New folder animations.

Added FolderAnimationManager, which manages the opening
and closing animations.

All of the animations are done in the Folder.
ie. When the users taps on the FolderIcon, we immediately hide the
FolderIcon and show the Folder inits place before starting the animation.

Bug: 35064148
Change-Id: Icacdbbf78a25489f2eab4fd352f2c6ed71eb710b

res/interpolator/folder_closing_interpolator.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+** Copyright 2017, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<pathInterpolator xmlns:android="http://schemas.android.com/apk/res/android"
+    android:controlX1="0.8"
+    android:controlY1="0"
+    android:controlX2="0.8"
+    android:controlY2="1"/>

res/interpolator/folder_opening_interpolator.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+** Copyright 2017, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<pathInterpolator xmlns:android="http://schemas.android.com/apk/res/android"
+    android:controlX1="0.2"
+    android:controlY1="0"
+    android:controlX2="0"
+    android:controlY2="1"/>

src/com/android/launcher3/BubbleTextView.java

@@ -590,6 +590,10 @@ public class BubbleTextView extends TextView implements ItemInfoUpdateReceiver {
                 .isEmpty();
     }
 
+    public int getIconSize() {
+        return mIconSize;
+    }
+
     /**
      * Interface to be implemented by the grand parent to allow click shadow effect.
      */

src/com/android/launcher3/anim/RevealOutlineAnimation.java

@@ -83,4 +83,8 @@ public abstract class RevealOutlineAnimation extends ViewOutlineProvider {
     public void getOutline(View v, Outline outline) {
         outline.setRoundRect(mOutline, mOutlineRadius);
     }
+
+    public float getRadius() {
+        return mOutlineRadius;
+    }
 }

src/com/android/launcher3/folder/Folder.java

@@ -46,6 +46,7 @@ import android.widget.TextView;
 import com.android.launcher3.AbstractFloatingView;
 import com.android.launcher3.Alarm;
 import com.android.launcher3.AppInfo;
+import com.android.launcher3.BubbleTextView;
 import com.android.launcher3.CellLayout;
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.DragSource;
@@ -82,6 +83,7 @@ import com.android.launcher3.util.Thunk;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
+import java.util.List;
 
 /**
  * Represents a set of icons chosen by the user or generated by the system.
@@ -134,8 +136,10 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
 
     @Thunk final ArrayList<View> mItemsInReadingOrder = new ArrayList<View>();
 
+    private FolderAnimationManager mFolderAnimationManager;
+
     private final int mExpandDuration;
-    private final int mMaterialExpandDuration;
+    public final int mMaterialExpandDuration;
     private final int mMaterialExpandStagger;
 
     protected final Launcher mLauncher;
@@ -476,6 +480,8 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
                 }
             }
         });
+
+        mFolderAnimationManager = new FolderAnimationManager(this);
     }
 
     /**
@@ -512,6 +518,9 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
     }
 
     private AnimatorSet getOpeningAnimatorSet() {
+        prepareReveal();
+        mFolderIcon.growAndFadeOut();
+
         AnimatorSet anim = LauncherAnimUtils.createAnimatorSet();
 
         int width = getFolderWidth();
@@ -602,12 +611,11 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
         mDeleteFolderOnDropCompleted = false;
 
         final Runnable onCompleteRunnable;
-        prepareReveal();
         centerAboutIcon();
 
-        mFolderIcon.growAndFadeOut();
+        AnimatorSet anim = FeatureFlags.LAUNCHER3_NEW_FOLDER_ANIMATION
-
+                ? mFolderAnimationManager.getOpeningAnimator()
-        AnimatorSet anim = getOpeningAnimatorSet();
+                : getOpeningAnimatorSet();
         onCompleteRunnable = new Runnable() {
             @Override
             public void run() {
@@ -705,7 +713,7 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
             mFolderName.dispatchBackKey();
         }
 
