public class

ActivityChooserView

extends ViewGroup

implements androidx.appcompat.widget.ActivityChooserModel.ActivityChooserModelClient

 java.lang.Object

↳ViewGroup

↳androidx.appcompat.widget.ActivityChooserView

Gradle dependencies

compile group: 'androidx.appcompat', name: 'appcompat', version: '1.7.0'

  • groupId: androidx.appcompat
  • artifactId: appcompat
  • version: 1.7.0

Artifact androidx.appcompat:appcompat:1.7.0 it located at Google repository (https://maven.google.com/)

Androidx artifact mapping:

androidx.appcompat:appcompat com.android.support:appcompat-v7

Androidx class mapping:

androidx.appcompat.widget.ActivityChooserView android.support.v7.widget.ActivityChooserView

Overview

This class is a view for choosing an activity for handling a given .

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.

Summary

Constructors
publicActivityChooserView(Context context)

Create a new instance.

publicActivityChooserView(Context context, AttributeSet attrs)

Create a new instance.

publicActivityChooserView(Context context, AttributeSet attrs, int defStyle)

Create a new instance.

Methods
public booleandismissPopup()

Dismisses the popup window with activities.

public androidx.appcompat.widget.ActivityChooserModelgetDataModel()

public booleanisShowingPopup()

Gets whether the popup window with activities is shown.

protected voidonAttachedToWindow()

protected voidonDetachedFromWindow()

protected voidonLayout(boolean changed, int left, int top, int right, int bottom)

protected voidonMeasure(int widthMeasureSpec, int heightMeasureSpec)

public voidsetActivityChooserModel(androidx.appcompat.widget.ActivityChooserModel dataModel)

public voidsetDefaultActionButtonContentDescription(int resourceId)

Sets a content description of the default action button.

public voidsetExpandActivityOverflowButtonContentDescription(int resourceId)

Sets the content description for the button that expands the activity overflow list.

public voidsetExpandActivityOverflowButtonDrawable(Drawable drawable)

Sets the background for the button that expands the activity overflow list.

public voidsetInitialActivityCount(int itemCount)

Sets the initial count of items shown in the activities popup i.e.

public voidsetOnDismissListener(PopupWindow.OnDismissListener listener)

Sets a listener to receive a callback when the popup is dismissed.

public voidsetProvider(ActionProvider provider)

Set the provider hosting this view, if applicable.

public booleanshowPopup()

Shows the popup window with activities.

from java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

public ActivityChooserView(Context context)

Create a new instance.

Parameters:

context: The application environment.

public ActivityChooserView(Context context, AttributeSet attrs)

Create a new instance.

Parameters:

context: The application environment.
attrs: A collection of attributes.

public ActivityChooserView(Context context, AttributeSet attrs, int defStyle)

Create a new instance.

Parameters:

context: The application environment.
attrs: A collection of attributes.
defStyle: The default style to apply to this view.

Methods

public void setActivityChooserModel(androidx.appcompat.widget.ActivityChooserModel dataModel)

public void setExpandActivityOverflowButtonDrawable(Drawable drawable)

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.

Parameters:

drawable: The drawable.

public void setExpandActivityOverflowButtonContentDescription(int resourceId)

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".

Parameters:

resourceId: The content description resource id.

public void setProvider(ActionProvider provider)

Set the provider hosting this view, if applicable.

public boolean showPopup()

Shows the popup window with activities.

Returns:

True if the popup was shown, false if already showing.

public boolean dismissPopup()

Dismisses the popup window with activities.

Returns:

True if dismissed, false if already dismissed.

public boolean isShowingPopup()

Gets whether the popup window with activities is shown.

Returns:

True if the popup is shown.

protected void onAttachedToWindow()

protected void onDetachedFromWindow()

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

protected void onLayout(boolean changed, int left, int top, int right, int bottom)

public androidx.appcompat.widget.ActivityChooserModel getDataModel()

public void setOnDismissListener(PopupWindow.OnDismissListener listener)

Sets a listener to receive a callback when the popup is dismissed.

Parameters:

listener: The listener to be notified.

public void setInitialActivityCount(int itemCount)

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.

Parameters:

itemCount: The initial popup item count.

public void setDefaultActionButtonContentDescription(int resourceId)

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.

Parameters:

resourceId: The resource id.

