Reset dismissal UI to the baseline when exiting the page.

Flip the card back to slice view if users exit the page instead of
getting the dismissal UI preserved. We should also reset the UI to the baseline
if users dismiss a card, so when the view is reused, slice view can
then be displayed correctly.

Change-Id: If5448c57dec44ef5c1d3472358d4ddc9398538b8
Fixes: 119820168
Test: robotests

src/com/android/settings/homepage/contextualcards/slices/SliceContextualCardRenderer.java

@@ -28,8 +28,11 @@ import android.widget.ViewFlipper;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.LiveData;
+import androidx.lifecycle.OnLifecycleEvent;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.slice.Slice;
 import androidx.slice.SliceItem;
@@ -51,13 +54,15 @@ import java.util.Set;
  * Card renderer for {@link ContextualCard} built as slices.
  */
 public class SliceContextualCardRenderer implements ContextualCardRenderer,
-        SliceView.OnSliceActionListener {
+        SliceView.OnSliceActionListener, LifecycleObserver {
     public static final int VIEW_TYPE = R.layout.homepage_slice_tile;
 
     private static final String TAG = "SliceCardRenderer";
 
     @VisibleForTesting
     final Map<String, LiveData<Slice>> mSliceLiveDataMap;
+    @VisibleForTesting
+    final Set<SliceViewHolder> mFlippedCardSet;
 
     private final Context mContext;
     private final LifecycleOwner mLifecycleOwner;
@@ -71,6 +76,8 @@ public class SliceContextualCardRenderer implements ContextualCardRenderer,
         mSliceLiveDataMap = new ArrayMap<>();
         mControllerRendererPool = controllerRendererPool;
         mCardSet = new ArraySet<>();
+        mFlippedCardSet = new ArraySet<>();
+        mLifecycleOwner.getLifecycle().addObserver(this);
     }
 
     @Override
@@ -122,20 +129,23 @@ public class SliceContextualCardRenderer implements ContextualCardRenderer,
     }
 
     private void initDismissalActions(SliceViewHolder cardHolder, ContextualCard card) {
-        final ViewFlipper viewFlipper = cardHolder.itemView.findViewById(R.id.viewFlipper);
         cardHolder.sliceView.setOnLongClickListener(v -> {
-            viewFlipper.showNext();
+            cardHolder.viewFlipper.showNext();
+            mFlippedCardSet.add(cardHolder);
             return true;
         });
 
         final Button btnKeep = cardHolder.itemView.findViewById(R.id.keep);
         btnKeep.setOnClickListener(v -> {
-            viewFlipper.showPrevious();
+            cardHolder.resetCard();
+            mFlippedCardSet.remove(cardHolder);
         });
 
         final Button btnRemove = cardHolder.itemView.findViewById(R.id.remove);
         btnRemove.setOnClickListener(v -> {
             mControllerRendererPool.getController(mContext, card.getCardType()).onDismissed(card);
+            cardHolder.resetCard();
+            mFlippedCardSet.remove(cardHolder);
         });
     }
 
@@ -158,12 +168,24 @@ public class SliceContextualCardRenderer implements ContextualCardRenderer,
         }
     }
 
+    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
+    public void onStop() {
+        mFlippedCardSet.stream().forEach(holder -> holder.resetCard());
+        mFlippedCardSet.clear();
+    }
+
     public static class SliceViewHolder extends RecyclerView.ViewHolder {
         public final SliceView sliceView;
+        public final ViewFlipper viewFlipper;
 
         public SliceViewHolder(View view) {
             super(view);
             sliceView = view.findViewById(R.id.slice_view);
+            viewFlipper = view.findViewById(R.id.viewFlipper);
+        }
+
+        public void resetCard() {
+            viewFlipper.setDisplayedChild(0);
         }
     }
 }