Minor refactor: move flutterViewConvertedToImageView to FlutterView from PlatformViewsController.

shell/platform/android/io/flutter/embedding/android/FlutterView.java

@@ -135,6 +135,8 @@ public class FlutterView extends FrameLayout implements MouseCursorPlugin.MouseC
   private final FlutterRenderer.ViewportMetrics viewportMetrics =
       new FlutterRenderer.ViewportMetrics();
 
+  // Tracks whether the flutterView has been converted to use a FlutterImageView.
+  private boolean hasConvertedToImageView = false;
   private final AccessibilityBridge.OnAccessibilityChangeListener onAccessibilityChangeListener =
       new AccessibilityBridge.OnAccessibilityChangeListener() {
         @Override
@@ -406,6 +408,15 @@ public boolean hasRenderedFirstFrame() {
     return isFlutterUiDisplayed;
   }
 
+  /**
+   * Whether this {@code FlutterView} has been converted to use a {@link FlutterImageView}.
+   *
+   * <p>Returns ture if the surface is rendered by a {@link FlutterImageView}.
+   */
+  public boolean hasConvertedToImageView() {
+    return hasConvertedToImageView;
+  }
+
   /**
    * Adds the given {@code listener} to this {@code FlutterView}, to be notified upon Flutter's
    * first rendered frame.
@@ -1264,6 +1275,8 @@ public void detachFromFlutterEngine() {
       removeView(flutterImageView);
       flutterImageView = null;
     }
+
+    hasConvertedToImageView = false;
     previousRenderSurface = null;
     flutterEngine = null;
   }
@@ -1280,6 +1293,10 @@ public FlutterImageView createImageView() {
    * Otherwise, it resizes the {@link FlutterImageView} based on the current view size.
    */
   public void convertToImageView() {
+    if (hasConvertedToImageView) {
+      return;
+    }
+
     renderSurface.pause();
 
     if (flutterImageView == null) {
@@ -1294,6 +1311,8 @@ public void convertToImageView() {
     if (flutterEngine != null) {
       renderSurface.attachToRenderer(flutterEngine.getRenderer());
     }
+
+    hasConvertedToImageView = true;
   }
 
   /**
@@ -1314,6 +1333,8 @@ public void revertImageView(@NonNull Runnable onDone) {
     }
     renderSurface = previousRenderSurface;
     previousRenderSurface = null;
+    hasConvertedToImageView = false;
+
     if (flutterEngine == null) {
       flutterImageView.detachFromRenderer();
       onDone.run();

shell/platform/android/io/flutter/plugin/platform/PlatformViewsController.java

@@ -102,9 +102,6 @@ public class PlatformViewsController implements PlatformViewsAccessibilityDelega
   // Next available unique ID for use in overlayLayerViews.
   private int nextOverlayLayerId = 0;
 
-  // Tracks whether the flutterView has been converted to use a FlutterImageView.
-  private boolean flutterViewConvertedToImageView = false;
-
   // When adding platform views using Hybrid Composition, the engine converts the render surface
   // to a FlutterImageView to help improve animation synchronization on Android. This flag allows
   // disabling this conversion through the PlatformView platform channel.
@@ -510,7 +507,6 @@ public void detachFromView() {
     destroyOverlaySurfaces();
     removeOverlaySurfaces();
     this.flutterView = null;
-    flutterViewConvertedToImageView = false;
 
     // Inform all existing platform views that they are no longer associated with
     // a Flutter View.
@@ -726,9 +722,8 @@ private void flushAllViews() {
   }
 
   private void initializeRootImageViewIfNeeded() {
-    if (synchronizeToNativeViewHierarchy && !flutterViewConvertedToImageView) {
+    if (synchronizeToNativeViewHierarchy) {
       flutterView.convertToImageView();
-      flutterViewConvertedToImageView = true;
     }
   }
 
@@ -863,8 +858,7 @@ public void onEndFrame() {
     // then revert the image view surface and use the previous surface.
     //
     // Otherwise, acquire the latest image.
-    if (flutterViewConvertedToImageView && currentFrameUsedPlatformViewIds.isEmpty()) {
-      flutterViewConvertedToImageView = false;
+    if (flutterView.hasConvertedToImageView() && currentFrameUsedPlatformViewIds.isEmpty()) {
       flutterView.revertImageView(
           () -> {
             // Destroy overlay surfaces once the surface reversion is completed.
@@ -882,7 +876,7 @@ public void onEndFrame() {
     // dropped.
     // For example, a toolbar widget painted by Flutter may not be rendered.
     final boolean isFrameRenderedUsingImageReaders =
-        flutterViewConvertedToImageView && flutterView.acquireLatestImageViewFrame();
+        flutterView.hasConvertedToImageView() && flutterView.acquireLatestImageViewFrame();
     finishFrame(isFrameRenderedUsingImageReaders);
   }
 
@@ -899,7 +893,7 @@ private void finishFrame(boolean isFrameRenderedUsingImageReaders) {
         // If the background surface isn't rendered by the image view, then the
         // overlay surfaces can be detached from the rendered.
         // This releases resources used by the ImageReader.
-        if (!flutterViewConvertedToImageView) {
+        if (!flutterView.hasConvertedToImageView()) {
           overlayView.detachFromRenderer();
         }
         // Hide overlay surfaces that aren't rendered in the current frame.

shell/platform/android/test/io/flutter/embedding/android/FlutterViewTest.java

@@ -131,9 +131,11 @@ public void detachFromFlutterEngine_revertImageView() {
 
     flutterView.convertToImageView();
     assertTrue(flutterView.renderSurface instanceof FlutterImageView);
+    assertTrue(flutterView.hasConvertedToImageView());
 
     flutterView.detachFromFlutterEngine();
     assertFalse(flutterView.renderSurface instanceof FlutterImageView);
+    assertFalse(flutterView.hasConvertedToImageView());
   }
 
   @Test