mobile-app

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---
name: mobile-app
classification: capability
classification-reason: Specialized domain knowledge with limited model overlap
deprecation-risk: low
effort: low
description: |
  Mobile app development guide — React Native, Flutter, Expo for cross-platform.
  Triggers: mobile app, React Native, Flutter, Expo, iOS, Android
agent: bkit:pipeline-guide
allowed-tools:
  - Read
  - Write
  - Edit
  - Glob
  - Grep
  - Bash
  - WebSearch
user-invocable: true
---

# Mobile App Development Expertise

## Overview

A guide for developing mobile apps based on web development experience.
Develop for iOS and Android simultaneously using cross-platform frameworks.

---

## Framework Selection Guide

### Framework Selection by Tier (v1.3.0)

| Framework | Tier | Recommendation | Use Case |
|-----------|------|----------------|----------|
| **React Native (Expo)** | Tier 1 | ⭐ Primary | TypeScript ecosystem, AI tools |
| **React Native CLI** | Tier 1 | Recommended | Native module needs |
| **Flutter** | Tier 2 | Supported | Multi-platform (6 OS), performance |

> **AI-Native Recommendation**: React Native with TypeScript
> - Full Copilot/Claude support
> - Extensive npm ecosystem
> - 20:1 developer availability vs Dart

> **Performance Recommendation**: Flutter
> - Impeller rendering engine
> - Single codebase for 6 platforms
> - Smaller bundles

### Level-wise Recommendations

```
Starter → Expo (React Native) [Tier 1]
  - Simple setup, can leverage web knowledge
  - Full AI tool support

Dynamic → Expo + EAS Build [Tier 1] or Flutter [Tier 2]
  - Includes server integration, production build support
  - Choose Flutter for multi-platform needs

Enterprise → React Native CLI [Tier 1] or Flutter [Tier 2]
  - Complex native features, performance optimization needed
  - Flutter for consistent cross-platform UI
```

---

## Expo (React Native) Guide

### Project Creation

```bash
# Install Expo CLI
npm install -g expo-cli

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

# Start development server
npx expo start
```

### Folder Structure

```
my-app/
├── app/                    # Expo Router pages
│   ├── (tabs)/            # Tab navigation
│   │   ├── index.tsx      # Home tab
│   │   ├── explore.tsx    # Explore tab
│   │   └── _layout.tsx    # Tab layout
│   ├── _layout.tsx        # Root layout
│   └── +not-found.tsx     # 404 page
├── components/            # Reusable components
├── hooks/                 # Custom hooks
├── constants/             # Constants
├── assets/               # Images, fonts, etc.
├── app.json              # Expo configuration
└── package.json
```

### Navigation Patterns

```typescript
// app/_layout.tsx - Stack navigation
import { Stack } from 'expo-router';

export default function RootLayout() {
  return (
    <Stack>
      <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
      <Stack.Screen name="modal" options={{ presentation: 'modal' }} />
    </Stack>
  );
}
```

```typescript
// app/(tabs)/_layout.tsx - Tab navigation
import { Tabs } from 'expo-router';
import { Ionicons } from '@expo/vector-icons';

export default function TabLayout() {
  return (
    <Tabs>
      <Tabs.Screen
        name="index"
        options={{
          title: 'Home',
          tabBarIcon: ({ color }) => <Ionicons name="home" color={color} size={24} />,
        }}
      />
      <Tabs.Screen
        name="profile"
        options={{
          title: 'Profile',
          tabBarIcon: ({ color }) => <Ionicons name="person" color={color} size={24} />,
        }}
      />
    </Tabs>
  );
}
```

### Styling Patterns

```typescript
// Basic StyleSheet
import { StyleSheet, View, Text } from 'react-native';

export function MyComponent() {
  return (
    <View style={styles.container}>
      <Text style={styles.title}>Hello</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    padding: 16,
    backgroundColor: '#fff',
  },
  title: {
    fontSize: 24,
    fontWeight: 'bold',
  },
}