-        if (mFolderIcon != null) {
+        if (mFolderIcon != null && !FeatureFlags.LAUNCHER3_NEW_FOLDER_ANIMATION) {
             mFolderIcon.shrinkAndFadeIn(animate);
         }
 
@@ -730,12 +738,14 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
         AnimationLayerSet layerSet = new AnimationLayerSet();
         layerSet.addView(this);
         animatorSet.addListener(layerSet);
-
+        animatorSet.setDuration(mExpandDuration);
         return animatorSet;
     }
 
     private void animateClosed() {
-        AnimatorSet a = getClosingAnimatorSet();
+        AnimatorSet a = FeatureFlags.LAUNCHER3_NEW_FOLDER_ANIMATION
+                ? mFolderAnimationManager.getClosingAnimator()
+                : getClosingAnimatorSet();
         a.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
@@ -750,7 +760,6 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
                 mState = STATE_ANIMATING;
             }
         });
-        a.setDuration(mExpandDuration);
         a.start();
     }
 
@@ -1453,6 +1462,26 @@ public class Folder extends AbstractFloatingView implements DragSource, View.OnC
         return mItemsInReadingOrder;
     }
 
+    public List<BubbleTextView> getItemsOnCurrentPage() {
+        ArrayList<View> allItems = getItemsInReadingOrder();
+        int currentPage = mContent.getCurrentPage();
+        int lastPage = mContent.getPageCount() - 1;
+        int totalItemsInFolder = allItems.size();
+        int itemsPerPage = mContent.itemsPerPage();
+        int numItemsOnCurrentPage = currentPage == lastPage
+                ? totalItemsInFolder - (itemsPerPage * currentPage)
+                : itemsPerPage;
+
+        int startIndex = currentPage * itemsPerPage;
+        int endIndex = startIndex + numItemsOnCurrentPage;
+
+        List<BubbleTextView> itemsOnCurrentPage = new ArrayList<>(numItemsOnCurrentPage);
+        for (int i = startIndex; i < endIndex; ++i) {
+            itemsOnCurrentPage.add((BubbleTextView) allItems.get(i));
+        }
+        return itemsOnCurrentPage;
+    }
+
     public void onFocusChange(View v, boolean hasFocus) {
         if (v == mFolderName) {
             if (hasFocus) {

