diff --git a/WallpaperPicker/src/com/android/photos/views/Pools.java b/WallpaperPicker/src/com/android/photos/views/Pools.java
deleted file mode 100644
index c60f2f0..0000000
--- a/WallpaperPicker/src/com/android/photos/views/Pools.java
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * Copyright (C) 2009 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.photos.views;
-
-/**
- * Helper class for crating pools of objects. An example use looks like this:
- * <pre>
- * public class MyPooledClass {
- *
- *     private static final SynchronizedPool<MyPooledClass> sPool =
- *             new SynchronizedPool<MyPooledClass>(10);
- *
- *     public static MyPooledClass obtain() {
- *         MyPooledClass instance = sPool.acquire();
- *         return (instance != null) ? instance : new MyPooledClass();
- *     }
- *
- *     public void recycle() {
- *          // Clear state if needed.
- *          sPool.release(this);
- *     }
- *
- *     . . .
- * }
- * </pre>
- *
- * @hide
- */
-public final class Pools {
-
-    /**
-     * Interface for managing a pool of objects.
-     *
-     * @param <T> The pooled type.
-     */
-    public static interface Pool<T> {
-
-        /**
-         * @return An instance from the pool if such, null otherwise.
-         */
-        public T acquire();
-
-        /**
-         * Release an instance to the pool.
-         *
-         * @param instance The instance to release.
-         * @return Whether the instance was put in the pool.
-         *
-         * @throws IllegalStateException If the instance is already in the pool.
-         */
-        public boolean release(T instance);
-    }
-
-    private Pools() {
-        /* do nothing - hiding constructor */
-    }
-
-    /**
-     * Simple (non-synchronized) pool of objects.
-     *
-     * @param <T> The pooled type.
-     */
-    public static class SimplePool<T> implements Pool<T> {
-        private final Object[] mPool;
-
-        private int mPoolSize;
-
-        /**
-         * Creates a new instance.
-         *
-         * @param maxPoolSize The max pool size.
-         *
-         * @throws IllegalArgumentException If the max pool size is less than zero.
-         */
-        public SimplePool(int maxPoolSize) {
-            if (maxPoolSize <= 0) {
-                throw new IllegalArgumentException("The max pool size must be > 0");
-            }
-            mPool = new Object[maxPoolSize];
-        }
-
-        @Override
-        @SuppressWarnings("unchecked")
-        public T acquire() {
-            if (mPoolSize > 0) {
-                final int lastPooledIndex = mPoolSize - 1;
-                T instance = (T) mPool[lastPooledIndex];
-                mPool[lastPooledIndex] = null;
-                mPoolSize--;
-                return instance;
-            }
-            return null;
-        }
-
-        @Override
-        public boolean release(T instance) {
-            if (isInPool(instance)) {
-                throw new IllegalStateException("Already in the pool!");
-            }
-            if (mPoolSize < mPool.length) {
-                mPool[mPoolSize] = instance;
-                mPoolSize++;
-                return true;
-            }
-            return false;
-        }
-
-        private boolean isInPool(T instance) {
-            for (int i = 0; i < mPoolSize; i++) {
-                if (mPool[i] == instance) {
-                    return true;
-                }
-            }
-            return false;
-        }
-    }
-
-    /**
-     * Synchronized) pool of objects.
-     *
-     * @param <T> The pooled type.
-     */
-    public static class SynchronizedPool<T> extends SimplePool<T> {
-        private final Object mLock = new Object();
-
-        /**
-         * Creates a new instance.
-         *
-         * @param maxPoolSize The max pool size.
-         *
-         * @throws IllegalArgumentException If the max pool size is less than zero.
-         */
-        public SynchronizedPool(int maxPoolSize) {
-            super(maxPoolSize);
-        }
-
-        @Override
-        public T acquire() {
-            synchronized (mLock) {
-                return super.acquire();
-            }
-        }
-
-        @Override
-        public boolean release(T element) {
-            synchronized (mLock) {
-                return super.release(element);
-            }
-        }
-    }
-}
\ No newline at end of file
diff --git a/WallpaperPicker/src/com/android/photos/views/TiledImageRenderer.java b/WallpaperPicker/src/com/android/photos/views/TiledImageRenderer.java
index 39a73b9..e57ce70 100644
--- a/WallpaperPicker/src/com/android/photos/views/TiledImageRenderer.java
+++ b/WallpaperPicker/src/com/android/photos/views/TiledImageRenderer.java
@@ -20,6 +20,8 @@
 import android.graphics.Bitmap;
 import android.graphics.Rect;
 import android.graphics.RectF;
+import android.support.v4.util.Pools.Pool;
+import android.support.v4.util.Pools.SynchronizedPool;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.LongSparseArray;
@@ -31,8 +33,6 @@
 import com.android.gallery3d.glrenderer.GLCanvas;
 import com.android.gallery3d.glrenderer.UploadedTexture;
 import com.android.launcher3.util.Thunk;
-import com.android.photos.views.Pools.Pool;
-import com.android.photos.views.Pools.SynchronizedPool;
 
 /**
  * Handles laying out, decoding, and drawing of tiles in GL