Native UI integration layer

Generated bindings create native views like any other object; this layer shows them inside the framework's view tree. It is the only part of the project that uses the Flutter plugin API / React Native view managers. Everything else stays plugin-free.

Flutter — runtimes/flutter/native_api_ui#

dependencies:
  native_api_ui: ^0.1.0-beta.1   # pub.dev

// Android: any binding of an android.view.View subclass.
final label = TextView(appContext)..setText$CharSequence('Hi'.toJString());
NativeView.android(view: label);

// iOS: any binding of a UIView subclass.
final view = ios.UILabel.new$()..text = 'Hi'.toNSString();
NativeView.ios(view: view);

• Android: AndroidView (texture-layer hybrid composition). The View is registered in NabViewRegistry over JNI and picked up by the platform view factory dev.nativeapibindgen/view; the registry entry is removed when the widget is disposed. Consumer ProGuard rules keep the registry.
• iOS: UiKitView; the widget keeps the UIView alive while it is shown and passes its address to the factory, which borrows it.
• Create views on the platform thread (the root isolate on Android and iOS).

React Native — NativeView (exported by the generated library)#

import { NativeView, TextView, applicationContext } from './native-api-bindings';
const tv = TextView.new(applicationContext());
tv.setText$CharSequence('Hi');
<NativeView view={tv} style={{ width: 200, height: 48 }} />

• Runtime builtins registerView / unregisterView keep the view while the component is mounted; the view manager NabNativeView (Android NabNativeViewManager, iOS NabNativeViewManager) adds it to its container. React Native's interop layer serves these view managers to the New Architecture (Fabric).
• Android: add NabUiPackage() to the app's packages (see the example's MainApplication.kt). iOS: compiled from the generated pod.

Tested (2026-10-05)#

Not covered: gestures/accessibility forwarding beyond what platform views provide, multiple simultaneous hosts of one view, and UI classes that are not View/UIView subclasses (not embeddable).