chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuAdapter.java - chromium/src - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.chrome.browser.appmenu;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.TextView;

 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.omaha.UpdateMenuItemHelper;
 import org.chromium.chrome.browser.widget.TintedImageButton;
 import org.chromium.chrome.browser.widget.ViewHighlighter;
 import org.chromium.ui.base.LocalizationUtils;
 import org.chromium.ui.interpolators.BakedBezierInterpolator;

 import java.util.List;

 /**
  * ListAdapter to customize the view of items in the list.
  *
  * The icon row in the menu is a special case of a MenuItem that displays multiple buttons in a row.
  * If, for some unfathomable reason, you need to add yet another icon to the row (the current max
  * is five), then you will need to:
  *
  * 1) Update icon_row_menu_item.xml to have as many buttons as you need.
  * 2) Edit the {@link BUTTON_IDS} to reference your new button.
  * 3) Hope that the icon row still fits on small phones.
  */
 class AppMenuAdapter extends BaseAdapter {
     /**
      * Regular Android menu item that contains a title and an icon if icon is specified.
      */
     private static final int STANDARD_MENU_ITEM = 0;

     /**
      * Menu item that has two buttons, the first one is a title and the second one is an icon.
      * It is different from the regular menu item because it contains two separate buttons.
      */
     private static final int TITLE_BUTTON_MENU_ITEM = 1;

     /**
      * Menu item that has three buttons. Every one of these buttons is displayed as an icon.
      */
     private static final int THREE_BUTTON_MENU_ITEM = 2;

     /**
      * Menu item that has four buttons. Every one of these buttons is displayed as an icon.
      */
     private static final int FOUR_BUTTON_MENU_ITEM = 3;

     /**
      * Menu item that has five buttons. Every one of these buttons is displayed as an icon.
      */
     private static final int FIVE_BUTTON_MENU_ITEM = 4;

     /**
      * Menu item for updating Chrome; uses a custom layout.
      */
     private static final int UPDATE_MENU_ITEM = 5;

     /**
      * The number of view types specified above.  If you add a view type you MUST increment this.
      */
     private static final int VIEW_TYPE_COUNT = 6;

     /** IDs of all of the buttons in icon_row_menu_item.xml. */
     private static final int[] BUTTON_IDS = {
         R.id.button_one,
         R.id.button_two,
         R.id.button_three,
         R.id.button_four,
         R.id.button_five
     };

     /** MenuItem Animation Constants */
     private static final int ENTER_ITEM_DURATION_MS = 350;
     private static final int ENTER_ITEM_BASE_DELAY_MS = 80;
     private static final int ENTER_ITEM_ADDL_DELAY_MS = 30;
     private static final float ENTER_STANDARD_ITEM_OFFSET_Y_DP = -10.f;
     private static final float ENTER_STANDARD_ITEM_OFFSET_X_DP = 10.f;

     private final AppMenu mAppMenu;
     private final LayoutInflater mInflater;
     private final List<MenuItem> mMenuItems;
     private final int mNumMenuItems;
     private final Integer mHighlightedItemId;
     private final float mDpToPx;
     private final boolean mTranslateMenuItemsOnShow;

     public AppMenuAdapter(AppMenu appMenu, List<MenuItem> menuItems, LayoutInflater inflater,
             Integer highlightedItemId, boolean translateMenuItemsOnShow) {
         mAppMenu = appMenu;
         mMenuItems = menuItems;
         mInflater = inflater;
         mHighlightedItemId = highlightedItemId;
         mNumMenuItems = menuItems.size();
         mTranslateMenuItemsOnShow = translateMenuItemsOnShow;
         mDpToPx = inflater.getContext().getResources().getDisplayMetrics().density;
     }

     @Override
     public int getCount() {
         return mNumMenuItems;
     }

     @Override
     public int getViewTypeCount() {
         return VIEW_TYPE_COUNT;
     }

     @Override
     public int getItemViewType(int position) {
         MenuItem item = getItem(position);
         int viewCount = item.hasSubMenu() ? item.getSubMenu().size() : 1;

         if (item.getItemId() == R.id.update_menu_id) {
             return UPDATE_MENU_ITEM;
         } else if (viewCount == 5) {
             return FIVE_BUTTON_MENU_ITEM;
         } else if (viewCount == 4) {
             return FOUR_BUTTON_MENU_ITEM;
         } else if (viewCount == 3) {
             return THREE_BUTTON_MENU_ITEM;
         } else if (viewCount == 2) {
             return TITLE_BUTTON_MENU_ITEM;
         }
         return STANDARD_MENU_ITEM;
     }

