Fix bugs related to swipe up to home animation.

- Added ConstantState support for FolderAdaptiveIcon and
  ShiftedBitmapDrawable.
- Quick fix for NPE in Workspace#mapOverCellLayout while I investigate
  further.

Bug: 128460496
Change-Id: I5ec02e25dcf9f17aeb37928e675a033bdc8819ae

src/com/android/launcher3/Workspace.java

@@ -3084,6 +3084,10 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
     }
 
     private boolean mapOverCellLayout(boolean recurse, CellLayout layout, ItemOperator op) {
+        // TODO(b/128460496) Potential race condition where layout is not yet loaded
+        if (layout == null) {
+            return false;
+        }
         ShortcutAndWidgetContainer container = layout.getShortcutsAndWidgets();
         // map over all the shortcuts on the workspace
         final int itemCount = container.getChildCount();

src/com/android/launcher3/dragndrop/FolderAdaptiveIcon.java

@@ -19,11 +19,8 @@ package com.android.launcher3.dragndrop;
 import android.annotation.TargetApi;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
-import android.graphics.ColorFilter;
 import android.graphics.Matrix;
-import android.graphics.Paint;
 import android.graphics.Path;
-import android.graphics.PixelFormat;
 import android.graphics.Point;
 import android.graphics.drawable.AdaptiveIconDrawable;
 import android.graphics.drawable.ColorDrawable;
@@ -49,11 +46,15 @@ public class FolderAdaptiveIcon extends AdaptiveIconDrawable {
 
     private final Drawable mBadge;
     private final Path mMask;
+    private final ConstantState mConstantState;
 
     private FolderAdaptiveIcon(Drawable bg, Drawable fg, Drawable badge, Path mask) {
         super(bg, fg);
         mBadge = badge;
         mMask = mask;
+
+        mConstantState = new MyConstantState(bg.getConstantState(), fg.getConstantState(),
+                badge.getConstantState(), mask);
     }
 
     @Override
@@ -134,4 +135,35 @@ public class FolderAdaptiveIcon extends AdaptiveIconDrawable {
 
         return new FolderAdaptiveIcon(new ColorDrawable(bg.getBgColor()), foreground, badge, mask);
     }
+
+    @Override
+    public ConstantState getConstantState() {
+        return mConstantState;
+    }
+
+    private static class MyConstantState extends ConstantState {
+        private final ConstantState mBg;
+        private final ConstantState mFg;
+        private final ConstantState mBadge;
+        private final Path mMask;
+
+        MyConstantState(ConstantState bg, ConstantState fg, ConstantState badge, Path mask) {
+            mBg = bg;
+            mFg = fg;
+            mBadge = badge;
+            mMask = mask;
+        }
+
+        @Override
+        public Drawable newDrawable() {
+            return new FolderAdaptiveIcon(mBg.newDrawable(), mFg.newDrawable(),
+                    mBadge.newDrawable(), mMask);
+        }
+
+        @Override
+        public int getChangingConfigurations() {
+            return mBg.getChangingConfigurations() & mFg.getChangingConfigurations()
+                    & mBadge.getChangingConfigurations();
+        }
+    }
 }

src/com/android/launcher3/graphics/ShiftedBitmapDrawable.java

@@ -32,10 +32,14 @@ public class ShiftedBitmapDrawable extends Drawable {
     private float mShiftX;
     private float mShiftY;
 
+    private final ConstantState mConstantState;
+
     public ShiftedBitmapDrawable(Bitmap bitmap, float shiftX, float shiftY) {
         mBitmap = bitmap;
         mShiftX = shiftX;
         mShiftY = shiftY;
+
+        mConstantState = new MyConstantState(mBitmap, mShiftX, mShiftY);
     }
 
     public float getShiftX() {
@@ -71,4 +75,31 @@ public class ShiftedBitmapDrawable extends Drawable {
     public int getOpacity() {
         return PixelFormat.TRANSLUCENT;
     }
+
+    @Override
+    public ConstantState getConstantState() {
+        return mConstantState;
+    }
+
+    private static class MyConstantState extends ConstantState {
+        private final Bitmap mBitmap;
+        private float mShiftX;
+        private float mShiftY;
+
+        MyConstantState(Bitmap bitmap, float shiftX, float shiftY) {
+            mBitmap = bitmap;
+            mShiftX = shiftX;
+            mShiftY = shiftY;
+        }
+
+        @Override
+        public Drawable newDrawable() {
+            return new ShiftedBitmapDrawable(mBitmap, mShiftX, mShiftY);
+        }
+
+        @Override
+        public int getChangingConfigurations() {
+            return 0;
+        }
+    }
 }