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diff --git a/android-libraries/ActionBarSherlock/src/com/actionbarsherlock/view/ActionProvider.java b/android-libraries/ActionBarSherlock/src/com/actionbarsherlock/view/ActionProvider.java
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+/*
+ * 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.actionbarsherlock.view;
+
+import android.content.Context;
+import android.view.View;
+
+/**
+ * This class is a mediator for accomplishing a given task, for example sharing a file.
+ * It is responsible for creating a view that performs an action that accomplishes the task.
+ * This class also implements other functions such a performing a default action.
+ * <p>
+ * An ActionProvider can be optionally specified for a {@link MenuItem} and in such a
+ * case it will be responsible for creating the action view that appears in the
+ * {@link android.app.ActionBar} as a substitute for the menu item when the item is
+ * displayed as an action item. Also the provider is responsible for performing a
+ * default action if a menu item placed on the overflow menu of the ActionBar is
+ * selected and none of the menu item callbacks has handled the selection. For this
+ * case the provider can also optionally provide a sub-menu for accomplishing the
+ * task at hand.
+ * </p>
+ * <p>
+ * There are two ways for using an action provider for creating and handling of action views:
+ * <ul>
+ * <li>
+ * Setting the action provider on a {@link MenuItem} directly by calling
+ * {@link MenuItem#setActionProvider(ActionProvider)}.
+ * </li>
+ * <li>
+ * Declaring the action provider in the menu XML resource. For example:
+ * <pre>
+ * <code>
+ *   &lt;item android:id="@+id/my_menu_item"
+ *     android:title="Title"
+ *     android:icon="@drawable/my_menu_item_icon"
+ *     android:showAsAction="ifRoom"
+ *     android:actionProviderClass="foo.bar.SomeActionProvider" /&gt;
+ * </code>
+ * </pre>
+ * </li>
+ * </ul>
+ * </p>
+ *
+ * @see MenuItem#setActionProvider(ActionProvider)
+ * @see MenuItem#getActionProvider()
+ */
+public abstract class ActionProvider {
+    private SubUiVisibilityListener mSubUiVisibilityListener;
+
+    /**
+     * Creates a new instance.
+     *
+     * @param context Context for accessing resources.
+     */
+    public ActionProvider(Context context) {
+    }
+
+    /**
+     * Factory method for creating new action views.
+     *
+     * @return A new action view.
+     */
+    public abstract View onCreateActionView();
+
+    /**
+     * Performs an optional default action.
+     * <p>
+     * For the case of an action provider placed in a menu item not shown as an action this
+     * method is invoked if previous callbacks for processing menu selection has handled
+     * the event.
+     * </p>
+     * <p>
+     * A menu item selection is processed in the following order:
+     * <ul>
+     * <li>
+     * Receiving a call to {@link MenuItem.OnMenuItemClickListener#onMenuItemClick
+     *  MenuItem.OnMenuItemClickListener.onMenuItemClick}.
+     * </li>
+     * <li>
+     * Receiving a call to {@link android.app.Activity#onOptionsItemSelected(MenuItem)
+     *  Activity.onOptionsItemSelected(MenuItem)}
+     * </li>
+     * <li>
+     * Receiving a call to {@link android.app.Fragment#onOptionsItemSelected(MenuItem)
+     *  Fragment.onOptionsItemSelected(MenuItem)}
+     * </li>
+     * <li>
+     * Launching the {@link android.content.Intent} set via
+     * {@link MenuItem#setIntent(android.content.Intent) MenuItem.setIntent(android.content.Intent)}
+     * </li>
+     * <li>
+     * Invoking this method.
+     * </li>
+     * </ul>
+     * </p>
+     * <p>
+     * The default implementation does not perform any action and returns false.
+     * </p>
+     */
+    public boolean onPerformDefaultAction() {
+        return false;
+    }
+
+    /**
+     * Determines if this ActionProvider has a submenu associated with it.
+     *
+     * <p>Associated submenus will be shown when an action view is not. This
+     * provider instance will receive a call to {@link #onPrepareSubMenu(SubMenu)}
+     * after the call to {@link #onPerformDefaultAction()} and before a submenu is
+     * displayed to the user.
+     *
+     * @return true if the item backed by this provider should have an associated submenu
+     */
+    public boolean hasSubMenu() {
+        return false;
+    }
+
+    /**
+     * Called to prepare an associated submenu for the menu item backed by this ActionProvider.
+     *
+     * <p>if {@link #hasSubMenu()} returns true, this method will be called when the
+     * menu item is selected to prepare the submenu for presentation to the user. Apps
+     * may use this to create or alter submenu content right before display.
+     *
+     * @param subMenu Submenu that will be displayed
+     */
+    public void onPrepareSubMenu(SubMenu subMenu) {
+    }
+
+    /**
+     * Notify the system that the visibility of an action view's sub-UI such as
+     * an anchored popup has changed. This will affect how other system
+     * visibility notifications occur.
+     *
+     * @hide Pending future API approval
+     */
+    public void subUiVisibilityChanged(boolean isVisible) {
+        if (mSubUiVisibilityListener != null) {
+            mSubUiVisibilityListener.onSubUiVisibilityChanged(isVisible);
+        }
+    }
+
+    /**
+     * @hide Internal use only
+     */
+    public void setSubUiVisibilityListener(SubUiVisibilityListener listener) {
+        mSubUiVisibilityListener = listener;
+    }
+
+    /**
+     * @hide Internal use only
+     */
+    public interface SubUiVisibilityListener {
+        public void onSubUiVisibilityChanged(boolean isVisible);
+    }
+}