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

     @Override
     public MenuItem getItem(int position) {
         if (position == ListView.INVALID_POSITION) return null;
         assert position >= 0;
         assert position < mMenuItems.size();
         return mMenuItems.get(position);
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         final MenuItem item = getItem(position);
         switch (getItemViewType(position)) {
             case STANDARD_MENU_ITEM: {
                 StandardMenuItemViewHolder holder = null;
                 if (convertView == null
                         || !(convertView.getTag() instanceof StandardMenuItemViewHolder)) {
                     holder = new StandardMenuItemViewHolder();
                     convertView = mInflater.inflate(R.layout.menu_item, parent, false);
                     holder.text = (TextView) convertView.findViewById(R.id.menu_item_text);
                     holder.image = (AppMenuItemIcon) convertView.findViewById(R.id.menu_item_icon);
                     convertView.setTag(holder);
                     convertView.setTag(R.id.menu_item_enter_anim_id,
                             buildStandardItemEnterAnimator(convertView, position));
                     convertView.setTag(
                             R.id.menu_item_original_background, convertView.getBackground());
                 } else {
                     holder = (StandardMenuItemViewHolder) convertView.getTag();
                 }

                 setupStandardMenuItemViewHolder(holder, convertView, item);
                 break;
             }
             case UPDATE_MENU_ITEM: {
                 CustomMenuItemViewHolder holder = null;
                 if (convertView == null
                         || !(convertView.getTag() instanceof CustomMenuItemViewHolder)) {
                     holder = new CustomMenuItemViewHolder();
                     convertView = mInflater.inflate(R.layout.update_menu_item, parent, false);
                     holder.text = (TextView) convertView.findViewById(R.id.menu_item_text);
                     holder.image = (AppMenuItemIcon) convertView.findViewById(R.id.menu_item_icon);
                     holder.summary = (TextView) convertView.findViewById(R.id.menu_item_summary);
                     convertView.setTag(holder);
                     convertView.setTag(R.id.menu_item_enter_anim_id,
                             buildStandardItemEnterAnimator(convertView, position));
                     convertView.setTag(
                             R.id.menu_item_original_background, convertView.getBackground());
                 } else {
                     holder = (CustomMenuItemViewHolder) convertView.getTag();
                 }

                 setupStandardMenuItemViewHolder(holder, convertView, item);
                 String summary = UpdateMenuItemHelper.getInstance().getMenuItemSummaryText(
                         mInflater.getContext());
                 if (TextUtils.isEmpty(summary)) {
                     holder.summary.setVisibility(View.GONE);
                 } else {
                     holder.summary.setText(summary);
                 }

                 break;
             }
             case THREE_BUTTON_MENU_ITEM: {
                 convertView = createMenuItemRow(convertView, parent, item, 3);
                 break;
             }
             case FOUR_BUTTON_MENU_ITEM: {
                 convertView = createMenuItemRow(convertView, parent, item, 4);
                 break;
             }
             case FIVE_BUTTON_MENU_ITEM: {
                 convertView = createMenuItemRow(convertView, parent, item, 5);
                 break;
             }
             case TITLE_BUTTON_MENU_ITEM: {
                 assert item.hasSubMenu();
                 final MenuItem titleItem = item.getSubMenu().getItem(0);
                 final MenuItem subItem = item.getSubMenu().getItem(1);

