mobile-offline-support
Implement offline-first mobile apps with local storage, sync strategies, and conflict resolution. Covers AsyncStorage, Realm, SQLite, and background sync patterns.
What this skill does
# Mobile Offline Support
## Table of Contents
- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)
## Overview
Design offline-first mobile applications that provide seamless user experience regardless of connectivity.
## When to Use
- Building apps that work without internet connection
- Implementing seamless sync when connectivity returns
- Handling data conflicts between device and server
- Reducing server load with intelligent caching
- Improving app responsiveness with local storage
## Quick Start
Minimal working example:
```javascript
import AsyncStorage from '@react-native-async-storage/async-storage';
import NetInfo from '@react-native-community/netinfo';
class StorageManager {
static async saveItems(items) {
try {
await AsyncStorage.setItem(
'items_cache',
JSON.stringify({ data: items, timestamp: Date.now() })
);
} catch (error) {
console.error('Failed to save items:', error);
}
}
static async getItems() {
try {
const data = await AsyncStorage.getItem('items_cache');
return data ? JSON.parse(data) : null;
} catch (error) {
console.error('Failed to retrieve items:', error);
return null;
}
}
// ... (see reference guides for full implementation)
```
## Reference Guides
Detailed implementations in the `references/` directory:
| Guide | Contents |
|---|---|
| [React Native Offline Storage](references/react-native-offline-storage.md) | React Native Offline Storage |
| [iOS Core Data Implementation](references/ios-core-data-implementation.md) | iOS Core Data Implementation |
| [Android Room Database](references/android-room-database.md) | Android Room Database |
## Best Practices
### ✅ DO
- Implement robust local storage
- Use automatic sync when online
- Provide visual feedback for offline status
- Queue actions for later sync
- Handle conflicts gracefully
- Cache frequently accessed data
- Implement proper error recovery
- Test offline scenarios thoroughly
- Use compression for large data
- Monitor storage usage
### ❌ DON'T
- Assume constant connectivity
- Sync large files frequently
- Ignore storage limitations
- Force unnecessary syncing
- Lose data on offline mode
- Store sensitive data unencrypted
- Accumulate infinite queue items
- Ignore sync failures silently
- Sync in tight loops
- Deploy without offline testing
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