API demo for nesting fragments.

Change-Id: I7f20e4f00cf68c78c578ae620a95de7fa97f0761
diff --git a/samples/ApiDemos/AndroidManifest.xml b/samples/ApiDemos/AndroidManifest.xml
index 7326170..6d13ce6 100644
--- a/samples/ApiDemos/AndroidManifest.xml
+++ b/samples/ApiDemos/AndroidManifest.xml
@@ -358,6 +358,15 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".app.FragmentNestingTabs"
+                android:label="@string/fragment_nesting_tabs"
+                android:enabled="@bool/atLeastJellyBeanMR1">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".app.FragmentRetainInstance"
                 android:label="@string/fragment_retain_instance"
                 android:enabled="@bool/atLeastHoneycomb">
diff --git a/samples/ApiDemos/res/layout/fragment_arguments_fragment.xml b/samples/ApiDemos/res/layout/fragment_arguments_fragment.xml
new file mode 100644
index 0000000..b748239
--- /dev/null
+++ b/samples/ApiDemos/res/layout/fragment_arguments_fragment.xml
@@ -0,0 +1,50 @@
+<?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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:padding="4dip"
+    android:gravity="center_horizontal"
+    android:layout_width="match_parent" android:layout_height="match_parent">
+
+    <TextView
+            android:id="@+id/text"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="0"
+            android:padding="4dip"
+            android:layout_gravity="center_vertical|center_horizontal"
+            android:gravity="top|center_horizontal"
+            android:textAppearance="?android:attr/textAppearanceMedium"
+            android:text="@string/fragment_arguments_fragment_msg" />
+
+    <LinearLayout android:orientation="horizontal" android:padding="4dip"
+        android:layout_width="match_parent" android:layout_height="wrap_content">
+
+    <FrameLayout
+            android:id="@+id/created1"
+            android:layout_width="0px"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+    <FrameLayout
+            android:id="@+id/created2"
+            android:layout_width="0px"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+    </LinearLayout>
+
+</LinearLayout>
diff --git a/samples/ApiDemos/res/layout/fragment_pager_support.xml b/samples/ApiDemos/res/layout/fragment_pager_support.xml
deleted file mode 100644
index a082e2e..0000000
--- a/samples/ApiDemos/res/layout/fragment_pager_support.xml
+++ /dev/null
@@ -1,44 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2010 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.
--->
-
-<!-- Top-level content view for the simple fragment sample. -->
-
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-        android:orientation="vertical" android:padding="4dip"
-        android:gravity="center_horizontal"
-        android:layout_width="match_parent" android:layout_height="match_parent">
-
-    <android.support.v4.app.FragmentPager
-            android:id="@+id/pager"
-            android:layout_width="match_parent"
-            android:layout_height="0px"
-            android:layout_weight="1">
-    </android.support.v4.app.FragmentPager>
-
-    <LinearLayout android:orientation="horizontal"
-            android:gravity="center" android:measureWithLargestChild="true"
-            android:layout_width="match_parent" android:layout_height="wrap_content"
-            android:layout_weight="0">
-        <Button android:id="@+id/goto_first"
-            android:layout_width="wrap_content" android:layout_height="wrap_content"
-            android:text="@string/first">
-        </Button>
-        <Button android:id="@+id/goto_last"
-            android:layout_width="wrap_content" android:layout_height="wrap_content"
-            android:text="@string/last">
-        </Button>
-    </LinearLayout>
-</LinearLayout>
diff --git a/samples/ApiDemos/res/layout/fragment_pager_support_list.xml b/samples/ApiDemos/res/layout/fragment_pager_support_list.xml
deleted file mode 100644
index bbe7b1d..0000000
--- a/samples/ApiDemos/res/layout/fragment_pager_support_list.xml
+++ /dev/null
@@ -1,52 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- 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.
--->
-
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="@android:drawable/gallery_thumb">
-
-    <TextView android:id="@+id/text"
-        android:layout_width="match_parent" android:layout_height="wrap_content"
-        android:gravity="center_vertical|center_horizontal"
-        android:textAppearance="?android:attr/textAppearanceMedium"
-        android:text="@string/hello_world"/>
-
-    <!-- The frame layout is here since we will be showing either
-    the empty view or the list view.  -->
-    <FrameLayout
-        android:layout_width="match_parent"
-        android:layout_height="0dip"
-        android:layout_weight="1" >
-        <!-- Here is the list. Since we are using a ListActivity, we
-             have to call it "@android:id/list" so ListActivity will
-             find it -->
-        <ListView android:id="@android:id/list"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:drawSelectorOnTop="false"/>
-
-        <!-- Here is the view to show if the list is emtpy -->
-        <TextView android:id="@android:id/empty"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:textAppearance="?android:attr/textAppearanceMedium"
-            android:text="No items."/>
-
-    </FrameLayout>
-
-</LinearLayout>
diff --git a/samples/ApiDemos/res/layout/fragment_stack.xml b/samples/ApiDemos/res/layout/fragment_stack.xml
index 1d12496..6cf2fe6 100644
--- a/samples/ApiDemos/res/layout/fragment_stack.xml
+++ b/samples/ApiDemos/res/layout/fragment_stack.xml
@@ -28,11 +28,19 @@
             android:layout_weight="1">
     </FrameLayout>
 
-    <Button android:id="@+id/new_fragment"
+    <LinearLayout android:orientation="horizontal" android:padding="4dip"
+        android:gravity="center_horizontal" android:measureWithLargestChild="true"
         android:layout_width="wrap_content" android:layout_height="wrap_content"
-        android:layout_weight="0" 
-        android:text="@string/new_fragment">
-        <requestFocus />
-    </Button>
-
+        android:layout_weight="0">
+        <Button android:id="@+id/new_fragment"
+            android:layout_width="wrap_content" android:layout_height="wrap_content"
+            android:text="@string/new_fragment">
+            <requestFocus />
+        </Button>
+        <Button android:id="@+id/delete_fragment"
+            android:layout_width="wrap_content" android:layout_height="wrap_content"
+            android:layout_weight="0" 
+            android:text="@string/delete_fragment">
+        </Button>
+    </LinearLayout>
 </LinearLayout>
diff --git a/samples/ApiDemos/res/layout/fragment_tabs_fragment.xml b/samples/ApiDemos/res/layout/fragment_tabs_fragment.xml
new file mode 100644
index 0000000..89b2757
--- /dev/null
+++ b/samples/ApiDemos/res/layout/fragment_tabs_fragment.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/* Copyright 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.
