diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/.gitignore b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/.gitignore
new file mode 100644
index 0000000..6eb878d
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/.gitignore
@@ -0,0 +1,16 @@
+# Copyright 2013 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.
+src/template/
+src/common/
+build.gradle
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/proguard-project.txt b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/proguard-project.txt
new file mode 100644
index 0000000..0d8f171
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/proguard-project.txt
@@ -0,0 +1,20 @@
+ To enable ProGuard in your project, edit project.properties
+# to define the proguard.config property as described in that file.
+#
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in ${sdk.dir}/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the ProGuard
+# include property in project.properties.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/AndroidManifest.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..23db308
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/AndroidManifest.xml
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2013 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.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.android.displayingbitmaps"
+    android:versionCode="1"
+    android:versionName="1.0">
+
+    <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="19" />
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <application android:allowBackup="true"
+        android:label="@string/app_name"
+        android:description="@string/intro_message"
+        android:icon="@drawable/ic_launcher"
+        android:theme="@style/AppThemeDark">
+
+        <activity android:name=".ui.ImageGridActivity"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <activity
+            android:name=".ui.ImageDetailActivity"
+            android:label="@string/app_name"
+            android:parentActivityName=".ui.ImageGridActivity"
+            android:theme="@style/AppThemeDark.FullScreen" >
+            <meta-data android:name="android.support.PARENT_ACTIVITY"
+                android:value=".ui.ImageGridActivity" />
+        </activity>
+
+    </application>
+
+</manifest>
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/provider/Images.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/provider/Images.java
new file mode 100644
index 0000000..5a89546
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/provider/Images.java
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.provider;
+
+/**
+ * Some simple test data to use for this sample app.
+ */
+public class Images {
+
+    /**
+     * This are PicasaWeb URLs and could potentially change. Ideally the PicasaWeb API should be
+     * used to fetch the URLs.
+     *
+     * Credit to Romain Guy for the photos:
+     * http://www.curious-creature.org/
+     * https://plus.google.com/109538161516040592207/about
+     * http://www.flickr.com/photos/romainguy
+     */
+    public final static String[] imageUrls = new String[] {
+            "https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s1024/A%252520Photographer.jpg",
+            "https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s1024/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg",
+            "https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s1024/Another%252520Rockaway%252520Sunset.jpg",
+            "https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s1024/Antelope%252520Butte.jpg",
+            "https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s1024/Antelope%252520Hallway.jpg",
+            "https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s1024/Antelope%252520Walls.jpg",
+            "https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s1024/Apre%2525CC%252580s%252520la%252520Pluie.jpg",
+            "https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s1024/Backlit%252520Cloud.jpg",
+            "https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s1024/Bee%252520and%252520Flower.jpg",
+            "https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s1024/Bonzai%252520Rock%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s1024/Caterpillar.jpg",
+            "https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s1024/Chess.jpg",
+            "https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s1024/Chihuly.jpg",
+            "https://lh5.googleusercontent.com/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s1024/Closed%252520Door.jpg",
+            "https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s1024/Colorado%252520River%252520Sunset.jpg",
+            "https://lh3.googleusercontent.com/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s1024/Colors%252520of%252520Autumn.jpg",
+            "https://lh4.googleusercontent.com/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s1024/Countryside.jpg",
+            "https://lh4.googleusercontent.com/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s1024/Death%252520Valley%252520-%252520Dunes.jpg",
+            "https://lh6.googleusercontent.com/-ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s1024/Delicate%252520Arch.jpg",
+            "https://lh5.googleusercontent.com/-Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s1024/Despair.jpg",
+            "https://lh5.googleusercontent.com/-gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s1024/Eagle%252520Fall%252520Sunrise.jpg",
+            "https://lh3.googleusercontent.com/-hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s1024/Electric%252520Storm.jpg",
+            "https://lh5.googleusercontent.com/-PyY_yiyjPTo/URqunUOhHFI/AAAAAAAAAbs/azZoULNuJXc/s1024/False%252520Kiva.jpg",
+            "https://lh6.googleusercontent.com/-PYvLVdvXywk/URqunwd8hfI/AAAAAAAAAbs/qiMwgkFvf6I/s1024/Fitzgerald%252520Streaks.jpg",
+            "https://lh4.googleusercontent.com/-KIR_UobIIqY/URquoCZ9SlI/AAAAAAAAAbs/Y4d4q8sXu4c/s1024/Foggy%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-9lzOk_OWZH0/URquoo4xYoI/AAAAAAAAAbs/AwgzHtNVCwU/s1024/Frantic.jpg",
+            "https://lh3.googleusercontent.com/-0X3JNaKaz48/URqupH78wpI/AAAAAAAAAbs/lHXxu_zbH8s/s1024/Golden%252520Gate%252520Afternoon.jpg",
+            "https://lh6.googleusercontent.com/-95sb5ag7ABc/URqupl95RDI/AAAAAAAAAbs/g73R20iVTRA/s1024/Golden%252520Gate%252520Fog.jpg",
+            "https://lh3.googleusercontent.com/-JB9v6rtgHhk/URqup21F-zI/AAAAAAAAAbs/64Fb8qMZWXk/s1024/Golden%252520Grass.jpg",
+            "https://lh4.googleusercontent.com/-EIBGfnuLtII/URquqVHwaRI/AAAAAAAAAbs/FA4McV2u8VE/s1024/Grand%252520Teton.jpg",
+            "https://lh4.googleusercontent.com/-WoMxZvmN9nY/URquq1v2AoI/AAAAAAAAAbs/grj5uMhL6NA/s1024/Grass%252520Closeup.jpg",
+            "https://lh3.googleusercontent.com/-6hZiEHXx64Q/URqurxvNdqI/AAAAAAAAAbs/kWMXM3o5OVI/s1024/Green%252520Grass.jpg",
+            "https://lh5.googleusercontent.com/-6LVb9OXtQ60/URquteBFuKI/AAAAAAAAAbs/4F4kRgecwFs/s1024/Hanging%252520Leaf.jpg",
+            "https://lh4.googleusercontent.com/-zAvf__52ONk/URqutT_IuxI/AAAAAAAAAbs/D_bcuc0thoU/s1024/Highway%2525201.jpg",
+            "https://lh6.googleusercontent.com/-H4SrUg615rA/URquuL27fXI/AAAAAAAAAbs/4aEqJfiMsOU/s1024/Horseshoe%252520Bend%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-JhFi4fb_Pqw/URquuX-QXbI/AAAAAAAAAbs/IXpYUxuweYM/s1024/Horseshoe%252520Bend.jpg",
+            "https://lh5.googleusercontent.com/-UGgssvFRJ7g/URquueyJzGI/AAAAAAAAAbs/yYIBlLT0toM/s1024/Into%252520the%252520Blue.jpg",
+            "https://lh3.googleusercontent.com/-CH7KoupI7uI/URquu0FF__I/AAAAAAAAAbs/R7GDmI7v_G0/s1024/Jelly%252520Fish%2525202.jpg",
+            "https://lh4.googleusercontent.com/-pwuuw6yhg8U/URquvPxR3FI/AAAAAAAAAbs/VNGk6f-tsGE/s1024/Jelly%252520Fish%2525203.jpg",
+            "https://lh5.googleusercontent.com/-GoUQVw1fnFw/URquv6xbC0I/AAAAAAAAAbs/zEUVTQQ43Zc/s1024/Kauai.jpg",
+            "https://lh6.googleusercontent.com/-8QdYYQEpYjw/URquwvdh88I/AAAAAAAAAbs/cktDy-ysfHo/s1024/Kyoto%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-vPeekyDjOE0/URquwzJ28qI/AAAAAAAAAbs/qxcyXULsZrg/s1024/Lake%252520Tahoe%252520Colors.jpg",
+            "https://lh4.googleusercontent.com/-xBPxWpD4yxU/URquxWHk8AI/AAAAAAAAAbs/ARDPeDYPiMY/s1024/Lava%252520from%252520the%252520Sky.jpg",
+            "https://lh3.googleusercontent.com/-897VXrJB6RE/URquxxxd-5I/AAAAAAAAAbs/j-Cz4T4YvIw/s1024/Leica%25252050mm%252520Summilux.jpg",
+            "https://lh5.googleusercontent.com/-qSJ4D4iXzGo/URquyDWiJ1I/AAAAAAAAAbs/k2pBXeWehOA/s1024/Leica%25252050mm%252520Summilux.jpg",
+            "https://lh6.googleusercontent.com/-dwlPg83vzLg/URquylTVuFI/AAAAAAAAAbs/G6SyQ8b4YsI/s1024/Leica%252520M8%252520%252528Front%252529.jpg",
+            "https://lh3.googleusercontent.com/-R3_EYAyJvfk/URquzQBv8eI/AAAAAAAAAbs/b9xhpUM3pEI/s1024/Light%252520to%252520Sand.jpg",
+            "https://lh3.googleusercontent.com/-fHY5h67QPi0/URqu0Cp4J1I/AAAAAAAAAbs/0lG6m94Z6vM/s1024/Little%252520Bit%252520of%252520Paradise.jpg",
+            "https://lh5.googleusercontent.com/-TzF_LwrCnRM/URqu0RddPOI/AAAAAAAAAbs/gaj2dLiuX0s/s1024/Lone%252520Pine%252520Sunset.jpg",
+            "https://lh3.googleusercontent.com/-4HdpJ4_DXU4/URqu046dJ9I/AAAAAAAAAbs/eBOodtk2_uk/s1024/Lonely%252520Rock.jpg",
+            "https://lh6.googleusercontent.com/-erbF--z-W4s/URqu1ajSLkI/AAAAAAAAAbs/xjDCDO1INzM/s1024/Longue%252520Vue.jpg",
+            "https://lh6.googleusercontent.com/-0CXJRdJaqvc/URqu1opNZNI/AAAAAAAAAbs/PFB2oPUU7Lk/s1024/Look%252520Me%252520in%252520the%252520Eye.jpg",
+            "https://lh3.googleusercontent.com/-D_5lNxnDN6g/URqu2Tk7HVI/AAAAAAAAAbs/p0ddca9W__Y/s1024/Lost%252520in%252520a%252520Field.jpg",
+            "https://lh6.googleusercontent.com/-flsqwMrIk2Q/URqu24PcmjI/AAAAAAAAAbs/5ocIH85XofM/s1024/Marshall%252520Beach%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-Y4lgryEVTmU/URqu28kG3gI/AAAAAAAAAbs/OjXpekqtbJ4/s1024/Mono%252520Lake%252520Blue.jpg",
+            "https://lh4.googleusercontent.com/-AaHAJPmcGYA/URqu3PIldHI/AAAAAAAAAbs/lcTqk1SIcRs/s1024/Monument%252520Valley%252520Overlook.jpg",
+            "https://lh4.googleusercontent.com/-vKxfdQ83dQA/URqu31Yq_BI/AAAAAAAAAbs/OUoGk_2AyfM/s1024/Moving%252520Rock.jpg",
+            "https://lh5.googleusercontent.com/-CG62QiPpWXg/URqu4ia4vRI/AAAAAAAAAbs/0YOdqLAlcAc/s1024/Napali%252520Coast.jpg",
+            "https://lh6.googleusercontent.com/-wdGrP5PMmJQ/URqu5PZvn7I/AAAAAAAAAbs/m0abEcdPXe4/s1024/One%252520Wheel.jpg",
+            "https://lh6.googleusercontent.com/-6WS5DoCGuOA/URqu5qx1UgI/AAAAAAAAAbs/giMw2ixPvrY/s1024/Open%252520Sky.jpg",
+            "https://lh6.googleusercontent.com/-u8EHKj8G8GQ/URqu55sM6yI/AAAAAAAAAbs/lIXX_GlTdmI/s1024/Orange%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-74Z5qj4bTDE/URqu6LSrJrI/AAAAAAAAAbs/XzmVkw90szQ/s1024/Orchid.jpg",
+            "https://lh6.googleusercontent.com/-lEQE4h6TePE/URqu6t_lSkI/AAAAAAAAAbs/zvGYKOea_qY/s1024/Over%252520there.jpg",
+            "https://lh5.googleusercontent.com/-cauH-53JH2M/URqu66v_USI/AAAAAAAAAbs/EucwwqclfKQ/s1024/Plumes.jpg",
+            "https://lh3.googleusercontent.com/-eDLT2jHDoy4/URqu7axzkAI/AAAAAAAAAbs/iVZE-xJ7lZs/s1024/Rainbokeh.jpg",
+            "https://lh5.googleusercontent.com/-j1NLqEFIyco/URqu8L1CGcI/AAAAAAAAAbs/aqZkgX66zlI/s1024/Rainbow.jpg",
+            "https://lh5.googleusercontent.com/-DRnqmK0t4VU/URqu8XYN9yI/AAAAAAAAAbs/LgvF_592WLU/s1024/Rice%252520Fields.jpg",
+            "https://lh3.googleusercontent.com/-hwh1v3EOGcQ/URqu8qOaKwI/AAAAAAAAAbs/IljRJRnbJGw/s1024/Rockaway%252520Fire%252520Sky.jpg",
+            "https://lh5.googleusercontent.com/-wjV6FQk7tlk/URqu9jCQ8sI/AAAAAAAAAbs/RyYUpdo-c9o/s1024/Rockaway%252520Flow.jpg",
+            "https://lh6.googleusercontent.com/-6cAXNfo7D20/URqu-BdzgPI/AAAAAAAAAbs/OmsYllzJqwo/s1024/Rockaway%252520Sunset%252520Sky.jpg",
+            "https://lh3.googleusercontent.com/-sl8fpGPS-RE/URqu_BOkfgI/AAAAAAAAAbs/Dg2Fv-JxOeg/s1024/Russian%252520Ridge%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-gVtY36mMBIg/URqu_q91lkI/AAAAAAAAAbs/3CiFMBcy5MA/s1024/Rust%252520Knot.jpg",
+            "https://lh6.googleusercontent.com/-GHeImuHqJBE/URqu_FKfVLI/AAAAAAAAAbs/axuEJeqam7Q/s1024/Sailing%252520Stones.jpg",
+            "https://lh3.googleusercontent.com/-hBbYZjTOwGc/URqu_ycpIrI/AAAAAAAAAbs/nAdJUXnGJYE/s1024/Seahorse.jpg",
+            "https://lh3.googleusercontent.com/-Iwi6-i6IexY/URqvAYZHsVI/AAAAAAAAAbs/5ETWl4qXsFE/s1024/Shinjuku%252520Street.jpg",
+            "https://lh6.googleusercontent.com/-amhnySTM_MY/URqvAlb5KoI/AAAAAAAAAbs/pFCFgzlKsn0/s1024/Sierra%252520Heavens.jpg",
+            "https://lh5.googleusercontent.com/-dJgjepFrYSo/URqvBVJZrAI/AAAAAAAAAbs/v-F5QWpYO6s/s1024/Sierra%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-Z4zGiC5nWdc/URqvBdEwivI/AAAAAAAAAbs/ZRZR1VJ84QA/s1024/Sin%252520Lights.jpg",
+            "https://lh4.googleusercontent.com/-_0cYiWW8ccY/URqvBz3iM4I/AAAAAAAAAbs/9N_Wq8MhLTY/s1024/Starry%252520Lake.jpg",
+            "https://lh3.googleusercontent.com/-A9LMoRyuQUA/URqvCYx_JoI/AAAAAAAAAbs/s7sde1Bz9cI/s1024/Starry%252520Night.jpg",
+            "https://lh3.googleusercontent.com/-KtLJ3k858eY/URqvC_2h_bI/AAAAAAAAAbs/zzEBImwDA_g/s1024/Stream.jpg",
+            "https://lh5.googleusercontent.com/-dFB7Lad6RcA/URqvDUftwWI/AAAAAAAAAbs/BrhoUtXTN7o/s1024/Strip%252520Sunset.jpg",
+            "https://lh5.googleusercontent.com/-at6apgFiN20/URqvDyffUZI/AAAAAAAAAbs/clABCx171bE/s1024/Sunset%252520Hills.jpg",
+            "https://lh4.googleusercontent.com/-7-EHhtQthII/URqvEYTk4vI/AAAAAAAAAbs/QSJZoB3YjVg/s1024/Tenaya%252520Lake%2525202.jpg",
+            "https://lh6.googleusercontent.com/-8MrjV_a-Pok/URqvFC5repI/AAAAAAAAAbs/9inKTg9fbCE/s1024/Tenaya%252520Lake.jpg",
+            "https://lh5.googleusercontent.com/-B1HW-z4zwao/URqvFWYRwUI/AAAAAAAAAbs/8Peli53Bs8I/s1024/The%252520Cave%252520BW.jpg",
+            "https://lh3.googleusercontent.com/-PO4E-xZKAnQ/URqvGRqjYkI/AAAAAAAAAbs/42nyADFsXag/s1024/The%252520Fisherman.jpg",
+            "https://lh4.googleusercontent.com/-iLyZlzfdy7s/URqvG0YScdI/AAAAAAAAAbs/1J9eDKmkXtk/s1024/The%252520Night%252520is%252520Coming.jpg",
+            "https://lh6.googleusercontent.com/-G-k7YkkUco0/URqvHhah6fI/AAAAAAAAAbs/_taQQG7t0vo/s1024/The%252520Road.jpg",
+            "https://lh6.googleusercontent.com/-h-ALJt7kSus/URqvIThqYfI/AAAAAAAAAbs/ejiv35olWS8/s1024/Tokyo%252520Heights.jpg",
+            "https://lh5.googleusercontent.com/-Hy9k-TbS7xg/URqvIjQMOxI/AAAAAAAAAbs/RSpmmOATSkg/s1024/Tokyo%252520Highway.jpg",
+            "https://lh6.googleusercontent.com/-83oOvMb4OZs/URqvJL0T7lI/AAAAAAAAAbs/c5TECZ6RONM/s1024/Tokyo%252520Smog.jpg",
+            "https://lh3.googleusercontent.com/-FB-jfgREEfI/URqvJI3EXAI/AAAAAAAAAbs/XfyweiRF4v8/s1024/Tufa%252520at%252520Night.jpg",
+            "https://lh4.googleusercontent.com/-vngKD5Z1U8w/URqvJUCEgPI/AAAAAAAAAbs/ulxCMVcU6EU/s1024/Valley%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-DOz5I2E2oMQ/URqvKMND1kI/AAAAAAAAAbs/Iqf0IsInleo/s1024/Windmill%252520Sunrise.jpg",
+            "https://lh5.googleusercontent.com/-biyiyWcJ9MU/URqvKculiAI/AAAAAAAAAbs/jyPsCplJOpE/s1024/Windmill.jpg",
+            "https://lh4.googleusercontent.com/-PDT167_xRdA/URqvK36mLcI/AAAAAAAAAbs/oi2ik9QseMI/s1024/Windmills.jpg",
+            "https://lh5.googleusercontent.com/-kI_QdYx7VlU/URqvLXCB6gI/AAAAAAAAAbs/N31vlZ6u89o/s1024/Yet%252520Another%252520Rockaway%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-e9NHZ5k5MSs/URqvMIBZjtI/AAAAAAAAAbs/1fV810rDNfQ/s1024/Yosemite%252520Tree.jpg",
+    };
+
+    /**
+     * This are PicasaWeb thumbnail URLs and could potentially change. Ideally the PicasaWeb API
+     * should be used to fetch the URLs.
