New API demo showing how to make a resource reference.

Change-Id: I450d70432debc9d7f58a7f6597628dacc0225ddd

samples/ApiDemos/src/com/example/android/apis/content/ResourcesLayoutReference.java

@@ -0,0 +1,33 @@
+/*
+ * 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.apis.content;
+
+import com.example.android.apis.R;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class ResourcesLayoutReference extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // This layout uses different configurations to adjust
+        // what is shown based on the smallest width that will occur.
+        setContentView(R.layout.resources_layout_reference);
+    }
+}

samples/ApiDemos/src/com/example/android/apis/content/_index.html

@@ -8,4 +8,17 @@
 
   <dt><a href="ResourcesSample.html">Resources</a></dt>
   <dd>Demonstrates loading styled strings from a resource file, and extracting the raw text. </dd>
+
+  <dt><a href="ResourcesLayoutReference.html">Resources Layout Reference</a></dt>
+  <dd>Shows how to make references between resources; this examples shows how this
+      can be used to define multiple configurations for a layout resource that
+      reference the same layout XML.</dd>
+
+  <dt><a href="ResourcesSmallestWidth.html">Resources Smallest Width</a></dt>
+  <dd>Shows how you can vary a layout resource based on the device's smallest
+      width configuration</dd>
+
+  <dt><a href="ResourcesWidthAndHeight.html">Resources Width and Height</a></dt>
+  <dd>Shows how you can vary a layout resource based on the device's current
+      width dp and height dp configurations.</dd>
 </dl>