+*/
+-->
+
+<TabHost
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@android:id/tabhost"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TabWidget
+            android:id="@android:id/tabs"
+            android:orientation="horizontal"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="0"/>
+
+        <FrameLayout
+            android:id="@android:id/tabcontent"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_weight="0"/>
+
+        <FrameLayout
+            android:id="@+android:id/realtabcontent"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"/>
+
+    </LinearLayout>
+</TabHost>
diff --git a/samples/ApiDemos/res/values-v17/bools.xml b/samples/ApiDemos/res/values-v17/bools.xml
new file mode 100644
index 0000000..41bb2c3
--- /dev/null
+++ b/samples/ApiDemos/res/values-v17/bools.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+
+<resources>
+    <!-- True if running under JellyBean MR1 or later. -->
+    <bool name="atLeastJellyBeanMR1">true</bool>
+</resources>
diff --git a/samples/ApiDemos/res/values/bools.xml b/samples/ApiDemos/res/values/bools.xml
index c112fb4..38c602e 100644
--- a/samples/ApiDemos/res/values/bools.xml
+++ b/samples/ApiDemos/res/values/bools.xml
@@ -34,4 +34,9 @@
          for JellyBean is true. -->
     <bool name="atLeastJellyBean">false</bool>
 
+    <!-- This resource is true if running under at least JellyBean MR1
+         API level.  The default value is false; an alternative value
+         for JellyBean MR 1 is true. -->
+    <bool name="atLeastJellyBeanMR1">false</bool>
+    
 </resources>
diff --git a/samples/ApiDemos/res/values/strings.xml b/samples/ApiDemos/res/values/strings.xml
index 778beca..64fc5ff 100644
--- a/samples/ApiDemos/res/values/strings.xml
+++ b/samples/ApiDemos/res/values/strings.xml
@@ -124,6 +124,9 @@
     <string name="fragment_arguments_embedded">From Attributes</string>
     <string name="fragment_arguments_embedded_land">Landscape Only</string>
 
+    <string name="fragment_arguments_fragment_msg">Demonstrates two embedded fragments
+        that are instantiated with arguments.</string>
+
     <string name="fragment_custom_animations">App/Fragment/Custom Animations</string>
 
     <string name="fragment_hide_show">App/Fragment/Hide and Show</string>
@@ -152,6 +155,8 @@
     <string name="fragment1menu">Show fragment 1 menu</string>
     <string name="fragment2menu">Show fragment 2 menu</string>
 
+    <string name="fragment_nesting_tabs">App/Fragment/Nesting Tabs</string>
+
     <string name="fragment_retain_instance">App/Fragment/Retain Instance</string>
     <string name="fragment_retain_instance_msg">Current progress of retained fragment;
     restarts if fragment is re-created.</string>
@@ -160,8 +165,9 @@
     <string name="fragment_receive_result">App/Fragment/Receive Result</string>
 
     <string name="fragment_stack">App/Fragment/Stack</string>
-    <string name="new_fragment">New fragment</string>
-
+    <string name="new_fragment">Push</string>
+    <string name="delete_fragment">Pop</string>
+    
     <string name="first">First</string>
     <string name="last">Last</string>
 
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentArgumentsFragment.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentArgumentsFragment.java
new file mode 100644
index 0000000..7023c43
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentArgumentsFragment.java
@@ -0,0 +1,53 @@
+/*
+ * 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.apis.app;
+
+import com.example.android.apis.R;
+
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * Demonstrates a fragment that can be configured through both Bundle arguments
+ * and layout attributes.
+ */
+public class FragmentArgumentsFragment extends Fragment {
+    @Override public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (savedInstanceState == null) {
+            // First-time init; create fragment to embed in activity.
+            FragmentTransaction ft = getChildFragmentManager().beginTransaction();
+            Fragment newFragment = FragmentArguments.MyFragment.newInstance("From Arguments 1");
+            ft.add(R.id.created1, newFragment);
+            newFragment = FragmentArguments.MyFragment.newInstance("From Arguments 2");
+            ft.add(R.id.created2, newFragment);
+            ft.commit();
+        }
+    }
+
+    @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        View v = inflater.inflate(R.layout.fragment_arguments_fragment, container, false);
+        return v;
+    }
+//END_INCLUDE(create)
+}
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentContextMenu.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentContextMenu.java
index 6bc73e0..420e67f 100644
--- a/samples/ApiDemos/src/com/example/android/apis/app/FragmentContextMenu.java
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentContextMenu.java
@@ -29,6 +29,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ContextMenu.ContextMenuInfo;
+import android.widget.Toast;
 
 /**
  * Demonstration of displaying a context menu from a fragment.
