From da96aacf55d113c9a91b8e760b3ffef88b11f786 Mon Sep 17 00:00:00 2001 From: Dominik Date: Fri, 20 Apr 2012 12:14:21 +0200 Subject: ActionBarSherlock 4.0.2 --- .../widget/ActivityChooserModel.java | 1131 ++++++++++++++++++++ .../widget/ActivityChooserView.java | 818 ++++++++++++++ .../widget/ShareActionProvider.java | 316 ++++++ 3 files changed, 2265 insertions(+) create mode 100644 com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserModel.java create mode 100644 com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserView.java create mode 100644 com_actionbarsherlock/src/com/actionbarsherlock/widget/ShareActionProvider.java (limited to 'com_actionbarsherlock/src/com/actionbarsherlock/widget') diff --git a/com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserModel.java b/com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserModel.java new file mode 100644 index 000000000..379207471 --- /dev/null +++ b/com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserModel.java @@ -0,0 +1,1131 @@ +/* + * 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.widget; + +import android.content.ComponentName; +import android.content.Context; +import android.content.Intent; +import android.content.pm.ResolveInfo; +import android.database.DataSetObservable; +import android.os.Handler; +import android.text.TextUtils; +import android.util.Log; +import android.util.Xml; + +import org.xmlpull.v1.XmlPullParser; +import org.xmlpull.v1.XmlPullParserException; +import org.xmlpull.v1.XmlSerializer; + +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.FileOutputStream; +import java.io.IOException; +import java.math.BigDecimal; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.LinkedHashSet; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.Executor; + +/** + *

+ * This class represents a data model for choosing a component for handing a + * given {@link Intent}. The model is responsible for querying the system for + * activities that can handle the given intent and order found activities + * based on historical data of previous choices. The historical data is stored + * in an application private file. If a client does not want to have persistent + * choice history the file can be omitted, thus the activities will be ordered + * based on historical usage for the current session. + *

+ *

+ * For each backing history file there is a singleton instance of this class. Thus, + * several clients that specify the same history file will share the same model. Note + * that if multiple clients are sharing the same model they should implement semantically + * equivalent functionality since setting the model intent will change the found + * activities and they may be inconsistent with the functionality of some of the clients. + * For example, choosing a share activity can be implemented by a single backing + * model and two different views for performing the selection. If however, one of the + * views is used for sharing but the other for importing, for example, then each + * view should be backed by a separate model. + *

+ *

+ * The way clients interact with this class is as follows: + *

+ *

+ * 

+ * 
+ *  // Get a model and set it to a couple of clients with semantically similar function.
+ *  ActivityChooserModel dataModel =
+ *      ActivityChooserModel.get(context, "task_specific_history_file_name.xml");
+ *
+ *  ActivityChooserModelClient modelClient1 = getActivityChooserModelClient1();
+ *  modelClient1.setActivityChooserModel(dataModel);
+ *
+ *  ActivityChooserModelClient modelClient2 = getActivityChooserModelClient2();
+ *  modelClient2.setActivityChooserModel(dataModel);
+ *
+ *  // Set an intent to choose a an activity for.
+ *  dataModel.setIntent(intent);
+ * 
+ * 
+ * 

+ * 

+ * Note: This class is thread safe.
+ * 

+ *
+ * @hide
+ */
+class ActivityChooserModel extends DataSetObservable {
+
+    /**
+     * Client that utilizes an {@link ActivityChooserModel}.
+     */
+    public interface ActivityChooserModelClient {
+
+        /**
+         * Sets the {@link ActivityChooserModel}.
+         *
+         * @param dataModel The model.
+         */
+        public void setActivityChooserModel(ActivityChooserModel dataModel);
+    }
+
+    /**
+     * Defines a sorter that is responsible for sorting the activities
+     * based on the provided historical choices and an intent.
+     */
+    public interface ActivitySorter {
+
+        /**
+         * Sorts the activities in descending order of relevance
+         * based on previous history and an intent.
+         *
+         * @param intent The {@link Intent}.
+         * @param activities Activities to be sorted.
+         * @param historicalRecords Historical records.
+         */
+        // This cannot be done by a simple comparator since an Activity weight
+        // is computed from history. Note that Activity implements Comparable.
+        public void sort(Intent intent, List activities,
+                List historicalRecords);
+    }
+
+    /**
+     * Listener for choosing an activity.
+     */
+    public interface OnChooseActivityListener {
+
+        /**
+         * Called when an activity has been chosen. The client can decide whether
+         * an activity can be chosen and if so the caller of
+         * {@link ActivityChooserModel#chooseActivity(int)} will receive and {@link Intent}
+         * for launching it.
+         * 

+         * Note: Modifying the intent is not permitted and
+         *     any changes to the latter will be ignored.
+         * 

+         *
+         * @param host The listener's host model.
+         * @param intent The intent for launching the chosen activity.
+         * @return Whether the intent is handled and should not be delivered to clients.
+         *
+         * @see ActivityChooserModel#chooseActivity(int)
+         */
+        public boolean onChooseActivity(ActivityChooserModel host, Intent intent);
+    }
+
+    /**
+     * Flag for selecting debug mode.
+     */
+    private static final boolean DEBUG = false;
+
+    /**
+     * Tag used for logging.
+     */
+    private static final String LOG_TAG = ActivityChooserModel.class.getSimpleName();
+
+    /**
+     * The root tag in the history file.
+     */
+    private static final String TAG_HISTORICAL_RECORDS = "historical-records";
+
+    /**
+     * The tag for a record in the history file.
+     */
+    private static final String TAG_HISTORICAL_RECORD = "historical-record";
+
+    /**
+     * Attribute for the activity.
+     */
+    private static final String ATTRIBUTE_ACTIVITY = "activity";
+
+    /**
+     * Attribute for the choice time.
+     */
+    private static final String ATTRIBUTE_TIME = "time";
+
+    /**
+     * Attribute for the choice weight.
+     */
+    private static final String ATTRIBUTE_WEIGHT = "weight";
+
+    /**
+     * The default name of the choice history file.
+     */
+    public static final String DEFAULT_HISTORY_FILE_NAME =
+        "activity_choser_model_history.xml";
+
+    /**
+     * The default maximal length of the choice history.
+     */
+    public static final int DEFAULT_HISTORY_MAX_LENGTH = 50;
+
+    /**
+     * The amount with which to inflate a chosen activity when set as default.
+     */
+    private static final int DEFAULT_ACTIVITY_INFLATION = 5;
+
+    /**
+     * Default weight for a choice record.
+     */
+    private static final float DEFAULT_HISTORICAL_RECORD_WEIGHT = 1.0f;
+
+    /**
+     * The extension of the history file.
+     */
+    private static final String HISTORY_FILE_EXTENSION = ".xml";
+
+    /**
+     * An invalid item index.
+     */
+    private static final int INVALID_INDEX = -1;
+
+    /**
+     * Lock to guard the model registry.
+     */
+    private static final Object sRegistryLock = new Object();
+
+    /**
+     * This the registry for data models.
+     */
+    private static final Map sDataModelRegistry =
+        new HashMap();
+
+    /**
+     * Lock for synchronizing on this instance.
+     */
+    private final Object mInstanceLock = new Object();
+
+    /**
+     * List of activities that can handle the current intent.
+     */
+    private final List mActivites = new ArrayList();
+
+    /**
+     * List with historical choice records.
+     */
+    private final List mHistoricalRecords = new ArrayList();
+
+    /**
+     * Context for accessing resources.
+     */
+    private final Context mContext;
+
+    /**
+     * The name of the history file that backs this model.
+     */
+    private final String mHistoryFileName;
+
+    /**
+     * The intent for which a activity is being chosen.
+     */
+    private Intent mIntent;
+
+    /**
+     * The sorter for ordering activities based on intent and past choices.
+     */
+    private ActivitySorter mActivitySorter = new DefaultSorter();
+
+    /**
+     * The maximal length of the choice history.
+     */
+    private int mHistoryMaxSize = DEFAULT_HISTORY_MAX_LENGTH;
+
+    /**
+     * Flag whether choice history can be read. In general many clients can
+     * share the same data model and {@link #readHistoricalData()} may be called
+     * by arbitrary of them any number of times. Therefore, this class guarantees
+     * that the very first read succeeds and subsequent reads can be performed
+     * only after a call to {@link #persistHistoricalData()} followed by change
+     * of the share records.
+     */
+    private boolean mCanReadHistoricalData = true;
+
+    /**
+     * Flag whether the choice history was read. This is used to enforce that
+     * before calling {@link #persistHistoricalData()} a call to
+     * {@link #persistHistoricalData()} has been made. This aims to avoid a
+     * scenario in which a choice history file exits, it is not read yet and
+     * it is overwritten. Note that always all historical records are read in
+     * full and the file is rewritten. This is necessary since we need to
+     * purge old records that are outside of the sliding window of past choices.
+     */
+    private boolean mReadShareHistoryCalled = false;
+
+    /**
+     * Flag whether the choice records have changed. In general many clients can
+     * share the same data model and {@link #persistHistoricalData()} may be called
+     * by arbitrary of them any number of times. Therefore, this class guarantees
+     * that choice history will be persisted only if it has changed.
+     */
+    private boolean mHistoricalRecordsChanged = true;
+
+    /**
+     * Hander for scheduling work on client tread.
+     */
+    private final Handler mHandler = new Handler();
+
+    /**
+     * Policy for controlling how the model handles chosen activities.
+     */
+    private OnChooseActivityListener mActivityChoserModelPolicy;
+
+    /**
+     * Gets the data model backed by the contents of the provided file with historical data.
+     * Note that only one data model is backed by a given file, thus multiple calls with
+     * the same file name will return the same model instance. If no such instance is present
+     * it is created.
+     * 