+     *
+     * Credit to Romain Guy for the photos:
+     * http://www.curious-creature.org/
+     * https://plus.google.com/109538161516040592207/about
+     * http://www.flickr.com/photos/romainguy
+     */
+    public final static String[] imageThumbUrls = new String[] {
+            "https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s240-c/A%252520Photographer.jpg",
+            "https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s240-c/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg",
+            "https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s240-c/Another%252520Rockaway%252520Sunset.jpg",
+            "https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s240-c/Antelope%252520Butte.jpg",
+            "https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s240-c/Antelope%252520Hallway.jpg",
+            "https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s240-c/Antelope%252520Walls.jpg",
+            "https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s240-c/Apre%2525CC%252580s%252520la%252520Pluie.jpg",
+            "https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s240-c/Backlit%252520Cloud.jpg",
+            "https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s240-c/Bee%252520and%252520Flower.jpg",
+            "https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s240-c/Bonzai%252520Rock%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s240-c/Caterpillar.jpg",
+            "https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s240-c/Chess.jpg",
+            "https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s240-c/Chihuly.jpg",
+            "https://lh5.googleusercontent.com/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s240-c/Closed%252520Door.jpg",
+            "https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s240-c/Colorado%252520River%252520Sunset.jpg",
+            "https://lh3.googleusercontent.com/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s240-c/Colors%252520of%252520Autumn.jpg",
+            "https://lh4.googleusercontent.com/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s240-c/Countryside.jpg",
+            "https://lh4.googleusercontent.com/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s240-c/Death%252520Valley%252520-%252520Dunes.jpg",
+            "https://lh6.googleusercontent.com/-ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s240-c/Delicate%252520Arch.jpg",
+            "https://lh5.googleusercontent.com/-Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s240-c/Despair.jpg",
+            "https://lh5.googleusercontent.com/-gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s240-c/Eagle%252520Fall%252520Sunrise.jpg",
+            "https://lh3.googleusercontent.com/-hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s240-c/Electric%252520Storm.jpg",
+            "https://lh5.googleusercontent.com/-PyY_yiyjPTo/URqunUOhHFI/AAAAAAAAAbs/azZoULNuJXc/s240-c/False%252520Kiva.jpg",
+            "https://lh6.googleusercontent.com/-PYvLVdvXywk/URqunwd8hfI/AAAAAAAAAbs/qiMwgkFvf6I/s240-c/Fitzgerald%252520Streaks.jpg",
+            "https://lh4.googleusercontent.com/-KIR_UobIIqY/URquoCZ9SlI/AAAAAAAAAbs/Y4d4q8sXu4c/s240-c/Foggy%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-9lzOk_OWZH0/URquoo4xYoI/AAAAAAAAAbs/AwgzHtNVCwU/s240-c/Frantic.jpg",
+            "https://lh3.googleusercontent.com/-0X3JNaKaz48/URqupH78wpI/AAAAAAAAAbs/lHXxu_zbH8s/s240-c/Golden%252520Gate%252520Afternoon.jpg",
+            "https://lh6.googleusercontent.com/-95sb5ag7ABc/URqupl95RDI/AAAAAAAAAbs/g73R20iVTRA/s240-c/Golden%252520Gate%252520Fog.jpg",
+            "https://lh3.googleusercontent.com/-JB9v6rtgHhk/URqup21F-zI/AAAAAAAAAbs/64Fb8qMZWXk/s240-c/Golden%252520Grass.jpg",
+            "https://lh4.googleusercontent.com/-EIBGfnuLtII/URquqVHwaRI/AAAAAAAAAbs/FA4McV2u8VE/s240-c/Grand%252520Teton.jpg",
+            "https://lh4.googleusercontent.com/-WoMxZvmN9nY/URquq1v2AoI/AAAAAAAAAbs/grj5uMhL6NA/s240-c/Grass%252520Closeup.jpg",
+            "https://lh3.googleusercontent.com/-6hZiEHXx64Q/URqurxvNdqI/AAAAAAAAAbs/kWMXM3o5OVI/s240-c/Green%252520Grass.jpg",
+            "https://lh5.googleusercontent.com/-6LVb9OXtQ60/URquteBFuKI/AAAAAAAAAbs/4F4kRgecwFs/s240-c/Hanging%252520Leaf.jpg",
+            "https://lh4.googleusercontent.com/-zAvf__52ONk/URqutT_IuxI/AAAAAAAAAbs/D_bcuc0thoU/s240-c/Highway%2525201.jpg",
+            "https://lh6.googleusercontent.com/-H4SrUg615rA/URquuL27fXI/AAAAAAAAAbs/4aEqJfiMsOU/s240-c/Horseshoe%252520Bend%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-JhFi4fb_Pqw/URquuX-QXbI/AAAAAAAAAbs/IXpYUxuweYM/s240-c/Horseshoe%252520Bend.jpg",
+            "https://lh5.googleusercontent.com/-UGgssvFRJ7g/URquueyJzGI/AAAAAAAAAbs/yYIBlLT0toM/s240-c/Into%252520the%252520Blue.jpg",
+            "https://lh3.googleusercontent.com/-CH7KoupI7uI/URquu0FF__I/AAAAAAAAAbs/R7GDmI7v_G0/s240-c/Jelly%252520Fish%2525202.jpg",
+            "https://lh4.googleusercontent.com/-pwuuw6yhg8U/URquvPxR3FI/AAAAAAAAAbs/VNGk6f-tsGE/s240-c/Jelly%252520Fish%2525203.jpg",
+            "https://lh5.googleusercontent.com/-GoUQVw1fnFw/URquv6xbC0I/AAAAAAAAAbs/zEUVTQQ43Zc/s240-c/Kauai.jpg",
+            "https://lh6.googleusercontent.com/-8QdYYQEpYjw/URquwvdh88I/AAAAAAAAAbs/cktDy-ysfHo/s240-c/Kyoto%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-vPeekyDjOE0/URquwzJ28qI/AAAAAAAAAbs/qxcyXULsZrg/s240-c/Lake%252520Tahoe%252520Colors.jpg",
+            "https://lh4.googleusercontent.com/-xBPxWpD4yxU/URquxWHk8AI/AAAAAAAAAbs/ARDPeDYPiMY/s240-c/Lava%252520from%252520the%252520Sky.jpg",
+            "https://lh3.googleusercontent.com/-897VXrJB6RE/URquxxxd-5I/AAAAAAAAAbs/j-Cz4T4YvIw/s240-c/Leica%25252050mm%252520Summilux.jpg",
+            "https://lh5.googleusercontent.com/-qSJ4D4iXzGo/URquyDWiJ1I/AAAAAAAAAbs/k2pBXeWehOA/s240-c/Leica%25252050mm%252520Summilux.jpg",
+            "https://lh6.googleusercontent.com/-dwlPg83vzLg/URquylTVuFI/AAAAAAAAAbs/G6SyQ8b4YsI/s240-c/Leica%252520M8%252520%252528Front%252529.jpg",
+            "https://lh3.googleusercontent.com/-R3_EYAyJvfk/URquzQBv8eI/AAAAAAAAAbs/b9xhpUM3pEI/s240-c/Light%252520to%252520Sand.jpg",
+            "https://lh3.googleusercontent.com/-fHY5h67QPi0/URqu0Cp4J1I/AAAAAAAAAbs/0lG6m94Z6vM/s240-c/Little%252520Bit%252520of%252520Paradise.jpg",
+            "https://lh5.googleusercontent.com/-TzF_LwrCnRM/URqu0RddPOI/AAAAAAAAAbs/gaj2dLiuX0s/s240-c/Lone%252520Pine%252520Sunset.jpg",
+            "https://lh3.googleusercontent.com/-4HdpJ4_DXU4/URqu046dJ9I/AAAAAAAAAbs/eBOodtk2_uk/s240-c/Lonely%252520Rock.jpg",
+            "https://lh6.googleusercontent.com/-erbF--z-W4s/URqu1ajSLkI/AAAAAAAAAbs/xjDCDO1INzM/s240-c/Longue%252520Vue.jpg",
+            "https://lh6.googleusercontent.com/-0CXJRdJaqvc/URqu1opNZNI/AAAAAAAAAbs/PFB2oPUU7Lk/s240-c/Look%252520Me%252520in%252520the%252520Eye.jpg",
+            "https://lh3.googleusercontent.com/-D_5lNxnDN6g/URqu2Tk7HVI/AAAAAAAAAbs/p0ddca9W__Y/s240-c/Lost%252520in%252520a%252520Field.jpg",
+            "https://lh6.googleusercontent.com/-flsqwMrIk2Q/URqu24PcmjI/AAAAAAAAAbs/5ocIH85XofM/s240-c/Marshall%252520Beach%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-Y4lgryEVTmU/URqu28kG3gI/AAAAAAAAAbs/OjXpekqtbJ4/s240-c/Mono%252520Lake%252520Blue.jpg",
+            "https://lh4.googleusercontent.com/-AaHAJPmcGYA/URqu3PIldHI/AAAAAAAAAbs/lcTqk1SIcRs/s240-c/Monument%252520Valley%252520Overlook.jpg",
+            "https://lh4.googleusercontent.com/-vKxfdQ83dQA/URqu31Yq_BI/AAAAAAAAAbs/OUoGk_2AyfM/s240-c/Moving%252520Rock.jpg",
+            "https://lh5.googleusercontent.com/-CG62QiPpWXg/URqu4ia4vRI/AAAAAAAAAbs/0YOdqLAlcAc/s240-c/Napali%252520Coast.jpg",
+            "https://lh6.googleusercontent.com/-wdGrP5PMmJQ/URqu5PZvn7I/AAAAAAAAAbs/m0abEcdPXe4/s240-c/One%252520Wheel.jpg",
+            "https://lh6.googleusercontent.com/-6WS5DoCGuOA/URqu5qx1UgI/AAAAAAAAAbs/giMw2ixPvrY/s240-c/Open%252520Sky.jpg",
+            "https://lh6.googleusercontent.com/-u8EHKj8G8GQ/URqu55sM6yI/AAAAAAAAAbs/lIXX_GlTdmI/s240-c/Orange%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-74Z5qj4bTDE/URqu6LSrJrI/AAAAAAAAAbs/XzmVkw90szQ/s240-c/Orchid.jpg",
+            "https://lh6.googleusercontent.com/-lEQE4h6TePE/URqu6t_lSkI/AAAAAAAAAbs/zvGYKOea_qY/s240-c/Over%252520there.jpg",
+            "https://lh5.googleusercontent.com/-cauH-53JH2M/URqu66v_USI/AAAAAAAAAbs/EucwwqclfKQ/s240-c/Plumes.jpg",
+            "https://lh3.googleusercontent.com/-eDLT2jHDoy4/URqu7axzkAI/AAAAAAAAAbs/iVZE-xJ7lZs/s240-c/Rainbokeh.jpg",
+            "https://lh5.googleusercontent.com/-j1NLqEFIyco/URqu8L1CGcI/AAAAAAAAAbs/aqZkgX66zlI/s240-c/Rainbow.jpg",
+            "https://lh5.googleusercontent.com/-DRnqmK0t4VU/URqu8XYN9yI/AAAAAAAAAbs/LgvF_592WLU/s240-c/Rice%252520Fields.jpg",
+            "https://lh3.googleusercontent.com/-hwh1v3EOGcQ/URqu8qOaKwI/AAAAAAAAAbs/IljRJRnbJGw/s240-c/Rockaway%252520Fire%252520Sky.jpg",
+            "https://lh5.googleusercontent.com/-wjV6FQk7tlk/URqu9jCQ8sI/AAAAAAAAAbs/RyYUpdo-c9o/s240-c/Rockaway%252520Flow.jpg",
+            "https://lh6.googleusercontent.com/-6cAXNfo7D20/URqu-BdzgPI/AAAAAAAAAbs/OmsYllzJqwo/s240-c/Rockaway%252520Sunset%252520Sky.jpg",
+            "https://lh3.googleusercontent.com/-sl8fpGPS-RE/URqu_BOkfgI/AAAAAAAAAbs/Dg2Fv-JxOeg/s240-c/Russian%252520Ridge%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-gVtY36mMBIg/URqu_q91lkI/AAAAAAAAAbs/3CiFMBcy5MA/s240-c/Rust%252520Knot.jpg",
+            "https://lh6.googleusercontent.com/-GHeImuHqJBE/URqu_FKfVLI/AAAAAAAAAbs/axuEJeqam7Q/s240-c/Sailing%252520Stones.jpg",
+            "https://lh3.googleusercontent.com/-hBbYZjTOwGc/URqu_ycpIrI/AAAAAAAAAbs/nAdJUXnGJYE/s240-c/Seahorse.jpg",
+            "https://lh3.googleusercontent.com/-Iwi6-i6IexY/URqvAYZHsVI/AAAAAAAAAbs/5ETWl4qXsFE/s240-c/Shinjuku%252520Street.jpg",
+            "https://lh6.googleusercontent.com/-amhnySTM_MY/URqvAlb5KoI/AAAAAAAAAbs/pFCFgzlKsn0/s240-c/Sierra%252520Heavens.jpg",
+            "https://lh5.googleusercontent.com/-dJgjepFrYSo/URqvBVJZrAI/AAAAAAAAAbs/v-F5QWpYO6s/s240-c/Sierra%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-Z4zGiC5nWdc/URqvBdEwivI/AAAAAAAAAbs/ZRZR1VJ84QA/s240-c/Sin%252520Lights.jpg",
+            "https://lh4.googleusercontent.com/-_0cYiWW8ccY/URqvBz3iM4I/AAAAAAAAAbs/9N_Wq8MhLTY/s240-c/Starry%252520Lake.jpg",
+            "https://lh3.googleusercontent.com/-A9LMoRyuQUA/URqvCYx_JoI/AAAAAAAAAbs/s7sde1Bz9cI/s240-c/Starry%252520Night.jpg",
+            "https://lh3.googleusercontent.com/-KtLJ3k858eY/URqvC_2h_bI/AAAAAAAAAbs/zzEBImwDA_g/s240-c/Stream.jpg",
+            "https://lh5.googleusercontent.com/-dFB7Lad6RcA/URqvDUftwWI/AAAAAAAAAbs/BrhoUtXTN7o/s240-c/Strip%252520Sunset.jpg",
+            "https://lh5.googleusercontent.com/-at6apgFiN20/URqvDyffUZI/AAAAAAAAAbs/clABCx171bE/s240-c/Sunset%252520Hills.jpg",
+            "https://lh4.googleusercontent.com/-7-EHhtQthII/URqvEYTk4vI/AAAAAAAAAbs/QSJZoB3YjVg/s240-c/Tenaya%252520Lake%2525202.jpg",
+            "https://lh6.googleusercontent.com/-8MrjV_a-Pok/URqvFC5repI/AAAAAAAAAbs/9inKTg9fbCE/s240-c/Tenaya%252520Lake.jpg",
+            "https://lh5.googleusercontent.com/-B1HW-z4zwao/URqvFWYRwUI/AAAAAAAAAbs/8Peli53Bs8I/s240-c/The%252520Cave%252520BW.jpg",
+            "https://lh3.googleusercontent.com/-PO4E-xZKAnQ/URqvGRqjYkI/AAAAAAAAAbs/42nyADFsXag/s240-c/The%252520Fisherman.jpg",
+            "https://lh4.googleusercontent.com/-iLyZlzfdy7s/URqvG0YScdI/AAAAAAAAAbs/1J9eDKmkXtk/s240-c/The%252520Night%252520is%252520Coming.jpg",
+            "https://lh6.googleusercontent.com/-G-k7YkkUco0/URqvHhah6fI/AAAAAAAAAbs/_taQQG7t0vo/s240-c/The%252520Road.jpg",
+            "https://lh6.googleusercontent.com/-h-ALJt7kSus/URqvIThqYfI/AAAAAAAAAbs/ejiv35olWS8/s240-c/Tokyo%252520Heights.jpg",
+            "https://lh5.googleusercontent.com/-Hy9k-TbS7xg/URqvIjQMOxI/AAAAAAAAAbs/RSpmmOATSkg/s240-c/Tokyo%252520Highway.jpg",
+            "https://lh6.googleusercontent.com/-83oOvMb4OZs/URqvJL0T7lI/AAAAAAAAAbs/c5TECZ6RONM/s240-c/Tokyo%252520Smog.jpg",
+            "https://lh3.googleusercontent.com/-FB-jfgREEfI/URqvJI3EXAI/AAAAAAAAAbs/XfyweiRF4v8/s240-c/Tufa%252520at%252520Night.jpg",
+            "https://lh4.googleusercontent.com/-vngKD5Z1U8w/URqvJUCEgPI/AAAAAAAAAbs/ulxCMVcU6EU/s240-c/Valley%252520Sunset.jpg",
+            "https://lh6.googleusercontent.com/-DOz5I2E2oMQ/URqvKMND1kI/AAAAAAAAAbs/Iqf0IsInleo/s240-c/Windmill%252520Sunrise.jpg",
+            "https://lh5.googleusercontent.com/-biyiyWcJ9MU/URqvKculiAI/AAAAAAAAAbs/jyPsCplJOpE/s240-c/Windmill.jpg",
+            "https://lh4.googleusercontent.com/-PDT167_xRdA/URqvK36mLcI/AAAAAAAAAbs/oi2ik9QseMI/s240-c/Windmills.jpg",
+            "https://lh5.googleusercontent.com/-kI_QdYx7VlU/URqvLXCB6gI/AAAAAAAAAbs/N31vlZ6u89o/s240-c/Yet%252520Another%252520Rockaway%252520Sunset.jpg",
+            "https://lh4.googleusercontent.com/-e9NHZ5k5MSs/URqvMIBZjtI/AAAAAAAAAbs/1fV810rDNfQ/s240-c/Yosemite%252520Tree.jpg",
+    };
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageDetailActivity.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageDetailActivity.java
new file mode 100644
index 0000000..c2be1ac
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageDetailActivity.java
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.ui;
+
+import android.annotation.TargetApi;
+import android.app.ActionBar;
+import android.os.Build.VERSION_CODES;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.app.NavUtils;
+import android.support.v4.view.ViewPager;
+import android.util.DisplayMetrics;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.WindowManager.LayoutParams;
+import android.widget.Toast;
+
+import com.example.android.displayingbitmaps.BuildConfig;
+import com.example.android.displayingbitmaps.R;
+import com.example.android.displayingbitmaps.provider.Images;
+import com.example.android.displayingbitmaps.util.ImageCache;
+import com.example.android.displayingbitmaps.util.ImageFetcher;
+import com.example.android.displayingbitmaps.util.Utils;
+
+public class ImageDetailActivity extends FragmentActivity implements OnClickListener {
+    private static final String IMAGE_CACHE_DIR = "images";
+    public static final String EXTRA_IMAGE = "extra_image";
+
+    private ImagePagerAdapter mAdapter;
+    private ImageFetcher mImageFetcher;
+    private ViewPager mPager;
+
+    @TargetApi(VERSION_CODES.HONEYCOMB)
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        if (BuildConfig.DEBUG) {
+            Utils.enableStrictMode();
+        }
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.image_detail_pager);
+
+        // Fetch screen height and width, to use as our max size when loading images as this
+        // activity runs full screen
+        final DisplayMetrics displayMetrics = new DisplayMetrics();
+        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
+        final int height = displayMetrics.heightPixels;
+        final int width = displayMetrics.widthPixels;
+
+        // For this sample we'll use half of the longest width to resize our images. As the
+        // image scaling ensures the image is larger than this, we should be left with a
+        // resolution that is appropriate for both portrait and landscape. For best image quality
+        // we shouldn't divide by 2, but this will use more memory and require a larger memory
+        // cache.
+        final int longest = (height > width ? height : width) / 2;
+
+        ImageCache.ImageCacheParams cacheParams =
+                new ImageCache.ImageCacheParams(this, IMAGE_CACHE_DIR);
+        cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memory
+
+        // The ImageFetcher takes care of loading images into our ImageView children asynchronously
+        mImageFetcher = new ImageFetcher(this, longest);
+        mImageFetcher.addImageCache(getSupportFragmentManager(), cacheParams);
+        mImageFetcher.setImageFadeIn(false);
+
+        // Set up ViewPager and backing adapter
+        mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), Images.imageUrls.length);
+        mPager = (ViewPager) findViewById(R.id.pager);
+        mPager.setAdapter(mAdapter);
+        mPager.setPageMargin((int) getResources().getDimension(R.dimen.horizontal_page_margin));
+        mPager.setOffscreenPageLimit(2);
+
+        // Set up activity to go full screen
+        getWindow().addFlags(LayoutParams.FLAG_FULLSCREEN);
+
+        // Enable some additional newer visibility and ActionBar features to create a more
+        // immersive photo viewing experience
+        if (Utils.hasHoneycomb()) {
+            final ActionBar actionBar = getActionBar();
+
+            // Hide title text and set home as up
+            actionBar.setDisplayShowTitleEnabled(false);
+            actionBar.setDisplayHomeAsUpEnabled(true);
+
+            // Hide and show the ActionBar as the visibility changes
+            mPager.setOnSystemUiVisibilityChangeListener(
+                    new View.OnSystemUiVisibilityChangeListener() {
+                        @Override
+                        public void onSystemUiVisibilityChange(int vis) {
+                            if ((vis & View.SYSTEM_UI_FLAG_LOW_PROFILE) != 0) {
+                                actionBar.hide();
+                            } else {
+                                actionBar.show();
+                            }
+                        }
+                    });
+
+            // Start low profile mode and hide ActionBar
+            mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
+            actionBar.hide();
+        }
+
+        // Set the current item based on the extra passed in to this activity
+        final int extraCurrentItem = getIntent().getIntExtra(EXTRA_IMAGE, -1);
+        if (extraCurrentItem != -1) {
+            mPager.setCurrentItem(extraCurrentItem);
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mImageFetcher.setExitTasksEarly(false);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        mImageFetcher.setExitTasksEarly(true);
+        mImageFetcher.flushCache();
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        mImageFetcher.closeCache();
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                NavUtils.navigateUpFromSameTask(this);
+                return true;
+            case R.id.clear_cache:
+                mImageFetcher.clearCache();
+                Toast.makeText(
+                        this, R.string.clear_cache_complete_toast,Toast.LENGTH_SHORT).show();
+                return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.main_menu, menu);
+        return true;
+    }
+
+    /**
+     * Called by the ViewPager child fragments to load images via the one ImageFetcher
+     */
+    public ImageFetcher getImageFetcher() {
+        return mImageFetcher;
+    }
+
+    /**
+     * The main adapter that backs the ViewPager. A subclass of FragmentStatePagerAdapter as there
+     * could be a large number of items in the ViewPager and we don't want to retain them all in
+     * memory at once but create/destroy them on the fly.
+     */
+    private class ImagePagerAdapter extends FragmentStatePagerAdapter {
+        private final int mSize;
+
+        public ImagePagerAdapter(FragmentManager fm, int size) {
+            super(fm);
+            mSize = size;
+        }
+
+        @Override
+        public int getCount() {
+            return mSize;
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            return ImageDetailFragment.newInstance(Images.imageUrls[position]);
+        }
+    }
+
+    /**
+     * Set on the ImageView in the ViewPager children fragments, to enable/disable low profile mode
+     * when the ImageView is touched.
+     */
+    @TargetApi(VERSION_CODES.HONEYCOMB)
+    @Override
+    public void onClick(View v) {
+        final int vis = mPager.getSystemUiVisibility();
+        if ((vis & View.SYSTEM_UI_FLAG_LOW_PROFILE) != 0) {
+            mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
+        } else {
+            mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
+        }
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageDetailFragment.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageDetailFragment.java
new file mode 100644
index 0000000..506729a
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageDetailFragment.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.ui;
+
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+
+import com.example.android.displayingbitmaps.R;
+import com.example.android.displayingbitmaps.util.ImageFetcher;
+import com.example.android.displayingbitmaps.util.ImageWorker;
+import com.example.android.displayingbitmaps.util.Utils;
+
+/**
+ * This fragment will populate the children of the ViewPager from {@link ImageDetailActivity}.
+ */
+public class ImageDetailFragment extends Fragment {
+    private static final String IMAGE_DATA_EXTRA = "extra_image_data";
+    private String mImageUrl;
+    private ImageView mImageView;
+    private ImageFetcher mImageFetcher;
+
+    /**
+     * Factory method to generate a new instance of the fragment given an image number.
+     *
+     * @param imageUrl The image url to load
+     * @return A new instance of ImageDetailFragment with imageNum extras
+     */
+    public static ImageDetailFragment newInstance(String imageUrl) {
+        final ImageDetailFragment f = new ImageDetailFragment();
+
+        final Bundle args = new Bundle();
+        args.putString(IMAGE_DATA_EXTRA, imageUrl);
+        f.setArguments(args);
+
+        return f;
+    }
+
+    /**
+     * Empty constructor as per the Fragment documentation
+     */
+    public ImageDetailFragment() {}
+
+    /**
+     * Populate image using a url from extras, use the convenience factory method
+     * {@link ImageDetailFragment#newInstance(String)} to create this fragment.
+     */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        // Inflate and locate the main ImageView
+        final View v = inflater.inflate(R.layout.image_detail_fragment, container, false);
+        mImageView = (ImageView) v.findViewById(R.id.imageView);
+        return v;
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        // Use the parent activity to load the image asynchronously into the ImageView (so a single
+        // cache can be used over all pages in the ViewPager
+        if (ImageDetailActivity.class.isInstance(getActivity())) {
+            mImageFetcher = ((ImageDetailActivity) getActivity()).getImageFetcher();
+            mImageFetcher.loadImage(mImageUrl, mImageView);
+        }
+
+        // Pass clicks on the ImageView to the parent activity to handle
+        if (OnClickListener.class.isInstance(getActivity()) && Utils.hasHoneycomb()) {
+            mImageView.setOnClickListener((OnClickListener) getActivity());
+        }
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        if (mImageView != null) {
+            // Cancel any pending image work
+            ImageWorker.cancelWork(mImageView);
+            mImageView.setImageDrawable(null);
+        }
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageGridActivity.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageGridActivity.java
new file mode 100644
index 0000000..f171955
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageGridActivity.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.ui;
+
+import android.os.Bundle;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.FragmentTransaction;
+
+import com.example.android.displayingbitmaps.BuildConfig;
+import com.example.android.displayingbitmaps.util.Utils;
+
+/**
+ * Simple FragmentActivity to hold the main {@link ImageGridFragment} and not much else.
+ */
+public class ImageGridActivity extends FragmentActivity {
+    private static final String TAG = "ImageGridActivity";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        if (BuildConfig.DEBUG) {
+            Utils.enableStrictMode();
+        }
+        super.onCreate(savedInstanceState);
+
+        if (getSupportFragmentManager().findFragmentByTag(TAG) == null) {
+            final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
+            ft.add(android.R.id.content, new ImageGridFragment(), TAG);
+            ft.commit();
+        }
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageGridFragment.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageGridFragment.java
new file mode 100644
index 0000000..4eb1f1b
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/ImageGridFragment.java
@@ -0,0 +1,336 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.ui;
+
+import android.annotation.TargetApi;
+import android.app.ActivityOptions;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build.VERSION_CODES;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.util.TypedValue;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewGroup.LayoutParams;
+import android.view.ViewTreeObserver;
+import android.widget.AbsListView;
+import android.widget.AdapterView;
+import android.widget.BaseAdapter;
+import android.widget.GridView;
+import android.widget.ImageView;
+import android.widget.Toast;
+
+import com.example.android.common.logger.Log;
+import com.example.android.displayingbitmaps.BuildConfig;
+import com.example.android.displayingbitmaps.R;
+import com.example.android.displayingbitmaps.provider.Images;
+import com.example.android.displayingbitmaps.util.ImageCache;
+import com.example.android.displayingbitmaps.util.ImageFetcher;
+import com.example.android.displayingbitmaps.util.Utils;
+
+/**
+ * The main fragment that powers the ImageGridActivity screen. Fairly straight forward GridView
+ * implementation with the key addition being the ImageWorker class w/ImageCache to load children
+ * asynchronously, keeping the UI nice and smooth and caching thumbnails for quick retrieval. The
+ * cache is retained over configuration changes like orientation change so the images are populated
+ * quickly if, for example, the user rotates the device.
