Adding a code sample for how to write a custom action provider.

NOTE: This change does *not* affect the system image rather only the SDK.

bug:5499856

Change-Id: I589ed412b72e94b21dbe1f069006c7c527a06c71

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

@@ -0,0 +1,121 @@
+/*
+ * 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.app;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.provider.Settings;
+import android.view.ActionProvider;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.ImageButton;
+import android.widget.Toast;
+
+import com.example.android.apis.R;
+
+/**
+ * This activity demonstrates how to implement an {@link android.view.ActionProvider}
+ * for adding functionality to the Action Bar. In particular this demo creates an
+ * ActionProvider for launching the system settings and adds a menu item with that
+ * provider.
+ */
+public class ActionBarSettingsActionProviderActivity extends Activity {
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        super.onCreateOptionsMenu(menu);
+        getMenuInflater().inflate(R.menu.action_bar_settings_action_provider, menu);
+        return true;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // If this callback does not handle the item click, onPerformDefaultAction
+        // of the ActionProvider is invoked. Hence, the provider encapsulates the
+        // complete functionality of the menu item.
+        Toast.makeText(this, R.string.action_bar_settings_action_provider_no_handling,
+                Toast.LENGTH_SHORT).show();
+        return false;
+    }
+
+    public static class SettingsActionProvider extends ActionProvider {
+
+        /** An intent for launching the system settings. */
+        private static final Intent sSettingsIntent = new Intent(Settings.ACTION_SETTINGS);
+
+        /** Context for accessing resources. */
+        private final Context mContext;
+
+        /**
+         * Creates a new instance.
+         *
+         * @param context Context for accessing resources.
+         */
+        public SettingsActionProvider(Context context) {
+            super(context);
+            mContext = context;
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        @Override
+        public View onCreateActionView() {
+            // Inflate the action view to be shown on the action bar.
+            LayoutInflater layoutInflater = LayoutInflater.from(mContext);
+            View view = layoutInflater.inflate(R.layout.action_bar_settings_action_provider, null);
+            ImageButton button = (ImageButton) view.findViewById(R.id.button);
+            // Attach a click listener for launching the system settings.
+            button.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    mContext.startActivity(sSettingsIntent);
+                }
+            });
+            return view;
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        @Override
+        public boolean onPerformDefaultAction() {
+            // This is called if the host menu item placed in the overflow menu of the
+            // action bar is clicked and the host activity did not handle the click.
+            mContext.startActivity(sSettingsIntent);
+            return true;
+        }
+    }
+}

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

@@ -38,7 +38,7 @@ import java.io.InputStream;
  * a menu item with ShareActionProvider as its action provider. The
  * ShareActionProvider is responsible for managing the UI for sharing actions.
  */
-public class ActionBarActionProviderActivity extends Activity {
+public class ActionBarShareActionProviderActivity extends Activity {
 
     private static final String SHARED_FILE_NAME = "shared.png";
 
@@ -51,7 +51,7 @@ public class ActionBarActionProviderActivity extends Activity {
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate your menu.
-        getMenuInflater().inflate(R.menu.action_bar_action_provider, menu);
+        getMenuInflater().inflate(R.menu.action_bar_share_action_provider, menu);
 
         // Set file with share history to the provider and set the share intent.
         MenuItem actionItem = menu.findItem(R.id.menu_item_share_action_provider_action_bar);

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

@@ -160,10 +160,12 @@ complete example of how to switch between fragments.</dd>
 default Honeycomb theme includes the Action Bar by default and a menu resource is used to populate
 the menu data itself. If you'd like to see how these things work under the hood, see
 Mechanics.</dd>
-  <dt><a href="ActionBarActionProviderActivity.html">ActionProvider</a></dt>
-  <dd>Shows how to use an ActionProvider to supply a menu item with a specialized action view and
-  handle standard menu item clicks in one place. Demonstrated using the streamlined sharing UI
-  added in ICS. </dd>
+  <dt><a href="ActionBarActionProviderSettingsActivity.html">Settings Action Provider</a></dt>
+  <dd>Shows how to implement an ActionProvider for launching the system settings that supplies a
+  menu item with a specialized action view and handles standard menu item clicks in one place.</dd>
+  <dt><a href="ActionBarShareActionProviderActivity.html">Share Action Provider</a></dt>
+  <dd>Shows how to use a ShareActionProvider to embed sharing functionality in your application
+  via the streamlined sharing UI added in ICS. </dd>
   <dt><a href="ActionBarDisplayOptions.html">Display Options</a></dt>
   <dd>Shows how various Action Bar display option flags can be combined and their effects.</dd>
 </dl>