@@ -65,10 +66,10 @@
         public boolean onContextItemSelected(MenuItem item) {
             switch (item.getItemId()) {
                 case R.id.a_item:
-                    Log.i("ContextMenu", "Item 1a was chosen");
+                    Toast.makeText(getActivity(), "Item 1a was chosen", Toast.LENGTH_SHORT).show();
                     return true;
                 case R.id.b_item:
-                    Log.i("ContextMenu", "Item 1b was chosen");
+                    Toast.makeText(getActivity(), "Item 1b was chosen", Toast.LENGTH_SHORT).show();
                     return true;
             }
             return super.onContextItemSelected(item);
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentMenuFragment.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentMenuFragment.java
new file mode 100644
index 0000000..6ac7003
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentMenuFragment.java
@@ -0,0 +1,95 @@
+/*
+ * 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.apis.app;
+
+import com.example.android.apis.R;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.app.FragmentTransaction;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.CheckBox;
+
+/**
+ * Demonstrates how fragments can participate in the options menu.
+ */
+public class FragmentMenuFragment extends Fragment {
+    Fragment mFragment1;
+    Fragment mFragment2;
+    CheckBox mCheckBox1;
+    CheckBox mCheckBox2;
+
+    // Update fragment visibility when check boxes are changed.
+    final OnClickListener mClickListener = new OnClickListener() {
+        public void onClick(View v) {
+            updateFragmentVisibility();
+        }
+    };
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        View v = inflater.inflate(R.layout.fragment_menu, container, false);
+
+        // Make sure the two menu fragments are created.
+        FragmentManager fm = getChildFragmentManager();
+        FragmentTransaction ft = fm.beginTransaction();
+        mFragment1 = fm.findFragmentByTag("f1");
+        if (mFragment1 == null) {
+            mFragment1 = new FragmentMenu.MenuFragment();
+            ft.add(mFragment1, "f1");
+        }
+        mFragment2 = fm.findFragmentByTag("f2");
+        if (mFragment2 == null) {
+            mFragment2 = new FragmentMenu.Menu2Fragment();
+            ft.add(mFragment2, "f2");
+        }
+        ft.commit();
+        
+        // Watch check box clicks.
+        mCheckBox1 = (CheckBox)v.findViewById(R.id.menu1);
+        mCheckBox1.setOnClickListener(mClickListener);
+        mCheckBox2 = (CheckBox)v.findViewById(R.id.menu2);
+        mCheckBox2.setOnClickListener(mClickListener);
+        
+        // Make sure fragments start out with correct visibility.
+        updateFragmentVisibility();
+
+        return v;
+    }
+
+    @Override
+    public void onViewStateRestored(Bundle savedInstanceState) {
+        super.onViewStateRestored(savedInstanceState);
+        // Make sure fragments are updated after check box view state is restored.
+        updateFragmentVisibility();
+    }
+
+    // Update fragment visibility based on current check box state.
+    void updateFragmentVisibility() {
+        FragmentTransaction ft = getChildFragmentManager().beginTransaction();
+        if (mCheckBox1.isChecked()) ft.show(mFragment1);
+        else ft.hide(mFragment1);
+        if (mCheckBox2.isChecked()) ft.show(mFragment2);
+        else ft.hide(mFragment2);
+        ft.commit();
+    }
+}
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentNestingTabs.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentNestingTabs.java
new file mode 100644
index 0000000..e357612
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentNestingTabs.java
@@ -0,0 +1,116 @@
+/*
+ * 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.apis.app;
+
+//BEGIN_INCLUDE(complete)
+import android.app.ActionBar;
+import android.app.ActionBar.Tab;
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.os.Bundle;
+import android.widget.Toast;
+
+/**
+ * This demonstrates the use of action bar tabs and how they interact
+ * with other action bar features.
+ */
+public class FragmentNestingTabs extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final ActionBar bar = getActionBar();
+        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
+        bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
+
+        bar.addTab(bar.newTab()
+                .setText("Menus")
+                .setTabListener(new TabListener<FragmentMenuFragment>(
+                        this, "menus", FragmentMenuFragment.class)));
+        bar.addTab(bar.newTab()
+                .setText("Args")
+                .setTabListener(new TabListener<FragmentArgumentsFragment>(
+                        this, "args", FragmentArgumentsFragment.class)));
+        bar.addTab(bar.newTab()
+                .setText("Stack")
+                .setTabListener(new TabListener<FragmentStackFragment>(
+                        this, "stack", FragmentStackFragment.class)));
+        bar.addTab(bar.newTab()
+                .setText("Tabs")
+                .setTabListener(new TabListener<FragmentTabsFragment>(
+                        this, "tabs", FragmentTabsFragment.class)));
+
+        if (savedInstanceState != null) {
+            bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
+        }
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
+    }
+
+    public static class TabListener<T extends Fragment> implements ActionBar.TabListener {
+        private final Activity mActivity;
+        private final String mTag;
+        private final Class<T> mClass;
+        private final Bundle mArgs;
+        private Fragment mFragment;
+
+        public TabListener(Activity activity, String tag, Class<T> clz) {
+            this(activity, tag, clz, null);
+        }
+
+        public TabListener(Activity activity, String tag, Class<T> clz, Bundle args) {
+            mActivity = activity;
+            mTag = tag;
+            mClass = clz;
+            mArgs = args;
+
+            // Check to see if we already have a fragment for this tab, probably
+            // from a previously saved state.  If so, deactivate it, because our
+            // initial state is that a tab isn't shown.