+ */
+public class ImageGridFragment extends Fragment implements AdapterView.OnItemClickListener {
+    private static final String TAG = "ImageGridFragment";
+    private static final String IMAGE_CACHE_DIR = "thumbs";
+
+    private int mImageThumbSize;
+    private int mImageThumbSpacing;
+    private ImageAdapter mAdapter;
+    private ImageFetcher mImageFetcher;
+
+    /**
+     * Empty constructor as per the Fragment documentation
+     */
+    public ImageGridFragment() {}
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+
+        mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size);
+        mImageThumbSpacing = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_spacing);
+
+        mAdapter = new ImageAdapter(getActivity());
+
+        ImageCache.ImageCacheParams cacheParams =
+                new ImageCache.ImageCacheParams(getActivity(), IMAGE_CACHE_DIR);
+
+        cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memory
+
+        // The ImageFetcher takes care of loading images into our ImageView children asynchronously
+        mImageFetcher = new ImageFetcher(getActivity(), mImageThumbSize);
+        mImageFetcher.setLoadingImage(R.drawable.empty_photo);
+        mImageFetcher.addImageCache(getActivity().getSupportFragmentManager(), cacheParams);
+    }
+
+    @Override
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+
+        final View v = inflater.inflate(R.layout.image_grid_fragment, container, false);
+        final GridView mGridView = (GridView) v.findViewById(R.id.gridView);
+        mGridView.setAdapter(mAdapter);
+        mGridView.setOnItemClickListener(this);
+        mGridView.setOnScrollListener(new AbsListView.OnScrollListener() {
+            @Override
+            public void onScrollStateChanged(AbsListView absListView, int scrollState) {
+                // Pause fetcher to ensure smoother scrolling when flinging
+                if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) {
+                    // Before Honeycomb pause image loading on scroll to help with performance
+                    if (!Utils.hasHoneycomb()) {
+                        mImageFetcher.setPauseWork(true);
+                    }
+                } else {
+                    mImageFetcher.setPauseWork(false);
+                }
+            }
+
+            @Override
+            public void onScroll(AbsListView absListView, int firstVisibleItem,
+                    int visibleItemCount, int totalItemCount) {
+            }
+        });
+
+        // This listener is used to get the final width of the GridView and then calculate the
+        // number of columns and the width of each column. The width of each column is variable
+        // as the GridView has stretchMode=columnWidth. The column width is used to set the height
+        // of each view so we get nice square thumbnails.
+        mGridView.getViewTreeObserver().addOnGlobalLayoutListener(
+                new ViewTreeObserver.OnGlobalLayoutListener() {
+                    @TargetApi(VERSION_CODES.JELLY_BEAN)
+                    @Override
+                    public void onGlobalLayout() {
+                        if (mAdapter.getNumColumns() == 0) {
+                            final int numColumns = (int) Math.floor(
+                                    mGridView.getWidth() / (mImageThumbSize + mImageThumbSpacing));
+                            if (numColumns > 0) {
+                                final int columnWidth =
+                                        (mGridView.getWidth() / numColumns) - mImageThumbSpacing;
+                                mAdapter.setNumColumns(numColumns);
+                                mAdapter.setItemHeight(columnWidth);
+                                if (BuildConfig.DEBUG) {
+                                    Log.d(TAG, "onCreateView - numColumns set to " + numColumns);
+                                }
+                                if (Utils.hasJellyBean()) {
+                                    mGridView.getViewTreeObserver()
+                                            .removeOnGlobalLayoutListener(this);
+                                } else {
+                                    mGridView.getViewTreeObserver()
+                                            .removeGlobalOnLayoutListener(this);
+                                }
+                            }
+                        }
+                    }
+                });
+
+        return v;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mImageFetcher.setExitTasksEarly(false);
+        mAdapter.notifyDataSetChanged();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mImageFetcher.setPauseWork(false);
+        mImageFetcher.setExitTasksEarly(true);
+        mImageFetcher.flushCache();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        mImageFetcher.closeCache();
+    }
+
+    @TargetApi(VERSION_CODES.JELLY_BEAN)
+    @Override
+    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
+        final Intent i = new Intent(getActivity(), ImageDetailActivity.class);
+        i.putExtra(ImageDetailActivity.EXTRA_IMAGE, (int) id);
+        if (Utils.hasJellyBean()) {
+            // makeThumbnailScaleUpAnimation() looks kind of ugly here as the loading spinner may
+            // show plus the thumbnail image in GridView is cropped. so using
+            // makeScaleUpAnimation() instead.
+            ActivityOptions options =
+                    ActivityOptions.makeScaleUpAnimation(v, 0, 0, v.getWidth(), v.getHeight());
+            getActivity().startActivity(i, options.toBundle());
+        } else {
+            startActivity(i);
+        }
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.main_menu, menu);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.clear_cache:
+                mImageFetcher.clearCache();
+                Toast.makeText(getActivity(), R.string.clear_cache_complete_toast,
+                        Toast.LENGTH_SHORT).show();
+                return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    /**
+     * The main adapter that backs the GridView. This is fairly standard except the number of
+     * columns in the GridView is used to create a fake top row of empty views as we use a
+     * transparent ActionBar and don't want the real top row of images to start off covered by it.
+     */
+    private class ImageAdapter extends BaseAdapter {
+
+        private final Context mContext;
+        private int mItemHeight = 0;
+        private int mNumColumns = 0;
+        private int mActionBarHeight = 0;
+        private GridView.LayoutParams mImageViewLayoutParams;
+
+        public ImageAdapter(Context context) {
+            super();
+            mContext = context;
+            mImageViewLayoutParams = new GridView.LayoutParams(
+                    LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
+            // Calculate ActionBar height
+            TypedValue tv = new TypedValue();
+            if (context.getTheme().resolveAttribute(
+                    android.R.attr.actionBarSize, tv, true)) {
+                mActionBarHeight = TypedValue.complexToDimensionPixelSize(
+                        tv.data, context.getResources().getDisplayMetrics());
+            }
+        }
+
+        @Override
+        public int getCount() {
+            // If columns have yet to be determined, return no items
+            if (getNumColumns() == 0) {
+                return 0;
+            }
+
+            // Size + number of columns for top empty row
+            return Images.imageThumbUrls.length + mNumColumns;
+        }
+
+        @Override
+        public Object getItem(int position) {
+            return position < mNumColumns ?
+                    null : Images.imageThumbUrls[position - mNumColumns];
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position < mNumColumns ? 0 : position - mNumColumns;
+        }
+
+        @Override
+        public int getViewTypeCount() {
+            // Two types of views, the normal ImageView and the top row of empty views
+            return 2;
+        }
+
+        @Override
+        public int getItemViewType(int position) {
+            return (position < mNumColumns) ? 1 : 0;
+        }
+
+        @Override
+        public boolean hasStableIds() {
+            return true;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup container) {
+            //BEGIN_INCLUDE(load_gridview_item)
+            // First check if this is the top row
+            if (position < mNumColumns) {
+                if (convertView == null) {
+                    convertView = new View(mContext);
+                }
+                // Set empty view with height of ActionBar
+                convertView.setLayoutParams(new AbsListView.LayoutParams(
+                        LayoutParams.MATCH_PARENT, mActionBarHeight));
+                return convertView;
+            }
+
+            // Now handle the main ImageView thumbnails
+            ImageView imageView;
+            if (convertView == null) { // if it's not recycled, instantiate and initialize
+                imageView = new RecyclingImageView(mContext);
+                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
+                imageView.setLayoutParams(mImageViewLayoutParams);
+            } else { // Otherwise re-use the converted view
+                imageView = (ImageView) convertView;
+            }
+
+            // Check the height matches our calculated column width
+            if (imageView.getLayoutParams().height != mItemHeight) {
+                imageView.setLayoutParams(mImageViewLayoutParams);
+            }
+
+            // Finally load the image asynchronously into the ImageView, this also takes care of
+            // setting a placeholder image while the background thread runs
+            mImageFetcher.loadImage(Images.imageThumbUrls[position - mNumColumns], imageView);
+            return imageView;
+            //END_INCLUDE(load_gridview_item)
+        }
+
+        /**
+         * Sets the item height. Useful for when we know the column width so the height can be set
+         * to match.
+         *
+         * @param height
+         */
+        public void setItemHeight(int height) {
+            if (height == mItemHeight) {
+                return;
+            }
+            mItemHeight = height;
+            mImageViewLayoutParams =
+                    new GridView.LayoutParams(LayoutParams.MATCH_PARENT, mItemHeight);
+            mImageFetcher.setImageSize(height);
+            notifyDataSetChanged();
+        }
+
+        public void setNumColumns(int numColumns) {
+            mNumColumns = numColumns;
+        }
+
+        public int getNumColumns() {
+            return mNumColumns;
+        }
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/RecyclingImageView.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/RecyclingImageView.java
new file mode 100644
index 0000000..1db134c
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/ui/RecyclingImageView.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2013 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.example.android.displayingbitmaps.ui;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.LayerDrawable;
+import android.util.AttributeSet;
+import android.widget.ImageView;
+
+import com.example.android.displayingbitmaps.util.RecyclingBitmapDrawable;
+
+/**
+ * Sub-class of ImageView which automatically notifies the drawable when it is
+ * being displayed.
+ */
+public class RecyclingImageView extends ImageView {
+
+    public RecyclingImageView(Context context) {
+        super(context);
+    }
+
+    public RecyclingImageView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    /**
+     * @see android.widget.ImageView#onDetachedFromWindow()
+     */
+    @Override
+    protected void onDetachedFromWindow() {
+        // This has been detached from Window, so clear the drawable
+        setImageDrawable(null);
+
+        super.onDetachedFromWindow();
+    }
+
+    /**
+     * @see android.widget.ImageView#setImageDrawable(android.graphics.drawable.Drawable)
+     */
+    @Override
+    public void setImageDrawable(Drawable drawable) {
+        // Keep hold of previous Drawable
+        final Drawable previousDrawable = getDrawable();
+
+        // Call super to set new Drawable
+        super.setImageDrawable(drawable);
+
+        // Notify new Drawable that it is being displayed
+        notifyDrawable(drawable, true);
+
+        // Notify old Drawable so it is no longer being displayed
+        notifyDrawable(previousDrawable, false);
+    }
+
+    /**
+     * Notifies the drawable that it's displayed state has changed.
+     *
+     * @param drawable
+     * @param isDisplayed
+     */
+    private static void notifyDrawable(Drawable drawable, final boolean isDisplayed) {
+        if (drawable instanceof RecyclingBitmapDrawable) {
+            // The drawable is a CountingBitmapDrawable, so notify it
+            ((RecyclingBitmapDrawable) drawable).setIsDisplayed(isDisplayed);
+        } else if (drawable instanceof LayerDrawable) {
+            // The drawable is a LayerDrawable, so recurse on each layer
+            LayerDrawable layerDrawable = (LayerDrawable) drawable;
+            for (int i = 0, z = layerDrawable.getNumberOfLayers(); i < z; i++) {
+                notifyDrawable(layerDrawable.getDrawable(i), isDisplayed);
+            }
+        }
+    }
+
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/AsyncTask.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/AsyncTask.java
new file mode 100644
index 0000000..dffade4
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/AsyncTask.java
@@ -0,0 +1,693 @@
+/*
+ * Copyright (C) 2008 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.example.android.displayingbitmaps.util;
+
+import android.annotation.TargetApi;
+import android.os.Handler;
+import android.os.Message;
+import android.os.Process;
+
+import java.util.ArrayDeque;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.Callable;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * *************************************
+ * Copied from JB release framework:
+ * https://android.googlesource.com/platform/frameworks/base/+/jb-release/core/java/android/os/AsyncTask.java
+ *
+ * so that threading behavior on all OS versions is the same and we can tweak behavior by using
+ * executeOnExecutor() if needed.
+ *
+ * There are 3 changes in this copy of AsyncTask:
+ *    -pre-HC a single thread executor is used for serial operation
+ *    (Executors.newSingleThreadExecutor) and is the default
+ *    -the default THREAD_POOL_EXECUTOR was changed to use DiscardOldestPolicy
+ *    -a new fixed thread pool called DUAL_THREAD_EXECUTOR was added
+ * *************************************
+ *
+ * <p>AsyncTask enables proper and easy use of the UI thread. This class allows to
+ * perform background operations and publish results on the UI thread without
+ * having to manipulate threads and/or handlers.</p>
+ *
+ * <p>AsyncTask is designed to be a helper class around {@link Thread} and {@link android.os.Handler}
+ * and does not constitute a generic threading framework. AsyncTasks should ideally be
+ * used for short operations (a few seconds at the most.) If you need to keep threads
+ * running for long periods of time, it is highly recommended you use the various APIs
+ * provided by the <code>java.util.concurrent</code> pacakge such as {@link java.util.concurrent.Executor},
+ * {@link java.util.concurrent.ThreadPoolExecutor} and {@link java.util.concurrent.FutureTask}.</p>
+ *
+ * <p>An asynchronous task is defined by a computation that runs on a background thread and
+ * whose result is published on the UI thread. An asynchronous task is defined by 3 generic
+ * types, called <code>Params</code>, <code>Progress</code> and <code>Result</code>,
+ * and 4 steps, called <code>onPreExecute</code>, <code>doInBackground</code>,
+ * <code>onProgressUpdate</code> and <code>onPostExecute</code>.</p>
+ *
+ * <div class="special reference">
+ * <h3>Developer Guides</h3>
+ * <p>For more information about using tasks and threads, read the
+ * <a href="{@docRoot}guide/topics/fundamentals/processes-and-threads.html">Processes and
+ * Threads</a> developer guide.</p>
+ * </div>
+ *
+ * <h2>Usage</h2>
+ * <p>AsyncTask must be subclassed to be used. The subclass will override at least
+ * one method ({@link #doInBackground}), and most often will override a
+ * second one ({@link #onPostExecute}.)</p>
+ *
+ * <p>Here is an example of subclassing:</p>
+ * <pre class="prettyprint">
+ * private class DownloadFilesTask extends AsyncTask&lt;URL, Integer, Long&gt; {
+ *     protected Long doInBackground(URL... urls) {
+ *         int count = urls.length;
+ *         long totalSize = 0;
+ *         for (int i = 0; i < count; i++) {
+ *             totalSize += Downloader.downloadFile(urls[i]);
+ *             publishProgress((int) ((i / (float) count) * 100));
+ *             // Escape early if cancel() is called
+ *             if (isCancelled()) break;
+ *         }
+ *         return totalSize;
+ *     }
+ *
+ *     protected void onProgressUpdate(Integer... progress) {
+ *         setProgressPercent(progress[0]);
+ *     }
+ *
+ *     protected void onPostExecute(Long result) {
+ *         showDialog("Downloaded " + result + " bytes");
+ *     }
+ * }
+ * </pre>
+ *
+ * <p>Once created, a task is executed very simply:</p>
+ * <pre class="prettyprint">
+ * new DownloadFilesTask().execute(url1, url2, url3);
+ * </pre>
+ *
+ * <h2>AsyncTask's generic types</h2>
+ * <p>The three types used by an asynchronous task are the following:</p>
+ * <ol>
+ *     <li><code>Params</code>, the type of the parameters sent to the task upon
+ *     execution.</li>
+ *     <li><code>Progress</code>, the type of the progress units published during
+ *     the background computation.</li>
+ *     <li><code>Result</code>, the type of the result of the background
+ *     computation.</li>
+ * </ol>
+ * <p>Not all types are always used by an asynchronous task. To mark a type as unused,
+ * simply use the type {@link Void}:</p>
+ * <pre>
+ * private class MyTask extends AsyncTask&lt;Void, Void, Void&gt; { ... }
+ * </pre>
+ *
+ * <h2>The 4 steps</h2>
+ * <p>When an asynchronous task is executed, the task goes through 4 steps:</p>
+ * <ol>
+ *     <li>{@link #onPreExecute()}, invoked on the UI thread immediately after the task
+ *     is executed. This step is normally used to setup the task, for instance by
+ *     showing a progress bar in the user interface.</li>
+ *     <li>{@link #doInBackground}, invoked on the background thread
+ *     immediately after {@link #onPreExecute()} finishes executing. This step is used
+ *     to perform background computation that can take a long time. The parameters
+ *     of the asynchronous task are passed to this step. The result of the computation must
+ *     be returned by this step and will be passed back to the last step. This step
+ *     can also use {@link #publishProgress} to publish one or more units
+ *     of progress. These values are published on the UI thread, in the
+ *     {@link #onProgressUpdate} step.</li>
+ *     <li>{@link #onProgressUpdate}, invoked on the UI thread after a
+ *     call to {@link #publishProgress}. The timing of the execution is
+ *     undefined. This method is used to display any form of progress in the user
+ *     interface while the background computation is still executing. For instance,
+ *     it can be used to animate a progress bar or show logs in a text field.</li>
+ *     <li>{@link #onPostExecute}, invoked on the UI thread after the background
+ *     computation finishes. The result of the background computation is passed to
+ *     this step as a parameter.</li>
+ * </ol>
+ *
+ * <h2>Cancelling a task</h2>
+ * <p>A task can be cancelled at any time by invoking {@link #cancel(boolean)}. Invoking
+ * this method will cause subsequent calls to {@link #isCancelled()} to return true.
+ * After invoking this method, {@link #onCancelled(Object)}, instead of
+ * {@link #onPostExecute(Object)} will be invoked after {@link #doInBackground(Object[])}
+ * returns. To ensure that a task is cancelled as quickly as possible, you should always
+ * check the return value of {@link #isCancelled()} periodically from
+ * {@link #doInBackground(Object[])}, if possible (inside a loop for instance.)</p>
+ *
+ * <h2>Threading rules</h2>
+ * <p>There are a few threading rules that must be followed for this class to
+ * work properly:</p>
+ * <ul>
+ *     <li>The AsyncTask class must be loaded on the UI thread. This is done
+ *     automatically as of {@link android.os.Build.VERSION_CODES#JELLY_BEAN}.</li>
+ *     <li>The task instance must be created on the UI thread.</li>
+ *     <li>{@link #execute} must be invoked on the UI thread.</li>
+ *     <li>Do not call {@link #onPreExecute()}, {@link #onPostExecute},
+ *     {@link #doInBackground}, {@link #onProgressUpdate} manually.</li>
+ *     <li>The task can be executed only once (an exception will be thrown if
+ *     a second execution is attempted.)</li>
+ * </ul>
+ *
+ * <h2>Memory observability</h2>
+ * <p>AsyncTask guarantees that all callback calls are synchronized in such a way that the following
+ * operations are safe without explicit synchronizations.</p>
+ * <ul>
+ *     <li>Set member fields in the constructor or {@link #onPreExecute}, and refer to them
+ *     in {@link #doInBackground}.
+ *     <li>Set member fields in {@link #doInBackground}, and refer to them in
+ *     {@link #onProgressUpdate} and {@link #onPostExecute}.
+ * </ul>
+ *
+ * <h2>Order of execution</h2>
+ * <p>When first introduced, AsyncTasks were executed serially on a single background
+ * thread. Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this was changed
+ * to a pool of threads allowing multiple tasks to operate in parallel. Starting with
+ * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, tasks are executed on a single
+ * thread to avoid common application errors caused by parallel execution.</p>
+ * <p>If you truly want parallel execution, you can invoke
+ * {@link #executeOnExecutor(java.util.concurrent.Executor, Object[])} with
+ * {@link #THREAD_POOL_EXECUTOR}.</p>
+ */
+public abstract class AsyncTask<Params, Progress, Result> {
+    private static final String LOG_TAG = "AsyncTask";
+
+    private static final int CORE_POOL_SIZE = 5;
+    private static final int MAXIMUM_POOL_SIZE = 128;
+    private static final int KEEP_ALIVE = 1;
+
+    private static final ThreadFactory  sThreadFactory = new ThreadFactory() {
+        private final AtomicInteger mCount = new AtomicInteger(1);
+
+        public Thread newThread(Runnable r) {
+            return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
+        }
+    };
+
+    private static final BlockingQueue<Runnable> sPoolWorkQueue =
+            new LinkedBlockingQueue<Runnable>(10);
+
+    /**
+     * An {@link java.util.concurrent.Executor} that can be used to execute tasks in parallel.
+     */
+    public static final Executor THREAD_POOL_EXECUTOR
+            = new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE,
+            TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory,
+            new ThreadPoolExecutor.DiscardOldestPolicy());
+
+    /**
+     * An {@link java.util.concurrent.Executor} that executes tasks one at a time in serial
+     * order.  This serialization is global to a particular process.
+     */
+    public static final Executor SERIAL_EXECUTOR = Utils.hasHoneycomb() ? new SerialExecutor() :
+            Executors.newSingleThreadExecutor(sThreadFactory);
+
+    public static final Executor DUAL_THREAD_EXECUTOR =
+            Executors.newFixedThreadPool(2, sThreadFactory);
+
+    private static final int MESSAGE_POST_RESULT = 0x1;
+    private static final int MESSAGE_POST_PROGRESS = 0x2;
+
+    private static final InternalHandler sHandler = new InternalHandler();
+
+    private static volatile Executor sDefaultExecutor = SERIAL_EXECUTOR;
+    private final WorkerRunnable<Params, Result> mWorker;
+    private final FutureTask<Result> mFuture;
+
+    private volatile Status mStatus = Status.PENDING;
+
+    private final AtomicBoolean mCancelled = new AtomicBoolean();
+    private final AtomicBoolean mTaskInvoked = new AtomicBoolean();
+
+    @TargetApi(11)
+    private static class SerialExecutor implements Executor {
+        final ArrayDeque<Runnable> mTasks = new ArrayDeque<Runnable>();
+        Runnable mActive;
+
+        public synchronized void execute(final Runnable r) {
+            mTasks.offer(new Runnable() {
+                public void run() {
+                    try {
+                        r.run();
+                    } finally {
+                        scheduleNext();
+                    }
+                }
+            });
+            if (mActive == null) {
+                scheduleNext();
+            }
+        }
+
+        protected synchronized void scheduleNext() {
+            if ((mActive = mTasks.poll()) != null) {
+                THREAD_POOL_EXECUTOR.execute(mActive);
+            }
+        }
+    }
+
+    /**
+     * Indicates the current status of the task. Each status will be set only once
+     * during the lifetime of a task.
+     */
+    public enum Status {
+        /**
+         * Indicates that the task has not been executed yet.
+         */
+        PENDING,
+        /**
+         * Indicates that the task is running.
+         */
+        RUNNING,
+        /**
+         * Indicates that {@link AsyncTask#onPostExecute} has finished.
+         */
+        FINISHED,
+    }
+
+    /** @hide Used to force static handler to be created. */
+    public static void init() {
+        sHandler.getLooper();
+    }
+
+    /** @hide */
+    public static void setDefaultExecutor(Executor exec) {
+        sDefaultExecutor = exec;
+    }
+
+    /**
+     * Creates a new asynchronous task. This constructor must be invoked on the UI thread.
