go-music-player/gmus-mobile/lib/components/artists.dart

import 'dart:convert';

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

import '../config.dart';

class Artists extends StatefulWidget {
  @override
  _ArtistsWidgetState createState() => _ArtistsWidgetState();
}

Future<List<String>> fetchArtists() async {
  final response = await http.get(Uri.https(config['apiUrl'], '/artists'));

  if (response.statusCode == 200) {
    return List<String>.from(jsonDecode(response.body)['artists']);
  } else {
    throw Exception('Failed to load artists');
  }
}

class _ArtistsWidgetState extends State<Artists> {
  Future<List<String>> artists;

  @override
  void initState() {
    super.initState();
    artists = fetchArtists();
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<String>>(
      future: artists,
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return ListView(
            padding: EdgeInsets.only(left: 8, right: 8),
            children: snapshot.data.map((artist) => Container(
              height: 32,
              color: Colors.white,
              child: Align(
                alignment: Alignment.centerLeft,
                child: Text(artist.length == 0 ? 'Unknown artist' : artist),
              ),
            )).toList(),
          );
        }
        if (snapshot.hasError) {
          return Text("${snapshot.error}");
        }

        return CircularProgressIndicator();
      },
    );
  }
}