In this tutorial we will display username of the user retrieved from PHP API in the app bar of the flutter application.

Step 1: Create a method to Fetch User Data From SharedPreferences in the Home Screen

Create the variable String userEmail = '';

 
// Method to retrieve user info from SharedPreferences
  Future<void> _getUserInfo() async {
    try {
      SharedPreferences prefs = await SharedPreferences.getInstance();
      String email = prefs.getString('email') ?? ''; // Get user email
      setState(() {
        userEmail = email;
        // Here you can retrieve and set other user information as needed
        print('===================');
        print(userEmail);
        print('===================');
      });
    } catch (error) {
      print('Error retrieving user info: $error');
    }
  }

Step 2: Call _getUserInfo() in the HomeScreen on Page Load

  @override
  void initState() {
    super.initState();
    fetchProductDataImages();
    _getUserInfo();
  }

Step 3: Display User Name in The App Bar

appBar: AppBar(
        backgroundColor: Colors.pink,
        title: Row(
          children: [
            Text('Hi $userEmail'),
            Text('Logout')
          ],
        ),
      ),

Step 4: Make Changes in PHP API to get User Name And User Id

// Verify user's password
        if ($user) {
            $response['success'] = true;
            $response['message'] = "Login successful.";
            $response['user_name'] = $user['user_name'];
            $response['user_id'] = $user['id'];
            // You can include additional data like user ID, name, etc. in the response if needed.
        }

Step 5: Store The User Name in Shared Preference in The Login Screen

 Future<void> _saveCredentials(String userName, int userId) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setString('email', _emailController.text);
    await prefs.setString('password', _passwordController.text);
    await prefs.setString('userName', userName);
    await prefs.setInt('userId', userId);
  }

Step 6: Call _saveCredentials Function in The Login Screen & Pass Necessary Values From The API

Future<void> _loginUser() async {
    String apiUrl = 'https://aboutassam.in/flutter_app/api/login.php';
    try {
      var response = await http.post(Uri.parse(apiUrl), body: {
        'user_email': _emailController.text,
        'user_password': _passwordController.text,
      });

      var responseData = json.decode(response.body);
      if (responseData['success']) {
        _saveCredentials(responseData['user_name'], responseData['user_id']);
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => Home(),
          ),
        );
        // Handle navigation or any other action
        print('Login successful');
      } else {
        // Login failed, show error message
        print('Login failed: ${responseData['message']}');
      }
    } catch (e) {
      print('Error logging in: $e');
    }
  }

// Use await _saveCredentials(responseData['user_name'], responseData['user_id']); if your code Does Not Work

Now replace email with username 🙂