+     */
+    public AsyncTask() {
+        mWorker = new WorkerRunnable<Params, Result>() {
+            public Result call() throws Exception {
+                mTaskInvoked.set(true);
+
+                Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
+                //noinspection unchecked
+                return postResult(doInBackground(mParams));
+            }
+        };
+
+        mFuture = new FutureTask<Result>(mWorker) {
+            @Override
+            protected void done() {
+                try {
+                    postResultIfNotInvoked(get());
+                } catch (InterruptedException e) {
+                    android.util.Log.w(LOG_TAG, e);
+                } catch (ExecutionException e) {
+                    throw new RuntimeException("An error occured while executing doInBackground()",
+                            e.getCause());
+                } catch (CancellationException e) {
+                    postResultIfNotInvoked(null);
+                }
+            }
+        };
+    }
+
+    private void postResultIfNotInvoked(Result result) {
+        final boolean wasTaskInvoked = mTaskInvoked.get();
+        if (!wasTaskInvoked) {
+            postResult(result);
+        }
+    }
+
+    private Result postResult(Result result) {
+        @SuppressWarnings("unchecked")
+        Message message = sHandler.obtainMessage(MESSAGE_POST_RESULT,
+                new AsyncTaskResult<Result>(this, result));
+        message.sendToTarget();
+        return result;
+    }
+
+    /**
+     * Returns the current status of this task.
+     *
+     * @return The current status.
+     */
+    public final Status getStatus() {
+        return mStatus;
+    }
+
+    /**
+     * Override this method to perform a computation on a background thread. The
+     * specified parameters are the parameters passed to {@link #execute}
+     * by the caller of this task.
+     *
+     * This method can call {@link #publishProgress} to publish updates
+     * on the UI thread.
+     *
+     * @param params The parameters of the task.
+     *
+     * @return A result, defined by the subclass of this task.
+     *
+     * @see #onPreExecute()
+     * @see #onPostExecute
+     * @see #publishProgress
+     */
+    protected abstract Result doInBackground(Params... params);
+
+    /**
+     * Runs on the UI thread before {@link #doInBackground}.
+     *
+     * @see #onPostExecute
+     * @see #doInBackground
+     */
+    protected void onPreExecute() {
+    }
+
+    /**
+     * <p>Runs on the UI thread after {@link #doInBackground}. The
+     * specified result is the value returned by {@link #doInBackground}.</p>
+     *
+     * <p>This method won't be invoked if the task was cancelled.</p>
+     *
+     * @param result The result of the operation computed by {@link #doInBackground}.
+     *
+     * @see #onPreExecute
+     * @see #doInBackground
+     * @see #onCancelled(Object)
+     */
+    @SuppressWarnings({"UnusedDeclaration"})
+    protected void onPostExecute(Result result) {
+    }
+
+    /**
+     * Runs on the UI thread after {@link #publishProgress} is invoked.
+     * The specified values are the values passed to {@link #publishProgress}.
+     *
+     * @param values The values indicating progress.
+     *
+     * @see #publishProgress
+     * @see #doInBackground
+     */
+    @SuppressWarnings({"UnusedDeclaration"})
+    protected void onProgressUpdate(Progress... values) {
+    }
+
+    /**
+     * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
+     * {@link #doInBackground(Object[])} has finished.</p>
+     *
+     * <p>The default implementation simply invokes {@link #onCancelled()} and
+     * ignores the result. If you write your own implementation, do not call
+     * <code>super.onCancelled(result)</code>.</p>
+     *
+     * @param result The result, if any, computed in
+     *               {@link #doInBackground(Object[])}, can be null
+     *
+     * @see #cancel(boolean)
+     * @see #isCancelled()
+     */
+    @SuppressWarnings({"UnusedParameters"})
+    protected void onCancelled(Result result) {
+        onCancelled();
+    }
+
+    /**
+     * <p>Applications should preferably override {@link #onCancelled(Object)}.
+     * This method is invoked by the default implementation of
+     * {@link #onCancelled(Object)}.</p>
+     *
+     * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
+     * {@link #doInBackground(Object[])} has finished.</p>
+     *
+     * @see #onCancelled(Object)
+     * @see #cancel(boolean)
+     * @see #isCancelled()
+     */
+    protected void onCancelled() {
+    }
+
+    /**
+     * Returns <tt>true</tt> if this task was cancelled before it completed
+     * normally. If you are calling {@link #cancel(boolean)} on the task,
+     * the value returned by this method should be checked periodically from
+     * {@link #doInBackground(Object[])} to end the task as soon as possible.
+     *
+     * @return <tt>true</tt> if task was cancelled before it completed
+     *
+     * @see #cancel(boolean)
+     */
+    public final boolean isCancelled() {
+        return mCancelled.get();
+    }
+
+    /**
+     * <p>Attempts to cancel execution of this task.  This attempt will
+     * fail if the task has already completed, already been cancelled,
+     * or could not be cancelled for some other reason. If successful,
+     * and this task has not started when <tt>cancel</tt> is called,
+     * this task should never run. If the task has already started,
+     * then the <tt>mayInterruptIfRunning</tt> parameter determines
+     * whether the thread executing this task should be interrupted in
+     * an attempt to stop the task.</p>
+     *
+     * <p>Calling this method will result in {@link #onCancelled(Object)} being
+     * invoked on the UI thread after {@link #doInBackground(Object[])}
+     * returns. Calling this method guarantees that {@link #onPostExecute(Object)}
+     * is never invoked. After invoking this method, you should check the
+     * value returned by {@link #isCancelled()} periodically from
+     * {@link #doInBackground(Object[])} to finish the task as early as
+     * possible.</p>
+     *
+     * @param mayInterruptIfRunning <tt>true</tt> if the thread executing this
+     *        task should be interrupted; otherwise, in-progress tasks are allowed
+     *        to complete.
+     *
+     * @return <tt>false</tt> if the task could not be cancelled,
+     *         typically because it has already completed normally;
+     *         <tt>true</tt> otherwise
+     *
+     * @see #isCancelled()
+     * @see #onCancelled(Object)
+     */
+    public final boolean cancel(boolean mayInterruptIfRunning) {
+        mCancelled.set(true);
+        return mFuture.cancel(mayInterruptIfRunning);
+    }
+
+    /**
+     * Waits if necessary for the computation to complete, and then
+     * retrieves its result.
+     *
+     * @return The computed result.
+     *
+     * @throws java.util.concurrent.CancellationException If the computation was cancelled.
+     * @throws java.util.concurrent.ExecutionException If the computation threw an exception.
+     * @throws InterruptedException If the current thread was interrupted
+     *         while waiting.
+     */
+    public final Result get() throws InterruptedException, ExecutionException {
+        return mFuture.get();
+    }
+
+    /**
+     * Waits if necessary for at most the given time for the computation
+     * to complete, and then retrieves its result.
+     *
+     * @param timeout Time to wait before cancelling the operation.
+     * @param unit The time unit for the timeout.
+     *
+     * @return The computed result.
+     *
+     * @throws java.util.concurrent.CancellationException If the computation was cancelled.
+     * @throws java.util.concurrent.ExecutionException If the computation threw an exception.
+     * @throws InterruptedException If the current thread was interrupted
+     *         while waiting.
+     * @throws java.util.concurrent.TimeoutException If the wait timed out.
+     */
+    public final Result get(long timeout, TimeUnit unit) throws InterruptedException,
+            ExecutionException, TimeoutException {
+        return mFuture.get(timeout, unit);
+    }
+
+    /**
+     * Executes the task with the specified parameters. The task returns
+     * itself (this) so that the caller can keep a reference to it.
+     *
+     * <p>Note: this function schedules the task on a queue for a single background
+     * thread or pool of threads depending on the platform version.  When first
+     * introduced, AsyncTasks were executed serially on a single background thread.
+     * Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this was changed
+     * to a pool of threads allowing multiple tasks to operate in parallel. Starting
+     * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, tasks are back to being
+     * executed on a single thread to avoid common application errors caused
+     * by parallel execution.  If you truly want parallel execution, you can use
+     * the {@link #executeOnExecutor} version of this method
+     * with {@link #THREAD_POOL_EXECUTOR}; however, see commentary there for warnings
+     * on its use.
+     *
+     * <p>This method must be invoked on the UI thread.
+     *
+     * @param params The parameters of the task.
+     *
+     * @return This instance of AsyncTask.
+     *
+     * @throws IllegalStateException If {@link #getStatus()} returns either
+     *         {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
+     *
+     * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
+     * @see #execute(Runnable)
+     */
+    public final AsyncTask<Params, Progress, Result> execute(Params... params) {
+        return executeOnExecutor(sDefaultExecutor, params);
+    }
+
+    /**
+     * Executes the task with the specified parameters. The task returns
+     * itself (this) so that the caller can keep a reference to it.
+     *
+     * <p>This method is typically used with {@link #THREAD_POOL_EXECUTOR} to
+     * allow multiple tasks to run in parallel on a pool of threads managed by
+     * AsyncTask, however you can also use your own {@link java.util.concurrent.Executor} for custom
+     * behavior.
+     *
+     * <p><em>Warning:</em> Allowing multiple tasks to run in parallel from
+     * a thread pool is generally <em>not</em> what one wants, because the order
+     * of their operation is not defined.  For example, if these tasks are used
+     * to modify any state in common (such as writing a file due to a button click),
+     * there are no guarantees on the order of the modifications.
+     * Without careful work it is possible in rare cases for the newer version
+     * of the data to be over-written by an older one, leading to obscure data
+     * loss and stability issues.  Such changes are best
+     * executed in serial; to guarantee such work is serialized regardless of
+     * platform version you can use this function with {@link #SERIAL_EXECUTOR}.
+     *
+     * <p>This method must be invoked on the UI thread.
+     *
+     * @param exec The executor to use.  {@link #THREAD_POOL_EXECUTOR} is available as a
+     *              convenient process-wide thread pool for tasks that are loosely coupled.
+     * @param params The parameters of the task.
+     *
+     * @return This instance of AsyncTask.
+     *
+     * @throws IllegalStateException If {@link #getStatus()} returns either
+     *         {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
+     *
+     * @see #execute(Object[])
+     */
+    public final AsyncTask<Params, Progress, Result> executeOnExecutor(Executor exec,
+            Params... params) {
+        if (mStatus != Status.PENDING) {
+            switch (mStatus) {
+                case RUNNING:
+                    throw new IllegalStateException("Cannot execute task:"
+                            + " the task is already running.");
+                case FINISHED:
+                    throw new IllegalStateException("Cannot execute task:"
+                            + " the task has already been executed "
+                            + "(a task can be executed only once)");
+            }
+        }
+
+        mStatus = Status.RUNNING;
+
+        onPreExecute();
+
+        mWorker.mParams = params;
+        exec.execute(mFuture);
+
+        return this;
+    }
+
+    /**
+     * Convenience version of {@link #execute(Object...)} for use with
+     * a simple Runnable object. See {@link #execute(Object[])} for more
+     * information on the order of execution.
+     *
+     * @see #execute(Object[])
+     * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
+     */
+    public static void execute(Runnable runnable) {
+        sDefaultExecutor.execute(runnable);
+    }
+
+    /**
+     * This method can be invoked from {@link #doInBackground} to
+     * publish updates on the UI thread while the background computation is
+     * still running. Each call to this method will trigger the execution of
+     * {@link #onProgressUpdate} on the UI thread.
+     *
+     * {@link #onProgressUpdate} will note be called if the task has been
+     * canceled.
+     *
+     * @param values The progress values to update the UI with.
+     *
+     * @see #onProgressUpdate
+     * @see #doInBackground
+     */
+    protected final void publishProgress(Progress... values) {
+        if (!isCancelled()) {
+            sHandler.obtainMessage(MESSAGE_POST_PROGRESS,
+                    new AsyncTaskResult<Progress>(this, values)).sendToTarget();
+        }
+    }
+
+    private void finish(Result result) {
+        if (isCancelled()) {
+            onCancelled(result);
+        } else {
+            onPostExecute(result);
+        }
+        mStatus = Status.FINISHED;
+    }
+
+    private static class InternalHandler extends Handler {
+        @SuppressWarnings({"unchecked", "RawUseOfParameterizedType"})
+        @Override
+        public void handleMessage(Message msg) {
+            AsyncTaskResult result = (AsyncTaskResult) msg.obj;
+            switch (msg.what) {
+                case MESSAGE_POST_RESULT:
+                    // There is only one result
+                    result.mTask.finish(result.mData[0]);
+                    break;
+                case MESSAGE_POST_PROGRESS:
+                    result.mTask.onProgressUpdate(result.mData);
+                    break;
+            }
+        }
+    }
+
+    private static abstract class WorkerRunnable<Params, Result> implements Callable<Result> {
+        Params[] mParams;
+    }
+
+    @SuppressWarnings({"RawUseOfParameterizedType"})
+    private static class AsyncTaskResult<Data> {
+        final AsyncTask mTask;
+        final Data[] mData;
+
+        AsyncTaskResult(AsyncTask task, Data... data) {
+            mTask = task;
+            mData = data;
+        }
+    }
+}
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/DiskLruCache.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/DiskLruCache.java
new file mode 100644
index 0000000..4c14345
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/DiskLruCache.java
@@ -0,0 +1,953 @@
+/*
+ * Copyright (C) 2011 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.example.android.displayingbitmaps.util;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedWriter;
+import java.io.Closeable;
+import java.io.EOFException;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.Reader;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.lang.reflect.Array;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+/**
+ ******************************************************************************
+ * Taken from the JB source code, can be found in:
+ * libcore/luni/src/main/java/libcore/io/DiskLruCache.java
+ * or direct link:
+ * https://android.googlesource.com/platform/libcore/+/android-4.1.1_r1/luni/src/main/java/libcore/io/DiskLruCache.java
+ ******************************************************************************
+ *
+ * A cache that uses a bounded amount of space on a filesystem. Each cache
+ * entry has a string key and a fixed number of values. Values are byte
+ * sequences, accessible as streams or files. Each value must be between {@code
+ * 0} and {@code Integer.MAX_VALUE} bytes in length.
+ *
+ * <p>The cache stores its data in a directory on the filesystem. This
+ * directory must be exclusive to the cache; the cache may delete or overwrite
+ * files from its directory. It is an error for multiple processes to use the
+ * same cache directory at the same time.
+ *
+ * <p>This cache limits the number of bytes that it will store on the
+ * filesystem. When the number of stored bytes exceeds the limit, the cache will
+ * remove entries in the background until the limit is satisfied. The limit is
+ * not strict: the cache may temporarily exceed it while waiting for files to be
+ * deleted. The limit does not include filesystem overhead or the cache
+ * journal so space-sensitive applications should set a conservative limit.
+ *
+ * <p>Clients call {@link #edit} to create or update the values of an entry. An
+ * entry may have only one editor at one time; if a value is not available to be
+ * edited then {@link #edit} will return null.
+ * <ul>
+ *     <li>When an entry is being <strong>created</strong> it is necessary to
+ *         supply a full set of values; the empty value should be used as a
+ *         placeholder if necessary.
+ *     <li>When an entry is being <strong>edited</strong>, it is not necessary
+ *         to supply data for every value; values default to their previous
+ *         value.
+ * </ul>
+ * Every {@link #edit} call must be matched by a call to {@link Editor#commit}
+ * or {@link Editor#abort}. Committing is atomic: a read observes the full set
+ * of values as they were before or after the commit, but never a mix of values.
+ *
+ * <p>Clients call {@link #get} to read a snapshot of an entry. The read will
+ * observe the value at the time that {@link #get} was called. Updates and
+ * removals after the call do not impact ongoing reads.
+ *
+ * <p>This class is tolerant of some I/O errors. If files are missing from the
+ * filesystem, the corresponding entries will be dropped from the cache. If
+ * an error occurs while writing a cache value, the edit will fail silently.
+ * Callers should handle other problems by catching {@code IOException} and
+ * responding appropriately.
+ */
+public final class DiskLruCache implements Closeable {
+    static final String JOURNAL_FILE = "journal";
+    static final String JOURNAL_FILE_TMP = "journal.tmp";
+    static final String MAGIC = "libcore.io.DiskLruCache";
+    static final String VERSION_1 = "1";
+    static final long ANY_SEQUENCE_NUMBER = -1;
+    private static final String CLEAN = "CLEAN";
+    private static final String DIRTY = "DIRTY";
+    private static final String REMOVE = "REMOVE";
+    private static final String READ = "READ";
+
+    private static final Charset UTF_8 = Charset.forName("UTF-8");
+    private static final int IO_BUFFER_SIZE = 8 * 1024;
+
+    /*
+     * This cache uses a journal file named "journal". A typical journal file
+     * looks like this:
+     *     libcore.io.DiskLruCache
+     *     1
+     *     100
+     *     2
+     *
+     *     CLEAN 3400330d1dfc7f3f7f4b8d4d803dfcf6 832 21054
+     *     DIRTY 335c4c6028171cfddfbaae1a9c313c52
+     *     CLEAN 335c4c6028171cfddfbaae1a9c313c52 3934 2342
+     *     REMOVE 335c4c6028171cfddfbaae1a9c313c52
+     *     DIRTY 1ab96a171faeeee38496d8b330771a7a
+     *     CLEAN 1ab96a171faeeee38496d8b330771a7a 1600 234
+     *     READ 335c4c6028171cfddfbaae1a9c313c52
+     *     READ 3400330d1dfc7f3f7f4b8d4d803dfcf6
+     *
+     * The first five lines of the journal form its header. They are the
+     * constant string "libcore.io.DiskLruCache", the disk cache's version,
+     * the application's version, the value count, and a blank line.
+     *
+     * Each of the subsequent lines in the file is a record of the state of a
+     * cache entry. Each line contains space-separated values: a state, a key,
+     * and optional state-specific values.
+     *   o DIRTY lines track that an entry is actively being created or updated.
+     *     Every successful DIRTY action should be followed by a CLEAN or REMOVE
+     *     action. DIRTY lines without a matching CLEAN or REMOVE indicate that
+     *     temporary files may need to be deleted.
+     *   o CLEAN lines track a cache entry that has been successfully published
+     *     and may be read. A publish line is followed by the lengths of each of
+     *     its values.
+     *   o READ lines track accesses for LRU.
+     *   o REMOVE lines track entries that have been deleted.
+     *
+     * The journal file is appended to as cache operations occur. The journal may
+     * occasionally be compacted by dropping redundant lines. A temporary file named
+     * "journal.tmp" will be used during compaction; that file should be deleted if
+     * it exists when the cache is opened.
+     */
+
+    private final File directory;
+    private final File journalFile;
+    private final File journalFileTmp;
+    private final int appVersion;
+    private final long maxSize;
+    private final int valueCount;
+    private long size = 0;
+    private Writer journalWriter;
+    private final LinkedHashMap<String, Entry> lruEntries
+            = new LinkedHashMap<String, Entry>(0, 0.75f, true);
+    private int redundantOpCount;
+
+    /**
+     * To differentiate between old and current snapshots, each entry is given
+     * a sequence number each time an edit is committed. A snapshot is stale if
+     * its sequence number is not equal to its entry's sequence number.
+     */
+    private long nextSequenceNumber = 0;
+
+    /* From java.util.Arrays */
+    @SuppressWarnings("unchecked")
+    private static <T> T[] copyOfRange(T[] original, int start, int end) {
+        final int originalLength = original.length; // For exception priority compatibility.
+        if (start > end) {
+            throw new IllegalArgumentException();
+        }
+        if (start < 0 || start > originalLength) {
+            throw new ArrayIndexOutOfBoundsException();
+        }
+        final int resultLength = end - start;
+        final int copyLength = Math.min(resultLength, originalLength - start);
+        final T[] result = (T[]) Array
+                .newInstance(original.getClass().getComponentType(), resultLength);
+        System.arraycopy(original, start, result, 0, copyLength);
+        return result;
+    }
+
+    /**
+     * Returns the remainder of 'reader' as a string, closing it when done.
+     */
+    public static String readFully(Reader reader) throws IOException {
+        try {
+            StringWriter writer = new StringWriter();
+            char[] buffer = new char[1024];
+            int count;
+            while ((count = reader.read(buffer)) != -1) {
+                writer.write(buffer, 0, count);
+            }
+            return writer.toString();
+        } finally {
+            reader.close();
+        }
+    }
+
+    /**
+     * Returns the ASCII characters up to but not including the next "\r\n", or
+     * "\n".
+     *
+     * @throws java.io.EOFException if the stream is exhausted before the next newline
+     *     character.
+     */
+    public static String readAsciiLine(InputStream in) throws IOException {
+        // TODO: support UTF-8 here instead
+
+        StringBuilder result = new StringBuilder(80);
+        while (true) {
+            int c = in.read();
+            if (c == -1) {
+                throw new EOFException();
+            } else if (c == '\n') {
+                break;
+            }
+
+            result.append((char) c);
+        }
+        int length = result.length();
+        if (length > 0 && result.charAt(length - 1) == '\r') {
+            result.setLength(length - 1);
+        }
+        return result.toString();
+    }
+
+    /**
+     * Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null.
+     */
+    public static void closeQuietly(Closeable closeable) {
+        if (closeable != null) {
+            try {
+                closeable.close();
+            } catch (RuntimeException rethrown) {
+                throw rethrown;
+            } catch (Exception ignored) {
+            }
+        }
+    }
+
+    /**
+     * Recursively delete everything in {@code dir}.
+     */
+    // TODO: this should specify paths as Strings rather than as Files
+    public static void deleteContents(File dir) throws IOException {
+        File[] files = dir.listFiles();
+        if (files == null) {
+            throw new IllegalArgumentException("not a directory: " + dir);
+        }
+        for (File file : files) {
+            if (file.isDirectory()) {
+                deleteContents(file);
+            }
+            if (!file.delete()) {
+                throw new IOException("failed to delete file: " + file);
+            }
+        }
+    }
+
+    /** This cache uses a single background thread to evict entries. */
+    private final ExecutorService executorService = new ThreadPoolExecutor(0, 1,
+            60L, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
+    private final Callable<Void> cleanupCallable = new Callable<Void>() {
+        @Override public Void call() throws Exception {
+            synchronized (DiskLruCache.this) {
+                if (journalWriter == null) {
+                    return null; // closed
+                }
+                trimToSize();
+                if (journalRebuildRequired()) {
+                    rebuildJournal();
+                    redundantOpCount = 0;
+                }
+            }
+            return null;
+        }
+    };
+
+    private DiskLruCache(File directory, int appVersion, int valueCount, long maxSize) {
+        this.directory = directory;
+        this.appVersion = appVersion;
+        this.journalFile = new File(directory, JOURNAL_FILE);
+        this.journalFileTmp = new File(directory, JOURNAL_FILE_TMP);
+        this.valueCount = valueCount;
+        this.maxSize = maxSize;
+    }
+
+    /**
+     * Opens the cache in {@code directory}, creating a cache if none exists
+     * there.
+     *
+     * @param directory a writable directory
+     * @param appVersion
+     * @param valueCount the number of values per cache entry. Must be positive.
