Piye carane nangani networking lan APIs ing Flutter?

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Aplikasi Flutter asring komunikasi karo **APIs** — nggawe HTTP requests, parsing JSON, lan nangani responses/errors. Nggunakake **http** utawa **dio** packages, **async/await**, lan JSON parsing, networking minangka bagean inti saking banyak aplikasi. ## Nggawe HTTP requests ```dart import 'package:http/http.dart' as http; // GET request Future> fetchUsers() async { final response = await http.get(Uri.parse('https://api.example.com/users')); if (response.statusCode == 200) { final List data = jsonDecode(response.body); // parse JSON return data.map((json) => User.fromJson(json)).toList(); } else { throw Exception('Failed to load users'); // handle errors } } // POST request await http.post( Uri.parse('https://api.example.com/users'), headers: {'Content-Type': 'application/json'}, body: jsonEncode({'name': 'Ann'}), ); ``` ## JSON parsing (serialization) ```dart // model class with fromJson/toJson (convert between JSON and Dart objects) class User { final String name; User(this.name); factory User.fromJson(Map json) => User(json['name']); Map toJson() => {'name': name}; } // → for many models, use code generation (json_serializable) to avoid boilerplate ``` ## Best practices ```text ✓ Use a SERVICE/repository layer (separate networking from UI) — clean architecture ✓ Handle ERRORS (network failures, non-200 status, timeouts) gracefully → show UI feedback ✓ Show LOADING states (FutureBuilder / state management) ✓ Use DIO for advanced needs (interceptors, retries, better config) vs basic http ✓ Parse JSON into typed MODELS (not raw maps) — type safety ✓ Handle auth (tokens in headers), timeouts, and cancellation ``` ## Penapa artinya Paham networking lan APIs ing Flutter iku penting banget amerga **banyak aplikasi komunikasi karo backends** — fetch lan kirim data liwat HTTP iku bagean inti saking meh kabeh aplikasi nyata, dadi iku kudu tahu ilmu praktis. Aplicasi terus-terusan kudu nggawe API calls (loading data, submit forms, authentication), lan paham carane nggawe iki kanthi bener iku fundamental. Tahuning carane **nggawe HTTP requests** (GET, POST, etc. nggunakake `http` utawa `dio` packages karo async/await), **parse JSON** (ubah API responses dadi typed Dart model objects liwat `fromJson`/`toJson`, ideale karo code generation kanggo banyak models), lan **nangani responses lan errors** (cek status codes, throw/handle exceptions) iku skill praktis inti. Paham **best practices** iku khususne berharga: nggunakake **service/repository layer** kanggo pisahake networking saking UI (clean architecture, maintainability), **nangani errors kanthi bagus** (network failures, non-200 statuses, timeouts — tampilke UI feedback sing cocok, amarga network calls asring gagal), **tampilke loading states** (liwat FutureBuilder utawa state management, kanggo UX sing apik), parse JSON dadi **typed models** (kanggo type safety tinimbang raw maps), lan nangani auth lan timeouts — iki nggambarke bangun robust, maintainable networking code tinimbang fragile ad-hoc calls. Amarga banyak Flutter apps komunikasi karo APIs (kebutuhan hampir universal) lan nggawekake kanthi bener (proper requests, JSON parsing dadi models, error handling, loading states, lan clean architecture) iku penting kanggo functional, robust apps, lan amarga paham tools lan best practices iku perlu kanggo core capability iki, paham networking lan APIs ing Flutter iku penting, frequently-applied praktis ilmu — fundamental skill sing kudu dinggo hampir kabeh aplikasi Flutter nyata sing komunikasi karo backend, sentral kanggo bangun apps sing fetch lan tampilke data nyata kanthi reliable.