                 TitleButtonMenuItemViewHolder holder = null;
                 if (convertView == null
                         || !(convertView.getTag() instanceof TitleButtonMenuItemViewHolder)) {
                     convertView = mInflater.inflate(R.layout.title_button_menu_item, parent, false);

                     holder = new TitleButtonMenuItemViewHolder();
                     holder.title = (TextView) convertView.findViewById(R.id.title);
                     holder.checkbox = (AppMenuItemIcon) convertView.findViewById(R.id.checkbox);
                     holder.button = (TintedImageButton) convertView.findViewById(R.id.button);
                     holder.button.setTag(
                             R.id.menu_item_original_background, holder.button.getBackground());

                     convertView.setTag(holder);
                     convertView.setTag(R.id.menu_item_enter_anim_id,
                             buildStandardItemEnterAnimator(convertView, position));
                     convertView.setTag(
                             R.id.menu_item_original_background, convertView.getBackground());
                 } else {
                     holder = (TitleButtonMenuItemViewHolder) convertView.getTag();
                 }

                 holder.title.setText(titleItem.getTitle());
                 holder.title.setEnabled(titleItem.isEnabled());
                 holder.title.setFocusable(titleItem.isEnabled());
                 holder.title.setOnClickListener(v -> mAppMenu.onItemClick(titleItem));

                 if (subItem.isCheckable()) {
                     // Display a checkbox for the MenuItem.
                     holder.checkbox.setVisibility(View.VISIBLE);
                     holder.button.setVisibility(View.GONE);
                     setupCheckBox(holder.checkbox, subItem);
                 } else if (subItem.getIcon() != null) {
                     // Display an icon alongside the MenuItem.
                     holder.checkbox.setVisibility(View.GONE);
                     holder.button.setVisibility(View.VISIBLE);
                     setupImageButton(holder.button, subItem);
                 } else {
                     // Display just the label of the MenuItem.
                     holder.checkbox.setVisibility(View.GONE);
                     holder.button.setVisibility(View.GONE);
                 }

                 convertView.setFocusable(false);
                 convertView.setEnabled(false);
                 break;
             }
             default:
                 assert false : "Unexpected MenuItem type";
         }

         if (mHighlightedItemId != null && item.getItemId() == mHighlightedItemId) {
             ViewHighlighter.turnOnHighlight(convertView, false);
         } else {
             ViewHighlighter.turnOffHighlight(convertView);
         }

         return convertView;
     }

     private void setupCheckBox(AppMenuItemIcon button, final MenuItem item) {
         button.setChecked(item.isChecked());

         // The checkbox must be tinted to make Android consistently style it across OS versions.
         // http://crbug.com/571445
         button.setTint(ApiCompatibilityUtils.getColorStateList(
                 button.getResources(), R.color.checkbox_tint));

         setupMenuButton(button, item);
     }

     private void setupImageButton(TintedImageButton button, final MenuItem item) {
         // Store and recover the level of image as button.setimageDrawable
         // resets drawable to default level.
         int currentLevel = item.getIcon().getLevel();
         button.setImageDrawable(item.getIcon());
         item.getIcon().setLevel(currentLevel);

         if (item.isChecked()) {
             button.setTint(ApiCompatibilityUtils.getColorStateList(
                     button.getResources(), R.color.blue_mode_tint));
         }

         setupMenuButton(button, item);
     }

     private void setupMenuButton(View button, final MenuItem item) {
         button.setEnabled(item.isEnabled());
         button.setFocusable(item.isEnabled());
         if (TextUtils.isEmpty(item.getTitleCondensed())) {
             button.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
         } else {
             button.setContentDescription(item.getTitleCondensed());
             button.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_AUTO);
         }

         button.setOnClickListener(v -> mAppMenu.onItemClick(item));

         button.setOnLongClickListener(v -> mAppMenu.onItemLongClick(item, v));

         if (mHighlightedItemId != null && item.getItemId() == mHighlightedItemId) {
             ViewHighlighter.turnOnHighlight(button, true);
         } else {
             ViewHighlighter.turnOffHighlight(button);
         }

         // Menu items may be hidden by command line flags before they get to this point.
         button.setVisibility(item.isVisible() ? View.VISIBLE : View.GONE);
     }

     private void setupStandardMenuItemViewHolder(StandardMenuItemViewHolder holder,
             View convertView, final MenuItem item) {
         // Set up the icon.
         Drawable icon = item.getIcon();
         holder.image.setImageDrawable(icon);
         holder.image.setVisibility(icon == null ? View.GONE : View.VISIBLE);
         holder.image.setChecked(item.isChecked());
         holder.text.setText(item.getTitle());
         holder.text.setContentDescription(item.getTitleCondensed());

