Support onWindowFocusChange in Bridgeless (#43398)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43398

Implement onWindowFocusChange in Bridgeless by adding it to the ReactHostImpl

Changelog:
[Android][Breaking] Implement onWindowFocusChange in Bridgeless

Reviewed By: javache

Differential Revision: D54670119

fbshipit-source-id: 71f560e5a3bf0e853ac06955e67b8035f1ec0468

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -153,6 +153,7 @@ public class com/facebook/react/ReactDelegate {
 	public fun onHostDestroy ()V
 	public fun onHostPause ()V
 	public fun onHostResume ()V
+	public fun onWindowFocusChanged (Z)V
 	public fun shouldShowDevMenuOrReload (ILandroid/view/KeyEvent;)Z
 }
 
@@ -203,6 +204,7 @@ public abstract interface class com/facebook/react/ReactHost {
 	public abstract fun onHostPause (Landroid/app/Activity;)V
 	public abstract fun onHostResume (Landroid/app/Activity;)V
 	public abstract fun onHostResume (Landroid/app/Activity;Lcom/facebook/react/modules/core/DefaultHardwareBackBtnHandler;)V
+	public abstract fun onWindowFocusChange (Z)V
 	public abstract fun reload (Ljava/lang/String;)Lcom/facebook/react/interfaces/TaskInterface;
 	public abstract fun removeBeforeDestroyListener (Lkotlin/jvm/functions/Function0;)V
 	public abstract fun setJsEngineResolutionAlgorithm (Lcom/facebook/react/JSEngineResolutionAlgorithm;)V
@@ -3641,6 +3643,7 @@ public class com/facebook/react/runtime/ReactHostImpl : com/facebook/react/React
 	public fun onHostPause (Landroid/app/Activity;)V
 	public fun onHostResume (Landroid/app/Activity;)V
 	public fun onHostResume (Landroid/app/Activity;Lcom/facebook/react/modules/core/DefaultHardwareBackBtnHandler;)V
+	public fun onWindowFocusChange (Z)V
 	public fun reload (Ljava/lang/String;)Lcom/facebook/react/interfaces/TaskInterface;
 	public fun removeBeforeDestroyListener (Lkotlin/jvm/functions/Function0;)V
 	public fun removeReactInstanceEventListener (Lcom/facebook/react/ReactInstanceEventListener;)V

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactActivityDelegate.java

@@ -195,13 +195,7 @@ public class ReactActivityDelegate {
   }
 
   public void onWindowFocusChanged(boolean hasFocus) {
-    if (ReactFeatureFlags.enableBridgelessArchitecture) {
-      // TODO T156475655: support onWindowFocusChanged
-    } else {
-      if (getReactNativeHost().hasInstance()) {
-        getReactNativeHost().getReactInstanceManager().onWindowFocusChange(hasFocus);
-      }
-    }
+    mReactDelegate.onWindowFocusChanged(hasFocus);
   }
 
   public void onConfigurationChanged(Configuration newConfig) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactDelegate.java

@@ -148,6 +148,16 @@ public class ReactDelegate {
     }
   }
 
+  public void onWindowFocusChanged(boolean hasFocus) {
+    if (ReactFeatureFlags.enableBridgelessArchitecture) {
+      mReactHost.onWindowFocusChange(hasFocus);
+    } else {
+      if (getReactNativeHost().hasInstance()) {
+        getReactNativeHost().getReactInstanceManager().onWindowFocusChange(hasFocus);
+      }
+    }
+  }
+
   public void loadApp() {
     loadApp(mMainComponentName);
   }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactHost.kt

@@ -120,6 +120,9 @@ public interface ReactHost {
       data: Intent?,
   )
 
+  /* To be called when focus has changed for the hosting window. */
+  public fun onWindowFocusChange(hasFocus: Boolean)
+
   public fun addBeforeDestroyListener(onBeforeDestroy: () -> Unit)
 
   public fun removeBeforeDestroyListener(onBeforeDestroy: () -> Unit)

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/ReactHostImpl.java

@@ -650,6 +650,23 @@ public class ReactHostImpl implements ReactHost {
             "Tried to access onActivityResult while context is not ready"));
   }
 
+  /* To be called when focus has changed for the hosting window. */
+  @ThreadConfined(UI)
+  @Override
+  public void onWindowFocusChange(boolean hasFocus) {
+    final String method = "onWindowFocusChange(hasFocus = \"" + hasFocus + "\")";
+    log(method);
+
+    ReactContext currentContext = getCurrentReactContext();
+    if (currentContext != null) {
+      currentContext.onWindowFocusChange(hasFocus);
+    }
+    ReactSoftExceptionLogger.logSoftException(
+        TAG,
+        new ReactNoCrashSoftException(
+            "Tried to access onWindowFocusChange while context is not ready"));
+  }
+
   @Nullable
   JavaScriptContextHolder getJavaScriptContextHolder() {
     final ReactInstance reactInstance = mReactInstanceTaskRef.get().getResult();