Tips Jitu Optimasi Aplikasi Flutter untuk HP Low-End, Performa Naik 300%!

// BURUK ❌
Widget build(BuildContext context) {
return Container(
  padding: EdgeInsets.all(16.0),
  child: Text('Hello'),
);
}

// BAIK ✅
Widget build(BuildContext context) {
return const Container(
  padding: EdgeInsets.all(16.0),
  child: Text('Hello'),
);
}

class _MyWidgetState extends State {
AnimationController _controller;
StreamSubscription _subscription;

@override
void dispose() {
  _controller.dispose();
  _subscription.cancel();
  super.dispose();
}

// BURUK ❌
ListView(
children: items.map((item) => ItemWidget(item)).toList(),
)

// BAIK ✅
ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) => ItemWidget(items[index]),
)

class CustomButton extends StatelessWidget {
final String text;

const CustomButton({Key? key, required this.text}) : super(key: key);

@override
Widget build(BuildContext context) {
  return Container(
    padding: const EdgeInsets.all(8.0),
    child: Text(text),
  );
}
}

// Gunakan cached_network_image
CachedNetworkImage(
imageUrl: "https://example.com/image.jpg",
placeholder: (context, url) => CircularProgressIndicator(),
errorWidget: (context, url, error) => Icon(Icons.error),
)

class UserProvider with ChangeNotifier {
User? _user;

User? get user => _user;

void updateUser(User newUser) {
  _user = newUser;
  notifyListeners();
}
}

class CartProvider with ChangeNotifier {
List _items = [];

double get totalPrice => _items.fold(
  0, 
  (sum, item) => sum + item.price
);
}

// Gunakan shared_preferences untuk caching sederhana
class CacheManager {
static Future saveData(String key, String value) async {
  final prefs = await SharedPreferences.getInstance();
  await prefs.setString(key, value);
}

static Future getData(String key) async {
  final prefs = await SharedPreferences.getInstance();
  return prefs.getString(key);
}
}

// Implementasi pagination
Future> fetchItems({int page = 1, int limit = 20}) async {
final response = await http.get(
  Uri.parse('https://api.example.com/items?page=$page&limit=$limit')
);

if (response.statusCode == 200) {
  return Item.fromJsonList(jsonDecode(response.body));
}
throw Exception('Failed to load items');
}