+     * Note: To use the default historical data file clients should explicitly
+     * pass as file name {@link #DEFAULT_HISTORY_FILE_NAME}. If no persistence of the choice
+     * history is desired clients should pass null for the file name. In such
+     * case a new model is returned for each invocation.
+     * 

+     *
+     * 

+     * Always use difference historical data files for semantically different actions.
+     * For example, sharing is different from importing.
+     * 

+     *
+     * @param context Context for loading resources.
+     * @param historyFileName File name with choice history, null
+     *        if the model should not be backed by a file. In this case the activities
+     *        will be ordered only by data from the current session.
+     *
+     * @return The model.
+     */
+    public static ActivityChooserModel get(Context context, String historyFileName) {
+        synchronized (sRegistryLock) {
+            ActivityChooserModel dataModel = sDataModelRegistry.get(historyFileName);
+            if (dataModel == null) {
+                dataModel = new ActivityChooserModel(context, historyFileName);
+                sDataModelRegistry.put(historyFileName, dataModel);
+            }
+            dataModel.readHistoricalData();
+            return dataModel;
+        }
+    }
+
+    /**
+     * Creates a new instance.
+     *
+     * @param context Context for loading resources.
+     * @param historyFileName The history XML file.
+     */
+    private ActivityChooserModel(Context context, String historyFileName) {
+        mContext = context.getApplicationContext();
+        if (!TextUtils.isEmpty(historyFileName)
+                && !historyFileName.endsWith(HISTORY_FILE_EXTENSION)) {
+            mHistoryFileName = historyFileName + HISTORY_FILE_EXTENSION;
+        } else {
+            mHistoryFileName = historyFileName;
+        }
+    }
+
+    /**
+     * Sets an intent for which to choose a activity.
+     * 

+     * Note: Clients must set only semantically similar
+     * intents for each data model.
+     * 

+     *
+     * @param intent The intent.
+     */
+    public void setIntent(Intent intent) {
+        synchronized (mInstanceLock) {
+            if (mIntent == intent) {
+                return;
+            }
+            mIntent = intent;
+            loadActivitiesLocked();
+        }
+    }
+
+    /**
+     * Gets the intent for which a activity is being chosen.
+     *
+     * @return The intent.
+     */
+    public Intent getIntent() {
+        synchronized (mInstanceLock) {
+            return mIntent;
+        }
+    }
+
+    /**
+     * Gets the number of activities that can handle the intent.
+     *
+     * @return The activity count.
+     *
+     * @see #setIntent(Intent)
+     */
+    public int getActivityCount() {
+        synchronized (mInstanceLock) {
+            return mActivites.size();
+        }
+    }
+
+    /**
+     * Gets an activity at a given index.
+     *
+     * @return The activity.
+     *
+     * @see ActivityResolveInfo
+     * @see #setIntent(Intent)
+     */
+    public ResolveInfo getActivity(int index) {
+        synchronized (mInstanceLock) {
+            return mActivites.get(index).resolveInfo;
+        }
+    }
+
+    /**
+     * Gets the index of a the given activity.
+     *
+     * @param activity The activity index.
+     *
+     * @return The index if found, -1 otherwise.
+     */
+    public int getActivityIndex(ResolveInfo activity) {
+        List activities = mActivites;
+        final int activityCount = activities.size();
+        for (int i = 0; i < activityCount; i++) {
+            ActivityResolveInfo currentActivity = activities.get(i);
+            if (currentActivity.resolveInfo == activity) {
+                return i;
+            }
+        }
+        return INVALID_INDEX;
+    }
+
+    /**
+     * Chooses a activity to handle the current intent. This will result in
+     * adding a historical record for that action and construct intent with
+     * its component name set such that it can be immediately started by the
+     * client.
+     * 

+     * Note: By calling this method the client guarantees
+     * that the returned intent will be started. This intent is returned to
+     * the client solely to let additional customization before the start.
+     * 

+     *
+     * @return An {@link Intent} for launching the activity or null if the
+     *         policy has consumed the intent.
+     *
+     * @see HistoricalRecord
+     * @see OnChooseActivityListener
+     */
+    public Intent chooseActivity(int index) {
+        ActivityResolveInfo chosenActivity = mActivites.get(index);
+
+        ComponentName chosenName = new ComponentName(
+                chosenActivity.resolveInfo.activityInfo.packageName,
+                chosenActivity.resolveInfo.activityInfo.name);
+
+        Intent choiceIntent = new Intent(mIntent);
+        choiceIntent.setComponent(chosenName);
+
+        if (mActivityChoserModelPolicy != null) {
+            // Do not allow the policy to change the intent.
+            Intent choiceIntentCopy = new Intent(choiceIntent);
+            final boolean handled = mActivityChoserModelPolicy.onChooseActivity(this,
+                    choiceIntentCopy);
+            if (handled) {
+                return null;
+            }
+        }
+
+        HistoricalRecord historicalRecord = new HistoricalRecord(chosenName,
+                System.currentTimeMillis(), DEFAULT_HISTORICAL_RECORD_WEIGHT);
+        addHisoricalRecord(historicalRecord);
+
+        return choiceIntent;
+    }
+
+    /**
+     * Sets the listener for choosing an activity.
+     *
+     * @param listener The listener.
+     */
+    public void setOnChooseActivityListener(OnChooseActivityListener listener) {
+        mActivityChoserModelPolicy = listener;
+    }
+
+    /**
+     * Gets the default activity, The default activity is defined as the one
+     * with highest rank i.e. the first one in the list of activities that can
+     * handle the intent.
+     *
+     * @return The default activity, null id not activities.
+     *
+     * @see #getActivity(int)
+     */
+    public ResolveInfo getDefaultActivity() {
+        synchronized (mInstanceLock) {
+            if (!mActivites.isEmpty()) {
+                return mActivites.get(0).resolveInfo;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Sets the default activity. The default activity is set by adding a
+     * historical record with weight high enough that this activity will
+     * become the highest ranked. Such a strategy guarantees that the default
+     * will eventually change if not used. Also the weight of the record for
+     * setting a default is inflated with a constant amount to guarantee that
+     * it will stay as default for awhile.
+     *
+     * @param index The index of the activity to set as default.
+     */
+    public void setDefaultActivity(int index) {
+        ActivityResolveInfo newDefaultActivity = mActivites.get(index);
+        ActivityResolveInfo oldDefaultActivity = mActivites.get(0);
+
+        final float weight;
+        if (oldDefaultActivity != null) {
+            // Add a record with weight enough to boost the chosen at the top.
+            weight = oldDefaultActivity.weight - newDefaultActivity.weight
+                + DEFAULT_ACTIVITY_INFLATION;
+        } else {
+            weight = DEFAULT_HISTORICAL_RECORD_WEIGHT;
+        }
+
+        ComponentName defaultName = new ComponentName(
+                newDefaultActivity.resolveInfo.activityInfo.packageName,
+                newDefaultActivity.resolveInfo.activityInfo.name);
+        HistoricalRecord historicalRecord = new HistoricalRecord(defaultName,
+                System.currentTimeMillis(), weight);
+        addHisoricalRecord(historicalRecord);
+    }
+
+    /**
+     * Reads the history data from the backing file if the latter
+     * was provided. Calling this method more than once before a call
+     * to {@link #persistHistoricalData()} has been made has no effect.
+     * 

+     * Note: Historical data is read asynchronously and
+     *       as soon as the reading is completed any registered
+     *       {@link DataSetObserver}s will be notified. Also no historical
+     *       data is read until this method is invoked.
+     * 

