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Zhongwei Li
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{
"name": "mobile-development",
"description": "Mobile development patterns for React Native and Flutter with offline-first architecture",
"version": "1.0.0",
"author": {
"name": "Brock"
},
"agents": [
"./agents"
],
"commands": [
"./commands"
]
}

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README.md Normal file
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# mobile-development
Mobile development patterns for React Native and Flutter with offline-first architecture

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# Mobile App Builder Agent
You are an autonomous agent specialized in building mobile applications with React Native and Flutter using offline-first architecture and modern best practices.
## Your Mission
Build production-ready mobile applications that work seamlessly offline, provide excellent UX, and follow platform-specific guidelines.
## Core Responsibilities
### 1. Set Up Mobile Project
- Initialize React Native or Flutter project
- Configure navigation
- Set up state management (Zustand/Riverpod)
- Configure offline storage
- Set up build tooling
### 2. Implement Offline-First Architecture
- Local database with Drift/SQLite/AsyncStorage
- Data synchronization strategy
- Conflict resolution
- Queue failed requests
- Background sync
### 3. Build UI Components
- Platform-specific components
- Responsive layouts
- Dark mode support
- Accessibility
- Animations
### 4. Implement State Management
React Native:
```typescript
import { create } from 'zustand';
import { persist } from 'zustand/middleware';
const useStore = create(persist(
(set) => ({
user: null,
login: (user) => set({ user }),
}),
{ name: 'app-storage' }
));
```
Flutter:
```dart
final userProvider = StateNotifierProvider<UserNotifier, User?>((ref) {
return UserNotifier();
});
```
### 5. Handle Navigation
- Stack navigation
- Tab navigation
- Deep linking
- Authentication flows
### 6. Optimize Performance
- List virtualization
- Image caching
- Memoization
- Code splitting
### 7. Testing
- Unit tests
- Widget/component tests
- Integration tests
- E2E tests
## Deliverables
1. Fully functional mobile app
2. Offline-first data layer
3. Responsive UI
4. Navigation setup
5. Testing suite
6. Build configuration
7. Deployment guide

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# Mobile Development Patterns
Comprehensive mobile development patterns for React Native and Flutter with offline-first architecture and best practices.
## React Native Patterns
### Project Structure
```
src/
├── components/ # Reusable UI components
├── screens/ # Screen components
├── navigation/ # Navigation configuration
├── services/ # API and business logic
├── state/ # State management
├── hooks/ # Custom hooks
├── utils/ # Utility functions
└── types/ # TypeScript types
```
### Navigation with React Navigation
```typescript
// navigation/AppNavigator.tsx
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
type RootStackParamList = {
Home: undefined;
Profile: { userId: string };
Settings: undefined;
};
const Stack = createNativeStackNavigator<RootStackParamList>();
const Tab = createBottomTabNavigator();
function TabNavigator() {
return (
<Tab.Navigator>
<Tab.Screen name="Home" component={HomeScreen} />
<Tab.Screen name="Profile" component={ProfileScreen} />
<Tab.Screen name="Settings" component={SettingsScreen} />
</Tab.Navigator>
);
}
export function AppNavigator() {
return (
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Main" component={TabNavigator} />
<Stack.Screen name="Details" component={DetailsScreen} />
</Stack.Navigator>
</NavigationContainer>
);
}
```
### State Management with Zustand
```typescript
import { create } from 'zustand';
import { persist, createJSONStorage } from 'zustand/middleware';
import AsyncStorage from '@react-native-async-storage/async-storage';
interface User {
id: string;
name: string;
email: string;
}
interface UserStore {
user: User | null;
isLoading: boolean;
error: string | null;
login: (email: string, password: string) => Promise<void>;
logout: () => void;
updateProfile: (data: Partial<User>) => Promise<void>;
}
export const useUserStore = create<UserStore>()(
persist(
(set, get) => ({
user: null,
isLoading: false,
error: null,
login: async (email, password) => {
set({ isLoading: true, error: null });
try {
const user = await authService.login(email, password);
set({ user, isLoading: false });
} catch (error) {
set({ error: error.message, isLoading: false });
}
},
logout: () => {
set({ user: null });
},
updateProfile: async (data) => {
const currentUser = get().user;
if (!currentUser) return;
set({ isLoading: true });
try {
const updated = await userService.update(currentUser.id, data);
