Mobile App

Mobile App Skill

Build cross-platform mobile applications

Frameworks

React Native + Expo (Recommended)

# Create new Expo project
npx create-expo-app my-app
cd my-app
npx expo start

Pros:

• JavaScript/TypeScript
• Hot reloading
• Expo SDK for native features
• Web support

Flutter

# Create new Flutter project
flutter create my_app
cd my_app
flutter run

Pros:

• Dart language
• Custom UI rendering
• Excellent performance
• Material & Cupertino widgets

Project Structure (Expo)

my-app/
├── app/
│   ├── (tabs)/
│   │   ├── index.tsx
│   │   └── settings.tsx
│   ├── _layout.tsx
│   └── +not-found.tsx
├── components/
├── hooks/
├── constants/
└── assets/

Key Considerations

Navigation

// Using Expo Router
import { Link } from 'expo-router';

export default function Home() {
  return (
    <Link href="/settings">
      Go to Settings
    </Link>
  );
}

Native Features

// Camera access
import { Camera } from 'expo-camera';

// Location
import * as Location from 'expo-location';

// Notifications
import * as Notifications from 'expo-notifications';

State Management

• Zustand (simple)
• Redux Toolkit (complex)
• React Query (server state)

Deployment

• iOS: App Store Connect
• Android: Google Play Console
• Both: Expo EAS Build

# Build for both platforms
eas build --platform all