fix memory leak in Android (#35889)

Summary:
fix memory leak in Android
The issues link: #35890
Explain Defect
since 0.65, when call dispatchViewUpdates, we add judge mNumRootViews>0
<img width="531" alt="image" src="https://user-images.githubusercontent.com/20136688/213394240-4c284df4-27de-494e-8eed-8e5f30796cce.png">
When we call removeRootView, it will decrease the mNumRootViews before dispatchViewUpdates
<img width="430" alt="image" src="https://user-images.githubusercontent.com/20136688/213394611-d47ab49f-fc7a-4dd1-9836-fe667d655660.png">
So when we remove the last rootview, it will skip call dispatchViewUpdates and do not remove it, it will cause memory leak
Explain Fix
We should use the original root view num to judge, we can get it from NativeViewHierarchyManager

## Changelog
[ANDROID] [FIXED] - fix memory leak in Android
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Pull Request resolved: #35889

Reviewed By: christophpurrer

Differential Revision: D42636805

Pulled By: sshic

fbshipit-source-id: 76845b5c1fbdeaf1ebe990356e82059dc1e5b46e

ReactAndroid/src/main/java/com/facebook/react/uimanager/NativeViewHierarchyManager.java

@@ -666,6 +666,15 @@ public synchronized void removeRootView(int rootViewTag) {
     mRootTags.delete(rootViewTag);
   }
 
+  /**
+   * Return root view num
+   *
+   * @return The num of root view
+   */
+  public synchronized int getRootViewNum() {
+    return mRootTags.size();
+  }
+
   /**
    * Returns true on success, false on failure. If successful, after calling, output buffer will be
    * {x, y, width, height}.

ReactAndroid/src/main/java/com/facebook/react/uimanager/UIImplementation.java

@@ -170,6 +170,15 @@ public void removeRootView(int rootViewTag) {
     mOperationsQueue.enqueueRemoveRootView(rootViewTag);
   }
 
+  /**
+   * Return root view num
+   *
+   * @return The num of root view
+   */
+  private int getRootViewNum() {
+    return mOperationsQueue.getNativeViewHierarchyManager().getRootViewNum();
+  }
+
   /** Unregisters a root node with a given tag from the shadow node registry */
   public void removeRootShadowNode(int rootViewTag) {
     synchronized (uiImplementationThreadLock) {
@@ -599,6 +608,12 @@ public void measureLayoutRelativeToParent(
 
   /** Invoked at the end of the transaction to commit any updates to the node hierarchy. */
   public void dispatchViewUpdates(int batchId) {
+    if (getRootViewNum() <= 0) {
+      // If there are no RootViews registered, there will be no View updates to dispatch.
+      // This is a hack to prevent this from being called when Fabric is used everywhere.
+      // This should no longer be necessary in Bridgeless Mode.
+      return;
+    }
     SystraceMessage.beginSection(
             Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "UIImplementation.dispatchViewUpdates")
         .arg("batchId", batchId)

ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModule.java

@@ -113,7 +113,6 @@ public interface CustomEventNamesResolver {
   private volatile int mViewManagerConstantsCacheSize;
 
   private int mBatchId = 0;
-  private int mNumRootViews = 0;
 
   public UIManagerModule(
       ReactApplicationContext reactContext,
@@ -403,7 +402,6 @@ public <T extends View> int addRootView(
             -1);
 
     mUIImplementation.registerRootView(rootView, tag, themedRootContext);
-    mNumRootViews++;
     Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
     return tag;
   }
@@ -427,7 +425,6 @@ public void stopSurface(final int surfaceId) {
   @ReactMethod
   public void removeRootView(int rootViewTag) {
     mUIImplementation.removeRootView(rootViewTag);
-    mNumRootViews--;
   }
 
   public void updateNodeSize(int nodeViewTag, int newWidth, int newHeight) {
@@ -768,12 +765,7 @@ public void onBatchComplete() {
       listener.willDispatchViewUpdates(this);
     }
     try {
-      // If there are no RootViews registered, there will be no View updates to dispatch.
-      // This is a hack to prevent this from being called when Fabric is used everywhere.
-      // This should no longer be necessary in Bridgeless Mode.
-      if (mNumRootViews > 0) {
-        mUIImplementation.dispatchViewUpdates(batchId);
-      }
+      mUIImplementation.dispatchViewUpdates(batchId);
     } finally {
       Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
     }