src/com/android/launcher3/folder/FolderAnimationManager.java

@@ -0,0 +1,333 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.folder;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.animation.TimeInterpolator;
+import android.content.Context;
+import android.graphics.Color;
+import android.graphics.Rect;
+import android.graphics.drawable.GradientDrawable;
+import android.support.v4.graphics.ColorUtils;
+import android.util.Property;
+import android.view.View;
+import android.view.animation.AnimationUtils;
+
+import com.android.launcher3.BubbleTextView;
+import com.android.launcher3.CellLayout;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAnimUtils;
+import com.android.launcher3.R;
+import com.android.launcher3.ShortcutAndWidgetContainer;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.anim.RoundedRectRevealOutlineProvider;
+import com.android.launcher3.dragndrop.DragLayer;
+import com.android.launcher3.util.Themes;
+
+import java.util.List;
+
+/**
+ * Manages the opening and closing animations for a {@link Folder}.
+ *
+ * All of the animations are done in the Folder.
+ * ie. When the user taps on the FolderIcon, we immediately hide the FolderIcon and show the Folder
+ * in its place before starting the animation.
+ */
+public class FolderAnimationManager {
+
+    private Folder mFolder;
+    private FolderPagedView mContent;
+    private GradientDrawable mFolderBackground;
+
+    private FolderIcon mFolderIcon;
+    private FolderIcon.PreviewBackground mPreviewBackground;
+
+    private Context mContext;
+    private Launcher mLauncher;
+
+    private Animator mRevealAnimator;
+    private final TimeInterpolator mOpeningInterpolator;
+    private final TimeInterpolator mClosingInterpolator;
+
+    private final FolderIcon.PreviewItemDrawingParams mTmpParams =
+            new FolderIcon.PreviewItemDrawingParams(0, 0, 0, 0);
+
+    private final Property<View, Float> SCALE_PROPERTY =
+            new Property<View, Float>(Float.class, "scale") {
+                @Override
+                public Float get(View view) {
+                    return view.getScaleX();
+                }
+
+                @Override
+                public void set(View view, Float scale) {
+                    view.setScaleX(scale);
+                    view.setScaleY(scale);
+                }
+            };
+
+    private final Property<List<BubbleTextView>, Integer> ITEMS_TEXT_COLOR_PROPERTY =
+            new Property<List<BubbleTextView>, Integer>(Integer.class, "textColor") {
+                @Override
+                public Integer get(List<BubbleTextView> items) {
+                    return items.get(0).getCurrentTextColor();
+                }
+
+                @Override
+                public void set(List<BubbleTextView> items, Integer color) {
+                    setItemsTextColor(items, color);
+                }
+            };
+
+    public FolderAnimationManager(Folder folder) {
+        mFolder = folder;
+        mContent = folder.mContent;
+        mFolderBackground = (GradientDrawable) mFolder.getBackground();
+
+        mFolderIcon = folder.mFolderIcon;
+        mPreviewBackground = mFolderIcon.mBackground;
+
+        mContext = folder.getContext();
+        mLauncher = folder.mLauncher;
+
+        mOpeningInterpolator = AnimationUtils.loadInterpolator(mContext,
+                R.interpolator.folder_opening_interpolator);
+        mClosingInterpolator = AnimationUtils.loadInterpolator(mContext,
+                R.interpolator.folder_closing_interpolator);
+    }
+
+    public AnimatorSet getOpeningAnimator() {
+        mFolder.setPivotX(0);
+        mFolder.setPivotY(0);
+
+        AnimatorSet a = getAnimatorSet(true /* isOpening */);
+        a.setInterpolator(mOpeningInterpolator);
+        a.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animation) {
+                mFolderIcon.setVisibility(View.INVISIBLE);
+            }
+        });
+        return a;
+    }
+
+    public AnimatorSet getClosingAnimator() {
+        AnimatorSet a = getAnimatorSet(false /* isOpening */);
+        a.setInterpolator(mClosingInterpolator);
+        a.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mFolderIcon.setVisibility(View.VISIBLE);
+            }
+        });
+        return a;
+    }
+
+    /**
+     * Prepares the Folder for animating between open / closed states.
+     *
+     * @param isOpening If true, return the animator set for the opening animation.
+     */
+    private AnimatorSet getAnimatorSet(final boolean isOpening) {
+        final DragLayer.LayoutParams lp = (DragLayer.LayoutParams) mFolder.getLayoutParams();