set({ user: updated, isLoading: false });
} catch (error) {
set({ error: error.message, isLoading: false });
}
},
}),
{
name: 'user-storage',
storage: createJSONStorage(() => AsyncStorage),
}
)
);
```
### Offline-First with React Query
```typescript
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { persistQueryClient } from '@tanstack/react-query-persist-client';
import { createAsyncStoragePersister } from '@tanstack/query-async-storage-persister';
import AsyncStorage from '@react-native-async-storage/async-storage';
import NetInfo from '@react-native-community/netinfo';
// Setup persistence
const asyncStoragePersister = createAsyncStoragePersister({
storage: AsyncStorage,
});
persistQueryClient({
queryClient,
persister: asyncStoragePersister,
});
// Custom hook for online status
export function useOnlineStatus() {
const [isOnline, setIsOnline] = useState(true);
useEffect(() => {
return NetInfo.addEventListener(state => {
setIsOnline(state.isConnected ?? false);
});
}, []);
return isOnline;
}
// Offline-capable query
export function usePosts() {
const isOnline = useOnlineStatus();
return useQuery({
queryKey: ['posts'],
queryFn: fetchPosts,
staleTime: 5 * 60 * 1000, // 5 minutes
cacheTime: 24 * 60 * 60 * 1000, // 24 hours
enabled: isOnline,
refetchOnMount: isOnline,
});
}
// Offline-capable mutation with queue
export function useCreatePost() {
const queryClient = useQueryClient();
const isOnline = useOnlineStatus();
return useMutation({
mutationFn: createPost,
onMutate: async (newPost) => {
// Cancel outgoing refetches
await queryClient.cancelQueries({ queryKey: ['posts'] });
// Snapshot previous value
const previousPosts = queryClient.getQueryData(['posts']);
// Optimistically update
queryClient.setQueryData(['posts'], (old: any) => [...old, newPost]);
return { previousPosts };
},
onError: (err, newPost, context) => {
// Rollback on error
queryClient.setQueryData(['posts'], context?.previousPosts);
if (!isOnline) {
// Queue for later
queueMutation('createPost', newPost);
}
},
onSuccess: () => {
queryClient.invalidateQueries({ queryKey: ['posts'] });
},
});
}
```
## Flutter Patterns
### Project Structure
```
lib/
├── main.dart
├── app/
│ ├── routes.dart
│ └── theme.dart
├── features/
│ ├── auth/
│ │ ├── models/
│ │ ├── providers/
│ │ ├── screens/
│ │ └── widgets/
│ └── home/
├── core/
│ ├── services/
│ ├── utils/
│ └── constants/
└── shared/
└── widgets/
```
### Navigation with GoRouter
```dart
import 'package:go_router/go_router.dart';
final router = GoRouter(
routes: [
GoRoute(
path: '/',
builder: (context, state) => const HomeScreen(),
routes: [
GoRoute(
path: 'profile/:id',
builder: (context, state) {
final id = state.pathParameters['id']!;
return ProfileScreen(userId: id);
},
),
],
),
GoRoute(
path: '/settings',
builder: (context, state) => const SettingsScreen(),
),
],
redirect: (context, state) {
final isLoggedIn = authService.isAuthenticated;
final isAuthRoute = state.matchedLocation.startsWith('/auth');
if (!isLoggedIn && !isAuthRoute) {
return '/auth/login';
}
if (isLoggedIn && isAuthRoute) {
return '/';
}
return null;
},
);
// Usage
void main() {
runApp(MaterialApp.router(
routerConfig: router,
));
}
```
### State Management with Riverpod
```dart
import 'package:flutter_riverpod/flutter_riverpod.dart';
// Model
class User {
final String id;
final String name;
final String email;
User({required this.id, required this.name, required this.email});
}
// Repository
class UserRepository {
Future<User> getUser(String id) async {
// API call
}
Future<User> updateUser(String id, Map<String, dynamic> data) async {
// API call
}
}
// Providers
final userRepositoryProvider = Provider((ref) => UserRepository());
final userProvider = FutureProvider.family<User, String>((ref, id) async {
final repository = ref.watch(userRepositoryProvider);
return repository.getUser(id);
});
// Notifier for mutable state
class UserNotifier extends StateNotifier<AsyncValue<User>> {
UserNotifier(this.repository) : super(const AsyncValue.loading());
final UserRepository repository;
Future<void> loadUser(String id) async {
state = const AsyncValue.loading();
state = await AsyncValue.guard(() => repository.getUser(id));
}
Future<void> updateUser(String id, Map<String, dynamic> data) async {
state = await AsyncValue.guard(() => repository.updateUser(id, data));
}
}
final userNotifierProvider = StateNotifierProvider<UserNotifier, AsyncValue<User>>((ref) {
return UserNotifier(ref.watch(userRepositoryProvider));
});
// Usage in widget
class ProfileScreen extends ConsumerWidget {
final String userId;
const ProfileScreen({required this.userId});
@override
Widget build(BuildContext context, WidgetRef ref) {
final userAsync = ref.watch(userProvider(userId));
return userAsync.when(
data: (user) => Text(user.name),
loading: () => CircularProgressIndicator(),