+            mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
+            if (mFragment != null && !mFragment.isDetached()) {
+                FragmentTransaction ft = mActivity.getFragmentManager().beginTransaction();
+                ft.detach(mFragment);
+                ft.commit();
+            }
+        }
+
+        public void onTabSelected(Tab tab, FragmentTransaction ft) {
+            if (mFragment == null) {
+                mFragment = Fragment.instantiate(mActivity, mClass.getName(), mArgs);
+                ft.add(android.R.id.content, mFragment, mTag);
+            } else {
+                ft.attach(mFragment);
+            }
+        }
+
+        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
+            if (mFragment != null) {
+                ft.detach(mFragment);
+            }
+        }
+
+        public void onTabReselected(Tab tab, FragmentTransaction ft) {
+            Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT).show();
+        }
+    }
+}
+//END_INCLUDE(complete)
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java
index 891eda4..242d670 100644
--- a/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java
@@ -44,6 +44,12 @@
                 addFragmentToStack();
             }
         });
+        button = (Button)findViewById(R.id.delete_fragment);
+        button.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                getFragmentManager().popBackStack();
+            }
+        });
 
         if (savedInstanceState == null) {
             // Do first time initialization -- add initial fragment.
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentStackFragment.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentStackFragment.java
new file mode 100644
index 0000000..d33af64
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentStackFragment.java
@@ -0,0 +1,89 @@
+/*
+ * 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.apis.app;
+
+import com.example.android.apis.R;
+
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+
+public class FragmentStackFragment extends Fragment {
+    int mStackLevel = 1;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (savedInstanceState == null) {
+            // Do first time initialization -- add initial fragment.
+            Fragment newFragment = FragmentStack.CountingFragment.newInstance(mStackLevel);
+            FragmentTransaction ft = getChildFragmentManager().beginTransaction();
+            ft.add(R.id.simple_fragment, newFragment).commit();
+        } else {
+            mStackLevel = savedInstanceState.getInt("level");
+        }
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        View v = inflater.inflate(R.layout.fragment_stack, container, false);
+
+        // Watch for button clicks.
+        Button button = (Button)v.findViewById(R.id.new_fragment);
+        button.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                addFragmentToStack();
+            }
+        });
+        button = (Button)v.findViewById(R.id.delete_fragment);
+        button.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                getChildFragmentManager().popBackStack();
+            }
+        });
+
+        return v;
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putInt("level", mStackLevel);
+    }
+
+    void addFragmentToStack() {
+        mStackLevel++;
+
+        // Instantiate a new fragment.
+        Fragment newFragment = FragmentStack.CountingFragment.newInstance(mStackLevel);
+
+        // Add the fragment to the activity, pushing this transaction
+        // on to the back stack.
+        FragmentTransaction ft = getChildFragmentManager().beginTransaction();
+        ft.replace(R.id.simple_fragment, newFragment);
+        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
+        ft.addToBackStack(null);
+        ft.commit();
+    }
+}
diff --git a/samples/ApiDemos/src/com/example/android/apis/app/FragmentTabsFragment.java b/samples/ApiDemos/src/com/example/android/apis/app/FragmentTabsFragment.java
new file mode 100644
index 0000000..f1d8592
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/app/FragmentTabsFragment.java
@@ -0,0 +1,189 @@
+/*
+ * 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.apis.app;
+
+import java.util.HashMap;
+
+import com.example.android.apis.R;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.app.FragmentTransaction;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TabHost;
+
+public class FragmentTabsFragment extends Fragment {
+    TabHost mTabHost;
+    TabManager mTabManager;
+    String mCurrentTabTag;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        View v = inflater.inflate(R.layout.fragment_tabs_fragment, container, false);
+        mTabHost = (TabHost)v.findViewById(android.R.id.tabhost);
+        mTabHost.setup();
+
+        mTabManager = new TabManager(getActivity(), getChildFragmentManager(),
+                mTabHost, R.id.realtabcontent);
+
+        mTabManager.addTab(mTabHost.newTabSpec("result").setIndicator("Result"),
+                FragmentReceiveResult.ReceiveResultFragment.class, null);
+        mTabManager.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"),
+                LoaderCursor.CursorLoaderListFragment.class, null);
+        mTabManager.addTab(mTabHost.newTabSpec("apps").setIndicator("Apps"),
+                LoaderCustom.AppListFragment.class, null);
+        mTabManager.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"),
+                LoaderThrottle.ThrottledLoaderListFragment.class, null);
+
+        return v;
+    }
+
+    @Override
+    public void onViewStateRestored(Bundle savedInstanceState) {
+        super.onViewStateRestored(savedInstanceState);
+        if (savedInstanceState != null) {
+            mCurrentTabTag = savedInstanceState.getString("tab");
+        }
+        mTabHost.setCurrentTabByTag(mCurrentTabTag);
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        // Need to remember the selected tab so that we can restore it if
+        // we later re-create the views.
