getUser with:
Dart
  currentUser = await ParseUser.currentUser() as ParseUser?;
  return currentUser;
  currentUser = await ParseUser.currentUser() as ParseUser?;
  return currentUser;
﻿
To build this function, follow these steps:
Call the ParseUser.currentUser() function, which will return a ParseUser object from local storage.
The complete function should look like this:
Dart
   Future<ParseUser> getUser() async {
     currentUser = await ParseUser.currentUser() as ParseUser?;
     return currentUser;
   }
   Future<ParseUser> getUser() async {
     currentUser = await ParseUser.currentUser() as ParseUser?;
     return currentUser;
   }
﻿
To test it, click on theRunbutton in Android Studio/VSCode.
﻿
SignUp or Login and the next screen will display the username of the logged in user.
﻿
Quit the application and run again.
If a valid user session is identified, the screen with the user’s username will be displayed.
﻿
It’s done!
At the end of this guide, you can get current user on Session of your app using Parse Server core features through Back4App!
Updated 24 Jul 2024
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Reset Password
Query Users
Current User

Get current User on session

Introduction

Goal

Prerequisites

Understanding the Get Current User App

Let’s get started!

1 - Create the Login/Logout App Template

2 - Connect Template to Back4app Project

3 - Code for get current user on Session

It’s done!