+     */
+    private void readHistoricalData() {
+        synchronized (mInstanceLock) {
+            if (!mCanReadHistoricalData || !mHistoricalRecordsChanged) {
+                return;
+            }
+            mCanReadHistoricalData = false;
+            mReadShareHistoryCalled = true;
+            if (!TextUtils.isEmpty(mHistoryFileName)) {
+                /*AsyncTask.*/SERIAL_EXECUTOR.execute(new HistoryLoader());
+            }
+        }
+    }
+
+    private static final SerialExecutor SERIAL_EXECUTOR = new SerialExecutor();
+
+    private static class SerialExecutor implements Executor {
+        final LinkedList mTasks = new LinkedList();
+        Runnable mActive;
+
+        public synchronized void execute(final Runnable r) {
+            mTasks.offer(new Runnable() {
+                public void run() {
+                    try {
+                        r.run();
+                    } finally {
+                        scheduleNext();
+                    }
+                }
+            });
+            if (mActive == null) {
+                scheduleNext();
+            }
+        }
+
+        protected synchronized void scheduleNext() {
+            if ((mActive = mTasks.poll()) != null) {
+                mActive.run();
+            }
+        }
+    }
+
+    /**
+     * Persists the history data to the backing file if the latter
+     * was provided. Calling this method before a call to {@link #readHistoricalData()}
+     * throws an exception. Calling this method more than one without choosing an
+     * activity has not effect.
+     *
+     * @throws IllegalStateException If this method is called before a call to
+     *         {@link #readHistoricalData()}.
+     */
+    private void persistHistoricalData() {
+        synchronized (mInstanceLock) {
+            if (!mReadShareHistoryCalled) {
+                throw new IllegalStateException("No preceding call to #readHistoricalData");
+            }
+            if (!mHistoricalRecordsChanged) {
+                return;
+            }
+            mHistoricalRecordsChanged = false;
+            mCanReadHistoricalData = true;
+            if (!TextUtils.isEmpty(mHistoryFileName)) {
+                /*AsyncTask.*/SERIAL_EXECUTOR.execute(new HistoryPersister());
+            }
+        }
+    }
+
+    /**
+     * Sets the sorter for ordering activities based on historical data and an intent.
+     *
+     * @param activitySorter The sorter.
+     *
+     * @see ActivitySorter
+     */
+    public void setActivitySorter(ActivitySorter activitySorter) {
+        synchronized (mInstanceLock) {
+            if (mActivitySorter == activitySorter) {
+                return;
+            }
+            mActivitySorter = activitySorter;
+            sortActivities();
+        }
+    }
+
+    /**
+     * Sorts the activities based on history and an intent. If
+     * a sorter is not specified this a default implementation is used.
+     *
+     * @see #setActivitySorter(ActivitySorter)
+     */
+    private void sortActivities() {
+        synchronized (mInstanceLock) {
+            if (mActivitySorter != null && !mActivites.isEmpty()) {
+                mActivitySorter.sort(mIntent, mActivites,
+                        Collections.unmodifiableList(mHistoricalRecords));
+                notifyChanged();
+            }
+        }
+    }
+
+    /**
+     * Sets the maximal size of the historical data. Defaults to
+     * {@link #DEFAULT_HISTORY_MAX_LENGTH}
+     * 

+     *   Note: Setting this property will immediately
+     *   enforce the specified max history size by dropping enough old
+     *   historical records to enforce the desired size. Thus, any
+     *   records that exceed the history size will be discarded and
+     *   irreversibly lost.
+     * 