+        mCurrentTabTag = mTabHost.getCurrentTabTag();
+        mTabHost = null;
+        mTabManager = null;
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putString("tab", mTabHost != null
+                ? mTabHost.getCurrentTabTag() : mCurrentTabTag);
+    }
+
+    /**
+     * This is a helper class that implements a generic mechanism for
+     * associating fragments with the tabs in a tab host.  It relies on a
+     * trick.  Normally a tab host has a simple API for supplying a View or
+     * Intent that each tab will show.  This is not sufficient for switching
+     * between fragments.  So instead we make the content part of the tab host
+     * 0dp high (it is not shown) and the TabManager supplies its own dummy
+     * view to show as the tab content.  It listens to changes in tabs, and takes
+     * care of switch to the correct fragment shown in a separate content area
+     * whenever the selected tab changes.
+     */
+    public static class TabManager implements TabHost.OnTabChangeListener {
+        private final Context mContext;
+        private final FragmentManager mManager;
+        private final TabHost mTabHost;
+        private final int mContainerId;
+        private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
+        TabInfo mLastTab;
+
+        static final class TabInfo {
+            private final String tag;
+            private final Class<?> clss;
+            private final Bundle args;
+            private Fragment fragment;
+
+            TabInfo(String _tag, Class<?> _class, Bundle _args) {
+                tag = _tag;
+                clss = _class;
+                args = _args;
+            }
+        }
+
+        static class DummyTabFactory implements TabHost.TabContentFactory {
+            private final Context mContext;
+
+            public DummyTabFactory(Context context) {
+                mContext = context;
+            }
+
+            @Override
+            public View createTabContent(String tag) {
+                View v = new View(mContext);
+                v.setMinimumWidth(0);
+                v.setMinimumHeight(0);
+                return v;
+            }
+        }
+
+        public TabManager(Context context, FragmentManager manager, TabHost tabHost,
+                int containerId) {
+            mContext = context;
+            mManager = manager;
+            mTabHost = tabHost;
+            mContainerId = containerId;
+            mTabHost.setOnTabChangedListener(this);
+        }
+
+        public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
+            tabSpec.setContent(new DummyTabFactory(mContext));
+            String tag = tabSpec.getTag();
+
+            TabInfo info = new TabInfo(tag, clss, args);
+
+            // Check to see if we already have a fragment for this tab, probably
+            // from a previously saved state.  If so, deactivate it, because our
+            // initial state is that a tab isn't shown.
+            info.fragment = mManager.findFragmentByTag(tag);
+            if (info.fragment != null && !info.fragment.isDetached()) {
+                FragmentTransaction ft = mManager.beginTransaction();
+                ft.detach(info.fragment);
+                ft.commit();
+            }
+
+            mTabs.put(tag, info);
+            mTabHost.addTab(tabSpec);
+        }
+
+        @Override
+        public void onTabChanged(String tabId) {
+            TabInfo newTab = mTabs.get(tabId);
+            if (mLastTab != newTab) {
+                FragmentTransaction ft = mManager.beginTransaction();
+                if (mLastTab != null) {
+                    if (mLastTab.fragment != null) {
+                        ft.detach(mLastTab.fragment);
+                    }
+                }
+                if (newTab != null) {
+                    if (newTab.fragment == null) {
+                        newTab.fragment = Fragment.instantiate(mContext,
+                                newTab.clss.getName(), newTab.args);
+                        ft.add(mContainerId, newTab.fragment, newTab.tag);
+                    } else {
+                        ft.attach(newTab.fragment);
+                    }
+                }
+
+                mLastTab = newTab;
+                ft.commit();
+                mManager.executePendingTransactions();
+            }
+        }
+    }
+}
+//END_INCLUDE(complete)
diff --git a/samples/Support13Demos/AndroidManifest.xml b/samples/Support13Demos/AndroidManifest.xml
index bc32d09..dfa4e64 100644
--- a/samples/Support13Demos/AndroidManifest.xml
+++ b/samples/Support13Demos/AndroidManifest.xml
@@ -47,6 +47,22 @@
 
         <!-- Fragment Support Samples -->
 
+        <activity android:name=".app.FragmentNestingPagerSupport"
+                android:label="@string/fragment_nesting_pager_support">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="com.example.android.supportv13.SUPPORT13_SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
+        <activity android:name=".app.FragmentNestingStatePagerSupport"
+                android:label="@string/fragment_nesting_state_pager_support">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="com.example.android.supportv13.SUPPORT13_SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".app.FragmentPagerSupport"
                 android:label="@string/fragment_pager_support">
             <intent-filter>
diff --git a/samples/Support13Demos/res/layout/counting.xml b/samples/Support13Demos/res/layout/counting.xml
new file mode 100644
index 0000000..7d37c37
--- /dev/null
+++ b/samples/Support13Demos/res/layout/counting.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2007 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.
+-->
+
+<!-- Demonstrates basic application screen.
+     See corresponding Java code com.android.sdk.app.HelloWorld.java. -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:drawable/gallery_thumb">
+    <TextView android:id="@+id/text"
+        android:layout_width="match_parent" android:layout_height="wrap_content"
+        android:gravity="center_vertical|center_horizontal"
+        android:textAppearance="?android:attr/textAppearanceMedium"
+        android:text="@string/hello_world"/>
+    <CheckBox android:id="@+id/menu1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:checked="true"
+        android:text="@string/retained">
+    </CheckBox>
+</LinearLayout>
diff --git a/samples/Support13Demos/res/layout/fragment_tabs_fragment.xml b/samples/Support13Demos/res/layout/fragment_tabs_fragment.xml
new file mode 100644
index 0000000..89b2757
--- /dev/null
+++ b/samples/Support13Demos/res/layout/fragment_tabs_fragment.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/* Copyright 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.