+        FolderIcon.PreviewLayoutRule rule = mFolderIcon.getLayoutRule();
+        final List<BubbleTextView> itemsInPreview = mFolderIcon.getItemsToDisplay();
+
+        // Match size/scale of icons in the preview
+        float previewScale = rule.scaleForItem(0, itemsInPreview.size());
+        float previewSize = rule.getIconSize() * previewScale;
+        float folderScale = previewSize / itemsInPreview.get(0).getIconSize();
+
+        final float initialScale = folderScale;
+        final float finalScale = 1f;
+        float scale = isOpening ? initialScale : finalScale;
+        mFolder.setScaleX(scale);
+        mFolder.setScaleY(scale);
+
+        // Match position of the FolderIcon
+        final Rect folderIconPos = new Rect();
+        float scaleRelativeToDragLayer = mLauncher.getDragLayer()
+                .getDescendantRectRelativeToSelf(mFolderIcon, folderIconPos);
+        folderScale *= scaleRelativeToDragLayer;
+
+        // We want to create a small X offset for the preview items, so that they follow their
+        // expected path to their final locations. ie. an icon should not move right, if it's final
+        // location is to its left. This value is arbitrarily defined.
+        final int nudgeOffsetX = (int) (previewSize / 2);
+
+        final int paddingOffsetX = (int) ((mFolder.getPaddingLeft() + mContent.getPaddingLeft())
+                * folderScale);
+        final int paddingOffsetY = (int) ((mFolder.getPaddingTop() + mContent.getPaddingTop())
+                * folderScale);
+
+        int initialX = folderIconPos.left + mFolderIcon.mBackground.getOffsetX() - paddingOffsetX
+                - nudgeOffsetX;
+        int initialY = folderIconPos.top + mFolderIcon.mBackground.getOffsetY() - paddingOffsetY;
+        final float xDistance = initialX - lp.x;
+        final float yDistance = initialY - lp.y;
+
+        // Set up the Folder background.
+        final int finalColor = Themes.getAttrColor(mContext, android.R.attr.colorPrimary);
+        final int initialColor =
+                ColorUtils.setAlphaComponent(finalColor, mPreviewBackground.getBackgroundAlpha());
+        mFolderBackground.setColor(isOpening ? initialColor : finalColor);
+
+        // Initialize the Folder items' text.
+        final List<BubbleTextView> itemsOnCurrentPage = mFolder.getItemsOnCurrentPage();
+        final int finalTextColor = Themes.getAttrColor(mContext, android.R.attr.textColorSecondary);
+        setItemsTextColor(itemsOnCurrentPage, isOpening ? Color.TRANSPARENT : finalTextColor);
+
+        // Create the animators.
+        AnimatorSet a = LauncherAnimUtils.createAnimatorSet();
+        a.setDuration(mFolder.mMaterialExpandDuration);
+
+        ObjectAnimator translationX = isOpening
+                ? ObjectAnimator.ofFloat(mFolder, View.TRANSLATION_X, xDistance, 0)
+                : ObjectAnimator.ofFloat(mFolder, View.TRANSLATION_X, 0, xDistance);
+        a.play(translationX);
+
+        ObjectAnimator translationY = isOpening
+                ? ObjectAnimator.ofFloat(mFolder, View.TRANSLATION_Y, yDistance, 0)
+                : ObjectAnimator.ofFloat(mFolder, View.TRANSLATION_Y, 0, yDistance);
+        a.play(translationY);
+
+        ObjectAnimator scaleAnimator = isOpening
+                ? ObjectAnimator.ofFloat(mFolder, SCALE_PROPERTY, initialScale, finalScale)
+                : ObjectAnimator.ofFloat(mFolder, SCALE_PROPERTY, finalScale, initialScale);
+        a.play(scaleAnimator);
+
+        ObjectAnimator itemsTextColor = isOpening
+                ? ObjectAnimator.ofArgb(itemsOnCurrentPage, ITEMS_TEXT_COLOR_PROPERTY,
+                        Color.TRANSPARENT, finalTextColor)
+                : ObjectAnimator.ofArgb(itemsOnCurrentPage, ITEMS_TEXT_COLOR_PROPERTY,
+                        finalTextColor, Color.TRANSPARENT);
+        a.play(itemsTextColor);
+
+        ObjectAnimator backgroundColor = isOpening
+                ? ObjectAnimator.ofArgb(mFolderBackground, "color", initialColor, finalColor)
+                : ObjectAnimator.ofArgb(mFolderBackground, "color", finalColor, initialColor);
+        a.play(backgroundColor);
+
+        // Set up the reveal animation that clips the Folder.
+        float stroke = mPreviewBackground.getStrokeWidth();
+        int initialSize = (int) ((mFolderIcon.mBackground.getRadius() * 2 + stroke) / folderScale);
+        int totalOffsetX = paddingOffsetX + Math.round(nudgeOffsetX / folderScale);
+        int unscaledStroke = (int) Math.floor(stroke / folderScale);
+        Rect startRect = new Rect(totalOffsetX + unscaledStroke, unscaledStroke,
