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diff --git a/src/com/android/launcher3/allapps/AllAppsBackgroundDrawable.java b/src/com/android/launcher3/allapps/AllAppsBackgroundDrawable.java
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+/*
+ * Copyright (C) 2015 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.allapps;
+
+import android.animation.ObjectAnimator;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+
+import android.view.Gravity;
+import com.android.launcher3.R;
+
+/**
+ * A helper class to positon and orient a drawable to be drawn.
+ */
+class TransformedImageDrawable {
+ private Drawable mImage;
+ private float mXPercent;
+ private float mYPercent;
+ private int mGravity;
+
+ /**
+ * @param gravity If one of the Gravity center values, the x and y offset will take the width
+ * and height of the image into account to center the image to the offset.
+ */
+ public TransformedImageDrawable(Resources res, int resourceId, float xPct, float yPct,
+ int gravity) {
+ mImage = res.getDrawable(resourceId);
+ mXPercent = xPct;
+ mYPercent = yPct;
+ mGravity = gravity;
+ }
+
+ public void setAlpha(int alpha) {
+ mImage.setAlpha(alpha);
+ }
+
+ public int getAlpha() {
+ return mImage.getAlpha();
+ }
+
+ public void updateBounds(Rect bounds) {
+ int width = mImage.getIntrinsicWidth();
+ int height = mImage.getIntrinsicHeight();
+ int left = bounds.left + (int) (mXPercent * bounds.width());
+ int top = bounds.top + (int) (mYPercent * bounds.height());
+ if ((mGravity & Gravity.CENTER_HORIZONTAL) == Gravity.CENTER_HORIZONTAL) {
+ left -= (width / 2);
+ }
+ if ((mGravity & Gravity.CENTER_VERTICAL) == Gravity.CENTER_VERTICAL) {
+ top -= (height / 2);
+ }
+ mImage.setBounds(left, top, left + width, top + height);
+ }
+
+ public void draw(Canvas canvas) {
+ int c = canvas.save(Canvas.MATRIX_SAVE_FLAG);
+ mImage.draw(canvas);
+ canvas.restoreToCount(c);
+ }
+}
+
+/**
+ * This is a custom composite drawable that has a fixed virtual size and dynamically lays out its
+ * children images relatively within its bounds. This way, we can reduce the memory usage of a
+ * single, large sparsely populated image.
+ */
+public class AllAppsBackgroundDrawable extends Drawable {
+
+ private final TransformedImageDrawable mHand;
+ private final TransformedImageDrawable[] mIcons;
+ private final int mWidth;
+ private final int mHeight;
+
+ private ObjectAnimator mBackgroundAnim;
+
+ public AllAppsBackgroundDrawable(Context context) {
+ Resources res = context.getResources();
+ mHand = new TransformedImageDrawable(res, R.drawable.ic_all_apps_bg_hand,
+ 0.575f, 0.1f, Gravity.CENTER_HORIZONTAL);
+ mIcons = new TransformedImageDrawable[4];
+ mIcons[0] = new TransformedImageDrawable(res, R.drawable.ic_all_apps_bg_icon_1,
+ 0.375f, 0, Gravity.CENTER_HORIZONTAL);
+ mIcons[1] = new TransformedImageDrawable(res, R.drawable.ic_all_apps_bg_icon_2,
+ 0.3125f, 0.25f, Gravity.CENTER_HORIZONTAL);
+ mIcons[2] = new TransformedImageDrawable(res, R.drawable.ic_all_apps_bg_icon_3,
+ 0.475f, 0.4f, Gravity.CENTER_HORIZONTAL);
+ mIcons[3] = new TransformedImageDrawable(res, R.drawable.ic_all_apps_bg_icon_4,
+ 0.7f, 0.125f, Gravity.CENTER_HORIZONTAL);
+ mWidth = res.getDimensionPixelSize(R.dimen.all_apps_background_canvas_width);
+ mHeight = res.getDimensionPixelSize(R.dimen.all_apps_background_canvas_height);
+ }
+
+ /**
+ * Animates the background alpha.
+ */
+ public void animateBgAlpha(float finalAlpha, int duration) {
+ int finalAlphaI = (int) (finalAlpha * 255f);
+ if (getAlpha() != finalAlphaI) {
+ mBackgroundAnim = cancelAnimator(mBackgroundAnim);
+ mBackgroundAnim = ObjectAnimator.ofInt(this, "alpha", finalAlphaI);
+ mBackgroundAnim.setDuration(duration);
+ mBackgroundAnim.start();
+ }
+ }
+
+ /**
+ * Sets the background alpha immediately.
+ */
+ public void setBgAlpha(float finalAlpha) {
+ int finalAlphaI = (int) (finalAlpha * 255f);
+ if (getAlpha() != finalAlphaI) {
+ mBackgroundAnim = cancelAnimator(mBackgroundAnim);
+ setAlpha(finalAlphaI);
+ }
+ }
+
+ @Override
+ public int getIntrinsicWidth() {
+ return mWidth;
+ }
+
+ @Override
+ public int getIntrinsicHeight() {
+ return mHeight;
+ }
+
+ @Override
+ public void draw(Canvas canvas) {
+ mHand.draw(canvas);
+ for (int i = 0; i < mIcons.length; i++) {
+ mIcons[i].draw(canvas);
+ }
+ }
+
+ @Override
+ protected void onBoundsChange(Rect bounds) {
+ super.onBoundsChange(bounds);
+ mHand.updateBounds(bounds);
+ for (int i = 0; i < mIcons.length; i++) {
+ mIcons[i].updateBounds(bounds);
+ }
+ invalidateSelf();
+ }
+
+ @Override
+ public void setAlpha(int alpha) {
+ mHand.setAlpha(alpha);
+ for (int i = 0; i < mIcons.length; i++) {
+ mIcons[i].setAlpha(alpha);
+ }
+ invalidateSelf();
+ }
+
+ @Override
+ public int getAlpha() {
+ return mHand.getAlpha();
+ }
+
+ @Override
+ public void setColorFilter(ColorFilter colorFilter) {
+ // Do nothing
+ }
+
+ @Override
+ public int getOpacity() {
+ return PixelFormat.TRANSLUCENT;
+ }
+
+ private ObjectAnimator cancelAnimator(ObjectAnimator animator) {
+ if (animator != null) {
+ animator.removeAllListeners();
+ animator.cancel();
+ }
+ return null;
+ }
+}