+*/
+-->
+
+<TabHost
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@android:id/tabhost"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TabWidget
+            android:id="@android:id/tabs"
+            android:orientation="horizontal"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="0"/>
+
+        <FrameLayout
+            android:id="@android:id/tabcontent"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_weight="0"/>
+
+        <FrameLayout
+            android:id="@+android:id/realtabcontent"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"/>
+
+    </LinearLayout>
+</TabHost>
diff --git a/samples/Support13Demos/res/layout/hello_world.xml b/samples/Support13Demos/res/layout/hello_world.xml
deleted file mode 100644
index 433ea9b..0000000
--- a/samples/Support13Demos/res/layout/hello_world.xml
+++ /dev/null
@@ -1,26 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2007 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.
--->
-
-<!-- Demonstrates basic application screen.
-     See corresponding Java code com.android.sdk.app.HelloWorld.java. -->
-
-<!-- This screen consists of a single text field that
-     displays our "Hello, World!" text. -->
-<TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text"
-    android:layout_width="match_parent" android:layout_height="match_parent"
-    android:gravity="center_vertical|center_horizontal"
-    android:textAppearance="?android:attr/textAppearanceMedium"
-    android:text="@string/hello_world"/>
diff --git a/samples/Support13Demos/res/values/strings.xml b/samples/Support13Demos/res/values/strings.xml
index 2fd12d4..92316d0 100644
--- a/samples/Support13Demos/res/values/strings.xml
+++ b/samples/Support13Demos/res/values/strings.xml
@@ -18,11 +18,17 @@
     <string name="activity_sample_code">Support v13 Demos</string>
 
     <string name="hello_world"><b>Hello, <i>World!</i></b></string>
+    <string name="retained">Retained state</string>
+
     <string name="alert_dialog_two_buttons_title">
         Lorem ipsum dolor sit aie consectetur adipiscing\nPlloaso mako nuto
         siwuf cakso dodtos anr koop.
     </string>
 
+    <string name="fragment_nesting_pager_support">Fragment/Nesting Pager</string>
+
+    <string name="fragment_nesting_state_pager_support">Fragment/Nesting State Pager</string>
+
     <string name="fragment_pager_support">Fragment/Pager</string>
     <string name="first">First</string>
     <string name="last">Last</string>
diff --git a/samples/Support13Demos/src/com/example/android/supportv13/app/CountingFragment.java b/samples/Support13Demos/src/com/example/android/supportv13/app/CountingFragment.java
index 8672ed2..d52955b 100644
--- a/samples/Support13Demos/src/com/example/android/supportv13/app/CountingFragment.java
+++ b/samples/Support13Demos/src/com/example/android/supportv13/app/CountingFragment.java
@@ -58,10 +58,9 @@
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
-        View v = inflater.inflate(R.layout.hello_world, container, false);
+        View v = inflater.inflate(R.layout.counting, container, false);
         View tv = v.findViewById(R.id.text);
         ((TextView)tv).setText("Fragment #" + mNum);
-        tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb));
         return v;
     }
 }
diff --git a/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentNestingPagerSupport.java b/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentNestingPagerSupport.java
new file mode 100644
index 0000000..0a88a05
--- /dev/null
+++ b/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentNestingPagerSupport.java
@@ -0,0 +1,159 @@
+/*
+ * 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.supportv13.app;
+
+import java.util.ArrayList;
+
+import com.example.android.supportv13.R;
+
+import android.app.ActionBar;
+import android.app.ActionBar.Tab;
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v13.app.FragmentPagerAdapter;
+import android.support.v4.view.ViewPager;
+
+//BEGIN_INCLUDE(complete)
+public class FragmentNestingPagerSupport extends Activity {
+    ViewPager mViewPager;
+    TabsAdapter mTabsAdapter;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mViewPager = new ViewPager(this);
+        mViewPager.setId(R.id.pager);
+        setContentView(mViewPager);
+
+        final ActionBar bar = getActionBar();
+        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
+        bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
+
+        mTabsAdapter = new TabsAdapter(this, mViewPager);
+        mTabsAdapter.addTab(bar.newTab().setText("Simple"),
+                CountingFragment.class, null);
+        mTabsAdapter.addTab(bar.newTab().setText("List"),
+                FragmentPagerSupport.ArrayListFragment.class, null);
+        mTabsAdapter.addTab(bar.newTab().setText("Cursor"),
+                CursorFragment.class, null);
+        mTabsAdapter.addTab(bar.newTab().setText("Tabs"),
+                FragmentTabsFragment.class, null);
+
+        if (savedInstanceState != null) {
+            bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
+        }
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
+    }
+
+    /**
+     * This is a helper class that implements the management of tabs and all
+     * details of connecting a ViewPager with associated TabHost.  It relies on a
+     * trick.  Normally a tab host has a simple API for supplying a View or
+     * Intent that each tab will show.  This is not sufficient for switching
+     * between pages.  So instead we make the content part of the tab host
+     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
+     * view to show as the tab content.  It listens to changes in tabs, and takes
+     * care of switch to the correct paged in the ViewPager whenever the selected
+     * tab changes.