Source

/*
 * Copyright (C) 2013 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 androidx.appcompat.widget;

import static androidx.annotation.RestrictTo.Scope.LIBRARY;
import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP_PREFIX;

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.Color;
import android.graphics.drawable.ColorDrawable;
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.view.accessibility.AccessibilityNodeInfo;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.appcompat.R;
import androidx.appcompat.view.menu.ShowableListMenu;
import androidx.core.view.ActionProvider;
import androidx.core.view.ViewCompat;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;

/**
 * This class is a view for choosing an activity for handling a given {@link Intent}.
 * <p>
 * The view is composed of two adjacent buttons:
 * <ul>
 * <li>
 * 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.
 * </li>
 * <li>
 * 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.
 * </li>
 * </ul>
 * </p>
 *
 */
@RestrictTo(LIBRARY_GROUP_PREFIX)
public class ActivityChooserView extends ViewGroup implements
        ActivityChooserModel.ActivityChooserModelClient {
    /**
     * An adapter for displaying the activities in an {@link android.widget.AdapterView}.
     */
    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 View mActivityChooserContent;

    /**
     * Stores the background drawable to allow hiding and latter showing.
     */
    private final Drawable mActivityChooserContentBackground;

    /**
     * The expand activities action button;
     */
    final FrameLayout mExpandActivityOverflowButton;

    /**
     * The image for the expand activities action button;
     */
    private final ImageView mExpandActivityOverflowButtonImage;

    /**
     * The default activities action button;
     */
    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.
     */
    final DataSetObserver mModelDataSetObserver = 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 ListPopupWindow mListPopupWindow;

    /**
     * Listener for the dismissal of the popup/alert.
     */
    PopupWindow.OnDismissListener mOnDismissListener;

    /**
     * Flag whether a default activity currently being selected.
     */
    boolean mIsSelectingDefaultActivity;

    /**
     * The count of activities in the popup.
     */
    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;

    /**
     * Create a new instance.
     *
     * @param context The application environment.
     */
    public ActivityChooserView(@NonNull Context context) {
        this(context, null);
    }

    /**
     * Create a new instance.
     *
     * @param context The application environment.
     * @param attrs A collection of attributes.
     */
    public ActivityChooserView(@NonNull Context context, @Nullable 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(
            @NonNull Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        TypedArray attributesArray = context.obtainStyledAttributes(attrs,
                R.styleable.ActivityChooserView, defStyle, 0);
        ViewCompat.saveAttributeDataForStyleable(this, context,
                R.styleable.ActivityChooserView, attrs, attributesArray, defStyle, 0);

        mInitialActivityCount = attributesArray.getInt(
                R.styleable.ActivityChooserView_initialActivityCount,
                ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_DEFAULT);

        Drawable expandActivityOverflowButtonDrawable = attributesArray.getDrawable(
                R.styleable.ActivityChooserView_expandActivityOverflowButtonDrawable);

        attributesArray.recycle();

        LayoutInflater inflater = LayoutInflater.from(getContext());
        inflater.inflate(R.layout.abc_activity_chooser_view, this, true);

        mCallbacks = new Callbacks();

        mActivityChooserContent = findViewById(R.id.activity_chooser_view_content);
        mActivityChooserContentBackground = mActivityChooserContent.getBackground();

        mDefaultActivityButton = findViewById(R.id.default_activity_button);
        mDefaultActivityButton.setOnClickListener(mCallbacks);
        mDefaultActivityButton.setOnLongClickListener(mCallbacks);
        mDefaultActivityButtonImage = (ImageView) mDefaultActivityButton.findViewById(R.id.image);

        final FrameLayout expandButton = findViewById(R.id.expand_activities_button);
        expandButton.setOnClickListener(mCallbacks);
        expandButton.setAccessibilityDelegate(new AccessibilityDelegate() {
            @Override
            public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
                super.onInitializeAccessibilityNodeInfo(host, info);
                AccessibilityNodeInfoCompat.wrap(info).setCanOpenPopup(true);
            }
        });
        expandButton.setOnTouchListener(new ForwardingListener(expandButton) {
            @Override
            public ShowableListMenu getPopup() {
                return getListPopupWindow();
            }

            @Override
            protected boolean onForwardingStarted() {
                showPopup();
                return true;
            }

            @Override
            protected boolean onForwardingStopped() {
                dismissPopup();
                return true;
            }
        });
        mExpandActivityOverflowButton = expandButton;
        mExpandActivityOverflowButtonImage =
            (ImageView) expandButton.findViewById(R.id.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.abc_config_prefDialogWidth));
    }

    /**
     * {@inheritDoc}
     */
    @RestrictTo(LIBRARY)
    @Override
    public void setActivityChooserModel(ActivityChooserModel dataModel) {
        mAdapter.setDataModel(dataModel);
        if (isShowingPopup()) {
            dismissPopup();
            showPopup();
        }
    }

    /**
     * Sets the background for the button that expands the activity
     * overflow list.
     *
     * <strong>Note:</strong> 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 = getContext().getString(resourceId);
        mExpandActivityOverflowButtonImage.setContentDescription(contentDescription);
    }

    /**
     * Set the provider hosting this view, if applicable.
     */
    @RestrictTo(LIBRARY_GROUP_PREFIX)
    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.
     */
    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);
        }

        ListPopupWindow 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(getContext().getString(
                    R.string.abc_activitychooserview_choose_application));
            popupWindow.getListView().setSelector(new ColorDrawable(Color.TRANSPARENT));
        }
    }