+     *
+     * @param historyMaxSize The max history size.
+     */
+    public void setHistoryMaxSize(int historyMaxSize) {
+        synchronized (mInstanceLock) {
+            if (mHistoryMaxSize == historyMaxSize) {
+                return;
+            }
+            mHistoryMaxSize = historyMaxSize;
+            pruneExcessiveHistoricalRecordsLocked();
+            sortActivities();
+        }
+    }
+
+    /**
+     * Gets the history max size.
+     *
+     * @return The history max size.
+     */
+    public int getHistoryMaxSize() {
+        synchronized (mInstanceLock) {
+            return mHistoryMaxSize;
+        }
+    }
+
+    /**
+     * Gets the history size.
+     *
+     * @return The history size.
+     */
+    public int getHistorySize() {
+        synchronized (mInstanceLock) {
+            return mHistoricalRecords.size();
+        }
+    }
+
+    /**
+     * Adds a historical record.
+     *
+     * @param historicalRecord The record to add.
+     * @return True if the record was added.
+     */
+    private boolean addHisoricalRecord(HistoricalRecord historicalRecord) {
+        synchronized (mInstanceLock) {
+            final boolean added = mHistoricalRecords.add(historicalRecord);
+            if (added) {
+                mHistoricalRecordsChanged = true;
+                pruneExcessiveHistoricalRecordsLocked();
+                persistHistoricalData();
+                sortActivities();
+            }
+            return added;
+        }
+    }
+
+    /**
+     * Prunes older excessive records to guarantee {@link #mHistoryMaxSize}.
+     */
+    private void pruneExcessiveHistoricalRecordsLocked() {
+        List choiceRecords = mHistoricalRecords;
+        final int pruneCount = choiceRecords.size() - mHistoryMaxSize;
+        if (pruneCount <= 0) {
+            return;
+        }
+        mHistoricalRecordsChanged = true;
+        for (int i = 0; i < pruneCount; i++) {
+            HistoricalRecord prunedRecord = choiceRecords.remove(0);
+            if (DEBUG) {
+                Log.i(LOG_TAG, "Pruned: " + prunedRecord);
+            }
+        }
+    }
+
+    /**
+     * Loads the activities.
+     */
+    private void loadActivitiesLocked() {
+        mActivites.clear();
+        if (mIntent != null) {
+            List resolveInfos =
+                mContext.getPackageManager().queryIntentActivities(mIntent, 0);
+            final int resolveInfoCount = resolveInfos.size();
+            for (int i = 0; i < resolveInfoCount; i++) {
+                ResolveInfo resolveInfo = resolveInfos.get(i);
+                mActivites.add(new ActivityResolveInfo(resolveInfo));
+            }
+            sortActivities();
+        } else {
+            notifyChanged();
+        }
+    }
+
+    /**
+     * Represents a record in the history.
+     */
+    public final static class HistoricalRecord {
+
+        /**
+         * The activity name.
+         */
+        public final ComponentName activity;
+
+        /**
+         * The choice time.
+         */
+        public final long time;
+
+        /**
+         * The record weight.
+         */
+        public final float weight;
+
+        /**
+         * Creates a new instance.
+         *
+         * @param activityName The activity component name flattened to string.
+         * @param time The time the activity was chosen.
+         * @param weight The weight of the record.
+         */
+        public HistoricalRecord(String activityName, long time, float weight) {
+            this(ComponentName.unflattenFromString(activityName), time, weight);
+        }
+
+        /**
+         * Creates a new instance.
+         *
+         * @param activityName The activity name.
+         * @param time The time the activity was chosen.
+         * @param weight The weight of the record.
+         */
+        public HistoricalRecord(ComponentName activityName, long time, float weight) {
+            this.activity = activityName;
+            this.time = time;
+            this.weight = weight;
+        }
+
+        @Override
+        public int hashCode() {
+            final int prime = 31;
+            int result = 1;
+            result = prime * result + ((activity == null) ? 0 : activity.hashCode());
+            result = prime * result + (int) (time ^ (time >>> 32));
+            result = prime * result + Float.floatToIntBits(weight);
+            return result;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj == null) {
+                return false;
+            }
+            if (getClass() != obj.getClass()) {
+                return false;
+            }
+            HistoricalRecord other = (HistoricalRecord) obj;
+            if (activity == null) {
+                if (other.activity != null) {
+                    return false;
+                }
+            } else if (!activity.equals(other.activity)) {
+                return false;
+            }
+            if (time != other.time) {
+                return false;
+            }
+            if (Float.floatToIntBits(weight) != Float.floatToIntBits(other.weight)) {
+                return false;
+            }
+            return true;
+        }
+
+        @Override
+        public String toString() {
+            StringBuilder builder = new StringBuilder();
+            builder.append("[");
+            builder.append("; activity:").append(activity);
+            builder.append("; time:").append(time);
+            builder.append("; weight:").append(new BigDecimal(weight));
+            builder.append("]");
+            return builder.toString();
+        }
+    }
+
+    /**
+     * Represents an activity.
+     */
+    public final class ActivityResolveInfo implements Comparable {
+
+        /**
+         * The {@link ResolveInfo} of the activity.
+         */
+        public final ResolveInfo resolveInfo;
+
+        /**
+         * Weight of the activity. Useful for sorting.
+         */
+        public float weight;
+
+        /**
+         * Creates a new instance.
+         *
+         * @param resolveInfo activity {@link ResolveInfo}.
+         */
+        public ActivityResolveInfo(ResolveInfo resolveInfo) {
+            this.resolveInfo = resolveInfo;
+        }
+
+        @Override
+        public int hashCode() {
+            return 31 + Float.floatToIntBits(weight);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj == null) {
+                return false;
+            }
+            if (getClass() != obj.getClass()) {
+                return false;
+            }
+            ActivityResolveInfo other = (ActivityResolveInfo) obj;
+            if (Float.floatToIntBits(weight) != Float.floatToIntBits(other.weight)) {
+                return false;
+            }
+            return true;
+        }
+
+        public int compareTo(ActivityResolveInfo another) {
+             return  Float.floatToIntBits(another.weight) - Float.floatToIntBits(weight);
+        }
+
+        @Override
+        public String toString() {
+            StringBuilder builder = new StringBuilder();
+            builder.append("[");
+            builder.append("resolveInfo:").append(resolveInfo.toString());
+            builder.append("; weight:").append(new BigDecimal(weight));
+            builder.append("]");
+            return builder.toString();
+        }
+    }
+
+    /**
+     * Default activity sorter implementation.
+     */
+    private final class DefaultSorter implements ActivitySorter {
+        private static final float WEIGHT_DECAY_COEFFICIENT = 0.95f;
+
+        private final Map mPackageNameToActivityMap =
+            new HashMap();
+
+        public void sort(Intent intent, List activities,
+                List historicalRecords) {
+            Map packageNameToActivityMap =
+                mPackageNameToActivityMap;
+            packageNameToActivityMap.clear();
+
+            final int activityCount = activities.size();
+            for (int i = 0; i < activityCount; i++) {
+                ActivityResolveInfo activity = activities.get(i);
+                activity.weight = 0.0f;
+                String packageName = activity.resolveInfo.activityInfo.packageName;
+                packageNameToActivityMap.put(packageName, activity);
+            }
+
+            final int lastShareIndex = historicalRecords.size() - 1;
+            float nextRecordWeight = 1;
+            for (int i = lastShareIndex; i >= 0; i--) {
+                HistoricalRecord historicalRecord = historicalRecords.get(i);
+                String packageName = historicalRecord.activity.getPackageName();
+                ActivityResolveInfo activity = packageNameToActivityMap.get(packageName);
+                if (activity != null) {
+                    activity.weight += historicalRecord.weight * nextRecordWeight;
+                    nextRecordWeight = nextRecordWeight * WEIGHT_DECAY_COEFFICIENT;
+                }
+            }
+
+            Collections.sort(activities);
+
+            if (DEBUG) {
+                for (int i = 0; i < activityCount; i++) {
+                    Log.i(LOG_TAG, "Sorted: " + activities.get(i));
+                }
+            }
+        }
+    }
+
+    /**
+     * Command for reading the historical records from a file off the UI thread.
+     */
+    private final class HistoryLoader implements Runnable {
+
+       public void run() {
+            FileInputStream fis = null;
+            try {
+                fis = mContext.openFileInput(mHistoryFileName);
+            } catch (FileNotFoundException fnfe) {
+                if (DEBUG) {
+                    Log.i(LOG_TAG, "Could not open historical records file: " + mHistoryFileName);
+                }
+                return;
+            }
+            try {
+                XmlPullParser parser = Xml.newPullParser();
+                parser.setInput(fis, null);
+
+                int type = XmlPullParser.START_DOCUMENT;
+                while (type != XmlPullParser.END_DOCUMENT && type != XmlPullParser.START_TAG) {
+                    type = parser.next();
+                }
+
+                if (!TAG_HISTORICAL_RECORDS.equals(parser.getName())) {
+                    throw new XmlPullParserException("Share records file does not start with "
+                            + TAG_HISTORICAL_RECORDS + " tag.");
+                }
+
+                List readRecords = new ArrayList();
+
+                while (true) {
+                    type = parser.next();
+                    if (type == XmlPullParser.END_DOCUMENT) {
+                        break;
+                    }
+                    if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
+                        continue;
+                    }
+                    String nodeName = parser.getName();
+                    if (!TAG_HISTORICAL_RECORD.equals(nodeName)) {
+                        throw new XmlPullParserException("Share records file not well-formed.");
+                    }
+
+                    String activity = parser.getAttributeValue(null, ATTRIBUTE_ACTIVITY);
+                    final long time =
+                        Long.parseLong(parser.getAttributeValue(null, ATTRIBUTE_TIME));
+                    final float weight =
+                        Float.parseFloat(parser.getAttributeValue(null, ATTRIBUTE_WEIGHT));
+
+                    HistoricalRecord readRecord = new HistoricalRecord(activity, time,
+                            weight);
+                    readRecords.add(readRecord);
+
+                    if (DEBUG) {
+                        Log.i(LOG_TAG, "Read " + readRecord.toString());
+                    }
+                }
+
+                if (DEBUG) {
+                    Log.i(LOG_TAG, "Read " + readRecords.size() + " historical records.");
+                }
+
+                synchronized (mInstanceLock) {
+                    Set uniqueShareRecords =
+                        new LinkedHashSet(readRecords);
+
+                    // Make sure no duplicates. Example: Read a file with
+                    // one record, add one record, persist the two records,
+                    // add a record, read the persisted records - the
+                    // read two records should not be added again.
+                    List historicalRecords = mHistoricalRecords;
+                    final int historicalRecordsCount = historicalRecords.size();
+                    for (int i = historicalRecordsCount - 1; i >= 0; i--) {
+                        HistoricalRecord historicalRecord = historicalRecords.get(i);
+                        uniqueShareRecords.add(historicalRecord);
+                    }
+
+                    if (historicalRecords.size() == uniqueShareRecords.size()) {
+                        return;
+                    }
+
+                    // Make sure the oldest records go to the end.
+                    historicalRecords.clear();
+                    historicalRecords.addAll(uniqueShareRecords);
+
+                    mHistoricalRecordsChanged = true;
+
+                    // Do this on the client thread since the client may be on the UI
+                    // thread, wait for data changes which happen during sorting, and
+                    // perform UI modification based on the data change.
+                    mHandler.post(new Runnable() {
+                        public void run() {
+                            pruneExcessiveHistoricalRecordsLocked();
+                            sortActivities();
+                        }
+                    });
+                }
+            } catch (XmlPullParserException xppe) {
+                Log.e(LOG_TAG, "Error reading historical recrod file: " + mHistoryFileName, xppe);
+            } catch (IOException ioe) {
+                Log.e(LOG_TAG, "Error reading historical recrod file: " + mHistoryFileName, ioe);
+            } finally {
+                if (fis != null) {
+                    try {
+                        fis.close();
+                    } catch (IOException ioe) {
+                        /* ignore */
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Command for persisting the historical records to a file off the UI thread.
+     */
+    private final class HistoryPersister implements Runnable {
+
+        public void run() {
+            FileOutputStream fos = null;
+            List records = null;
+
+            synchronized (mInstanceLock) {
+                records = new ArrayList(mHistoricalRecords);
+            }
+
+            try {
+                fos = mContext.openFileOutput(mHistoryFileName, Context.MODE_PRIVATE);
+            } catch (FileNotFoundException fnfe) {
+                Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, fnfe);
+                return;
+            }
+
+            XmlSerializer serializer = Xml.newSerializer();
+
+            try {
+                serializer.setOutput(fos, null);
+                serializer.startDocument("UTF-8", true);
+                serializer.startTag(null, TAG_HISTORICAL_RECORDS);
+
+                final int recordCount = records.size();
+                for (int i = 0; i < recordCount; i++) {
+                    HistoricalRecord record = records.remove(0);
+                    serializer.startTag(null, TAG_HISTORICAL_RECORD);
+                    serializer.attribute(null, ATTRIBUTE_ACTIVITY, record.activity.flattenToString());
+                    serializer.attribute(null, ATTRIBUTE_TIME, String.valueOf(record.time));
+                    serializer.attribute(null, ATTRIBUTE_WEIGHT, String.valueOf(record.weight));
+                    serializer.endTag(null, TAG_HISTORICAL_RECORD);
+                    if (DEBUG) {
+                        Log.i(LOG_TAG, "Wrote " + record.toString());
+                    }
+                }
+
+                serializer.endTag(null, TAG_HISTORICAL_RECORDS);
+                serializer.endDocument();
+
+                if (DEBUG) {
+                    Log.i(LOG_TAG, "Wrote " + recordCount + " historical records.");
+                }
+            } catch (IllegalArgumentException iae) {
+                Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, iae);
+            } catch (IllegalStateException ise) {
+                Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, ise);
+            } catch (IOException ioe) {
+                Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, ioe);
+            } finally {
+                if (fos != null) {
+                    try {
+                        fos.close();
+                    } catch (IOException e) {
+                        /* ignore */
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserView.java b/com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserView.java
new file mode 100644
index 000000000..da13bc99f
--- /dev/null
+++ b/com_actionbarsherlock/src/com/actionbarsherlock/widget/ActivityChooserView.java
@@ -0,0 +1,818 @@
+/*
+ * 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.widget;
+
+import android.os.Build;
+import com.actionbarsherlock.R;
+import com.actionbarsherlock.internal.widget.IcsLinearLayout;
+import com.actionbarsherlock.internal.widget.IcsListPopupWindow;
+import com.actionbarsherlock.view.ActionProvider;
+import com.actionbarsherlock.widget.ActivityChooserModel.ActivityChooserModelClient;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
+import android.database.DataSetObserver;
+import android.graphics.drawable.Drawable;
+import android.util.AttributeSet;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewTreeObserver;
+import android.view.ViewTreeObserver.OnGlobalLayoutListener;
+import android.widget.AdapterView;
+import android.widget.BaseAdapter;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+import android.widget.PopupWindow;
+import android.widget.TextView;
+
+/**
+ * This class is a view for choosing an activity for handling a given {@link Intent}.
+ * 

+ * The view is composed of two adjacent buttons:
+ * 
    
+ * 
  • 
+ * The left button is an immediate action and allows one click activity choosing.
+ * Tapping this button immediately executes the intent without requiring any further
+ * user input. Long press on this button shows a popup for changing the default
+ * activity.
+ * 
    • 
+ * 
  • 
+ * The right button is an overflow action and provides an optimized menu
+ * of additional activities. Tapping this button shows a popup anchored to this
+ * view, listing the most frequently used activities. This list is initially
+ * limited to a small number of items in frequency used order. The last item,
+ * "Show all..." serves as an affordance to display all available activities.
+ * 
    • 
+ * 