+     * @param maxSize the maximum number of bytes this cache should use to store
+     * @throws java.io.IOException if reading or writing the cache directory fails
+     */
+    public static DiskLruCache open(File directory, int appVersion, int valueCount, long maxSize)
+            throws IOException {
+        if (maxSize <= 0) {
+            throw new IllegalArgumentException("maxSize <= 0");
+        }
+        if (valueCount <= 0) {
+            throw new IllegalArgumentException("valueCount <= 0");
+        }
+
+        // prefer to pick up where we left off
+        DiskLruCache cache = new DiskLruCache(directory, appVersion, valueCount, maxSize);
+        if (cache.journalFile.exists()) {
+            try {
+                cache.readJournal();
+                cache.processJournal();
+                cache.journalWriter = new BufferedWriter(new FileWriter(cache.journalFile, true),
+                        IO_BUFFER_SIZE);
+                return cache;
+            } catch (IOException journalIsCorrupt) {
+//                System.logW("DiskLruCache " + directory + " is corrupt: "
+//                        + journalIsCorrupt.getMessage() + ", removing");
+                cache.delete();
+            }
+        }
+
+        // create a new empty cache
+        directory.mkdirs();
+        cache = new DiskLruCache(directory, appVersion, valueCount, maxSize);
+        cache.rebuildJournal();
+        return cache;
+    }
+
+    private void readJournal() throws IOException {
+        InputStream in = new BufferedInputStream(new FileInputStream(journalFile), IO_BUFFER_SIZE);
+        try {
+            String magic = readAsciiLine(in);
+            String version = readAsciiLine(in);
+            String appVersionString = readAsciiLine(in);
+            String valueCountString = readAsciiLine(in);
+            String blank = readAsciiLine(in);
+            if (!MAGIC.equals(magic)
+                    || !VERSION_1.equals(version)
+                    || !Integer.toString(appVersion).equals(appVersionString)
+                    || !Integer.toString(valueCount).equals(valueCountString)
+                    || !"".equals(blank)) {
+                throw new IOException("unexpected journal header: ["
+                        + magic + ", " + version + ", " + valueCountString + ", " + blank + "]");
+            }
+
+            while (true) {
+                try {
+                    readJournalLine(readAsciiLine(in));
+                } catch (EOFException endOfJournal) {
+                    break;
+                }
+            }
+        } finally {
+            closeQuietly(in);
+        }
+    }
+
+    private void readJournalLine(String line) throws IOException {
+        String[] parts = line.split(" ");
+        if (parts.length < 2) {
+            throw new IOException("unexpected journal line: " + line);
+        }
+
+        String key = parts[1];
+        if (parts[0].equals(REMOVE) && parts.length == 2) {
+            lruEntries.remove(key);
+            return;
+        }
+
+        Entry entry = lruEntries.get(key);
+        if (entry == null) {
+            entry = new Entry(key);
+            lruEntries.put(key, entry);
+        }
+
+        if (parts[0].equals(CLEAN) && parts.length == 2 + valueCount) {
+            entry.readable = true;
+            entry.currentEditor = null;
+            entry.setLengths(copyOfRange(parts, 2, parts.length));
+        } else if (parts[0].equals(DIRTY) && parts.length == 2) {
+            entry.currentEditor = new Editor(entry);
+        } else if (parts[0].equals(READ) && parts.length == 2) {
+            // this work was already done by calling lruEntries.get()
+        } else {
+            throw new IOException("unexpected journal line: " + line);
+        }
+    }
+
+    /**
+     * Computes the initial size and collects garbage as a part of opening the
+     * cache. Dirty entries are assumed to be inconsistent and will be deleted.
+     */
+    private void processJournal() throws IOException {
+        deleteIfExists(journalFileTmp);
+        for (Iterator<Entry> i = lruEntries.values().iterator(); i.hasNext(); ) {
+            Entry entry = i.next();
+            if (entry.currentEditor == null) {
+                for (int t = 0; t < valueCount; t++) {
+                    size += entry.lengths[t];
+                }
+            } else {
+                entry.currentEditor = null;
+                for (int t = 0; t < valueCount; t++) {
+                    deleteIfExists(entry.getCleanFile(t));
+                    deleteIfExists(entry.getDirtyFile(t));
+                }
+                i.remove();
+            }
+        }
+    }
+
+    /**
+     * Creates a new journal that omits redundant information. This replaces the
+     * current journal if it exists.
+     */
+    private synchronized void rebuildJournal() throws IOException {
+        if (journalWriter != null) {
+            journalWriter.close();
+        }
+
+        Writer writer = new BufferedWriter(new FileWriter(journalFileTmp), IO_BUFFER_SIZE);
+        writer.write(MAGIC);
+        writer.write("\n");
+        writer.write(VERSION_1);
+        writer.write("\n");
+        writer.write(Integer.toString(appVersion));
+        writer.write("\n");
+        writer.write(Integer.toString(valueCount));
+        writer.write("\n");
+        writer.write("\n");
+
+        for (Entry entry : lruEntries.values()) {
+            if (entry.currentEditor != null) {
+                writer.write(DIRTY + ' ' + entry.key + '\n');
+            } else {
+                writer.write(CLEAN + ' ' + entry.key + entry.getLengths() + '\n');
+            }
+        }
+
+        writer.close();
+        journalFileTmp.renameTo(journalFile);
+        journalWriter = new BufferedWriter(new FileWriter(journalFile, true), IO_BUFFER_SIZE);
+    }
+
+    private static void deleteIfExists(File file) throws IOException {
+//        try {
+//            Libcore.os.remove(file.getPath());
+//        } catch (ErrnoException errnoException) {
+//            if (errnoException.errno != OsConstants.ENOENT) {
+//                throw errnoException.rethrowAsIOException();
+//            }
+//        }
+        if (file.exists() && !file.delete()) {
+            throw new IOException();
+        }
+    }
+
+    /**
+     * Returns a snapshot of the entry named {@code key}, or null if it doesn't
+     * exist is not currently readable. If a value is returned, it is moved to
+     * the head of the LRU queue.
+     */
+    public synchronized Snapshot get(String key) throws IOException {
+        checkNotClosed();
+        validateKey(key);
+        Entry entry = lruEntries.get(key);
+        if (entry == null) {
+            return null;
+        }
+
+        if (!entry.readable) {
+            return null;
+        }
+
+        /*
+         * Open all streams eagerly to guarantee that we see a single published
+         * snapshot. If we opened streams lazily then the streams could come
+         * from different edits.
+         */
+        InputStream[] ins = new InputStream[valueCount];
+        try {
+            for (int i = 0; i < valueCount; i++) {
+                ins[i] = new FileInputStream(entry.getCleanFile(i));
+            }
+        } catch (FileNotFoundException e) {
+            // a file must have been deleted manually!
+            return null;
+        }
+
+        redundantOpCount++;
+        journalWriter.append(READ + ' ' + key + '\n');
+        if (journalRebuildRequired()) {
+            executorService.submit(cleanupCallable);
+        }
+
+        return new Snapshot(key, entry.sequenceNumber, ins);
+    }
+
+    /**
+     * Returns an editor for the entry named {@code key}, or null if another
+     * edit is in progress.
+     */
+    public Editor edit(String key) throws IOException {
+        return edit(key, ANY_SEQUENCE_NUMBER);
+    }
+
+    private synchronized Editor edit(String key, long expectedSequenceNumber) throws IOException {
+        checkNotClosed();
+        validateKey(key);
+        Entry entry = lruEntries.get(key);
+        if (expectedSequenceNumber != ANY_SEQUENCE_NUMBER
+                && (entry == null || entry.sequenceNumber != expectedSequenceNumber)) {
+            return null; // snapshot is stale
+        }
+        if (entry == null) {
+            entry = new Entry(key);
+            lruEntries.put(key, entry);
+        } else if (entry.currentEditor != null) {
+            return null; // another edit is in progress
+        }
+
+        Editor editor = new Editor(entry);
+        entry.currentEditor = editor;
+
+        // flush the journal before creating files to prevent file leaks
+        journalWriter.write(DIRTY + ' ' + key + '\n');
+        journalWriter.flush();
+        return editor;
+    }
+
+    /**
+     * Returns the directory where this cache stores its data.
+     */
+    public File getDirectory() {
+        return directory;
+    }
+
+    /**
+     * Returns the maximum number of bytes that this cache should use to store
+     * its data.
+     */
+    public long maxSize() {
+        return maxSize;
+    }
+
+    /**
+     * Returns the number of bytes currently being used to store the values in
+     * this cache. This may be greater than the max size if a background
+     * deletion is pending.
+     */
+    public synchronized long size() {
+        return size;
+    }
+
+    private synchronized void completeEdit(Editor editor, boolean success) throws IOException {
+        Entry entry = editor.entry;
+        if (entry.currentEditor != editor) {
+            throw new IllegalStateException();
+        }
+
+        // if this edit is creating the entry for the first time, every index must have a value
+        if (success && !entry.readable) {
+            for (int i = 0; i < valueCount; i++) {
+                if (!entry.getDirtyFile(i).exists()) {
+                    editor.abort();
+                    throw new IllegalStateException("edit didn't create file " + i);
+                }
+            }
+        }
+
+        for (int i = 0; i < valueCount; i++) {
+            File dirty = entry.getDirtyFile(i);
+            if (success) {
+                if (dirty.exists()) {
+                    File clean = entry.getCleanFile(i);
+                    dirty.renameTo(clean);
+                    long oldLength = entry.lengths[i];
+                    long newLength = clean.length();
+                    entry.lengths[i] = newLength;
+                    size = size - oldLength + newLength;
+                }
+            } else {
+                deleteIfExists(dirty);
+            }
+        }
+
+        redundantOpCount++;
+        entry.currentEditor = null;
+        if (entry.readable | success) {
+            entry.readable = true;
+            journalWriter.write(CLEAN + ' ' + entry.key + entry.getLengths() + '\n');
+            if (success) {
+                entry.sequenceNumber = nextSequenceNumber++;
+            }
+        } else {
+            lruEntries.remove(entry.key);
+            journalWriter.write(REMOVE + ' ' + entry.key + '\n');
+        }
+
+        if (size > maxSize || journalRebuildRequired()) {
+            executorService.submit(cleanupCallable);
+        }
+    }
+
+    /**
+     * We only rebuild the journal when it will halve the size of the journal
+     * and eliminate at least 2000 ops.
+     */
+    private boolean journalRebuildRequired() {
+        final int REDUNDANT_OP_COMPACT_THRESHOLD = 2000;
+        return redundantOpCount >= REDUNDANT_OP_COMPACT_THRESHOLD
+                && redundantOpCount >= lruEntries.size();
+    }
+
+    /**
+     * Drops the entry for {@code key} if it exists and can be removed. Entries
+     * actively being edited cannot be removed.
+     *
+     * @return true if an entry was removed.
+     */
+    public synchronized boolean remove(String key) throws IOException {
+        checkNotClosed();
+        validateKey(key);
+        Entry entry = lruEntries.get(key);
+        if (entry == null || entry.currentEditor != null) {
+            return false;
+        }
+
+        for (int i = 0; i < valueCount; i++) {
+            File file = entry.getCleanFile(i);
+            if (!file.delete()) {
+                throw new IOException("failed to delete " + file);
+            }
+            size -= entry.lengths[i];
+            entry.lengths[i] = 0;
+        }
+
+        redundantOpCount++;
+        journalWriter.append(REMOVE + ' ' + key + '\n');
+        lruEntries.remove(key);
+
+        if (journalRebuildRequired()) {
+            executorService.submit(cleanupCallable);
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns true if this cache has been closed.
+     */
+    public boolean isClosed() {
+        return journalWriter == null;
+    }
+
+    private void checkNotClosed() {
+        if (journalWriter == null) {
+            throw new IllegalStateException("cache is closed");
+        }
+    }
+
+    /**
+     * Force buffered operations to the filesystem.
+     */
+    public synchronized void flush() throws IOException {
+        checkNotClosed();
+        trimToSize();
+        journalWriter.flush();
+    }
+
+    /**
+     * Closes this cache. Stored values will remain on the filesystem.
+     */
+    public synchronized void close() throws IOException {
+        if (journalWriter == null) {
+            return; // already closed
+        }
+        for (Entry entry : new ArrayList<Entry>(lruEntries.values())) {
+            if (entry.currentEditor != null) {
+                entry.currentEditor.abort();
+            }
+        }
+        trimToSize();
+        journalWriter.close();
+        journalWriter = null;
+    }
+
+    private void trimToSize() throws IOException {
+        while (size > maxSize) {
+//            Map.Entry<String, Entry> toEvict = lruEntries.eldest();
+            final Map.Entry<String, Entry> toEvict = lruEntries.entrySet().iterator().next();
+            remove(toEvict.getKey());
+        }
+    }
+
+    /**
+     * Closes the cache and deletes all of its stored values. This will delete
+     * all files in the cache directory including files that weren't created by
+     * the cache.
+     */
+    public void delete() throws IOException {
+        close();
+        deleteContents(directory);
+    }
+
+    private void validateKey(String key) {
+        if (key.contains(" ") || key.contains("\n") || key.contains("\r")) {
+            throw new IllegalArgumentException(
+                    "keys must not contain spaces or newlines: \"" + key + "\"");
+        }
+    }
+
+    private static String inputStreamToString(InputStream in) throws IOException {
+        return readFully(new InputStreamReader(in, UTF_8));
+    }
+
+    /**
+     * A snapshot of the values for an entry.
+     */
+    public final class Snapshot implements Closeable {
+        private final String key;
+        private final long sequenceNumber;
+        private final InputStream[] ins;
+
+        private Snapshot(String key, long sequenceNumber, InputStream[] ins) {
+            this.key = key;
+            this.sequenceNumber = sequenceNumber;
+            this.ins = ins;
+        }
+
+        /**
+         * Returns an editor for this snapshot's entry, or null if either the
+         * entry has changed since this snapshot was created or if another edit
+         * is in progress.
+         */
+        public Editor edit() throws IOException {
+            return DiskLruCache.this.edit(key, sequenceNumber);
+        }
+
+        /**
+         * Returns the unbuffered stream with the value for {@code index}.
+         */
+        public InputStream getInputStream(int index) {
+            return ins[index];
+        }
+
+        /**
+         * Returns the string value for {@code index}.
+         */
+        public String getString(int index) throws IOException {
+            return inputStreamToString(getInputStream(index));
+        }
+
+        @Override public void close() {
+            for (InputStream in : ins) {
+                closeQuietly(in);
+            }
+        }
+    }
+
+    /**
+     * Edits the values for an entry.
+     */
+    public final class Editor {
+        private final Entry entry;
+        private boolean hasErrors;
+
+        private Editor(Entry entry) {
+            this.entry = entry;
+        }
+
+        /**
+         * Returns an unbuffered input stream to read the last committed value,
+         * or null if no value has been committed.
+         */
+        public InputStream newInputStream(int index) throws IOException {
+            synchronized (DiskLruCache.this) {
+                if (entry.currentEditor != this) {
+                    throw new IllegalStateException();
+                }
+                if (!entry.readable) {
+                    return null;
+                }
+                return new FileInputStream(entry.getCleanFile(index));
+            }
+        }
+
+        /**
+         * Returns the last committed value as a string, or null if no value
+         * has been committed.
+         */
+        public String getString(int index) throws IOException {
+            InputStream in = newInputStream(index);
+            return in != null ? inputStreamToString(in) : null;
+        }
+
+        /**
+         * Returns a new unbuffered output stream to write the value at
+         * {@code index}. If the underlying output stream encounters errors
+         * when writing to the filesystem, this edit will be aborted when
+         * {@link #commit} is called. The returned output stream does not throw
+         * IOExceptions.
+         */
+        public OutputStream newOutputStream(int index) throws IOException {
+            synchronized (DiskLruCache.this) {
+                if (entry.currentEditor != this) {
+                    throw new IllegalStateException();
+                }
+                return new FaultHidingOutputStream(new FileOutputStream(entry.getDirtyFile(index)));
+            }
+        }
+
+        /**
+         * Sets the value at {@code index} to {@code value}.
+         */
+        public void set(int index, String value) throws IOException {
+            Writer writer = null;
+            try {
+                writer = new OutputStreamWriter(newOutputStream(index), UTF_8);
+                writer.write(value);
+            } finally {
+                closeQuietly(writer);
+            }
+        }
+
+        /**
+         * Commits this edit so it is visible to readers.  This releases the
+         * edit lock so another edit may be started on the same key.
+         */
+        public void commit() throws IOException {
+            if (hasErrors) {
+                completeEdit(this, false);
+                remove(entry.key); // the previous entry is stale
+            } else {
+                completeEdit(this, true);
+            }
+        }
+
+        /**
+         * Aborts this edit. This releases the edit lock so another edit may be
+         * started on the same key.
+         */
+        public void abort() throws IOException {
+            completeEdit(this, false);
+        }
+
+        private class FaultHidingOutputStream extends FilterOutputStream {
+            private FaultHidingOutputStream(OutputStream out) {
+                super(out);
+            }
+
+            @Override public void write(int oneByte) {
+                try {
+                    out.write(oneByte);
+                } catch (IOException e) {
+                    hasErrors = true;
+                }
+            }
+
+            @Override public void write(byte[] buffer, int offset, int length) {
+                try {
+                    out.write(buffer, offset, length);
+                } catch (IOException e) {
+                    hasErrors = true;
+                }
+            }
+
+            @Override public void close() {
+                try {
+                    out.close();
+                } catch (IOException e) {
+                    hasErrors = true;
+                }
+            }
+
+            @Override public void flush() {
+                try {
+                    out.flush();
+                } catch (IOException e) {
+                    hasErrors = true;
+                }
+            }
+        }
+    }
+
+    private final class Entry {
+        private final String key;
+
+        /** Lengths of this entry's files. */
+        private final long[] lengths;
+
+        /** True if this entry has ever been published */
+        private boolean readable;
+
+        /** The ongoing edit or null if this entry is not being edited. */
+        private Editor currentEditor;
+
+        /** The sequence number of the most recently committed edit to this entry. */
+        private long sequenceNumber;
+
+        private Entry(String key) {
+            this.key = key;
+            this.lengths = new long[valueCount];
+        }
+
+        public String getLengths() throws IOException {
+            StringBuilder result = new StringBuilder();
+            for (long size : lengths) {
+                result.append(' ').append(size);
+            }
+            return result.toString();
+        }
+
+        /**
+         * Set lengths using decimal numbers like "10123".
+         */
+        private void setLengths(String[] strings) throws IOException {
+            if (strings.length != valueCount) {
+                throw invalidLengths(strings);
+            }
+
+            try {
+                for (int i = 0; i < strings.length; i++) {
+                    lengths[i] = Long.parseLong(strings[i]);
+                }
+            } catch (NumberFormatException e) {
+                throw invalidLengths(strings);
+            }
+        }
+
+        private IOException invalidLengths(String[] strings) throws IOException {
+            throw new IOException("unexpected journal line: " + Arrays.toString(strings));
+        }
+
+        public File getCleanFile(int i) {
+            return new File(directory, key + "." + i);
+        }
+
+        public File getDirtyFile(int i) {
+            return new File(directory, key + "." + i + ".tmp");
+        }
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageCache.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageCache.java
new file mode 100644
index 0000000..41da56c
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageCache.java
@@ -0,0 +1,738 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.util;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.CompressFormat;
+import android.graphics.Bitmap.Config;
+import android.graphics.BitmapFactory;
+import android.graphics.drawable.BitmapDrawable;
+import android.os.Build.VERSION_CODES;
+import android.os.Bundle;
+import android.os.Environment;
+import android.os.StatFs;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.util.LruCache;
+
+import com.example.android.common.logger.Log;
+import com.example.android.displayingbitmaps.BuildConfig;
+
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.lang.ref.SoftReference;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * This class handles disk and memory caching of bitmaps in conjunction with the
+ * {@link ImageWorker} class and its subclasses. Use
+ * {@link ImageCache#getInstance(android.support.v4.app.FragmentManager, ImageCacheParams)} to get an instance of this
+ * class, although usually a cache should be added directly to an {@link ImageWorker} by calling
+ * {@link ImageWorker#addImageCache(android.support.v4.app.FragmentManager, ImageCacheParams)}.
+ */
+public class ImageCache {
+    private static final String TAG = "ImageCache";
+
+    // Default memory cache size in kilobytes
+    private static final int DEFAULT_MEM_CACHE_SIZE = 1024 * 5; // 5MB
+
+    // Default disk cache size in bytes
+    private static final int DEFAULT_DISK_CACHE_SIZE = 1024 * 1024 * 10; // 10MB
+
+    // Compression settings when writing images to disk cache
+    private static final CompressFormat DEFAULT_COMPRESS_FORMAT = CompressFormat.JPEG;
+    private static final int DEFAULT_COMPRESS_QUALITY = 70;
+    private static final int DISK_CACHE_INDEX = 0;
+
+    // Constants to easily toggle various caches
+    private static final boolean DEFAULT_MEM_CACHE_ENABLED = true;
+    private static final boolean DEFAULT_DISK_CACHE_ENABLED = true;
+    private static final boolean DEFAULT_INIT_DISK_CACHE_ON_CREATE = false;
+
+    private DiskLruCache mDiskLruCache;
+    private LruCache<String, BitmapDrawable> mMemoryCache;
+    private ImageCacheParams mCacheParams;
+    private final Object mDiskCacheLock = new Object();
+    private boolean mDiskCacheStarting = true;
+
+    private Set<SoftReference<Bitmap>> mReusableBitmaps;
+
+    /**
+     * Create a new ImageCache object using the specified parameters. This should not be
+     * called directly by other classes, instead use
+     * {@link ImageCache#getInstance(android.support.v4.app.FragmentManager, ImageCacheParams)} to fetch an ImageCache
+     * instance.
+     *
+     * @param cacheParams The cache parameters to use to initialize the cache
+     */
+    private ImageCache(ImageCacheParams cacheParams) {
+        init(cacheParams);
+    }
+
+    /**
+     * Return an {@link ImageCache} instance. A {@link RetainFragment} is used to retain the
+     * ImageCache object across configuration changes such as a change in device orientation.
+     *
+     * @param fragmentManager The fragment manager to use when dealing with the retained fragment.
+     * @param cacheParams The cache parameters to use if the ImageCache needs instantiation.
+     * @return An existing retained ImageCache object or a new one if one did not exist
+     */
+    public static ImageCache getInstance(
+            FragmentManager fragmentManager, ImageCacheParams cacheParams) {
+
+        // Search for, or create an instance of the non-UI RetainFragment
+        final RetainFragment mRetainFragment = findOrCreateRetainFragment(fragmentManager);
+
+        // See if we already have an ImageCache stored in RetainFragment
+        ImageCache imageCache = (ImageCache) mRetainFragment.getObject();
+
+        // No existing ImageCache, create one and store it in RetainFragment
+        if (imageCache == null) {
+            imageCache = new ImageCache(cacheParams);
+            mRetainFragment.setObject(imageCache);
+        }
+
+        return imageCache;
+    }
+
+    /**
+     * Initialize the cache, providing all parameters.
+     *
+     * @param cacheParams The cache parameters to initialize the cache
+     */
+    private void init(ImageCacheParams cacheParams) {
+        mCacheParams = cacheParams;
+
+        //BEGIN_INCLUDE(init_memory_cache)
+        // Set up memory cache
+        if (mCacheParams.memoryCacheEnabled) {
+            if (BuildConfig.DEBUG) {
+                Log.d(TAG, "Memory cache created (size = " + mCacheParams.memCacheSize + ")");
+            }
+
+            // If we're running on Honeycomb or newer, create a set of reusable bitmaps that can be
+            // populated into the inBitmap field of BitmapFactory.Options. Note that the set is
+            // of SoftReferences which will actually not be very effective due to the garbage
+            // collector being aggressive clearing Soft/WeakReferences. A better approach
+            // would be to use a strongly references bitmaps, however this would require some
+            // balancing of memory usage between this set and the bitmap LruCache. It would also
+            // require knowledge of the expected size of the bitmaps. From Honeycomb to JellyBean
+            // the size would need to be precise, from KitKat onward the size would just need to
+            // be the upper bound (due to changes in how inBitmap can re-use bitmaps).