+     */
+    public static class TabsAdapter extends FragmentPagerAdapter
+            implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
+        private final Context mContext;
+        private final ActionBar mActionBar;
+        private final ViewPager mViewPager;
+        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
+
+        static final class TabInfo {
+            private final Class<?> clss;
+            private final Bundle args;
+
+            TabInfo(Class<?> _class, Bundle _args) {
+                clss = _class;
+                args = _args;
+            }
+        }
+
+        public TabsAdapter(Activity activity, ViewPager pager) {
+            super(activity.getFragmentManager());
+            mContext = activity;
+            mActionBar = activity.getActionBar();
+            mViewPager = pager;
+            mViewPager.setAdapter(this);
+            mViewPager.setOnPageChangeListener(this);
+        }
+
+        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
+            TabInfo info = new TabInfo(clss, args);
+            tab.setTag(info);
+            tab.setTabListener(this);
+            mTabs.add(info);
+            mActionBar.addTab(tab);
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public int getCount() {
+            return mTabs.size();
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            TabInfo info = mTabs.get(position);
+            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
+        }
+
+        @Override
+        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        }
+
+        @Override
+        public void onPageSelected(int position) {
+            mActionBar.setSelectedNavigationItem(position);
+        }
+
+        @Override
+        public void onPageScrollStateChanged(int state) {
+        }
+
+        @Override
+        public void onTabSelected(Tab tab, FragmentTransaction ft) {
+            Object tag = tab.getTag();
+            for (int i=0; i<mTabs.size(); i++) {
+                if (mTabs.get(i) == tag) {
+                    mViewPager.setCurrentItem(i);
+                }
+            }
+        }
+
+        @Override
+        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
+        }
+
+        @Override
+        public void onTabReselected(Tab tab, FragmentTransaction ft) {
+        }
+    }
+}
+//END_INCLUDE(complete)
diff --git a/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentNestingStatePagerSupport.java b/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentNestingStatePagerSupport.java
new file mode 100644
index 0000000..5863852
--- /dev/null
+++ b/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentNestingStatePagerSupport.java
@@ -0,0 +1,159 @@
+/*
+ * 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.supportv13.app;
+
+import java.util.ArrayList;
+
+import com.example.android.supportv13.R;
+
+import android.app.ActionBar;
+import android.app.ActionBar.Tab;
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v13.app.FragmentStatePagerAdapter;
+import android.support.v4.view.ViewPager;
+
+//BEGIN_INCLUDE(complete)
+public class FragmentNestingStatePagerSupport extends Activity {
+    ViewPager mViewPager;
+    TabsAdapter mTabsAdapter;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mViewPager = new ViewPager(this);
+        mViewPager.setId(R.id.pager);
+        setContentView(mViewPager);
+
+        final ActionBar bar = getActionBar();
+        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
+        bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
+
+        mTabsAdapter = new TabsAdapter(this, mViewPager);
+        mTabsAdapter.addTab(bar.newTab().setText("Simple"),
+                CountingFragment.class, null);
+        mTabsAdapter.addTab(bar.newTab().setText("List"),
+                FragmentPagerSupport.ArrayListFragment.class, null);
+        mTabsAdapter.addTab(bar.newTab().setText("Cursor"),
+                CursorFragment.class, null);
+        mTabsAdapter.addTab(bar.newTab().setText("Tabs"),
+                FragmentTabsFragment.class, null);
+
+        if (savedInstanceState != null) {
+            bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
+        }
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
+    }
+
+    /**
+     * This is a helper class that implements the management of tabs and all
+     * details of connecting a ViewPager with associated TabHost.  It relies on a
+     * trick.  Normally a tab host has a simple API for supplying a View or
+     * Intent that each tab will show.  This is not sufficient for switching
+     * between pages.  So instead we make the content part of the tab host
+     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
+     * view to show as the tab content.  It listens to changes in tabs, and takes
+     * care of switch to the correct paged in the ViewPager whenever the selected
+     * tab changes.
+     */
+    public static class TabsAdapter extends FragmentStatePagerAdapter
+            implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
+        private final Context mContext;
+        private final ActionBar mActionBar;
+        private final ViewPager mViewPager;
+        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
+
+        static final class TabInfo {
+            private final Class<?> clss;
+            private final Bundle args;
+
+            TabInfo(Class<?> _class, Bundle _args) {
+                clss = _class;
+                args = _args;
+            }
+        }
+
+        public TabsAdapter(Activity activity, ViewPager pager) {
+            super(activity.getFragmentManager());
+            mContext = activity;
+            mActionBar = activity.getActionBar();
+            mViewPager = pager;
+            mViewPager.setAdapter(this);
+            mViewPager.setOnPageChangeListener(this);
+        }
+
+        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
+            TabInfo info = new TabInfo(clss, args);
+            tab.setTag(info);
+            tab.setTabListener(this);
+            mTabs.add(info);
+            mActionBar.addTab(tab);
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public int getCount() {
+            return mTabs.size();
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            TabInfo info = mTabs.get(position);
+            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
+        }
+
+        @Override
+        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        }
+
+        @Override
+        public void onPageSelected(int position) {
+            mActionBar.setSelectedNavigationItem(position);
+        }
+
+        @Override
+        public void onPageScrollStateChanged(int state) {
+        }
+
+        @Override
+        public void onTabSelected(Tab tab, FragmentTransaction ft) {
