TurboModuleExample

React Native project demonstrating Android Turbo Modules (New Architecture).

Native Modules

NativeLocalStorage

Key-value storage module. Internally uses Android SharedPreferences.

Method	Description
setItem(value, key)	Save a value
getItem(key)	Retrieve a value
removeItem(key)	Delete a value
clear()	Clear all data

NativeDocumentScanner

Document scanner using Google ML Kit SDK.

Method	Description
scanDocument(pageLimit)	Opens camera scanner, returns image URI

How it works:

I built a native module that integrates Google ML Kit Document Scanner SDK into React Native. ML Kit handles scanning, edge detection, and image processing. My module bridges it to JS — configures options, launches scanner, and returns the scanned image URI via Promise

1. JS calls scanDocument(pageLimit) → Promise created
2. Native module configures ML Kit options (page limit, formats, scanner mode)
3. ML Kit opens built-in camera UI — no custom camera code needed
4. ML Kit detects document edges, auto crops, removes shadows, fixes rotation
5. User confirms scan → onActivityResult receives scanned image
6. Native module resolves Promise with image URI back to JS
7. JS displays scanned image using the returned URI

Project Structure

specs/                              # TypeScript specs (codegen input)
├── NativeLocalStorage.ts
└── NativeDocumentScanner.ts

android/.../com/
├── nativelocalstorage/
│   ├── NativeLocalStorageModule.kt
│   └── NativeLocalStoragePackage.kt
├── nativedocumentscanner/
│   ├── NativeDocumentScannerModule.kt
│   └── NativeDocumentScannerPackage.kt
└── turbomoduleexample/
    ├── MainActivity.kt
    └── MainApplication.kt

Run

npm install
npm run android