+            if (Utils.hasHoneycomb()) {
+                mReusableBitmaps =
+                        Collections.synchronizedSet(new HashSet<SoftReference<Bitmap>>());
+            }
+
+            mMemoryCache = new LruCache<String, BitmapDrawable>(mCacheParams.memCacheSize) {
+
+                /**
+                 * Notify the removed entry that is no longer being cached
+                 */
+                @Override
+                protected void entryRemoved(boolean evicted, String key,
+                        BitmapDrawable oldValue, BitmapDrawable newValue) {
+                    if (RecyclingBitmapDrawable.class.isInstance(oldValue)) {
+                        // The removed entry is a recycling drawable, so notify it
+                        // that it has been removed from the memory cache
+                        ((RecyclingBitmapDrawable) oldValue).setIsCached(false);
+                    } else {
+                        // The removed entry is a standard BitmapDrawable
+
+                        if (Utils.hasHoneycomb()) {
+                            // We're running on Honeycomb or later, so add the bitmap
+                            // to a SoftReference set for possible use with inBitmap later
+                            mReusableBitmaps.add(new SoftReference<Bitmap>(oldValue.getBitmap()));
+                        }
+                    }
+                }
+
+                /**
+                 * Measure item size in kilobytes rather than units which is more practical
+                 * for a bitmap cache
+                 */
+                @Override
+                protected int sizeOf(String key, BitmapDrawable value) {
+                    final int bitmapSize = getBitmapSize(value) / 1024;
+                    return bitmapSize == 0 ? 1 : bitmapSize;
+                }
+            };
+        }
+        //END_INCLUDE(init_memory_cache)
+
+        // By default the disk cache is not initialized here as it should be initialized
+        // on a separate thread due to disk access.
+        if (cacheParams.initDiskCacheOnCreate) {
+            // Set up disk cache
+            initDiskCache();
+        }
+    }
+
+    /**
+     * Initializes the disk cache.  Note that this includes disk access so this should not be
+     * executed on the main/UI thread. By default an ImageCache does not initialize the disk
+     * cache when it is created, instead you should call initDiskCache() to initialize it on a
+     * background thread.
+     */
+    public void initDiskCache() {
+        // Set up disk cache
+        synchronized (mDiskCacheLock) {
+            if (mDiskLruCache == null || mDiskLruCache.isClosed()) {
+                File diskCacheDir = mCacheParams.diskCacheDir;
+                if (mCacheParams.diskCacheEnabled && diskCacheDir != null) {
+                    if (!diskCacheDir.exists()) {
+                        diskCacheDir.mkdirs();
+                    }
+                    if (getUsableSpace(diskCacheDir) > mCacheParams.diskCacheSize) {
+                        try {
+                            mDiskLruCache = DiskLruCache.open(
+                                    diskCacheDir, 1, 1, mCacheParams.diskCacheSize);
+                            if (BuildConfig.DEBUG) {
+                                Log.d(TAG, "Disk cache initialized");
+                            }
+                        } catch (final IOException e) {
+                            mCacheParams.diskCacheDir = null;
+                            Log.e(TAG, "initDiskCache - " + e);
+                        }
+                    }
+                }
+            }
+            mDiskCacheStarting = false;
+            mDiskCacheLock.notifyAll();
+        }
+    }
+
+    /**
+     * Adds a bitmap to both memory and disk cache.
+     * @param data Unique identifier for the bitmap to store
+     * @param value The bitmap drawable to store
+     */
+    public void addBitmapToCache(String data, BitmapDrawable value) {
+        //BEGIN_INCLUDE(add_bitmap_to_cache)
+        if (data == null || value == null) {
+            return;
+        }
+
+        // Add to memory cache
+        if (mMemoryCache != null) {
+            if (RecyclingBitmapDrawable.class.isInstance(value)) {
+                // The removed entry is a recycling drawable, so notify it
+                // that it has been added into the memory cache
+                ((RecyclingBitmapDrawable) value).setIsCached(true);
+            }
+            mMemoryCache.put(data, value);
+        }
+
+        synchronized (mDiskCacheLock) {
+            // Add to disk cache
+            if (mDiskLruCache != null) {
+                final String key = hashKeyForDisk(data);
+                OutputStream out = null;
+                try {
+                    DiskLruCache.Snapshot snapshot = mDiskLruCache.get(key);
+                    if (snapshot == null) {
+                        final DiskLruCache.Editor editor = mDiskLruCache.edit(key);
+                        if (editor != null) {
+                            out = editor.newOutputStream(DISK_CACHE_INDEX);
+                            value.getBitmap().compress(
+                                    mCacheParams.compressFormat, mCacheParams.compressQuality, out);
+                            editor.commit();
+                            out.close();
+                        }
+                    } else {
+                        snapshot.getInputStream(DISK_CACHE_INDEX).close();
+                    }
+                } catch (final IOException e) {
+                    Log.e(TAG, "addBitmapToCache - " + e);
+                } catch (Exception e) {
+                    Log.e(TAG, "addBitmapToCache - " + e);
+                } finally {
+                    try {
+                        if (out != null) {
+                            out.close();
+                        }
+                    } catch (IOException e) {}
+                }
+            }
+        }
+        //END_INCLUDE(add_bitmap_to_cache)
+    }
+
+    /**
+     * Get from memory cache.
+     *
+     * @param data Unique identifier for which item to get
+     * @return The bitmap drawable if found in cache, null otherwise
+     */
+    public BitmapDrawable getBitmapFromMemCache(String data) {
+        //BEGIN_INCLUDE(get_bitmap_from_mem_cache)
+        BitmapDrawable memValue = null;
+
+        if (mMemoryCache != null) {
+            memValue = mMemoryCache.get(data);
+        }
+
+        if (BuildConfig.DEBUG && memValue != null) {
+            Log.d(TAG, "Memory cache hit");
+        }
+
+        return memValue;
+        //END_INCLUDE(get_bitmap_from_mem_cache)
+    }
+
+    /**
+     * Get from disk cache.
+     *
+     * @param data Unique identifier for which item to get
+     * @return The bitmap if found in cache, null otherwise
+     */
+    public Bitmap getBitmapFromDiskCache(String data) {
+        //BEGIN_INCLUDE(get_bitmap_from_disk_cache)
+        final String key = hashKeyForDisk(data);
+        Bitmap bitmap = null;
+
+        synchronized (mDiskCacheLock) {
+            while (mDiskCacheStarting) {
+                try {
+                    mDiskCacheLock.wait();
+                } catch (InterruptedException e) {}
+            }
+            if (mDiskLruCache != null) {
+                InputStream inputStream = null;
+                try {
+                    final DiskLruCache.Snapshot snapshot = mDiskLruCache.get(key);
+                    if (snapshot != null) {
+                        if (BuildConfig.DEBUG) {
+                            Log.d(TAG, "Disk cache hit");
+                        }
+                        inputStream = snapshot.getInputStream(DISK_CACHE_INDEX);
+                        if (inputStream != null) {
+                            FileDescriptor fd = ((FileInputStream) inputStream).getFD();
+
+                            // Decode bitmap, but we don't want to sample so give
+                            // MAX_VALUE as the target dimensions
+                            bitmap = ImageResizer.decodeSampledBitmapFromDescriptor(
+                                    fd, Integer.MAX_VALUE, Integer.MAX_VALUE, this);
+                        }
+                    }
+                } catch (final IOException e) {
+                    Log.e(TAG, "getBitmapFromDiskCache - " + e);
+                } finally {
+                    try {
+                        if (inputStream != null) {
+                            inputStream.close();
+                        }
+                    } catch (IOException e) {}
+                }
+            }
+            return bitmap;
+        }
+        //END_INCLUDE(get_bitmap_from_disk_cache)
+    }
+
+    /**
+     * @param options - BitmapFactory.Options with out* options populated
+     * @return Bitmap that case be used for inBitmap
+     */
+    protected Bitmap getBitmapFromReusableSet(BitmapFactory.Options options) {
+        //BEGIN_INCLUDE(get_bitmap_from_reusable_set)
+        Bitmap bitmap = null;
+
+        if (mReusableBitmaps != null && !mReusableBitmaps.isEmpty()) {
+            synchronized (mReusableBitmaps) {
+                final Iterator<SoftReference<Bitmap>> iterator = mReusableBitmaps.iterator();
+                Bitmap item;
+
+                while (iterator.hasNext()) {
+                    item = iterator.next().get();
+
+                    if (null != item && item.isMutable()) {
+                        // Check to see it the item can be used for inBitmap
+                        if (canUseForInBitmap(item, options)) {
+                            bitmap = item;
+
+                            // Remove from reusable set so it can't be used again
+                            iterator.remove();
+                            break;
+                        }
+                    } else {
+                        // Remove from the set if the reference has been cleared.
+                        iterator.remove();
+                    }
+                }
+            }
+        }
+
+        return bitmap;
+        //END_INCLUDE(get_bitmap_from_reusable_set)
+    }
+
+    /**
+     * Clears both the memory and disk cache associated with this ImageCache object. Note that
+     * this includes disk access so this should not be executed on the main/UI thread.
+     */
+    public void clearCache() {
+        if (mMemoryCache != null) {
+            mMemoryCache.evictAll();
+            if (BuildConfig.DEBUG) {
+                Log.d(TAG, "Memory cache cleared");
+            }
+        }
+
+        synchronized (mDiskCacheLock) {
+            mDiskCacheStarting = true;
+            if (mDiskLruCache != null && !mDiskLruCache.isClosed()) {
+                try {
+                    mDiskLruCache.delete();
+                    if (BuildConfig.DEBUG) {
+                        Log.d(TAG, "Disk cache cleared");
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "clearCache - " + e);
+                }
+                mDiskLruCache = null;
+                initDiskCache();
+            }
+        }
+    }
+
+    /**
+     * Flushes the disk cache associated with this ImageCache object. Note that this includes
+     * disk access so this should not be executed on the main/UI thread.
+     */
+    public void flush() {
+        synchronized (mDiskCacheLock) {
+            if (mDiskLruCache != null) {
+                try {
+                    mDiskLruCache.flush();
+                    if (BuildConfig.DEBUG) {
+                        Log.d(TAG, "Disk cache flushed");
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "flush - " + e);
+                }
+            }
+        }
+    }
+
+    /**
+     * Closes the disk cache associated with this ImageCache object. Note that this includes
+     * disk access so this should not be executed on the main/UI thread.
+     */
+    public void close() {
+        synchronized (mDiskCacheLock) {
+            if (mDiskLruCache != null) {
+                try {
+                    if (!mDiskLruCache.isClosed()) {
+                        mDiskLruCache.close();
+                        mDiskLruCache = null;
+                        if (BuildConfig.DEBUG) {
+                            Log.d(TAG, "Disk cache closed");
+                        }
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "close - " + e);
+                }
+            }
+        }
+    }
+
+    /**
+     * A holder class that contains cache parameters.
+     */
+    public static class ImageCacheParams {
+        public int memCacheSize = DEFAULT_MEM_CACHE_SIZE;
+        public int diskCacheSize = DEFAULT_DISK_CACHE_SIZE;
+        public File diskCacheDir;
+        public CompressFormat compressFormat = DEFAULT_COMPRESS_FORMAT;
+        public int compressQuality = DEFAULT_COMPRESS_QUALITY;
+        public boolean memoryCacheEnabled = DEFAULT_MEM_CACHE_ENABLED;
+        public boolean diskCacheEnabled = DEFAULT_DISK_CACHE_ENABLED;
+        public boolean initDiskCacheOnCreate = DEFAULT_INIT_DISK_CACHE_ON_CREATE;
+
+        /**
+         * Create a set of image cache parameters that can be provided to
+         * {@link ImageCache#getInstance(android.support.v4.app.FragmentManager, ImageCacheParams)} or
+         * {@link ImageWorker#addImageCache(android.support.v4.app.FragmentManager, ImageCacheParams)}.
+         * @param context A context to use.
+         * @param diskCacheDirectoryName A unique subdirectory name that will be appended to the
+         *                               application cache directory. Usually "cache" or "images"
+         *                               is sufficient.
+         */
+        public ImageCacheParams(Context context, String diskCacheDirectoryName) {
+            diskCacheDir = getDiskCacheDir(context, diskCacheDirectoryName);
+        }
+
+        /**
+         * Sets the memory cache size based on a percentage of the max available VM memory.
+         * Eg. setting percent to 0.2 would set the memory cache to one fifth of the available
+         * memory. Throws {@link IllegalArgumentException} if percent is < 0.01 or > .8.
+         * memCacheSize is stored in kilobytes instead of bytes as this will eventually be passed
+         * to construct a LruCache which takes an int in its constructor.
+         *
+         * This value should be chosen carefully based on a number of factors
+         * Refer to the corresponding Android Training class for more discussion:
+         * http://developer.android.com/training/displaying-bitmaps/
+         *
+         * @param percent Percent of available app memory to use to size memory cache
+         */
+        public void setMemCacheSizePercent(float percent) {
+            if (percent < 0.01f || percent > 0.8f) {
+                throw new IllegalArgumentException("setMemCacheSizePercent - percent must be "
+                        + "between 0.01 and 0.8 (inclusive)");
+            }
+            memCacheSize = Math.round(percent * Runtime.getRuntime().maxMemory() / 1024);
+        }
+    }
+
+    /**
+     * @param candidate - Bitmap to check
+     * @param targetOptions - Options that have the out* value populated
+     * @return true if <code>candidate</code> can be used for inBitmap re-use with
+     *      <code>targetOptions</code>
+     */
+    @TargetApi(VERSION_CODES.KITKAT)
+    private static boolean canUseForInBitmap(
+            Bitmap candidate, BitmapFactory.Options targetOptions) {
+        //BEGIN_INCLUDE(can_use_for_inbitmap)
+        if (!Utils.hasKitKat()) {
+            // On earlier versions, the dimensions must match exactly and the inSampleSize must be 1
+            return candidate.getWidth() == targetOptions.outWidth
+                    && candidate.getHeight() == targetOptions.outHeight
+                    && targetOptions.inSampleSize == 1;
+        }
+
+        // From Android 4.4 (KitKat) onward we can re-use if the byte size of the new bitmap
+        // is smaller than the reusable bitmap candidate allocation byte count.
+        int width = targetOptions.outWidth / targetOptions.inSampleSize;
+        int height = targetOptions.outHeight / targetOptions.inSampleSize;
+        int byteCount = width * height * getBytesPerPixel(candidate.getConfig());
+        return byteCount <= candidate.getAllocationByteCount();
+        //END_INCLUDE(can_use_for_inbitmap)
+    }
+
+    /**
+     * Return the byte usage per pixel of a bitmap based on its configuration.
+     * @param config The bitmap configuration.
+     * @return The byte usage per pixel.
+     */
+    private static int getBytesPerPixel(Config config) {
+        if (config == Config.ARGB_8888) {
+            return 4;
+        } else if (config == Config.RGB_565) {
+            return 2;
+        } else if (config == Config.ARGB_4444) {
+            return 2;
+        } else if (config == Config.ALPHA_8) {
+            return 1;
+        }
+        return 1;
+    }
+
+    /**
+     * Get a usable cache directory (external if available, internal otherwise).
+     *
+     * @param context The context to use
+     * @param uniqueName A unique directory name to append to the cache dir
+     * @return The cache dir
+     */
+    public static File getDiskCacheDir(Context context, String uniqueName) {
+        // Check if media is mounted or storage is built-in, if so, try and use external cache dir
+        // otherwise use internal cache dir
+        final String cachePath =
+                Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
+                        !isExternalStorageRemovable() ? getExternalCacheDir(context).getPath() :
+                                context.getCacheDir().getPath();
+
+        return new File(cachePath + File.separator + uniqueName);
+    }
+
+    /**
+     * A hashing method that changes a string (like a URL) into a hash suitable for using as a
+     * disk filename.
+     */
+    public static String hashKeyForDisk(String key) {
+        String cacheKey;
+        try {
+            final MessageDigest mDigest = MessageDigest.getInstance("MD5");
+            mDigest.update(key.getBytes());
+            cacheKey = bytesToHexString(mDigest.digest());
+        } catch (NoSuchAlgorithmException e) {
+            cacheKey = String.valueOf(key.hashCode());
+        }
+        return cacheKey;
+    }
+
+    private static String bytesToHexString(byte[] bytes) {
+        // http://stackoverflow.com/questions/332079
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < bytes.length; i++) {
+            String hex = Integer.toHexString(0xFF & bytes[i]);
+            if (hex.length() == 1) {
+                sb.append('0');
+            }
+            sb.append(hex);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * Get the size in bytes of a bitmap in a BitmapDrawable. Note that from Android 4.4 (KitKat)
+     * onward this returns the allocated memory size of the bitmap which can be larger than the
+     * actual bitmap data byte count (in the case it was re-used).
+     *
+     * @param value
+     * @return size in bytes
+     */
+    @TargetApi(VERSION_CODES.KITKAT)
+    public static int getBitmapSize(BitmapDrawable value) {
+        Bitmap bitmap = value.getBitmap();
+
+        // From KitKat onward use getAllocationByteCount() as allocated bytes can potentially be
+        // larger than bitmap byte count.
+        if (Utils.hasKitKat()) {
+            return bitmap.getAllocationByteCount();
+        }
+
+        if (Utils.hasHoneycombMR1()) {
+            return bitmap.getByteCount();
+        }
+
+        // Pre HC-MR1
+        return bitmap.getRowBytes() * bitmap.getHeight();
+    }
+
+    /**
+     * Check if external storage is built-in or removable.
+     *
+     * @return True if external storage is removable (like an SD card), false
+     *         otherwise.
+     */
+    @TargetApi(VERSION_CODES.GINGERBREAD)
+    public static boolean isExternalStorageRemovable() {
+        if (Utils.hasGingerbread()) {
+            return Environment.isExternalStorageRemovable();
+        }
+        return true;
+    }
+
+    /**
+     * Get the external app cache directory.
+     *
+     * @param context The context to use
+     * @return The external cache dir
+     */
+    @TargetApi(VERSION_CODES.FROYO)
+    public static File getExternalCacheDir(Context context) {
+        if (Utils.hasFroyo()) {
+            return context.getExternalCacheDir();
+        }
+
+        // Before Froyo we need to construct the external cache dir ourselves
+        final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
+        return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
+    }
+
+    /**
+     * Check how much usable space is available at a given path.
+     *
+     * @param path The path to check
+     * @return The space available in bytes
+     */
+    @TargetApi(VERSION_CODES.GINGERBREAD)
+    public static long getUsableSpace(File path) {
+        if (Utils.hasGingerbread()) {
+            return path.getUsableSpace();
+        }
+        final StatFs stats = new StatFs(path.getPath());
+        return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks();
+    }
+
+    /**
+     * Locate an existing instance of this Fragment or if not found, create and
+     * add it using FragmentManager.
+     *
+     * @param fm The FragmentManager manager to use.
+     * @return The existing instance of the Fragment or the new instance if just
+     *         created.
+     */
+    private static RetainFragment findOrCreateRetainFragment(FragmentManager fm) {
+        //BEGIN_INCLUDE(find_create_retain_fragment)
+        // Check to see if we have retained the worker fragment.
+        RetainFragment mRetainFragment = (RetainFragment) fm.findFragmentByTag(TAG);
+
+        // If not retained (or first time running), we need to create and add it.
+        if (mRetainFragment == null) {
+            mRetainFragment = new RetainFragment();
+            fm.beginTransaction().add(mRetainFragment, TAG).commitAllowingStateLoss();
+        }
+
+        return mRetainFragment;
+        //END_INCLUDE(find_create_retain_fragment)
+    }
+
+    /**
+     * A simple non-UI Fragment that stores a single Object and is retained over configuration
+     * changes. It will be used to retain the ImageCache object.
+     */
+    public static class RetainFragment extends Fragment {
+        private Object mObject;
+
+        /**
+         * Empty constructor as per the Fragment documentation
+         */
+        public RetainFragment() {}
+
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Make sure this Fragment is retained over a configuration change
+            setRetainInstance(true);
+        }
+
+        /**
+         * Store a single object in this Fragment.
+         *
+         * @param object The object to store
+         */
+        public void setObject(Object object) {
+            mObject = object;
+        }
+
+        /**
+         * Get the stored object.
+         *
+         * @return The stored object
+         */
+        public Object getObject() {
+            return mObject;
+        }
+    }
+
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageFetcher.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageFetcher.java
new file mode 100644
index 0000000..b9ccb68
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageFetcher.java
@@ -0,0 +1,311 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.util;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.os.Build;
+import android.widget.Toast;
+
+import com.example.android.common.logger.Log;
+import com.example.android.displayingbitmaps.BuildConfig;
+import com.example.android.displayingbitmaps.R;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+/**
+ * A simple subclass of {@link ImageResizer} that fetches and resizes images fetched from a URL.
+ */
+public class ImageFetcher extends ImageResizer {
+    private static final String TAG = "ImageFetcher";
+    private static final int HTTP_CACHE_SIZE = 10 * 1024 * 1024; // 10MB
+    private static final String HTTP_CACHE_DIR = "http";
+    private static final int IO_BUFFER_SIZE = 8 * 1024;
+
+    private DiskLruCache mHttpDiskCache;
+    private File mHttpCacheDir;
+    private boolean mHttpDiskCacheStarting = true;
+    private final Object mHttpDiskCacheLock = new Object();
+    private static final int DISK_CACHE_INDEX = 0;
+
+    /**
+     * Initialize providing a target image width and height for the processing images.
+     *
+     * @param context
+     * @param imageWidth
+     * @param imageHeight
+     */
+    public ImageFetcher(Context context, int imageWidth, int imageHeight) {
+        super(context, imageWidth, imageHeight);
+        init(context);
+    }
+
+    /**
+     * Initialize providing a single target image size (used for both width and height);
+     *
+     * @param context
+     * @param imageSize
+     */
+    public ImageFetcher(Context context, int imageSize) {
+        super(context, imageSize);
+        init(context);
+    }
+
+    private void init(Context context) {
+        checkConnection(context);
+        mHttpCacheDir = ImageCache.getDiskCacheDir(context, HTTP_CACHE_DIR);
+    }
+
+    @Override
+    protected void initDiskCacheInternal() {
+        super.initDiskCacheInternal();
+        initHttpDiskCache();
+    }
+
+    private void initHttpDiskCache() {
+        if (!mHttpCacheDir.exists()) {
+            mHttpCacheDir.mkdirs();
+        }
+        synchronized (mHttpDiskCacheLock) {
+            if (ImageCache.getUsableSpace(mHttpCacheDir) > HTTP_CACHE_SIZE) {
+                try {
+                    mHttpDiskCache = DiskLruCache.open(mHttpCacheDir, 1, 1, HTTP_CACHE_SIZE);
+                    if (BuildConfig.DEBUG) {
+                        Log.d(TAG, "HTTP cache initialized");
+                    }
+                } catch (IOException e) {
+                    mHttpDiskCache = null;
+                }
+            }
+            mHttpDiskCacheStarting = false;
+            mHttpDiskCacheLock.notifyAll();
+        }
+    }
+
+    @Override
+    protected void clearCacheInternal() {
+        super.clearCacheInternal();
+        synchronized (mHttpDiskCacheLock) {
+            if (mHttpDiskCache != null && !mHttpDiskCache.isClosed()) {
+                try {
+                    mHttpDiskCache.delete();
+                    if (BuildConfig.DEBUG) {
+                        Log.d(TAG, "HTTP cache cleared");
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "clearCacheInternal - " + e);
+                }
+                mHttpDiskCache = null;
+                mHttpDiskCacheStarting = true;
+                initHttpDiskCache();
+            }
+        }
+    }
+
+    @Override
+    protected void flushCacheInternal() {
+        super.flushCacheInternal();
+        synchronized (mHttpDiskCacheLock) {
+            if (mHttpDiskCache != null) {
+                try {
+                    mHttpDiskCache.flush();
+                    if (BuildConfig.DEBUG) {
+                        Log.d(TAG, "HTTP cache flushed");
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "flush - " + e);
+                }
+            }
+        }
+    }
+
+    @Override
+    protected void closeCacheInternal() {
+        super.closeCacheInternal();
+        synchronized (mHttpDiskCacheLock) {
+            if (mHttpDiskCache != null) {
+                try {
+                    if (!mHttpDiskCache.isClosed()) {
+                        mHttpDiskCache.close();
+                        mHttpDiskCache = null;
+                        if (BuildConfig.DEBUG) {
+                            Log.d(TAG, "HTTP cache closed");
+                        }
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "closeCacheInternal - " + e);
+                }
+            }
+        }
+    }
+
+    /**
+    * Simple network connection check.
