Fix translation animation flash for the same translation

The system received the same multiple translation responses in a very
short time. We use a isShowingTranslation flag to determine if the
duplicated responses to call onShowTranslation. However the
isShowingTransation flag is set in a post runnable, this may cause the
system  allow the duplicate responses can call onShowTranslation
because the isShowingTransaltion isn't set true yet.

Use multiple flags isShowingTranslation and a new isRunningAnimation
to check if the same translation response should skip to call
onShowTranslation.

Bug: 207457172
Test: manual
Test: atest CtsTranslationTestCases
Change-Id: I7003b7f49fc0a8ce2e909228bcb89acedee6d3d0

core/java/android/view/translation/UiTranslationController.java

@@ -435,7 +435,10 @@ public class UiTranslationController {
                     if (view.getViewTranslationResponse() != null
                             && view.getViewTranslationResponse().equals(response)) {
                         if (callback instanceof TextViewTranslationCallback) {
-                            if (((TextViewTranslationCallback) callback).isShowingTranslation()) {
+                            TextViewTranslationCallback textViewCallback =
+                                    (TextViewTranslationCallback) callback;
+                            if (textViewCallback.isShowingTranslation()
+                                    || textViewCallback.isAnimationRunning()) {
                                 if (DEBUG) {
                                     Log.d(TAG, "Duplicate ViewTranslationResponse for " + autofillId
                                             + ". Ignoring.");

core/java/android/widget/TextViewTranslationCallback.java

@@ -46,6 +46,7 @@ public class TextViewTranslationCallback implements ViewTranslationCallback {
 
     private TranslationTransformationMethod mTranslationTransformation;
     private boolean mIsShowingTranslation = false;
+    private boolean mAnimationRunning = false;
     private boolean mIsTextPaddingEnabled = false;
     private CharSequence mPaddedText;
     private int mAnimationDurationMillis = 250; // default value
@@ -92,6 +93,7 @@ public class TextViewTranslationCallback implements ViewTranslationCallback {
                 (TextView) view,
                 () -> {
                     mIsShowingTranslation = true;
+                    mAnimationRunning = false;
                     // TODO(b/178353965): well-handle setTransformationMethod.
                     ((TextView) view).setTransformationMethod(transformation);
                 });
@@ -124,6 +126,7 @@ public class TextViewTranslationCallback implements ViewTranslationCallback {
                     (TextView) view,
                     () -> {
                         mIsShowingTranslation = false;
+                        mAnimationRunning = false;
                         ((TextView) view).setTransformationMethod(transformation);
                     });
             if (!TextUtils.isEmpty(mContentDescription)) {
@@ -162,6 +165,13 @@ public class TextViewTranslationCallback implements ViewTranslationCallback {
         return mIsShowingTranslation;
     }
 
+    /**
+     * Returns whether the view is running animation to show or hide the translation.
+     */
+    public boolean isAnimationRunning() {
+        return mAnimationRunning;
+    }
+
     @Override
     public void enableContentPadding() {
         mIsTextPaddingEnabled = true;
@@ -230,6 +240,7 @@ public class TextViewTranslationCallback implements ViewTranslationCallback {
             mAnimator.end();
             // Note: mAnimator is now null; do not use again here.
         }
+        mAnimationRunning = true;
         int fadedOutColor = colorWithAlpha(view.getCurrentTextColor(), 0);
         mAnimator = ValueAnimator.ofArgb(view.getCurrentTextColor(), fadedOutColor);
         mAnimator.addUpdateListener(