+ * 

+ *
+ * @hide
+ */
+class ActivityChooserView extends ViewGroup implements ActivityChooserModelClient {
+
+    /**
+     * An adapter for displaying the activities in an {@link AdapterView}.
+     */
+    private final ActivityChooserViewAdapter mAdapter;
+
+    /**
+     * Implementation of various interfaces to avoid publishing them in the APIs.
+     */
+    private final Callbacks mCallbacks;
+
+    /**
+     * The content of this view.
+     */
+    private final IcsLinearLayout mActivityChooserContent;
+
+    /**
+     * Stores the background drawable to allow hiding and latter showing.
+     */
+    private final Drawable mActivityChooserContentBackground;
+
+    /**
+     * The expand activities action button;
+     */
+    private final FrameLayout mExpandActivityOverflowButton;
+
+    /**
+     * The image for the expand activities action button;
+     */
+    private final ImageView mExpandActivityOverflowButtonImage;
+
+    /**
+     * The default activities action button;
+     */
+    private final FrameLayout mDefaultActivityButton;
+
+    /**
+     * The image for the default activities action button;
+     */
+    private final ImageView mDefaultActivityButtonImage;
+
+    /**
+     * The maximal width of the list popup.
+     */
+    private final int mListPopupMaxWidth;
+
+    /**
+     * The ActionProvider hosting this view, if applicable.
+     */
+    ActionProvider mProvider;
+
+    /**
+     * Observer for the model data.
+     */
+    private final DataSetObserver mModelDataSetOberver = new DataSetObserver() {
+
+        @Override
+        public void onChanged() {
+            super.onChanged();
+            mAdapter.notifyDataSetChanged();
+        }
+        @Override
+        public void onInvalidated() {
+            super.onInvalidated();
+            mAdapter.notifyDataSetInvalidated();
+        }
+    };
+
+    private final OnGlobalLayoutListener mOnGlobalLayoutListener = new OnGlobalLayoutListener() {
+        @Override
+        public void onGlobalLayout() {
+            if (isShowingPopup()) {
+                if (!isShown()) {
+                    getListPopupWindow().dismiss();
+                } else {
+                    getListPopupWindow().show();
+                    if (mProvider != null) {
+                        mProvider.subUiVisibilityChanged(true);
+                    }
+                }
+            }
+        }
+    };
+
+    /**
+     * Popup window for showing the activity overflow list.
+     */
+    private IcsListPopupWindow mListPopupWindow;
+
+    /**
+     * Listener for the dismissal of the popup/alert.
+     */
+    private PopupWindow.OnDismissListener mOnDismissListener;
+
+    /**
+     * Flag whether a default activity currently being selected.
+     */
+    private boolean mIsSelectingDefaultActivity;
+
+    /**
+     * The count of activities in the popup.
+     */
+    private int mInitialActivityCount = ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_DEFAULT;
+
+    /**
+     * Flag whether this view is attached to a window.
+     */
+    private boolean mIsAttachedToWindow;
+
+    /**
+     * String resource for formatting content description of the default target.
+     */
+    private int mDefaultActionButtonContentDescription;
+
+    private final Context mContext;
+
+    /**
+     * Create a new instance.
+     *
+     * @param context The application environment.
+     */
+    public ActivityChooserView(Context context) {
+        this(context, null);
+    }
+
+    /**
+     * Create a new instance.
+     *
+     * @param context The application environment.
+     * @param attrs A collection of attributes.
+     */
+    public ActivityChooserView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    /**
+     * Create a new instance.
+     *
+     * @param context The application environment.
+     * @param attrs A collection of attributes.
+     * @param defStyle The default style to apply to this view.
+     */
+    public ActivityChooserView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        mContext = context;
+
+        TypedArray attributesArray = context.obtainStyledAttributes(attrs,
+                R.styleable.SherlockActivityChooserView, defStyle, 0);
+
+        mInitialActivityCount = attributesArray.getInt(
+                R.styleable.SherlockActivityChooserView_initialActivityCount,
+                ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_DEFAULT);
+
+        Drawable expandActivityOverflowButtonDrawable = attributesArray.getDrawable(
+                R.styleable.SherlockActivityChooserView_expandActivityOverflowButtonDrawable);
+
+        attributesArray.recycle();
+
+        LayoutInflater inflater = LayoutInflater.from(mContext);
+        inflater.inflate(R.layout.abs__activity_chooser_view, this, true);
+
+        mCallbacks = new Callbacks();
+
+        mActivityChooserContent = (IcsLinearLayout) findViewById(R.id.abs__activity_chooser_view_content);
+        mActivityChooserContentBackground = mActivityChooserContent.getBackground();
+
+        mDefaultActivityButton = (FrameLayout) findViewById(R.id.abs__default_activity_button);
+        mDefaultActivityButton.setOnClickListener(mCallbacks);
+        mDefaultActivityButton.setOnLongClickListener(mCallbacks);
+        mDefaultActivityButtonImage = (ImageView) mDefaultActivityButton.findViewById(R.id.abs__image);
+
+        mExpandActivityOverflowButton = (FrameLayout) findViewById(R.id.abs__expand_activities_button);
+        mExpandActivityOverflowButton.setOnClickListener(mCallbacks);
+        mExpandActivityOverflowButtonImage =
+            (ImageView) mExpandActivityOverflowButton.findViewById(R.id.abs__image);
+        mExpandActivityOverflowButtonImage.setImageDrawable(expandActivityOverflowButtonDrawable);
+
+        mAdapter = new ActivityChooserViewAdapter();
+        mAdapter.registerDataSetObserver(new DataSetObserver() {
+            @Override
+            public void onChanged() {
+                super.onChanged();
+                updateAppearance();
+            }
+        });
+
+        Resources resources = context.getResources();
+        mListPopupMaxWidth = Math.max(resources.getDisplayMetrics().widthPixels / 2,
+              resources.getDimensionPixelSize(R.dimen.abs__config_prefDialogWidth));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void setActivityChooserModel(ActivityChooserModel dataModel) {
+        mAdapter.setDataModel(dataModel);
+        if (isShowingPopup()) {
+            dismissPopup();
+            showPopup();
+        }
+    }
+
+    /**
+     * Sets the background for the button that expands the activity
+     * overflow list.
+     *
+     * Note: Clients would like to set this drawable
+     * as a clue about the action the chosen activity will perform. For
+     * example, if a share activity is to be chosen the drawable should
+     * give a clue that sharing is to be performed.
+     *
+     * @param drawable The drawable.
+     */
+    public void setExpandActivityOverflowButtonDrawable(Drawable drawable) {
+        mExpandActivityOverflowButtonImage.setImageDrawable(drawable);
+    }
+
+    /**
+     * Sets the content description for the button that expands the activity
+     * overflow list.
+     *
+     * description as a clue about the action performed by the button.
+     * For example, if a share activity is to be chosen the content
+     * description should be something like "Share with".
+     *
+     * @param resourceId The content description resource id.
+     */
+    public void setExpandActivityOverflowButtonContentDescription(int resourceId) {
+        CharSequence contentDescription = mContext.getString(resourceId);
+        mExpandActivityOverflowButtonImage.setContentDescription(contentDescription);
+    }
+
+    /**
+     * Set the provider hosting this view, if applicable.
+     * @hide Internal use only
+     */
+    public void setProvider(ActionProvider provider) {
+        mProvider = provider;
+    }
+
+    /**
+     * Shows the popup window with activities.
+     *
+     * @return True if the popup was shown, false if already showing.
+     */
+    public boolean showPopup() {
+        if (isShowingPopup() || !mIsAttachedToWindow) {
+            return false;
+        }
+        mIsSelectingDefaultActivity = false;
+        showPopupUnchecked(mInitialActivityCount);
+        return true;
+    }
+
+    /**
+     * Shows the popup no matter if it was already showing.
+     *
+     * @param maxActivityCount The max number of activities to display.
+     */
+    private void showPopupUnchecked(int maxActivityCount) {
+        if (mAdapter.getDataModel() == null) {
+            throw new IllegalStateException("No data model. Did you call #setDataModel?");
+        }
+
+        getViewTreeObserver().addOnGlobalLayoutListener(mOnGlobalLayoutListener);
+
+        final boolean defaultActivityButtonShown =
+            mDefaultActivityButton.getVisibility() == VISIBLE;
+
+        final int activityCount = mAdapter.getActivityCount();
+        final int maxActivityCountOffset = defaultActivityButtonShown ? 1 : 0;
+        if (maxActivityCount != ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED
+                && activityCount > maxActivityCount + maxActivityCountOffset) {
+            mAdapter.setShowFooterView(true);
+            mAdapter.setMaxActivityCount(maxActivityCount - 1);
+        } else {
+            mAdapter.setShowFooterView(false);
+            mAdapter.setMaxActivityCount(maxActivityCount);
+        }
+
+        IcsListPopupWindow popupWindow = getListPopupWindow();
+        if (!popupWindow.isShowing()) {
+            if (mIsSelectingDefaultActivity || !defaultActivityButtonShown) {
