Half-done new wallpaper API demo.

samples/ApiDemos/AndroidManifest.xml

@@ -72,6 +72,15 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".app.WallpaperActivity"
+                android:label="@string/activity_wallpaper"
+                android:theme="@style/Theme.Wallpaper">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".app.TranslucentActivity"
                 android:label="@string/activity_translucent"
                 android:theme="@style/Theme.Translucent">

samples/ApiDemos/res/values/strings.xml

@@ -38,6 +38,8 @@
             custom Theme.Dialog theme to make an activity that looks like a
             customized dialog, here with an ugly frame.</string>
 
+    <string name="activity_wallpaper">App/Activity/Wallpaper</string>
+    
     <string name="activity_translucent">App/Activity/Translucent</string>
     <string name="translucent_background">Example of how you can make an
             activity have a translucent background, compositing over

samples/ApiDemos/res/values/styles.xml

@@ -37,6 +37,14 @@
         <item name="android:windowBackground">@drawable/filled_box</item>
     </style>
 
+    <!-- A theme that has a wallpaper background.  Here we explicitly specify
+         that this theme is to inherit from the system's translucent theme,
+         which sets up various attributes correctly.. -->
+    <style name="Theme.Wallpaper" parent="android:style/Theme.Translucent">
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:colorForeground">#fff</item>
+    </style>
+
     <!-- A theme that has a translucent background.  Here we explicitly specify
          that this theme is to inherit from the system's translucent theme,
          which sets up various attributes correctly.. -->

samples/ApiDemos/src/com/example/android/apis/app/WallpaperActivity.java

@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+package com.example.android.apis.app;
+
+// Need the following import to get access to the app resources, since this
+// class is in a sub-package.
+import com.example.android.apis.R;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.WindowManager;
+
+/**
+ * <h3>Wallpaper Activity</h3>
+ * 
+ * <p>This demonstrates the how to write an activity that has the system
+ * wallpaper behind it.</p>
+ */
+public class WallpaperActivity extends Activity {
+    /**
+     * Initialization of the Activity after it is first created.  Must at least
+     * call {@link android.app.Activity#setContentView setContentView()} to
+     * describe what is to be displayed in the screen.
+     */
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        // Be sure to call the super class.
+        super.onCreate(savedInstanceState);
+        
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER);
+        
+        // See assets/res/any/layout/translucent_background.xml for this
+        // view layout definition, which is being set here as
+        // the content of our screen.
+        setContentView(R.layout.translucent_background);
+    }
+}