Flutter, how to get data array of object and show to ListView.builder?

Question

im new in flutter and i want to get my data from localhost phpmydmin. here is my json:

{
    "status": true,
    "message": "Data ditemukan",
    "data": [
        {
            "id": "1",
            "username": "admin",
            "password": "d033e22ae348aeb5660fc2140aec35850c4da997",
            "nama": "admin",
            "token": "2a5c97cb31308b8d818da33a041fa47d"
        },
        {
            "id": "3",
            "username": "sani",
            "password": "86862f0600c8b9829d9ca9c8aaca3f0727b44b6e",
            "nama": "Sani Sandhika",
            "token": "661e23835d27f9d45cf371f59533f163"
        },
        {
            "id": "4",
            "username": "seno",
            "password": "d61a4fe61485d6437b698c11635d8fb8c5b79d2f",
            "nama": "Seno",
            "token": "7b9f0f54ca01c323bc810206adcaa38c"
        },
        {
            "id": "5",
            "username": "username",
            "password": "5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8",
            "nama": "nama",
            "token": null
        }
    ]
}

and here is my UserModel:

import 'dart:convert';

List<User> allUsers(String str) {
  final jsonData = json.decode(str);
  return new List<User>.from(jsonData.map((x) => User.fromJson(x)));
}

class User {
  bool status;
  String message;
  List<Data> data;

  User({
    this.status,
    this.message,
    this.data,
  });

  factory User.fromJson(Map<String, dynamic> parsedJson) {
    var list = parsedJson['data'] as List;
    print(list.runtimeType);
    List<Data> dataList = list.map((i) => Data.fromJson(i)).toList();

    return User(
      status: parsedJson['status'],
      message: parsedJson['message'],
      data: dataList,
    );
  }
}

class Data {
  final int id;
  final String nama;
  final String username;

  Data({
    this.id,
    this.nama,
    this.username,
  });

  factory Data.fromJson(Map<String, dynamic> parsedJson) {
    return Data(
      id: parsedJson['id'],
      nama: parsedJson['nama'],
      username: parsedJson['username'],
    );
  }
}

this is my RestApi:

import 'package:flutter_rest_api_crud/models/models.dart';

import 'package:http/http.dart' as http;

class RestApi {
  String url = 'http://192.168.1.5/gizi/user/';

  Future<List<User>> getUsers() async {
    final response = await http.get('$url/user');
    print(response.body);
    return allUsers(response.body);
  }
}

and last here is my HomeScreen:

import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';

class HomeScreen extends StatefulWidget {
  HomeScreen({Key key}) : super(key: key);

  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
    );
  }
}

And i want to get my data inside "data" from localhost phpmyadmin. and put it on ListView.builder. and i don't know what the next step to implement the listview to my homescreen. anyone can help me ?

Stefano Amorelli · Accepted Answer · 2020-12-10 14:16:01Z

You can hit the API endpoint after initializing the Widget:

 List<User> _users = [];
  @override
  void initState() {
    super.initState();
    _load();
  }

  void _load() async {
    List<User> users =
        await RestApi.getUsers(); // load the users on Widget init
    setState(() => _users = users);
  }

Then display a nested ListView to display each User's Data:

    return Scaffold(
      appBar: AppBar(),
      body: new ListView.builder(
        itemCount: _users.length,
        itemBuilder: (BuildContext ctxt, int i) {
          return new Card(
            child: Column(
              children: [
                Text(_users[i].username),
                ListView.builder(
                  itemCount: _users[i].data.length,
                  itemBuilder: (BuildContext ctx, int j) {
                    return Text(_users[i]
                        .data[j]
                        .username); // display username as an example
                  },
                ),
              ],
            ),
          );
        },
      ),
    );

Follows a full example:

class _HomeScreenState extends State<HomeScreen> {
  List<User> _users = [];
  @override
  void initState() {
    super.initState();
    _load();
  }

  void _load() async {
    List<User> users =
        await RestApi.getUsers(); // load the users on Widget init
    setState(() => _users = users);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: new ListView.builder(
        itemCount: _users.length,
        itemBuilder: (BuildContext ctxt, int i) {
          return new Card(
            child: Column(
              children: [
                Text(_users[i].username),
                ListView.builder(
                  itemCount: _users[i].data.length,
                  itemBuilder: (BuildContext ctx, int j) {
                    return Text(_users[i]
                        .data[j]
                        .username); // display username as an example
                  },
                ),
              ],
            ),
          );
        },
      ),
    );
  }
}

As your app gets more complicated, I'd suggest checking out different State Management strategies, such as BLoC.

thanks for your answer. its work. now im gonna using bloc form your advice
Happy to help, don’t forget to select the answer as correct!

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