+    *
+    * @param context
+    */
+    private void checkConnection(Context context) {
+        final ConnectivityManager cm =
+                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        final NetworkInfo networkInfo = cm.getActiveNetworkInfo();
+        if (networkInfo == null || !networkInfo.isConnectedOrConnecting()) {
+            Toast.makeText(context, R.string.no_network_connection_toast, Toast.LENGTH_LONG).show();
+            Log.e(TAG, "checkConnection - no connection found");
+        }
+    }
+
+    /**
+     * The main process method, which will be called by the ImageWorker in the AsyncTask background
+     * thread.
+     *
+     * @param data The data to load the bitmap, in this case, a regular http URL
+     * @return The downloaded and resized bitmap
+     */
+    private Bitmap processBitmap(String data) {
+        if (BuildConfig.DEBUG) {
+            Log.d(TAG, "processBitmap - " + data);
+        }
+
+        final String key = ImageCache.hashKeyForDisk(data);
+        FileDescriptor fileDescriptor = null;
+        FileInputStream fileInputStream = null;
+        DiskLruCache.Snapshot snapshot;
+        synchronized (mHttpDiskCacheLock) {
+            // Wait for disk cache to initialize
+            while (mHttpDiskCacheStarting) {
+                try {
+                    mHttpDiskCacheLock.wait();
+                } catch (InterruptedException e) {}
+            }
+
+            if (mHttpDiskCache != null) {
+                try {
+                    snapshot = mHttpDiskCache.get(key);
+                    if (snapshot == null) {
+                        if (BuildConfig.DEBUG) {
+                            Log.d(TAG, "processBitmap, not found in http cache, downloading...");
+                        }
+                        DiskLruCache.Editor editor = mHttpDiskCache.edit(key);
+                        if (editor != null) {
+                            if (downloadUrlToStream(data,
+                                    editor.newOutputStream(DISK_CACHE_INDEX))) {
+                                editor.commit();
+                            } else {
+                                editor.abort();
+                            }
+                        }
+                        snapshot = mHttpDiskCache.get(key);
+                    }
+                    if (snapshot != null) {
+                        fileInputStream =
+                                (FileInputStream) snapshot.getInputStream(DISK_CACHE_INDEX);
+                        fileDescriptor = fileInputStream.getFD();
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "processBitmap - " + e);
+                } catch (IllegalStateException e) {
+                    Log.e(TAG, "processBitmap - " + e);
+                } finally {
+                    if (fileDescriptor == null && fileInputStream != null) {
+                        try {
+                            fileInputStream.close();
+                        } catch (IOException e) {}
+                    }
+                }
+            }
+        }
+
+        Bitmap bitmap = null;
+        if (fileDescriptor != null) {
+            bitmap = decodeSampledBitmapFromDescriptor(fileDescriptor, mImageWidth,
+                    mImageHeight, getImageCache());
+        }
+        if (fileInputStream != null) {
+            try {
+                fileInputStream.close();
+            } catch (IOException e) {}
+        }
+        return bitmap;
+    }
+
+    @Override
+    protected Bitmap processBitmap(Object data) {
+        return processBitmap(String.valueOf(data));
+    }
+
+    /**
+     * Download a bitmap from a URL and write the content to an output stream.
+     *
+     * @param urlString The URL to fetch
+     * @return true if successful, false otherwise
+     */
+    public boolean downloadUrlToStream(String urlString, OutputStream outputStream) {
+        disableConnectionReuseIfNecessary();
+        HttpURLConnection urlConnection = null;
+        BufferedOutputStream out = null;
+        BufferedInputStream in = null;
+
+        try {
+            final URL url = new URL(urlString);
+            urlConnection = (HttpURLConnection) url.openConnection();
+            in = new BufferedInputStream(urlConnection.getInputStream(), IO_BUFFER_SIZE);
+            out = new BufferedOutputStream(outputStream, IO_BUFFER_SIZE);
+
+            int b;
+            while ((b = in.read()) != -1) {
+                out.write(b);
+            }
+            return true;
+        } catch (final IOException e) {
+            Log.e(TAG, "Error in downloadBitmap - " + e);
+        } finally {
+            if (urlConnection != null) {
+                urlConnection.disconnect();
+            }
+            try {
+                if (out != null) {
+                    out.close();
+                }
+                if (in != null) {
+                    in.close();
+                }
+            } catch (final IOException e) {}
+        }
+        return false;
+    }
+
+    /**
+     * Workaround for bug pre-Froyo, see here for more info:
+     * http://android-developers.blogspot.com/2011/09/androids-http-clients.html
+     */
+    public static void disableConnectionReuseIfNecessary() {
+        // HTTP connection reuse which was buggy pre-froyo
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO) {
+            System.setProperty("http.keepAlive", "false");
+        }
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageResizer.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageResizer.java
new file mode 100644
index 0000000..be91096
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageResizer.java
@@ -0,0 +1,270 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.util;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.Build;
+
+import com.example.android.common.logger.Log;
+import com.example.android.displayingbitmaps.BuildConfig;
+
+import java.io.FileDescriptor;
+
+/**
+ * A simple subclass of {@link ImageWorker} that resizes images from resources given a target width
+ * and height. Useful for when the input images might be too large to simply load directly into
+ * memory.
+ */
+public class ImageResizer extends ImageWorker {
+    private static final String TAG = "ImageResizer";
+    protected int mImageWidth;
+    protected int mImageHeight;
+
+    /**
+     * Initialize providing a single target image size (used for both width and height);
+     *
+     * @param context
+     * @param imageWidth
+     * @param imageHeight
+     */
+    public ImageResizer(Context context, int imageWidth, int imageHeight) {
+        super(context);
+        setImageSize(imageWidth, imageHeight);
+    }
+
+    /**
+     * Initialize providing a single target image size (used for both width and height);
+     *
+     * @param context
+     * @param imageSize
+     */
+    public ImageResizer(Context context, int imageSize) {
+        super(context);
+        setImageSize(imageSize);
+    }
+
+    /**
+     * Set the target image width and height.
+     *
+     * @param width
+     * @param height
+     */
+    public void setImageSize(int width, int height) {
+        mImageWidth = width;
+        mImageHeight = height;
+    }
+
+    /**
+     * Set the target image size (width and height will be the same).
+     *
+     * @param size
+     */
+    public void setImageSize(int size) {
+        setImageSize(size, size);
+    }
+
+    /**
+     * The main processing method. This happens in a background task. In this case we are just
+     * sampling down the bitmap and returning it from a resource.
+     *
+     * @param resId
+     * @return
+     */
+    private Bitmap processBitmap(int resId) {
+        if (BuildConfig.DEBUG) {
+            Log.d(TAG, "processBitmap - " + resId);
+        }
+        return decodeSampledBitmapFromResource(mResources, resId, mImageWidth,
+                mImageHeight, getImageCache());
+    }
+
+    @Override
+    protected Bitmap processBitmap(Object data) {
+        return processBitmap(Integer.parseInt(String.valueOf(data)));
+    }
+
+    /**
+     * Decode and sample down a bitmap from resources to the requested width and height.
+     *
+     * @param res The resources object containing the image data
+     * @param resId The resource id of the image data
+     * @param reqWidth The requested width of the resulting bitmap
+     * @param reqHeight The requested height of the resulting bitmap
+     * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
+     * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
+     *         that are equal to or greater than the requested width and height
+     */
+    public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
+            int reqWidth, int reqHeight, ImageCache cache) {
+
+        // BEGIN_INCLUDE (read_bitmap_dimensions)
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        BitmapFactory.decodeResource(res, resId, options);
+
+        // Calculate inSampleSize
+        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
+        // END_INCLUDE (read_bitmap_dimensions)
+
+        // If we're running on Honeycomb or newer, try to use inBitmap
+        if (Utils.hasHoneycomb()) {
+            addInBitmapOptions(options, cache);
+        }
+
+        // Decode bitmap with inSampleSize set
+        options.inJustDecodeBounds = false;
+        return BitmapFactory.decodeResource(res, resId, options);
+    }
+
+    /**
+     * Decode and sample down a bitmap from a file to the requested width and height.
+     *
+     * @param filename The full path of the file to decode
+     * @param reqWidth The requested width of the resulting bitmap
+     * @param reqHeight The requested height of the resulting bitmap
+     * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
+     * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
+     *         that are equal to or greater than the requested width and height
+     */
+    public static Bitmap decodeSampledBitmapFromFile(String filename,
+            int reqWidth, int reqHeight, ImageCache cache) {
+
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        BitmapFactory.decodeFile(filename, options);
+
+        // Calculate inSampleSize
+        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
+
+        // If we're running on Honeycomb or newer, try to use inBitmap
+        if (Utils.hasHoneycomb()) {
+            addInBitmapOptions(options, cache);
+        }
+
+        // Decode bitmap with inSampleSize set
+        options.inJustDecodeBounds = false;
+        return BitmapFactory.decodeFile(filename, options);
+    }
+
+    /**
+     * Decode and sample down a bitmap from a file input stream to the requested width and height.
+     *
+     * @param fileDescriptor The file descriptor to read from
+     * @param reqWidth The requested width of the resulting bitmap
+     * @param reqHeight The requested height of the resulting bitmap
+     * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
+     * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
+     *         that are equal to or greater than the requested width and height
+     */
+    public static Bitmap decodeSampledBitmapFromDescriptor(
+            FileDescriptor fileDescriptor, int reqWidth, int reqHeight, ImageCache cache) {
+
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
+
+        // Calculate inSampleSize
+        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
+
+        // Decode bitmap with inSampleSize set
+        options.inJustDecodeBounds = false;
+
+        // If we're running on Honeycomb or newer, try to use inBitmap
+        if (Utils.hasHoneycomb()) {
+            addInBitmapOptions(options, cache);
+        }
+
+        return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
+    }
+
+    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+    private static void addInBitmapOptions(BitmapFactory.Options options, ImageCache cache) {
+        //BEGIN_INCLUDE(add_bitmap_options)
+        // inBitmap only works with mutable bitmaps so force the decoder to
+        // return mutable bitmaps.
+        options.inMutable = true;
+
+        if (cache != null) {
+            // Try and find a bitmap to use for inBitmap
+            Bitmap inBitmap = cache.getBitmapFromReusableSet(options);
+
+            if (inBitmap != null) {
+                options.inBitmap = inBitmap;
+            }
+        }
+        //END_INCLUDE(add_bitmap_options)
+    }
+
+    /**
+     * Calculate an inSampleSize for use in a {@link android.graphics.BitmapFactory.Options} object when decoding
+     * bitmaps using the decode* methods from {@link android.graphics.BitmapFactory}. This implementation calculates
+     * the closest inSampleSize that is a power of 2 and will result in the final decoded bitmap
+     * having a width and height equal to or larger than the requested width and height.
+     *
+     * @param options An options object with out* params already populated (run through a decode*
+     *            method with inJustDecodeBounds==true
+     * @param reqWidth The requested width of the resulting bitmap
+     * @param reqHeight The requested height of the resulting bitmap
+     * @return The value to be used for inSampleSize
+     */
+    public static int calculateInSampleSize(BitmapFactory.Options options,
+            int reqWidth, int reqHeight) {
+        // BEGIN_INCLUDE (calculate_sample_size)
+        // Raw height and width of image
+        final int height = options.outHeight;
+        final int width = options.outWidth;
+        int inSampleSize = 1;
+
+        if (height > reqHeight || width > reqWidth) {
+
+            final int halfHeight = height / 2;
+            final int halfWidth = width / 2;
+
+            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
+            // height and width larger than the requested height and width.
+            while ((halfHeight / inSampleSize) > reqHeight
+                    && (halfWidth / inSampleSize) > reqWidth) {
+                inSampleSize *= 2;
+            }
+
+            // This offers some additional logic in case the image has a strange
+            // aspect ratio. For example, a panorama may have a much larger
+            // width than height. In these cases the total pixels might still
+            // end up being too large to fit comfortably in memory, so we should
+            // be more aggressive with sample down the image (=larger inSampleSize).
+
+            long totalPixels = width * height / inSampleSize;
+
+            // Anything more than 2x the requested pixels we'll sample down further
+            final long totalReqPixelsCap = reqWidth * reqHeight * 2;
+
+            while (totalPixels > totalReqPixelsCap) {
+                inSampleSize *= 2;
+                totalPixels /= 2;
+            }
+        }
+        return inSampleSize;
+        // END_INCLUDE (calculate_sample_size)
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageWorker.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageWorker.java
new file mode 100644
index 0000000..f44d00d
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/ImageWorker.java
@@ -0,0 +1,485 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.util;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.TransitionDrawable;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.FragmentManager;
+import android.widget.ImageView;
+
+import com.example.android.common.logger.Log;
+import com.example.android.displayingbitmaps.BuildConfig;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * This class wraps up completing some arbitrary long running work when loading a bitmap to an
+ * ImageView. It handles things like using a memory and disk cache, running the work in a background
+ * thread and setting a placeholder image.
+ */
+public abstract class ImageWorker {
+    private static final String TAG = "ImageWorker";
+    private static final int FADE_IN_TIME = 200;
+
+    private ImageCache mImageCache;
+    private ImageCache.ImageCacheParams mImageCacheParams;
+    private Bitmap mLoadingBitmap;
+    private boolean mFadeInBitmap = true;
+    private boolean mExitTasksEarly = false;
+    protected boolean mPauseWork = false;
+    private final Object mPauseWorkLock = new Object();
+
+    protected Resources mResources;
+
+    private static final int MESSAGE_CLEAR = 0;
+    private static final int MESSAGE_INIT_DISK_CACHE = 1;
+    private static final int MESSAGE_FLUSH = 2;
+    private static final int MESSAGE_CLOSE = 3;
+
+    protected ImageWorker(Context context) {
+        mResources = context.getResources();
+    }
+
+    /**
+     * Load an image specified by the data parameter into an ImageView (override
+     * {@link ImageWorker#processBitmap(Object)} to define the processing logic). A memory and
+     * disk cache will be used if an {@link ImageCache} has been added using
+     * {@link ImageWorker#addImageCache(android.support.v4.app.FragmentManager, ImageCache.ImageCacheParams)}. If the
+     * image is found in the memory cache, it is set immediately, otherwise an {@link AsyncTask}
+     * will be created to asynchronously load the bitmap.
+     *
+     * @param data The URL of the image to download.
+     * @param imageView The ImageView to bind the downloaded image to.
+     */
+    public void loadImage(Object data, ImageView imageView) {
+        if (data == null) {
+            return;
+        }
+
+        BitmapDrawable value = null;
+
+        if (mImageCache != null) {
+            value = mImageCache.getBitmapFromMemCache(String.valueOf(data));
+        }
+
+        if (value != null) {
+            // Bitmap found in memory cache
+            imageView.setImageDrawable(value);
+        } else if (cancelPotentialWork(data, imageView)) {
+            //BEGIN_INCLUDE(execute_background_task)
+            final BitmapWorkerTask task = new BitmapWorkerTask(data, imageView);
+            final AsyncDrawable asyncDrawable =
+                    new AsyncDrawable(mResources, mLoadingBitmap, task);
+            imageView.setImageDrawable(asyncDrawable);
+
+            // NOTE: This uses a custom version of AsyncTask that has been pulled from the
+            // framework and slightly modified. Refer to the docs at the top of the class
+            // for more info on what was changed.
+            task.executeOnExecutor(AsyncTask.DUAL_THREAD_EXECUTOR);
+            //END_INCLUDE(execute_background_task)
+        }
+    }
+
+    /**
+     * Set placeholder bitmap that shows when the the background thread is running.
+     *
+     * @param bitmap
+     */
+    public void setLoadingImage(Bitmap bitmap) {
+        mLoadingBitmap = bitmap;
+    }
+
+    /**
+     * Set placeholder bitmap that shows when the the background thread is running.
+     *
+     * @param resId
+     */
+    public void setLoadingImage(int resId) {
+        mLoadingBitmap = BitmapFactory.decodeResource(mResources, resId);
+    }
+
+    /**
+     * Adds an {@link ImageCache} to this {@link ImageWorker} to handle disk and memory bitmap
+     * caching.
+     * @param fragmentManager
+     * @param cacheParams The cache parameters to use for the image cache.
+     */
+    public void addImageCache(FragmentManager fragmentManager,
+            ImageCache.ImageCacheParams cacheParams) {
+        mImageCacheParams = cacheParams;
+        mImageCache = ImageCache.getInstance(fragmentManager, mImageCacheParams);
+        new CacheAsyncTask().execute(MESSAGE_INIT_DISK_CACHE);
+    }
+
+    /**
+     * Adds an {@link ImageCache} to this {@link ImageWorker} to handle disk and memory bitmap
+     * caching.
+     * @param activity
+     * @param diskCacheDirectoryName See
+     * {@link ImageCache.ImageCacheParams#ImageCacheParams(android.content.Context, String)}.
+     */
+    public void addImageCache(FragmentActivity activity, String diskCacheDirectoryName) {
+        mImageCacheParams = new ImageCache.ImageCacheParams(activity, diskCacheDirectoryName);
+        mImageCache = ImageCache.getInstance(activity.getSupportFragmentManager(), mImageCacheParams);
+        new CacheAsyncTask().execute(MESSAGE_INIT_DISK_CACHE);
+    }
+
+    /**
+     * If set to true, the image will fade-in once it has been loaded by the background thread.
+     */
+    public void setImageFadeIn(boolean fadeIn) {
+        mFadeInBitmap = fadeIn;
+    }
+
+    public void setExitTasksEarly(boolean exitTasksEarly) {
+        mExitTasksEarly = exitTasksEarly;
+        setPauseWork(false);
+    }
+
+    /**
+     * Subclasses should override this to define any processing or work that must happen to produce
+     * the final bitmap. This will be executed in a background thread and be long running. For
+     * example, you could resize a large bitmap here, or pull down an image from the network.
+     *
+     * @param data The data to identify which image to process, as provided by
+     *            {@link ImageWorker#loadImage(Object, android.widget.ImageView)}
+     * @return The processed bitmap
+     */
+    protected abstract Bitmap processBitmap(Object data);
+
+    /**
+     * @return The {@link ImageCache} object currently being used by this ImageWorker.
+     */
+    protected ImageCache getImageCache() {
+        return mImageCache;
+    }
+
+    /**
+     * Cancels any pending work attached to the provided ImageView.
+     * @param imageView
+     */
+    public static void cancelWork(ImageView imageView) {
+        final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
+        if (bitmapWorkerTask != null) {
+            bitmapWorkerTask.cancel(true);
+            if (BuildConfig.DEBUG) {
+                final Object bitmapData = bitmapWorkerTask.mData;
+                Log.d(TAG, "cancelWork - cancelled work for " + bitmapData);
+            }
+        }
+    }
+
+    /**
+     * Returns true if the current work has been canceled or if there was no work in
+     * progress on this image view.
+     * Returns false if the work in progress deals with the same data. The work is not
+     * stopped in that case.
+     */
+    public static boolean cancelPotentialWork(Object data, ImageView imageView) {
+        //BEGIN_INCLUDE(cancel_potential_work)
+        final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
+
+        if (bitmapWorkerTask != null) {
+            final Object bitmapData = bitmapWorkerTask.mData;
+            if (bitmapData == null || !bitmapData.equals(data)) {
+                bitmapWorkerTask.cancel(true);
+                if (BuildConfig.DEBUG) {
+                    Log.d(TAG, "cancelPotentialWork - cancelled work for " + data);
+                }
+            } else {
+                // The same work is already in progress.
+                return false;
+            }
+        }
+        return true;
+        //END_INCLUDE(cancel_potential_work)
+    }
+
+    /**
+     * @param imageView Any imageView
+     * @return Retrieve the currently active work task (if any) associated with this imageView.
+     * null if there is no such task.
+     */
+    private static BitmapWorkerTask getBitmapWorkerTask(ImageView imageView) {
+        if (imageView != null) {
+            final Drawable drawable = imageView.getDrawable();
+            if (drawable instanceof AsyncDrawable) {
+                final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
+                return asyncDrawable.getBitmapWorkerTask();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * The actual AsyncTask that will asynchronously process the image.
+     */
+    private class BitmapWorkerTask extends AsyncTask<Void, Void, BitmapDrawable> {
+        private Object mData;
+        private final WeakReference<ImageView> imageViewReference;
+
+        public BitmapWorkerTask(Object data, ImageView imageView) {
+            mData = data;
+            imageViewReference = new WeakReference<ImageView>(imageView);
+        }
+
+        /**
+         * Background processing.