+                totalOffsetX + initialSize, initialSize);
+        Rect endRect = new Rect(0, 0, lp.width, lp.height);
+        a.play(getRevealAnimator(isOpening, initialSize / 2f, startRect, endRect));
+
+        addPreviewItemAnimatorsToSet(a, isOpening, folderScale, nudgeOffsetX);
+        return a;
+    }
+
+    private Animator getRevealAnimator(boolean isOpening, float circleRadius, Rect start,
+            Rect end) {
+        boolean revealIsRunning = mRevealAnimator != null && mRevealAnimator.isRunning();
+        final float finalRadius = revealIsRunning
+                ? ((RoundedRectRevealOutlineProvider) mFolder.getOutlineProvider()).getRadius()
+                : Utilities.pxFromDp(2, mContext.getResources().getDisplayMetrics());
+        if (revealIsRunning) {
+            mRevealAnimator.cancel();
+        }
+        mRevealAnimator = new RoundedRectRevealOutlineProvider(circleRadius, finalRadius,
+                start, end).createRevealAnimator(mFolder, !isOpening);
+        return mRevealAnimator;
+    }
+
+    /**
+     * Animate the items that are displayed in the preview.
+     */
+    private void addPreviewItemAnimatorsToSet(AnimatorSet animatorSet, boolean isOpening,
+            final float folderScale, int nudgeOffsetX) {
+        FolderIcon.PreviewLayoutRule rule = mFolderIcon.getLayoutRule();
+        final List<BubbleTextView> itemsInPreview = mFolderIcon.getItemsToDisplay();
+        final int numItemsInPreview = itemsInPreview.size();
+
+        ShortcutAndWidgetContainer cwc = mContent.getPageAt(0).getShortcutsAndWidgets();
+        for (int i = 0; i < numItemsInPreview; ++i) {
+            final BubbleTextView btv = itemsInPreview.get(i);
+            CellLayout.LayoutParams btvLp = (CellLayout.LayoutParams) btv.getLayoutParams();
+
+            // Calculate the final values in the LayoutParams.
+            btvLp.isLockedToGrid = true;
+            cwc.setupLp(btv);
+
+            // Match scale of icons in the preview.
+            float previewScale = rule.scaleForItem(i, numItemsInPreview);
+            float previewSize = rule.getIconSize() * previewScale;
+            float iconScale = previewSize / itemsInPreview.get(i).getIconSize();
+
+            final float initialScale = iconScale / folderScale;
+            final float finalScale = 1f;
+            float scale = isOpening ? initialScale : finalScale;
+            btv.setScaleX(scale);
+            btv.setScaleY(scale);
+
+            // Match positions of the icons in the folder with their positions in the preview
+            rule.computePreviewItemDrawingParams(i, numItemsInPreview, mTmpParams);
+            // The PreviewLayoutRule assumes that the icon size takes up the entire width so we
+            // offset by the actual size.
+            int iconOffsetX = (int) ((btvLp.width - btv.getIconSize()) * iconScale) / 2;
+
+            final int previewPosX =
+                    (int) ((mTmpParams.transX - iconOffsetX + nudgeOffsetX) / folderScale);
+            final int previewPosY = (int) (mTmpParams.transY / folderScale);
+
+            final float xDistance = previewPosX - btvLp.x;
+            final float yDistance = previewPosY - btvLp.y;
+
+            ObjectAnimator translationX = isOpening
+                    ? ObjectAnimator.ofFloat(btv, View.TRANSLATION_X, xDistance, 0)
+                    : ObjectAnimator.ofFloat(btv, View.TRANSLATION_X, 0, xDistance);
+            animatorSet.play(translationX);
+
+            ObjectAnimator translationY = isOpening
+                    ? ObjectAnimator.ofFloat(btv, View.TRANSLATION_Y, yDistance, 0)
+                    : ObjectAnimator.ofFloat(btv, View.TRANSLATION_Y, 0, yDistance);
+            animatorSet.play(translationY);
+
+            ObjectAnimator scaleAnimator = isOpening
+                    ? ObjectAnimator.ofFloat(btv, SCALE_PROPERTY, initialScale, finalScale)
+                    : ObjectAnimator.ofFloat(btv, SCALE_PROPERTY, finalScale, initialScale);
+            animatorSet.play(scaleAnimator);
+
+            animatorSet.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    super.onAnimationEnd(animation);
+                    btv.setTranslationX(0.0f);
+                    btv.setTranslationY(0.0f);
+                    btv.setScaleX(1f);
+                    btv.setScaleY(1f);
+                }
+            });
+        }
+    }
+
+    private void setItemsTextColor(List<BubbleTextView> items, int color) {
+        int size = items.size();
+
+        for (int i = 0; i < size; ++i) {
+            items.get(i).setTextColor(color);
+        }
+    }
+}

