Native Platform Interoperability

Developing Flutter apps often requires direct communication with the underlying native platform (Android/iOS). This skill covers the standards for maintainable and type-safe interoperability.

1. MethodChannels (One-shot)

Use MethodChannel for standard request-response patterns between Dart and Native.

Dart Standard

• Use a unique domain-style channel name.
• ALWAYS wrap calls in a try-catch for PlatformException.

static const _channel = MethodChannel('com.example.app/device_info');

Future<String?> getDeviceOS() async {
  try {
    return await _channel.invokeMethod<String>('getOS');
  } on PlatformException catch (e) {
    AppLogger.error('Failed to get OS', error: e);
    return null;
  }
}

2. EventChannels (Streams)

Use EventChannel for continuous data flow (e.g., sensor data, connectivity).

Implementation

• Native side MUST handle onListen and onCancel.
• Dart side MUST dispose the subscription to prevent leaks.

3. Type Safety with Pigeon

For complex APIs, avoid manual string-based keys. Use Pigeon to generate type-safe interfaces.

4. Platform-Specific Directory Structure

Organize native code within the relevant feature if possible, or use a dedicated plugins/ directory for shared logic.

5. Federated Plugins

If the logic is reusable across multiple apps:

• Split implementation into _platform_interface, _android, _ios, and _web packages.
• Provide a single entry point for users.