+         */
+        @Override
+        protected BitmapDrawable doInBackground(Void... params) {
+            //BEGIN_INCLUDE(load_bitmap_in_background)
+            if (BuildConfig.DEBUG) {
+                Log.d(TAG, "doInBackground - starting work");
+            }
+
+            final String dataString = String.valueOf(mData);
+            Bitmap bitmap = null;
+            BitmapDrawable drawable = null;
+
+            // Wait here if work is paused and the task is not cancelled
+            synchronized (mPauseWorkLock) {
+                while (mPauseWork && !isCancelled()) {
+                    try {
+                        mPauseWorkLock.wait();
+                    } catch (InterruptedException e) {}
+                }
+            }
+
+            // If the image cache is available and this task has not been cancelled by another
+            // thread and the ImageView that was originally bound to this task is still bound back
+            // to this task and our "exit early" flag is not set then try and fetch the bitmap from
+            // the cache
+            if (mImageCache != null && !isCancelled() && getAttachedImageView() != null
+                    && !mExitTasksEarly) {
+                bitmap = mImageCache.getBitmapFromDiskCache(dataString);
+            }
+
+            // If the bitmap was not found in the cache and this task has not been cancelled by
+            // another thread and the ImageView that was originally bound to this task is still
+            // bound back to this task and our "exit early" flag is not set, then call the main
+            // process method (as implemented by a subclass)
+            if (bitmap == null && !isCancelled() && getAttachedImageView() != null
+                    && !mExitTasksEarly) {
+                bitmap = processBitmap(mData);
+            }
+
+            // If the bitmap was processed and the image cache is available, then add the processed
+            // bitmap to the cache for future use. Note we don't check if the task was cancelled
+            // here, if it was, and the thread is still running, we may as well add the processed
+            // bitmap to our cache as it might be used again in the future
+            if (bitmap != null) {
+                if (Utils.hasHoneycomb()) {
+                    // Running on Honeycomb or newer, so wrap in a standard BitmapDrawable
+                    drawable = new BitmapDrawable(mResources, bitmap);
+                } else {
+                    // Running on Gingerbread or older, so wrap in a RecyclingBitmapDrawable
+                    // which will recycle automagically
+                    drawable = new RecyclingBitmapDrawable(mResources, bitmap);
+                }
+
+                if (mImageCache != null) {
+                    mImageCache.addBitmapToCache(dataString, drawable);
+                }
+            }
+
+            if (BuildConfig.DEBUG) {
+                Log.d(TAG, "doInBackground - finished work");
+            }
+
+            return drawable;
+            //END_INCLUDE(load_bitmap_in_background)
+        }
+
+        /**
+         * Once the image is processed, associates it to the imageView
+         */
+        @Override
+        protected void onPostExecute(BitmapDrawable value) {
+            //BEGIN_INCLUDE(complete_background_work)
+            // if cancel was called on this task or the "exit early" flag is set then we're done
+            if (isCancelled() || mExitTasksEarly) {
+                value = null;
+            }
+
+            final ImageView imageView = getAttachedImageView();
+            if (value != null && imageView != null) {
+                if (BuildConfig.DEBUG) {
+                    Log.d(TAG, "onPostExecute - setting bitmap");
+                }
+                setImageDrawable(imageView, value);
+            }
+            //END_INCLUDE(complete_background_work)
+        }
+
+        @Override
+        protected void onCancelled(BitmapDrawable value) {
+            super.onCancelled(value);
+            synchronized (mPauseWorkLock) {
+                mPauseWorkLock.notifyAll();
+            }
+        }
+
+        /**
+         * Returns the ImageView associated with this task as long as the ImageView's task still
+         * points to this task as well. Returns null otherwise.
+         */
+        private ImageView getAttachedImageView() {
+            final ImageView imageView = imageViewReference.get();
+            final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
+
+            if (this == bitmapWorkerTask) {
+                return imageView;
+            }
+
+            return null;
+        }
+    }
+
+    /**
+     * A custom Drawable that will be attached to the imageView while the work is in progress.
+     * Contains a reference to the actual worker task, so that it can be stopped if a new binding is
+     * required, and makes sure that only the last started worker process can bind its result,
+     * independently of the finish order.
+     */
+    private static class AsyncDrawable extends BitmapDrawable {
+        private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;
+
+        public AsyncDrawable(Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) {
+            super(res, bitmap);
+            bitmapWorkerTaskReference =
+                new WeakReference<BitmapWorkerTask>(bitmapWorkerTask);
+        }
+
+        public BitmapWorkerTask getBitmapWorkerTask() {
+            return bitmapWorkerTaskReference.get();
+        }
+    }
+
+    /**
+     * Called when the processing is complete and the final drawable should be 
+     * set on the ImageView.
+     *
+     * @param imageView
+     * @param drawable
+     */
+    private void setImageDrawable(ImageView imageView, Drawable drawable) {
+        if (mFadeInBitmap) {
+            // Transition drawable with a transparent drawable and the final drawable
+            final TransitionDrawable td =
+                    new TransitionDrawable(new Drawable[] {
+                            new ColorDrawable(android.R.color.transparent),
+                            drawable
+                    });
+            // Set background to loading bitmap
+            imageView.setBackgroundDrawable(
+                    new BitmapDrawable(mResources, mLoadingBitmap));
+
+            imageView.setImageDrawable(td);
+            td.startTransition(FADE_IN_TIME);
+        } else {
+            imageView.setImageDrawable(drawable);
+        }
+    }
+
+    /**
+     * Pause any ongoing background work. This can be used as a temporary
+     * measure to improve performance. For example background work could
+     * be paused when a ListView or GridView is being scrolled using a
+     * {@link android.widget.AbsListView.OnScrollListener} to keep
+     * scrolling smooth.
+     * <p>
+     * If work is paused, be sure setPauseWork(false) is called again
+     * before your fragment or activity is destroyed (for example during
+     * {@link android.app.Activity#onPause()}), or there is a risk the
+     * background thread will never finish.
+     */
+    public void setPauseWork(boolean pauseWork) {
+        synchronized (mPauseWorkLock) {
+            mPauseWork = pauseWork;
+            if (!mPauseWork) {
+                mPauseWorkLock.notifyAll();
+            }
+        }
+    }
+
+    protected class CacheAsyncTask extends AsyncTask<Object, Void, Void> {
+
+        @Override
+        protected Void doInBackground(Object... params) {
+            switch ((Integer)params[0]) {
+                case MESSAGE_CLEAR:
+                    clearCacheInternal();
+                    break;
+                case MESSAGE_INIT_DISK_CACHE:
+                    initDiskCacheInternal();
+                    break;
+                case MESSAGE_FLUSH:
+                    flushCacheInternal();
+                    break;
+                case MESSAGE_CLOSE:
+                    closeCacheInternal();
+                    break;
+            }
+            return null;
+        }
+    }
+
+    protected void initDiskCacheInternal() {
+        if (mImageCache != null) {
+            mImageCache.initDiskCache();
+        }
+    }
+
+    protected void clearCacheInternal() {
+        if (mImageCache != null) {
+            mImageCache.clearCache();
+        }
+    }
+
+    protected void flushCacheInternal() {
+        if (mImageCache != null) {
+            mImageCache.flush();
+        }
+    }
+
+    protected void closeCacheInternal() {
+        if (mImageCache != null) {
+            mImageCache.close();
+            mImageCache = null;
+        }
+    }
+
+    public void clearCache() {
+        new CacheAsyncTask().execute(MESSAGE_CLEAR);
+    }
+
+    public void flushCache() {
+        new CacheAsyncTask().execute(MESSAGE_FLUSH);
+    }
+
+    public void closeCache() {
+        new CacheAsyncTask().execute(MESSAGE_CLOSE);
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/RecyclingBitmapDrawable.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/RecyclingBitmapDrawable.java
new file mode 100644
index 0000000..5534a6a
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/RecyclingBitmapDrawable.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2013 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.example.android.displayingbitmaps.util;
+
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.drawable.BitmapDrawable;
+
+import com.example.android.common.logger.Log;
+import com.example.android.displayingbitmaps.BuildConfig;
+
+/**
+ * A BitmapDrawable that keeps track of whether it is being displayed or cached.
+ * When the drawable is no longer being displayed or cached,
+ * {@link android.graphics.Bitmap#recycle() recycle()} will be called on this drawable's bitmap.
+ */
+public class RecyclingBitmapDrawable extends BitmapDrawable {
+
+    static final String TAG = "CountingBitmapDrawable";
+
+    private int mCacheRefCount = 0;
+    private int mDisplayRefCount = 0;
+
+    private boolean mHasBeenDisplayed;
+
+    public RecyclingBitmapDrawable(Resources res, Bitmap bitmap) {
+        super(res, bitmap);
+    }
+
+    /**
+     * Notify the drawable that the displayed state has changed. Internally a
+     * count is kept so that the drawable knows when it is no longer being
+     * displayed.
+     *
+     * @param isDisplayed - Whether the drawable is being displayed or not
+     */
+    public void setIsDisplayed(boolean isDisplayed) {
+        //BEGIN_INCLUDE(set_is_displayed)
+        synchronized (this) {
+            if (isDisplayed) {
+                mDisplayRefCount++;
+                mHasBeenDisplayed = true;
+            } else {
+                mDisplayRefCount--;
+            }
+        }
+
+        // Check to see if recycle() can be called
+        checkState();
+        //END_INCLUDE(set_is_displayed)
+    }
+
+    /**
+     * Notify the drawable that the cache state has changed. Internally a count
+     * is kept so that the drawable knows when it is no longer being cached.
+     *
+     * @param isCached - Whether the drawable is being cached or not
+     */
+    public void setIsCached(boolean isCached) {
+        //BEGIN_INCLUDE(set_is_cached)
+        synchronized (this) {
+            if (isCached) {
+                mCacheRefCount++;
+            } else {
+                mCacheRefCount--;
+            }
+        }
+
+        // Check to see if recycle() can be called
+        checkState();
+        //END_INCLUDE(set_is_cached)
+    }
+
+    private synchronized void checkState() {
+        //BEGIN_INCLUDE(check_state)
+        // If the drawable cache and display ref counts = 0, and this drawable
+        // has been displayed, then recycle
+        if (mCacheRefCount <= 0 && mDisplayRefCount <= 0 && mHasBeenDisplayed
+                && hasValidBitmap()) {
+            if (BuildConfig.DEBUG) {
+                Log.d(TAG, "No longer being used or cached so recycling. "
+                        + toString());
+            }
+
+            getBitmap().recycle();
+        }
+        //END_INCLUDE(check_state)
+    }
+
+    private synchronized boolean hasValidBitmap() {
+        Bitmap bitmap = getBitmap();
+        return bitmap != null && !bitmap.isRecycled();
+    }
+
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/Utils.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/Utils.java
new file mode 100644
index 0000000..505d0ef
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/java/com/example/android/displayingbitmaps/util/Utils.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2012 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.example.android.displayingbitmaps.util;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.os.Build.VERSION_CODES;
+import android.os.StrictMode;
+
+import com.example.android.displayingbitmaps.ui.ImageDetailActivity;
+import com.example.android.displayingbitmaps.ui.ImageGridActivity;
+
+/**
+ * Class containing some static utility methods.
+ */
+public class Utils {
+    private Utils() {};
+
+
+    @TargetApi(VERSION_CODES.HONEYCOMB)
+    public static void enableStrictMode() {
+        if (Utils.hasGingerbread()) {
+            StrictMode.ThreadPolicy.Builder threadPolicyBuilder =
+                    new StrictMode.ThreadPolicy.Builder()
+                            .detectAll()
+                            .penaltyLog();
+            StrictMode.VmPolicy.Builder vmPolicyBuilder =
+                    new StrictMode.VmPolicy.Builder()
+                            .detectAll()
+                            .penaltyLog();
+
+            if (Utils.hasHoneycomb()) {
+                threadPolicyBuilder.penaltyFlashScreen();
+                vmPolicyBuilder
+                        .setClassInstanceLimit(ImageGridActivity.class, 1)
+                        .setClassInstanceLimit(ImageDetailActivity.class, 1);
+            }
+            StrictMode.setThreadPolicy(threadPolicyBuilder.build());
+            StrictMode.setVmPolicy(vmPolicyBuilder.build());
+        }
+    }
+
+    public static boolean hasFroyo() {
+        // Can use static final constants like FROYO, declared in later versions
+        // of the OS since they are inlined at compile time. This is guaranteed behavior.
+        return Build.VERSION.SDK_INT >= VERSION_CODES.FROYO;
+    }
+
+    public static boolean hasGingerbread() {
+        return Build.VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD;
+    }
+
+    public static boolean hasHoneycomb() {
+        return Build.VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB;
+    }
+
+    public static boolean hasHoneycombMR1() {
+        return Build.VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB_MR1;
+    }
+
+    public static boolean hasJellyBean() {
+        return Build.VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN;
+    }
+
+    public static boolean hasKitKat() {
+        return Build.VERSION.SDK_INT >= VERSION_CODES.KITKAT;
+    }
+}
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-hdpi/ic_launcher.png b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-hdpi/ic_launcher.png
new file mode 100644
index 0000000..75b3c97
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-hdpi/ic_launcher.png
Binary files differ
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-mdpi/ic_launcher.png b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-mdpi/ic_launcher.png
new file mode 100644
index 0000000..0c9c11a
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-mdpi/ic_launcher.png
Binary files differ
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-nodpi/empty_photo.png b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-nodpi/empty_photo.png
new file mode 100644
index 0000000..da1478a
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-nodpi/empty_photo.png
Binary files differ
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-xhdpi/ic_launcher.png b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-xhdpi/ic_launcher.png
new file mode 100644
index 0000000..7c5aeed
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-xhdpi/ic_launcher.png
Binary files differ
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-xxhdpi/ic_launcher.png b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-xxhdpi/ic_launcher.png
new file mode 100644
index 0000000..91b0f96
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable-xxhdpi/ic_launcher.png
Binary files differ
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable/photogrid_list_selector.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable/photogrid_list_selector.xml
new file mode 100644
index 0000000..d331c39
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/drawable/photogrid_list_selector.xml
@@ -0,0 +1,33 @@
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:state_pressed="true">
+        <shape>
+            <solid android:color="@color/grid_state_pressed" />
+        </shape>
+    </item>
+
+    <item android:state_focused="true">
+        <shape>
+            <solid android:color="@color/grid_state_focused" />
+        </shape>
+    </item>
+
+    <item android:drawable="@android:color/transparent" />
+
+</selector>
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_detail_fragment.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_detail_fragment.xml
new file mode 100644
index 0000000..97ac520
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_detail_fragment.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent" >
+
+    <ProgressBar
+        style="?android:attr/progressBarStyleLarge"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center" />
+
+    <com.example.android.displayingbitmaps.ui.RecyclingImageView
+        android:id="@+id/imageView"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:contentDescription="@string/imageview_description" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_detail_pager.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_detail_pager.xml
new file mode 100644
index 0000000..877a26b
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_detail_pager.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/pager"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent" >
+
+</android.support.v4.view.ViewPager>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_grid_fragment.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_grid_fragment.xml
new file mode 100644
index 0000000..e2034de
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/layout/image_grid_fragment.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<GridView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/gridView"
+    style="@style/PhotoGridLayout"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:columnWidth="@dimen/image_thumbnail_size"
+    android:horizontalSpacing="@dimen/image_thumbnail_spacing"
+    android:numColumns="auto_fit"
+    android:stretchMode="columnWidth"
+    android:verticalSpacing="@dimen/image_thumbnail_spacing" >
+
+</GridView>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/menu/main_menu.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/menu/main_menu.xml
new file mode 100644
index 0000000..35dad09
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/menu/main_menu.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+<menu xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <item
+        android:id="@+id/clear_cache"
+        android:icon="@android:drawable/ic_menu_delete"
+        android:showAsAction="never"
+        android:title="@string/clear_cache_menu"/>
+
+</menu>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-large/dimens.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-large/dimens.xml
new file mode 100644
index 0000000..c681876
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-large/dimens.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <dimen name="image_thumbnail_size">148dp</dimen>
+    <dimen name="image_thumbnail_spacing">2dp</dimen>
+
+</resources>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-v11/styles.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-v11/styles.xml
new file mode 100644
index 0000000..57da0fb
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-v11/styles.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <style name="AppThemeDark" parent="@android:style/Theme.Holo">
+        <item name="android:windowActionBarOverlay">true</item>
+        <item name="android:windowBackground">@android:color/black</item>
+        <item name="android:actionBarStyle">@style/TranslucentDarkActionBar</item>
+    </style>
+
+    <style name="AppThemeDark.FullScreen" />
+
+    <style name="TranslucentDarkActionBar" parent="@android:style/Widget.Holo.ActionBar">
+        <item name="android:background">#99000000</item>
+    </style>
+
+    <!--<style name="PhotoGridLayout">-->
+        <!--<item name="android:drawSelectorOnTop">true</item>-->
+    <!--</style>-->
+
+</resources>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-xlarge/dimens.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-xlarge/dimens.xml
new file mode 100644
index 0000000..0f43977
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values-xlarge/dimens.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <dimen name="image_thumbnail_size">198dp</dimen>
+    <dimen name="image_thumbnail_spacing">2dp</dimen>
+
+</resources>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/colors.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/colors.xml
new file mode 100644
index 0000000..521b4b9
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/colors.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <color name="grid_state_pressed">#1Affffff</color>
+    <color name="grid_state_focused">#80000000</color>
+
+</resources>
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/dimens.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..53f61f0
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/dimens.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <dimen name="image_thumbnail_size">100dp</dimen>
+    <dimen name="image_thumbnail_spacing">1dp</dimen>
+
+</resources>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/strings.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/strings.xml
new file mode 100644
index 0000000..84b6137
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/strings.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <string name="clear_cache_menu">Clear Caches</string>
+    <string name="clear_cache_complete_toast">Caches have been cleared</string>
+    <string name="imageview_description">Image Thumbnail</string>
+    <string name="no_network_connection_toast">No network connection found</string>
+
+</resources>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/styles.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/styles.xml
new file mode 100644
index 0000000..e9aabee
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/src/main/res/values/styles.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+
+<resources>
+
+    <style name="AppThemeDark" parent="android:Theme" />
+
+    <style name="AppThemeDark.FullScreen" parent="@android:style/Theme.Black.NoTitleBar.Fullscreen" />
+
+    <style name="PhotoGridLayout">
+        <item name="android:drawSelectorOnTop">true</item>
+        <item name="android:listSelector">@drawable/photogrid_list_selector</item>
+    </style>
+
+</resources>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/tests/AndroidManifest.xml b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/tests/AndroidManifest.xml
new file mode 100644
index 0000000..4ddcbbb
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/tests/AndroidManifest.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2013 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.
+-->
+
+
+
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2013 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 name must be unique so suffix with "tests" so package loader doesn't ignore us -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.example.android.displayingbitmaps.tests"
+          android:versionCode="1"
+          android:versionName="1.0">
+
+    <uses-sdk
+            android:minSdkVersion="18"
+            android:targetSdkVersion="19" />
+
+    <!-- We add an application tag here just so that we can indicate that
+         this package needs to link against the android.test library,
+         which is needed when building test cases. -->
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <!--
+    Specifies the instrumentation test runner used to run the tests.
+    -->
+    <instrumentation
+            android:name="android.test.InstrumentationTestRunner"
+            android:targetPackage="com.example.android.displayingbitmaps"
+            android:label="Tests for com.example.android.displayingbitmaps" />
+
+</manifest>
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/tests/src/com/example/android/displayingbitmaps/tests/SampleTests.java b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/tests/src/com/example/android/displayingbitmaps/tests/SampleTests.java
new file mode 100644
index 0000000..f295856
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/DisplayingBitmapsSample/tests/src/com/example/android/displayingbitmaps/tests/SampleTests.java
@@ -0,0 +1,79 @@
+/*
+* Copyright 2013 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.
+*/
+
+
+
+/*
+* Copyright (C) 2013 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.example.android.displayingbitmaps.tests;
+
+import com.example.android.displayingbitmaps.*;
+
+import android.test.ActivityInstrumentationTestCase2;
+
+/**
+* Tests for DisplayingBitmaps sample.
+*/
+public class SampleTests extends ActivityInstrumentationTestCase2<MainActivity> {
+
+    private MainActivity mTestActivity;
+    private DisplayingBitmapsFragment mTestFragment;
+
+    public SampleTests() {
+        super(MainActivity.class);
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+
+        // Starts the activity under test using the default Intent with:
+        // action = {@link Intent#ACTION_MAIN}
+        // flags = {@link Intent#FLAG_ACTIVITY_NEW_TASK}
+        // All other fields are null or empty.
+        mTestActivity = getActivity();
+        mTestFragment = (DisplayingBitmapsFragment)
+            mTestActivity.getSupportFragmentManager().getFragments().get(1);
+    }
+
+    /**
+    * Test if the test fixture has been set up correctly.
+    */
+    public void testPreconditions() {
+        //Try to add a message to add context to your assertions. These messages will be shown if
+        //a tests fails and make it easy to understand why a test failed
+        assertNotNull("mTestActivity is null", mTestActivity);
+        assertNotNull("mTestFragment is null", mTestFragment);
+    }
+
+    /**
+    * Add more tests below.
+    */
+
+}
\ No newline at end of file
diff --git a/ui/graphics/DisplayingBitmaps/build.gradle b/ui/graphics/DisplayingBitmaps/build.gradle
new file mode 100644
index 0000000..be1fa82
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/build.gradle
@@ -0,0 +1,14 @@
+
+
+
+
+// BEGIN_EXCLUDE
+import com.example.android.samples.build.SampleGenPlugin
+apply plugin: SampleGenPlugin
+
+samplegen {
+  pathToBuild "../../../../../build"
+  pathToSamplesCommon "../../../common"
+}
+apply from: "../../../../../build/build.gradle"
+// END_EXCLUDE
diff --git a/ui/graphics/DisplayingBitmaps/buildSrc/build.gradle b/ui/graphics/DisplayingBitmaps/buildSrc/build.gradle
new file mode 100644
index 0000000..e344a8c
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/buildSrc/build.gradle
@@ -0,0 +1,18 @@
+
+
+
+repositories {
+    mavenCentral()
+}
+dependencies {
+    compile 'org.freemarker:freemarker:2.3.20'
+}
+
+sourceSets {
+    main {
+        groovy {
+            srcDir new File(rootDir, "../../../../../../build/buildSrc/src/main/groovy")
+        }
+    }
+}
+
diff --git a/ui/graphics/DisplayingBitmaps/gradle/wrapper/gradle-wrapper.jar b/ui/graphics/DisplayingBitmaps/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..8c0fb64
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/gradle/wrapper/gradle-wrapper.jar
Binary files differ
diff --git a/ui/graphics/DisplayingBitmaps/gradle/wrapper/gradle-wrapper.properties b/ui/graphics/DisplayingBitmaps/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..56f685a
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Wed Apr 10 15:27:10 PDT 2013
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-bin.zip
diff --git a/ui/graphics/DisplayingBitmaps/gradlew b/ui/graphics/DisplayingBitmaps/gradlew
new file mode 100755
index 0000000..91a7e26
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/gradlew
@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched.
+if $cygwin ; then
+    [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+fi
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >&-
+APP_HOME="`pwd -P`"
+cd "$SAVED" >&-
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/ui/graphics/DisplayingBitmaps/gradlew.bat b/ui/graphics/DisplayingBitmaps/gradlew.bat
new file mode 100644
index 0000000..aec9973
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/ui/graphics/DisplayingBitmaps/settings.gradle b/ui/graphics/DisplayingBitmaps/settings.gradle
new file mode 100644
index 0000000..a5c5699
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/settings.gradle
@@ -0,0 +1,4 @@
+
+
+
+include 'DisplayingBitmapsSample'
diff --git a/ui/graphics/DisplayingBitmaps/template-params.xml b/ui/graphics/DisplayingBitmaps/template-params.xml
new file mode 100644
index 0000000..d09c839
--- /dev/null
+++ b/ui/graphics/DisplayingBitmaps/template-params.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2013 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.
+-->
+<sample>
+    <name>DisplayingBitmaps</name>
+    <group>UI</group>
+    <package>com.example.android.displayingbitmaps</package>
+
+    <!-- change minSdk if needed-->
+    <minSdk>7</minSdk>
+
+    <strings>
+        <intro>
+            <![CDATA[
+            This is a sample application for the Android Training class
+            &quot;Displaying Bitmaps Efficiently&quot;
+            (http://developer.android.com/training/displaying-bitmaps/).
+            It demonstrates how to load large bitmaps efficiently off the main UI thread, caching
+            bitmaps (both in memory and on disk), managing bitmap memory and displaying bitmaps
+            in UI elements such as ViewPager and ListView/GridView.
+            ]]>
+        </intro>
+    </strings>
+
+    <template src="base"/>
+    <common src="logger"/>
+
+</sample>