src/com/android/launcher3/folder/FolderIcon.java

@@ -407,6 +407,10 @@ public class FolderIcon extends FrameLayout implements FolderListener {
         mBadgeInfo = badgeInfo;
     }
 
+    public PreviewLayoutRule getLayoutRule() {
+        return mPreviewLayoutRule;
+    }
+
     /**
      * Sets mBadgeScale to 1 or 0, animating if oldCount or newCount is 0
      * (the badge is being added or removed).
@@ -824,6 +828,14 @@ public class FolderIcon extends FrameLayout implements FolderListener {
             };
             animateScale(1f, 1f, onStart, onEnd);
         }
+
+        public int getBackgroundAlpha() {
+            return (int) Math.min(MAX_BG_OPACITY, BG_OPACITY * mColorMultiplier);
+        }
+
+        public float getStrokeWidth() {
+            return mStrokeWidth;
+        }
     }
 
     public void setFolderBackground(PreviewBackground bg) {
@@ -991,15 +1003,15 @@ public class FolderIcon extends FrameLayout implements FolderListener {
         return mFolderName.getVisibility() == VISIBLE;
     }
 
-    private List<View> getItemsToDisplay() {
+    public List<BubbleTextView> getItemsToDisplay() {
         mPreviewVerifier.setFolderInfo(mFolder.getInfo());
 
-        List<View> itemsToDisplay = new ArrayList<>();
+        List<BubbleTextView> itemsToDisplay = new ArrayList<>();
         List<View> allItems = mFolder.getItemsInReadingOrder();
         int numItems = allItems.size();
         for (int rank = 0; rank < numItems; ++rank) {
             if (mPreviewVerifier.isItemInPreview(rank)) {
-                itemsToDisplay.add(allItems.get(rank));
+                itemsToDisplay.add((BubbleTextView) allItems.get(rank));
             }
 
             if (itemsToDisplay.size() == FolderIcon.NUM_ITEMS_IN_PREVIEW) {
@@ -1010,7 +1022,7 @@ public class FolderIcon extends FrameLayout implements FolderListener {
     }
 
     private void updateItemDrawingParams(boolean animate) {
-        List<View> items = getItemsToDisplay();
+        List<BubbleTextView> items = getItemsToDisplay();
         int nItemsInPreview = items.size();
 
         int prevNumItems = mDrawingParams.size();
@@ -1025,7 +1037,7 @@ public class FolderIcon extends FrameLayout implements FolderListener {
 
         for (int i = 0; i < mDrawingParams.size(); i++) {
             PreviewItemDrawingParams p = mDrawingParams.get(i);
-            p.drawable = ((TextView) items.get(i)).getCompoundDrawables()[1];
+            p.drawable = items.get(i).getCompoundDrawables()[1];
 
             if (!animate || FeatureFlags.LAUNCHER3_LEGACY_FOLDER_ICON) {
                 computePreviewItemDrawingParams(i, nItemsInPreview, p);