+                mAdapter.setShowDefaultActivity(true, defaultActivityButtonShown);
+            } else {
+                mAdapter.setShowDefaultActivity(false, false);
+            }
+            final int contentWidth = Math.min(mAdapter.measureContentWidth(), mListPopupMaxWidth);
+            popupWindow.setContentWidth(contentWidth);
+            popupWindow.show();
+            if (mProvider != null) {
+                mProvider.subUiVisibilityChanged(true);
+            }
+            popupWindow.getListView().setContentDescription(mContext.getString(
+                    R.string.abs__activitychooserview_choose_application));
+        }
+    }
+
+    /**
+     * Dismisses the popup window with activities.
+     *
+     * @return True if dismissed, false if already dismissed.
+     */
+    public boolean dismissPopup() {
+        if (isShowingPopup()) {
+            getListPopupWindow().dismiss();
+            ViewTreeObserver viewTreeObserver = getViewTreeObserver();
+            if (viewTreeObserver.isAlive()) {
+                viewTreeObserver.removeGlobalOnLayoutListener(mOnGlobalLayoutListener);
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Gets whether the popup window with activities is shown.
+     *
+     * @return True if the popup is shown.
+     */
+    public boolean isShowingPopup() {
+        return getListPopupWindow().isShowing();
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        ActivityChooserModel dataModel = mAdapter.getDataModel();
+        if (dataModel != null) {
+            dataModel.registerObserver(mModelDataSetOberver);
+        }
+        mIsAttachedToWindow = true;
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        ActivityChooserModel dataModel = mAdapter.getDataModel();
+        if (dataModel != null) {
+            dataModel.unregisterObserver(mModelDataSetOberver);
+        }
+        ViewTreeObserver viewTreeObserver = getViewTreeObserver();
+        if (viewTreeObserver.isAlive()) {
+            viewTreeObserver.removeGlobalOnLayoutListener(mOnGlobalLayoutListener);
+        }
+        mIsAttachedToWindow = false;
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        View child = mActivityChooserContent;
+        // If the default action is not visible we want to be as tall as the
+        // ActionBar so if this widget is used in the latter it will look as
+        // a normal action button.
+        if (mDefaultActivityButton.getVisibility() != VISIBLE) {
+            heightMeasureSpec = MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(heightMeasureSpec),
+                    MeasureSpec.EXACTLY);
+        }
+        measureChild(child, widthMeasureSpec, heightMeasureSpec);
+        setMeasuredDimension(child.getMeasuredWidth(), child.getMeasuredHeight());
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        mActivityChooserContent.layout(0, 0, right - left, bottom - top);
+        if (getListPopupWindow().isShowing()) {
+            showPopupUnchecked(mAdapter.getMaxActivityCount());
+        } else {
+            dismissPopup();
+        }
+    }
+
+    public ActivityChooserModel getDataModel() {
+        return mAdapter.getDataModel();
+    }
+
+    /**
+     * Sets a listener to receive a callback when the popup is dismissed.
+     *
+     * @param listener The listener to be notified.
+     */
+    public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
+        mOnDismissListener = listener;
+    }
+
+    /**
+     * Sets the initial count of items shown in the activities popup
+     * i.e. the items before the popup is expanded. This is an upper
+     * bound since it is not guaranteed that such number of intent
+     * handlers exist.
+     *
+     * @param itemCount The initial popup item count.
+     */
+    public void setInitialActivityCount(int itemCount) {
+        mInitialActivityCount = itemCount;
+    }
+
+    /**
+     * Sets a content description of the default action button. This
+     * resource should be a string taking one formatting argument and
+     * will be used for formatting the content description of the button
+     * dynamically as the default target changes. For example, a resource
+     * pointing to the string "share with %1$s" will result in a content
+     * description "share with Bluetooth" for the Bluetooth activity.
+     *
+     * @param resourceId The resource id.
+     */
+    public void setDefaultActionButtonContentDescription(int resourceId) {
+        mDefaultActionButtonContentDescription = resourceId;
+    }
+
+    /**
+     * Gets the list popup window which is lazily initialized.
+     *
+     * @return The popup.
+     */
+    private IcsListPopupWindow getListPopupWindow() {
+        if (mListPopupWindow == null) {
+            mListPopupWindow = new IcsListPopupWindow(getContext());
+            mListPopupWindow.setAdapter(mAdapter);
+            mListPopupWindow.setAnchorView(ActivityChooserView.this);
+            mListPopupWindow.setModal(true);
+            mListPopupWindow.setOnItemClickListener(mCallbacks);
+            mListPopupWindow.setOnDismissListener(mCallbacks);
+        }
+        return mListPopupWindow;
+    }
+
+    /**
+     * Updates the buttons state.
+     */
+    private void updateAppearance() {
+        // Expand overflow button.
+        if (mAdapter.getCount() > 0) {
+            mExpandActivityOverflowButton.setEnabled(true);
+        } else {
+            mExpandActivityOverflowButton.setEnabled(false);
+        }
+        // Default activity button.
+        final int activityCount = mAdapter.getActivityCount();
+        final int historySize = mAdapter.getHistorySize();
+        if (activityCount > 0 && historySize > 0) {
+            mDefaultActivityButton.setVisibility(VISIBLE);
+            ResolveInfo activity = mAdapter.getDefaultActivity();
+            PackageManager packageManager = mContext.getPackageManager();
+            mDefaultActivityButtonImage.setImageDrawable(activity.loadIcon(packageManager));
+            if (mDefaultActionButtonContentDescription != 0) {
+                CharSequence label = activity.loadLabel(packageManager);
+                String contentDescription = mContext.getString(
+                        mDefaultActionButtonContentDescription, label);
+                mDefaultActivityButton.setContentDescription(contentDescription);
+            }
+        } else {
+            mDefaultActivityButton.setVisibility(View.GONE);
+        }
+        // Activity chooser content.
+        if (mDefaultActivityButton.getVisibility() == VISIBLE) {
+            mActivityChooserContent.setBackgroundDrawable(mActivityChooserContentBackground);
+        } else {
+            mActivityChooserContent.setBackgroundDrawable(null);
+        }
+    }
+
+    /**
+     * Interface implementation to avoid publishing them in the APIs.
+     */
+    private class Callbacks implements AdapterView.OnItemClickListener,
+            View.OnClickListener, View.OnLongClickListener, PopupWindow.OnDismissListener {
+
+        // AdapterView#OnItemClickListener
+        public void onItemClick(AdapterView parent, View view, int position, long id) {
+            ActivityChooserViewAdapter adapter = (ActivityChooserViewAdapter) parent.getAdapter();
+            final int itemViewType = adapter.getItemViewType(position);
+            switch (itemViewType) {
+                case ActivityChooserViewAdapter.ITEM_VIEW_TYPE_FOOTER: {
+                    showPopupUnchecked(ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED);
+                } break;
+                case ActivityChooserViewAdapter.ITEM_VIEW_TYPE_ACTIVITY: {
+                    dismissPopup();
+                    if (mIsSelectingDefaultActivity) {
+                        // The item at position zero is the default already.
+                        if (position > 0) {
+                            mAdapter.getDataModel().setDefaultActivity(position);
+                        }
+                    } else {
+                        // If the default target is not shown in the list, the first
+                        // item in the model is default action => adjust index
+                        position = mAdapter.getShowDefaultActivity() ? position : position + 1;
+                        Intent launchIntent = mAdapter.getDataModel().chooseActivity(position);
+                        if (launchIntent != null) {
+                            mContext.startActivity(launchIntent);
+                        }
+                    }
+                } break;
+                default:
+                    throw new IllegalArgumentException();
+            }
+        }
+
+        // View.OnClickListener
+        public void onClick(View view) {
+            if (view == mDefaultActivityButton) {
+                dismissPopup();
+                ResolveInfo defaultActivity = mAdapter.getDefaultActivity();
+                final int index = mAdapter.getDataModel().getActivityIndex(defaultActivity);
+                Intent launchIntent = mAdapter.getDataModel().chooseActivity(index);
+                if (launchIntent != null) {
+                    mContext.startActivity(launchIntent);
+                }
+            } else if (view == mExpandActivityOverflowButton) {
+                mIsSelectingDefaultActivity = false;
+                showPopupUnchecked(mInitialActivityCount);
+            } else {
+                throw new IllegalArgumentException();
+            }
+        }
+
+        // OnLongClickListener#onLongClick
+        @Override
+        public boolean onLongClick(View view) {
+            if (view == mDefaultActivityButton) {
+                if (mAdapter.getCount() > 0) {
+                    mIsSelectingDefaultActivity = true;