    /**
     * 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(mModelDataSetObserver);
        }
        mIsAttachedToWindow = true;
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        ActivityChooserModel dataModel = mAdapter.getDataModel();
        if (dataModel != null) {
            dataModel.unregisterObserver(mModelDataSetObserver);
        }
        ViewTreeObserver viewTreeObserver = getViewTreeObserver();
        if (viewTreeObserver.isAlive()) {
            viewTreeObserver.removeGlobalOnLayoutListener(mOnGlobalLayoutListener);
        }
        if (isShowingPopup()) {
            dismissPopup();
        }
        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 (!isShowingPopup()) {
            dismissPopup();
        }
    }

    /**
     */
    @RestrictTo(LIBRARY)
    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.
     */
    ListPopupWindow getListPopupWindow() {
        if (mListPopupWindow == null) {
            mListPopupWindow = new ListPopupWindow(getContext());
            mListPopupWindow.setAdapter(mAdapter);
            mListPopupWindow.setAnchorView(ActivityChooserView.this);
            mListPopupWindow.setModal(true);
            mListPopupWindow.setOnItemClickListener(mCallbacks);
            mListPopupWindow.setOnDismissListener(mCallbacks);
        }
        return mListPopupWindow;
    }

    /**
     * Updates the buttons state.
     */
    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 == 1 || (activityCount > 1 && historySize > 0)) {
            mDefaultActivityButton.setVisibility(VISIBLE);
            ResolveInfo activity = mAdapter.getDefaultActivity();
            PackageManager packageManager = getContext().getPackageManager();
            mDefaultActivityButtonImage.setImageDrawable(activity.loadIcon(packageManager));
            if (mDefaultActionButtonContentDescription != 0) {
                CharSequence label = activity.loadLabel(packageManager);
                String contentDescription = getContext().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 {

        Callbacks() {
        }

        // AdapterView#OnItemClickListener
        @Override
        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) {
                            launchIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
                            getContext().startActivity(launchIntent);
                        }
                    }
                } break;
                default:
                    throw new IllegalArgumentException();
            }
        }

        // View.OnClickListener
        @Override
        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) {
                    launchIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
                    getContext().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
        @Override
        public void onDismiss() {
            notifyOnDismissListener();
            if (mProvider != null) {
                mProvider.subUiVisibilityChanged(false);
            }
        }

        private void notifyOnDismissListener() {
            if (mOnDismissListener != null) {
                mOnDismissListener.onDismiss();
            }
        }
    }

    /**
     * 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;

        ActivityChooserViewAdapter() {
        }

        public void setDataModel(ActivityChooserModel dataModel) {
            ActivityChooserModel oldDataModel = mAdapter.getDataModel();
            if (oldDataModel != null && isShown()) {
                oldDataModel.unregisterObserver(mModelDataSetObserver);
            }
            mDataModel = dataModel;
            if (dataModel != null && isShown()) {
                dataModel.registerObserver(mModelDataSetObserver);
            }
            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;
        }

        @Override
        public int getCount() {
            int activityCount = mDataModel.getActivityCount();
            if (!mShowDefaultActivity && mDataModel.getDefaultActivity() != null) {
                activityCount--;
            }
            int count = Math.min(activityCount, mMaxActivityCount);
            if (mShowFooterView) {
                count++;
            }
            return count;
        }

        @Override
        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();
            }
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        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.abc_activity_chooser_view_list_item, parent, false);
                        convertView.setId(ITEM_VIEW_TYPE_FOOTER);
                        TextView titleView = (TextView) convertView.findViewById(R.id.title);
                        titleView.setText(getContext().getString(
                                R.string.abc_activity_chooser_view_see_all));
                    }
                    return convertView;
                case ITEM_VIEW_TYPE_ACTIVITY:
                    if (convertView == null || convertView.getId() != R.id.list_item) {
                        convertView = LayoutInflater.from(getContext()).inflate(
                                R.layout.abc_activity_chooser_view_list_item, parent, false);
                    }
                    PackageManager packageManager = getContext().getPackageManager();
                    // Set the icon
                    ImageView iconView = (ImageView) convertView.findViewById(R.id.icon);
                    ResolveInfo activity = (ResolveInfo) getItem(position);
                    iconView.setImageDrawable(activity.loadIcon(packageManager));
                    // Set the title.
                    TextView titleView = (TextView) convertView.findViewById(R.id.title);
                    titleView.setText(activity.loadLabel(packageManager));
                    // Highlight the default.
                    if (mShowDefaultActivity && position == 0 && mHighlightDefaultActivity) {
                        convertView.setActivated(true);
                    } else {
                        convertView.setActivated(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 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;
        }
    }

    /**
     * Allows us to set the background using TintTypedArray
     */
    @RestrictTo(LIBRARY_GROUP_PREFIX)
    public static class InnerLayout extends LinearLayout {

        private static final int[] TINT_ATTRS = {
                android.R.attr.background
        };

        public InnerLayout(Context context, AttributeSet attrs) {
            super(context, attrs);
            TintTypedArray a = TintTypedArray.obtainStyledAttributes(context, attrs, TINT_ATTRS);
            setBackgroundDrawable(a.getDrawable(0));
            a.recycle();
        }
    }
}