error: (error, stack) => Text('Error: $error'),
);
}
}
```
### Offline-First with Drift (SQLite)
```dart
import 'package:drift/drift.dart';
import 'package:drift/native.dart';
// Define tables
class Users extends Table {
IntColumn get id => integer().autoIncrement()();
TextColumn get name => text().withLength(min: 1, max: 100)();
TextColumn get email => text()();
DateTimeColumn get createdAt => dateTime().withDefault(currentDateAndTime)();
}
class Posts extends Table {
IntColumn get id => integer().autoIncrement()();
IntColumn get userId => integer().references(Users, #id)();
TextColumn get title => text()();
TextColumn get content => text()();
DateTimeColumn get createdAt => dateTime().withDefault(currentDateAndTime)();
}
// Database
@DriftDatabase(tables: [Users, Posts])
class AppDatabase extends _$AppDatabase {
AppDatabase() : super(_openConnection());
@override
int get schemaVersion => 1;
static LazyDatabase _openConnection() {
return LazyDatabase(() async {
final dbFolder = await getApplicationDocumentsDirectory();
final file = File(path.join(dbFolder.path, 'app.db'));
return NativeDatabase(file);
});
}
// Queries
Future<List<User>> getAllUsers() => select(users).get();
Stream<List<User>> watchAllUsers() => select(users).watch();
Future<User> getUserById(int id) =>
(select(users)..where((u) => u.id.equals(id))).getSingle();
Future<int> createUser(UsersCompanion user) => into(users).insert(user);
Future<bool> updateUser(User user) => update(users).replace(user);
Future<int> deleteUser(int id) =>
(delete(users)..where((u) => u.id.equals(id))).go();
}
// Service with sync
class UserService {
final AppDatabase db;
final ApiClient api;
UserService(this.db, this.api);
Future<void> syncUsers() async {
try {
final remoteUsers = await api.fetchUsers();
await db.transaction(() async {
for (final user in remoteUsers) {
await db.into(db.users).insertOnConflictUpdate(
UsersCompanion(
id: Value(user.id),
name: Value(user.name),
email: Value(user.email),
),
);
}
});
} catch (e) {
print('Sync failed: $e');
}
}
Stream<List<User>> watchUsers() {
// Start sync in background
syncUsers();
// Return live data from local DB
return db.watchAllUsers();
}
}
```
## Performance Optimization
### React Native
```typescript
// Use React.memo for component optimization
export const UserCard = React.memo(({ user }: { user: User }) => {
return (
<View>
<Text>{user.name}</Text>
</View>
);
});
// Use useMemo for expensive calculations
const sortedUsers = useMemo(() => {
return users.sort((a, b) => a.name.localeCompare(b.name));
}, [users]);
// Use useCallback for function memoization
const handlePress = useCallback(() => {
navigation.navigate('Details', { id: user.id });
}, [user.id]);
// FlatList optimization
<FlatList
data={items}
renderItem={({ item }) => <ItemCard item={item} />}
keyExtractor={item => item.id}
removeClippedSubviews={true}
maxToRenderPerBatch={10}
windowSize={21}
getItemLayout={(data, index) => ({
length: ITEM_HEIGHT,
offset: ITEM_HEIGHT * index,
index,
})}
/>
```
### Flutter
```dart
// Use const constructors
const Text('Hello');
// ListView optimization
ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) {
return ItemCard(item: items[index]);
},
cacheExtent: 100,
);
// Image caching
CachedNetworkImage(
imageUrl: user.avatarUrl,
placeholder: (context, url) => CircularProgressIndicator(),
errorWidget: (context, url, error) => Icon(Icons.error),
);
```
## Testing
### React Native Testing Library
```typescript
import { render, fireEvent, waitFor } from '@testing-library/react-native';
describe('LoginScreen', () => {
it('should submit form with valid credentials', async () => {
const mockLogin = jest.fn();
const { getByPlaceholderText, getByText } = render(
<LoginScreen onLogin={mockLogin} />
);
fireEvent.changeText(getByPlaceholderText('Email'), 'test@example.com');
fireEvent.changeText(getByPlaceholderText('Password'), 'password123');
fireEvent.press(getByText('Login'));
await waitFor(() => {
expect(mockLogin).toHaveBeenCalledWith('test@example.com', 'password123');
});
});
});
```
### Flutter Widget Tests
```dart
testWidgets('Counter increments', (WidgetTester tester) async {
await tester.pumpWidget(MyApp());
expect(find.text('0'), findsOneWidget);
expect(find.text('1'), findsNothing);
await tester.tap(find.byIcon(Icons.add));
await tester.pump();
expect(find.text('0'), findsNothing);
expect(find.text('1'), findsOneWidget);
});
```
## Best Practices
1. **Use TypeScript/Dart for type safety**
2. **Implement offline-first architecture**
3. **Optimize list rendering**
4. **Use memo/const for performance**
5. **Handle loading and error states**
6. **Implement proper navigation**
7. **Test on real devices**
8. **Monitor app performance**
9. **Handle permissions properly**
10. **Follow platform guidelines**

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