+                    showPopupUnchecked(mInitialActivityCount);
+                }
+            } else {
+                throw new IllegalArgumentException();
+            }
+            return true;
+        }
+
+        // PopUpWindow.OnDismissListener#onDismiss
+        public void onDismiss() {
+            notifyOnDismissListener();
+            if (mProvider != null) {
+                mProvider.subUiVisibilityChanged(false);
+            }
+        }
+
+        private void notifyOnDismissListener() {
+            if (mOnDismissListener != null) {
+                mOnDismissListener.onDismiss();
+            }
+        }
+    }
+
+    private static class SetActivated {
+        public static void invoke(View view, boolean activated) {
+            view.setActivated(activated);
+        }
+    }
+
+    private static final boolean IS_HONEYCOMB = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
+
+    /**
+     * Adapter for backing the list of activities shown in the popup.
+     */
+    private class ActivityChooserViewAdapter extends BaseAdapter {
+
+        public static final int MAX_ACTIVITY_COUNT_UNLIMITED = Integer.MAX_VALUE;
+
+        public static final int MAX_ACTIVITY_COUNT_DEFAULT = 4;
+
+        private static final int ITEM_VIEW_TYPE_ACTIVITY = 0;
+
+        private static final int ITEM_VIEW_TYPE_FOOTER = 1;
+
+        private static final int ITEM_VIEW_TYPE_COUNT = 3;
+
+        private ActivityChooserModel mDataModel;
+
+        private int mMaxActivityCount = MAX_ACTIVITY_COUNT_DEFAULT;
+
+        private boolean mShowDefaultActivity;
+
+        private boolean mHighlightDefaultActivity;
+
+        private boolean mShowFooterView;
+
+        public void setDataModel(ActivityChooserModel dataModel) {
+            ActivityChooserModel oldDataModel = mAdapter.getDataModel();
+            if (oldDataModel != null && isShown()) {
+                oldDataModel.unregisterObserver(mModelDataSetOberver);
+            }
+            mDataModel = dataModel;
+            if (dataModel != null && isShown()) {
+                dataModel.registerObserver(mModelDataSetOberver);
+            }
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public int getItemViewType(int position) {
+            if (mShowFooterView && position == getCount() - 1) {
+                return ITEM_VIEW_TYPE_FOOTER;
+            } else {
+                return ITEM_VIEW_TYPE_ACTIVITY;
+            }
+        }
+
+        @Override
+        public int getViewTypeCount() {
+            return ITEM_VIEW_TYPE_COUNT;
+        }
+
+        public int getCount() {
+            int count = 0;
+            int activityCount = mDataModel.getActivityCount();
+            if (!mShowDefaultActivity && mDataModel.getDefaultActivity() != null) {
+                activityCount--;
+            }
+            count = Math.min(activityCount, mMaxActivityCount);
+            if (mShowFooterView) {
+                count++;
+            }
+            return count;
+        }
+
+        public Object getItem(int position) {
+            final int itemViewType = getItemViewType(position);
+            switch (itemViewType) {
+                case ITEM_VIEW_TYPE_FOOTER:
+                    return null;
+                case ITEM_VIEW_TYPE_ACTIVITY:
+                    if (!mShowDefaultActivity && mDataModel.getDefaultActivity() != null) {
+                        position++;
+                    }
+                    return mDataModel.getActivity(position);
+                default:
+                    throw new IllegalArgumentException();
+            }
+        }
+
+        public long getItemId(int position) {
+            return position;
+        }
+
+        public View getView(int position, View convertView, ViewGroup parent) {
+            final int itemViewType = getItemViewType(position);
+            switch (itemViewType) {
+                case ITEM_VIEW_TYPE_FOOTER:
+                    if (convertView == null || convertView.getId() != ITEM_VIEW_TYPE_FOOTER) {
+                        convertView = LayoutInflater.from(getContext()).inflate(
+                                R.layout.abs__activity_chooser_view_list_item, parent, false);
+                        convertView.setId(ITEM_VIEW_TYPE_FOOTER);
+                        TextView titleView = (TextView) convertView.findViewById(R.id.abs__title);
+                        titleView.setText(mContext.getString(
+                                R.string.abs__activity_chooser_view_see_all));
+                    }
+                    return convertView;
+                case ITEM_VIEW_TYPE_ACTIVITY:
+                    if (convertView == null || convertView.getId() != R.id.abs__list_item) {
+                        convertView = LayoutInflater.from(getContext()).inflate(
+                                R.layout.abs__activity_chooser_view_list_item, parent, false);
+                    }
+                    PackageManager packageManager = mContext.getPackageManager();
+                    // Set the icon
+                    ImageView iconView = (ImageView) convertView.findViewById(R.id.abs__icon);
+                    ResolveInfo activity = (ResolveInfo) getItem(position);
+                    iconView.setImageDrawable(activity.loadIcon(packageManager));
+                    // Set the title.
+                    TextView titleView = (TextView) convertView.findViewById(R.id.abs__title);
+                    titleView.setText(activity.loadLabel(packageManager));
+                    if (IS_HONEYCOMB) {
+                        // Highlight the default.
+                        if (mShowDefaultActivity && position == 0 && mHighlightDefaultActivity) {
+                            SetActivated.invoke(convertView, true);
+                        } else {
+                            SetActivated.invoke(convertView, false);
+                        }
+                    }
+                    return convertView;
+                default:
+                    throw new IllegalArgumentException();
+            }
+        }
+
+        public int measureContentWidth() {
+            // The user may have specified some of the target not to be shown but we
+            // want to measure all of them since after expansion they should fit.
+            final int oldMaxActivityCount = mMaxActivityCount;
+            mMaxActivityCount = MAX_ACTIVITY_COUNT_UNLIMITED;
+
+            int contentWidth = 0;
+            View itemView = null;
+
+            final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
+            final int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
+            final int count = getCount();
+
+            for (int i = 0; i < count; i++) {
+                itemView = getView(i, itemView, null);
+                itemView.measure(widthMeasureSpec, heightMeasureSpec);
+                contentWidth = Math.max(contentWidth, itemView.getMeasuredWidth());
+            }
+
+            mMaxActivityCount = oldMaxActivityCount;
+
+            return contentWidth;
+        }
+
+        public void setMaxActivityCount(int maxActivityCount) {
+            if (mMaxActivityCount != maxActivityCount) {
+                mMaxActivityCount = maxActivityCount;
+                notifyDataSetChanged();
+            }
+        }
+
+        public ResolveInfo getDefaultActivity() {
+            return mDataModel.getDefaultActivity();
+        }
+
+        public void setShowFooterView(boolean showFooterView) {
+            if (mShowFooterView != showFooterView) {
+                mShowFooterView = showFooterView;
+                notifyDataSetChanged();
+            }
+        }
+
+        public int getActivityCount() {
+            return mDataModel.getActivityCount();
+        }
+
+        public int getHistorySize() {
+            return mDataModel.getHistorySize();
+        }
+
+        public int getMaxActivityCount() {
+            return mMaxActivityCount;
+        }
+
+        public ActivityChooserModel getDataModel() {
+            return mDataModel;
+        }
+
+        public void setShowDefaultActivity(boolean showDefaultActivity,
+                boolean highlightDefaultActivity) {
+            if (mShowDefaultActivity != showDefaultActivity
+                    || mHighlightDefaultActivity != highlightDefaultActivity) {
+                mShowDefaultActivity = showDefaultActivity;
+                mHighlightDefaultActivity = highlightDefaultActivity;
+                notifyDataSetChanged();
+            }
+        }
+
+        public boolean getShowDefaultActivity() {
+            return mShowDefaultActivity;
+        }
+    }
+}
diff --git a/com_actionbarsherlock/src/com/actionbarsherlock/widget/ShareActionProvider.java b/com_actionbarsherlock/src/com/actionbarsherlock/widget/ShareActionProvider.java
new file mode 100644
index 000000000..83e9f0ca9
--- /dev/null
+++ b/com_actionbarsherlock/src/com/actionbarsherlock/widget/ShareActionProvider.java
@@ -0,0 +1,316 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.graphics.drawable.Drawable;
+import android.util.TypedValue;
+import android.view.View;
+
+import com.actionbarsherlock.R;
+import com.actionbarsherlock.view.ActionProvider;
+import com.actionbarsherlock.view.Menu;
+import com.actionbarsherlock.view.MenuItem;
+import com.actionbarsherlock.view.MenuItem.OnMenuItemClickListener;
+import com.actionbarsherlock.view.SubMenu;
+import com.actionbarsherlock.widget.ActivityChooserModel.OnChooseActivityListener;
+
+/**
+ * This is a provider for a share action. It is responsible for creating views
+ * that enable data sharing and also to show a sub menu with sharing activities
+ * if the hosting item is placed on the overflow menu.
+ * 

