improve lifecycle management

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/GeckoPlatformView.kt

@@ -18,13 +18,15 @@ import io.flutter.plugin.platform.PlatformView
 import io.flutter.plugin.platform.PlatformViewFactory
 
 class GeckoViewFactory(
-    private val activity: Activity,
+    private val activityProvider: () -> Activity?,
     private val containerId: Int,
     private val flutterEvents: GeckoStateEvents
     ) : PlatformViewFactory(
     StandardMessageCodec.INSTANCE) {
     override fun create(context: Context?, id: Int, args: Any?): PlatformView {
-        return NativeFragmentView(this.activity, this.containerId, this.flutterEvents)
+        val activity = activityProvider()
+            ?: throw IllegalStateException("No activity available when creating GeckoView platform view")
+        return NativeFragmentView(activity, this.containerId, this.flutterEvents)
     }
 }
 

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/api/GeckoBrowserApiImpl.kt

@@ -134,26 +134,27 @@ class GeckoBrowserApiImpl : GeckoBrowserApi {
         _flutterPluginBinding = flutterPluginBinding
         _flutterEvents = GeckoStateEvents(_flutterPluginBinding.binaryMessenger)
 
+        // Register platform view factory once per engine binding.
+        // The factory resolves the current activity lazily via activityProvider,
+        // so it always uses the latest activity after recreation/config changes.
+        _flutterPluginBinding.platformViewRegistry.registerViewFactory(
+            "eu.weblibre/gecko", GeckoViewFactory(
+                activityProvider = { this.activity },
+                FRAGMENT_CONTAINER_ID,
+                _flutterEvents
+            )
+        )
+        isPlatformViewRegistered = true
+
         isGeckoInitialized = false
     }
 
     fun attachActivity(activity: Activity) {
         this.activity = activity
-
-        _flutterPluginBinding.platformViewRegistry.registerViewFactory(
-            "eu.weblibre/gecko", GeckoViewFactory(
-                activity,
-                FRAGMENT_CONTAINER_ID,
-                _flutterEvents
-            )
-        )
-
-        isPlatformViewRegistered = true
     }
 
     fun detachActivity() {
         this.activity = null
-        isPlatformViewRegistered = false
     }
 
     override fun getGeckoVersion(): String {