Get user data with Rest API in Flutter

Question

I created a function using rest API to get one user data:

code:

  Future<User> getUser(int id) async{
    final response = await client.get('$baseUrl/user/$id');
    if(response.statusCode == 200){
      return userFromJson(response.body);
    }else return null;
  }

I must get data from user which is current logged in to this sytem, so I get his id from response with using sharedPreferences:

sharedPreferences.setInt("id", jsonResponse['id']);

but i don't know how to create an FutureBuilder which would insert the appropriate id into my rest api function,

I try this:

class _HomeScreenState extends State<HomeScreen> {
  BuildContext context;
  ApiService apiService;
  SharedPreferences sharedPreferences;

  @override
  void initState() {
    super.initState();
    apiService = ApiService();
  }

  checkStorageStatus() async {
    sharedPreferences = await SharedPreferences.getInstance();
  }

  @override
  Widget build(BuildContext context) {
    this.context = context;
    return SafeArea(
      child: FutureBuilder(
        future: apiService.getProfiles(), //I DON'T KNOW HOW TO PUT ID INTO THI FUNCTION
        builder: (BuildContext context, AsyncSnapshot<List<Profile>> snapshot) {
          if (snapshot.hasError) {
            return Center(
              child: Text(
                  "Something wrong with message: ${snapshot.error.toString()}"),
            );
          } else if (snapshot.connectionState == ConnectionState.done) {
            User user = snapshot.data;
            return _buildListView(user);
          } else {
            return Center(
              child: CircularProgressIndicator(),
            );
          }
        },
      ),
    );
  }

but i can't put my ID into apiService.getProfiles() function, can anybody help me?

thanks for any help :)

Answer 1

class _HomeScreenState extends State<HomeScreen> {
  BuildContext context;
  ApiService apiService;
  SharedPreferences sharedPreferences;

  @override
  void initState() {
    super.initState();
    apiService = ApiService();
    fetchUser();
  }

  Future<List<Profile>> fetchUser() async {
    sharedPreferences = await SharedPreferences.getInstance();
    int id = sharedPreferences.getInt("id");
    final response = await client.get('$baseUrl/user/$id');
    if(response.statusCode == 200){
      return userFromJson(response.body);
    }else return null;
  }


  @override
  Widget build(BuildContext context) {
    this.context = context;
    return SafeArea(
      child: FutureBuilder(
        future: fetchUser(),
        builder: (BuildContext context, AsyncSnapshot<List<Profile>> snapshot) {
          if (snapshot.hasError) {
            return Center(
              child: Text(
                  "Something wrong with message: ${snapshot.error.toString()}"),
            );
          } else if (snapshot.connectionState == ConnectionState.done) {
            User user = snapshot.data;
            return _buildListView(user);
          } else {
            return Center(
              child: CircularProgressIndicator(),
            );
          }
        },
      ),
    );
  }
}

Answer 2

In your apiService.getProfiles() you get the id from SharedPreferences before performing your API request

getProfiles(){
  SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
  int id = sharedPreferences.getInt("id");
  // perform http request to get UserProfile
}