+ * Here is how to use the action provider with custom backing file in a {@link MenuItem}:
+ * 

+ * 

+ * 
+ * 
+ *  // In Activity#onCreateOptionsMenu
+ *  public boolean onCreateOptionsMenu(Menu menu) {
+ *      // Get the menu item.
+ *      MenuItem menuItem = menu.findItem(R.id.my_menu_item);
+ *      // Get the provider and hold onto it to set/change the share intent.
+ *      mShareActionProvider = (ShareActionProvider) menuItem.getActionProvider();
+ *      // Set history different from the default before getting the action
+ *      // view since a call to {@link MenuItem#getActionView() MenuItem.getActionView()} calls
+ *      // {@link ActionProvider#onCreateActionView()} which uses the backing file name. Omit this
+ *      // line if using the default share history file is desired.
+ *      mShareActionProvider.setShareHistoryFileName("custom_share_history.xml");
+ *      . . .
+ *  }
+ *
+ *  // Somewhere in the application.
+ *  public void doShare(Intent shareIntent) {
+ *      // When you want to share set the share intent.
+ *      mShareActionProvider.setShareIntent(shareIntent);
+ *  }
+ * 

+ * 
+ * 

+ * 

+ * Note: While the sample snippet demonstrates how to use this provider
+ * in the context of a menu item, the use of the provider is not limited to menu items.
+ * 

+ *
+ * @see ActionProvider
+ */
+public class ShareActionProvider extends ActionProvider {
+
+    /**
+     * Listener for the event of selecting a share target.
+     */
+    public interface OnShareTargetSelectedListener {
+
+        /**
+         * Called when a share target has been selected. The client can
+         * decide whether to handle the intent or rely on the default
+         * behavior which is launching it.
+         * 

+         * Note: Modifying the intent is not permitted and
+         *     any changes to the latter will be ignored.
+         * 

+         *
+         * @param source The source of the notification.
+         * @param intent The intent for launching the chosen share target.
+         * @return Whether the client has handled the intent.
+         */
+        public boolean onShareTargetSelected(ShareActionProvider source, Intent intent);
+    }
+
+    /**
+     * The default for the maximal number of activities shown in the sub-menu.
+     */
+    private static final int DEFAULT_INITIAL_ACTIVITY_COUNT = 4;
+
+    /**
+     * The the maximum number activities shown in the sub-menu.
+     */
+    private int mMaxShownActivityCount = DEFAULT_INITIAL_ACTIVITY_COUNT;
+
+    /**
+     * Listener for handling menu item clicks.
+     */
+    private final ShareMenuItemOnMenuItemClickListener mOnMenuItemClickListener =
+        new ShareMenuItemOnMenuItemClickListener();
+
+    /**
+     * The default name for storing share history.
+     */
+    public static final String DEFAULT_SHARE_HISTORY_FILE_NAME = "share_history.xml";
+
+    /**
+     * Context for accessing resources.
+     */
+    private final Context mContext;
+
+    /**
+     * The name of the file with share history data.
+     */
+    private String mShareHistoryFileName = DEFAULT_SHARE_HISTORY_FILE_NAME;
+
+    private OnShareTargetSelectedListener mOnShareTargetSelectedListener;
+
+    private OnChooseActivityListener mOnChooseActivityListener;
+
+    /**
+     * Creates a new instance.
+     *
+     * @param context Context for accessing resources.
+     */
+    public ShareActionProvider(Context context) {
+        super(context);
+        mContext = context;
+    }
+
+    /**
+     * Sets a listener to be notified when a share target has been selected.
+     * The listener can optionally decide to handle the selection and
+     * not rely on the default behavior which is to launch the activity.
+     * 

+     * Note: If you choose the backing share history file
+     *     you will still be notified in this callback.
+     * 

+     * @param listener The listener.
+     */
+    public void setOnShareTargetSelectedListener(OnShareTargetSelectedListener listener) {
+        mOnShareTargetSelectedListener = listener;
+        setActivityChooserPolicyIfNeeded();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public View onCreateActionView() {
+        // Create the view and set its data model.
+        ActivityChooserModel dataModel = ActivityChooserModel.get(mContext, mShareHistoryFileName);
+        ActivityChooserView activityChooserView = new ActivityChooserView(mContext);
+        activityChooserView.setActivityChooserModel(dataModel);
+
+        // Lookup and set the expand action icon.
+        TypedValue outTypedValue = new TypedValue();
+        mContext.getTheme().resolveAttribute(R.attr.actionModeShareDrawable, outTypedValue, true);
+        Drawable drawable = mContext.getResources().getDrawable(outTypedValue.resourceId);
+        activityChooserView.setExpandActivityOverflowButtonDrawable(drawable);
+        activityChooserView.setProvider(this);
+
+        // Set content description.
+        activityChooserView.setDefaultActionButtonContentDescription(
+                R.string.abs__shareactionprovider_share_with_application);
+        activityChooserView.setExpandActivityOverflowButtonContentDescription(
+                R.string.abs__shareactionprovider_share_with);
+
+        return activityChooserView;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean hasSubMenu() {
+        return true;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void onPrepareSubMenu(SubMenu subMenu) {
+        // Clear since the order of items may change.
+        subMenu.clear();
+
+        ActivityChooserModel dataModel = ActivityChooserModel.get(mContext, mShareHistoryFileName);
+        PackageManager packageManager = mContext.getPackageManager();
+
+        final int expandedActivityCount = dataModel.getActivityCount();
+        final int collapsedActivityCount = Math.min(expandedActivityCount, mMaxShownActivityCount);
+
+        // Populate the sub-menu with a sub set of the activities.
+        for (int i = 0; i < collapsedActivityCount; i++) {
+            ResolveInfo activity = dataModel.getActivity(i);
+            subMenu.add(0, i, i, activity.loadLabel(packageManager))
+                .setIcon(activity.loadIcon(packageManager))
+                .setOnMenuItemClickListener(mOnMenuItemClickListener);
+        }
+
+        if (collapsedActivityCount < expandedActivityCount) {
+            // Add a sub-menu for showing all activities as a list item.
+            SubMenu expandedSubMenu = subMenu.addSubMenu(Menu.NONE, collapsedActivityCount,
+                    collapsedActivityCount,
+                    mContext.getString(R.string.abs__activity_chooser_view_see_all));
+            for (int i = 0; i < expandedActivityCount; i++) {
+                ResolveInfo activity = dataModel.getActivity(i);
+                expandedSubMenu.add(0, i, i, activity.loadLabel(packageManager))
+                    .setIcon(activity.loadIcon(packageManager))
+                    .setOnMenuItemClickListener(mOnMenuItemClickListener);
+            }
+        }
+    }
+
+    /**
+     * Sets the file name of a file for persisting the share history which
+     * history will be used for ordering share targets. This file will be used
+     * for all view created by {@link #onCreateActionView()}. Defaults to
+     * {@link #DEFAULT_SHARE_HISTORY_FILE_NAME}. Set to null
+     * if share history should not be persisted between sessions.
+     * 

+     * Note: The history file name can be set any time, however
+     * only the action views created by {@link #onCreateActionView()} after setting
+     * the file name will be backed by the provided file.
+     * 

+     *
+     * @param shareHistoryFile The share history file name.
+     */
+    public void setShareHistoryFileName(String shareHistoryFile) {
+        mShareHistoryFileName = shareHistoryFile;
+        setActivityChooserPolicyIfNeeded();
+    }
+
+    /**
+     * Sets an intent with information about the share action. Here is a
+     * sample for constructing a share intent:
+     * 

+     * 
+     * 
+     *  Intent shareIntent = new Intent(Intent.ACTION_SEND);
+     *  shareIntent.setType("image/*");
+     *  Uri uri = Uri.fromFile(new File(getFilesDir(), "foo.jpg"));
+     *  shareIntent.putExtra(Intent.EXTRA_STREAM, uri.toString());
+     * 

+     * 
+     * 

+     *
+     * @param shareIntent The share intent.
+     *
+     * @see Intent#ACTION_SEND
+     * @see Intent#ACTION_SEND_MULTIPLE
+     */
+    public void setShareIntent(Intent shareIntent) {
+        ActivityChooserModel dataModel = ActivityChooserModel.get(mContext,
+            mShareHistoryFileName);
+        dataModel.setIntent(shareIntent);
+    }
+
+    /**
+     * Reusable listener for handling share item clicks.
+     */
+    private class ShareMenuItemOnMenuItemClickListener implements OnMenuItemClickListener {
+        @Override
+        public boolean onMenuItemClick(MenuItem item) {
+            ActivityChooserModel dataModel = ActivityChooserModel.get(mContext,
+                    mShareHistoryFileName);
+            final int itemId = item.getItemId();
+            Intent launchIntent = dataModel.chooseActivity(itemId);
+            if (launchIntent != null) {
+                mContext.startActivity(launchIntent);
+            }
+            return true;
+        }
+    }
+
+    /**
+     * Set the activity chooser policy of the model backed by the current
+     * share history file if needed which is if there is a registered callback.
+     */
+    private void setActivityChooserPolicyIfNeeded() {
+        if (mOnShareTargetSelectedListener == null) {
+            return;
+        }
+        if (mOnChooseActivityListener == null) {
+            mOnChooseActivityListener = new ShareAcitivityChooserModelPolicy();
+        }
+        ActivityChooserModel dataModel = ActivityChooserModel.get(mContext, mShareHistoryFileName);
+        dataModel.setOnChooseActivityListener(mOnChooseActivityListener);
+    }
+
+    /**
+     * Policy that delegates to the {@link OnShareTargetSelectedListener}, if such.
+     */
+    private class ShareAcitivityChooserModelPolicy implements OnChooseActivityListener {
+        @Override
+        public boolean onChooseActivity(ActivityChooserModel host, Intent intent) {
+            if (mOnShareTargetSelectedListener != null) {
+                return mOnShareTargetSelectedListener.onShareTargetSelected(
+                        ShareActionProvider.this, intent);
+            }
+            return false;
+        }
+    }
+}
-- 
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