+            Object tag = tab.getTag();
+            for (int i=0; i<mTabs.size(); i++) {
+                if (mTabs.get(i) == tag) {
+                    mViewPager.setCurrentItem(i);
+                }
+            }
+        }
+
+        @Override
+        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
+        }
+
+        @Override
+        public void onTabReselected(Tab tab, FragmentTransaction ft) {
+        }
+    }
+}
+//END_INCLUDE(complete)
diff --git a/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentTabsFragment.java b/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentTabsFragment.java
new file mode 100644
index 0000000..fbc464d
--- /dev/null
+++ b/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentTabsFragment.java
@@ -0,0 +1,187 @@
+/*
+ * 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.supportv13.app;
+
+import java.util.HashMap;
+
+import com.example.android.supportv13.R;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.app.FragmentTransaction;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TabHost;
+
+public class FragmentTabsFragment extends Fragment {
+    TabHost mTabHost;
+    TabManager mTabManager;
+    String mCurrentTabTag;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        View v = inflater.inflate(R.layout.fragment_tabs_fragment, container, false);
+        mTabHost = (TabHost)v.findViewById(android.R.id.tabhost);
+        mTabHost.setup();
+
+        mTabManager = new TabManager(getActivity(), getChildFragmentManager(),
+                mTabHost, R.id.realtabcontent);
+
+        mTabManager.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"),
+                CountingFragment.class, null);
+        mTabManager.addTab(mTabHost.newTabSpec("array").setIndicator("Array"),
+                FragmentPagerSupport.ArrayListFragment.class, null);
+        mTabManager.addTab(mTabHost.newTabSpec("cursor").setIndicator("Cursor"),
+                CursorFragment.class, null);
+
+        return v;
+    }
+
+    @Override
+    public void onViewStateRestored(Bundle savedInstanceState) {
+        super.onViewStateRestored(savedInstanceState);
+        if (savedInstanceState != null) {
+            mCurrentTabTag = savedInstanceState.getString("tab");
+        }
+        mTabHost.setCurrentTabByTag(mCurrentTabTag);
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        // Need to remember the selected tab so that we can restore it if
+        // we later re-create the views.
+        mCurrentTabTag = mTabHost.getCurrentTabTag();
+        mTabHost = null;
+        mTabManager = null;
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putString("tab", mTabHost != null
+                ? mTabHost.getCurrentTabTag() : mCurrentTabTag);
+    }
+
+    /**
+     * This is a helper class that implements a generic mechanism for
+     * associating fragments with the tabs in a tab host.  It relies on a
+     * trick.  Normally a tab host has a simple API for supplying a View or
+     * Intent that each tab will show.  This is not sufficient for switching
+     * between fragments.  So instead we make the content part of the tab host
+     * 0dp high (it is not shown) and the TabManager supplies its own dummy
+     * view to show as the tab content.  It listens to changes in tabs, and takes
+     * care of switch to the correct fragment shown in a separate content area
+     * whenever the selected tab changes.
+     */
+    public static class TabManager implements TabHost.OnTabChangeListener {
+        private final Context mContext;
+        private final FragmentManager mManager;
+        private final TabHost mTabHost;
+        private final int mContainerId;
+        private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
+        TabInfo mLastTab;
+
+        static final class TabInfo {
+            private final String tag;
+            private final Class<?> clss;
+            private final Bundle args;
+            private Fragment fragment;
+
+            TabInfo(String _tag, Class<?> _class, Bundle _args) {
+                tag = _tag;
+                clss = _class;
+                args = _args;
+            }
+        }
+
+        static class DummyTabFactory implements TabHost.TabContentFactory {
+            private final Context mContext;
+
+            public DummyTabFactory(Context context) {
+                mContext = context;
+            }
+
+            @Override
+            public View createTabContent(String tag) {
+                View v = new View(mContext);
+                v.setMinimumWidth(0);
+                v.setMinimumHeight(0);
+                return v;
+            }
+        }
+
+        public TabManager(Context context, FragmentManager manager, TabHost tabHost,
+                int containerId) {
+            mContext = context;
+            mManager = manager;
+            mTabHost = tabHost;
+            mContainerId = containerId;
+            mTabHost.setOnTabChangedListener(this);
+        }
+
+        public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
+            tabSpec.setContent(new DummyTabFactory(mContext));
+            String tag = tabSpec.getTag();
+
+            TabInfo info = new TabInfo(tag, clss, args);
+
+            // Check to see if we already have a fragment for this tab, probably
+            // from a previously saved state.  If so, deactivate it, because our
+            // initial state is that a tab isn't shown.
+            info.fragment = mManager.findFragmentByTag(tag);
+            if (info.fragment != null && !info.fragment.isDetached()) {
+                FragmentTransaction ft = mManager.beginTransaction();
+                ft.detach(info.fragment);
+                ft.commit();
+            }
+
+            mTabs.put(tag, info);
+            mTabHost.addTab(tabSpec);
+        }
+
+        @Override
+        public void onTabChanged(String tabId) {
+            TabInfo newTab = mTabs.get(tabId);
+            if (mLastTab != newTab) {
+                FragmentTransaction ft = mManager.beginTransaction();
+                if (mLastTab != null) {
+                    if (mLastTab.fragment != null) {
+                        ft.detach(mLastTab.fragment);
+                    }
+                }
+                if (newTab != null) {
+                    if (newTab.fragment == null) {
+                        newTab.fragment = Fragment.instantiate(mContext,
+                                newTab.clss.getName(), newTab.args);
+                        ft.add(mContainerId, newTab.fragment, newTab.tag);
+                    } else {
+                        ft.attach(newTab.fragment);
+                    }
+                }
+
+                mLastTab = newTab;
+                ft.commit();
+                mManager.executePendingTransactions();
+            }
+        }
+    }
+}
+//END_INCLUDE(complete)