         boolean isEnabled = item.isEnabled();
         // Set the text color (using a color state list).
         holder.text.setEnabled(isEnabled);
         // This will ensure that the item is not highlighted when selected.
         convertView.setEnabled(isEnabled);

         convertView.setOnClickListener(v -> mAppMenu.onItemClick(item));
     }

     /**
      * This builds an {@link Animator} for the enter animation of a standard menu item.  This means
      * it will animate the alpha from 0 to 1 and translate the view from -10dp to 0dp on the y axis.
      *
      * @param view     The menu item {@link View} to be animated.
      * @param position The position in the menu.  This impacts the start delay of the animation.
      * @return         The {@link Animator}.
      */
     private Animator buildStandardItemEnterAnimator(final View view, int position) {
         final int startDelay = ENTER_ITEM_BASE_DELAY_MS + ENTER_ITEM_ADDL_DELAY_MS * position;

         AnimatorSet animation = new AnimatorSet();
         if (mTranslateMenuItemsOnShow) {
             final float offsetYPx = ENTER_STANDARD_ITEM_OFFSET_Y_DP * mDpToPx;
             animation.playTogether(ObjectAnimator.ofFloat(view, View.ALPHA, 0.f, 1.f),
                     ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, offsetYPx, 0.f));
             animation.setStartDelay(startDelay);
         } else {
             animation.playTogether(ObjectAnimator.ofFloat(view, View.ALPHA, 0.f, 1.f));
             // Start delay is set to make sure disabling the animation in battery saver mode does
             // not cause the view to stay at alpha 0 on Android O.
             animation.setStartDelay(ENTER_ITEM_BASE_DELAY_MS);
         }
         animation.setDuration(ENTER_ITEM_DURATION_MS);
         animation.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);

         animation.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationStart(Animator animation) {
                 view.setAlpha(0.f);
             }
         });
         return animation;
     }

     /**
      * This builds an {@link Animator} for the enter animation of icon row menu items.  This means
      * it will animate the alpha from 0 to 1 and translate the views from 10dp to 0dp on the x axis.
      *
      * @param buttons The list of icons in the menu item that should be animated.
      * @return        The {@link Animator}.
      */
     private Animator buildIconItemEnterAnimator(final ImageView[] buttons) {
         final boolean rtl = LocalizationUtils.isLayoutRtl();
         final float offsetXPx = ENTER_STANDARD_ITEM_OFFSET_X_DP * mDpToPx * (rtl ? -1.f : 1.f);
         final int maxViewsToAnimate = buttons.length;

         AnimatorSet animation = new AnimatorSet();
         AnimatorSet.Builder builder = null;
         for (int i = 0; i < maxViewsToAnimate; i++) {
             final int startDelay = ENTER_ITEM_ADDL_DELAY_MS * i;

             ImageView view = buttons[i];
             Animator alpha = ObjectAnimator.ofFloat(view, View.ALPHA, 0.f, 1.f);
             Animator translate = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, offsetXPx, 0);
             alpha.setStartDelay(startDelay);
             translate.setStartDelay(startDelay);
             alpha.setDuration(ENTER_ITEM_DURATION_MS);
             translate.setDuration(ENTER_ITEM_DURATION_MS);

             if (builder == null) {
                 builder = animation.play(alpha);
             } else {
                 builder.with(alpha);
             }
             builder.with(translate);
         }
         animation.setStartDelay(ENTER_ITEM_BASE_DELAY_MS);
         animation.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);

         animation.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationStart(Animator animation) {
                 for (int i = 0; i < maxViewsToAnimate; i++) {
                     buttons[i].setAlpha(0.f);
                 }
             }
         });
         return animation;
     }

     private View createMenuItemRow(
             View convertView, ViewGroup parent, MenuItem item, int numItems) {
         RowItemViewHolder holder = null;
         if (convertView == null
                 || !(convertView.getTag() instanceof RowItemViewHolder)
                 || ((RowItemViewHolder) convertView.getTag()).buttons.length != numItems) {
             holder = new RowItemViewHolder(numItems);
             convertView = mInflater.inflate(R.layout.icon_row_menu_item, parent, false);
             convertView.setTag(R.id.menu_item_original_background, convertView.getBackground());

             // Save references to all the buttons.
             for (int i = 0; i < numItems; i++) {
                 TintedImageButton view =
                         (TintedImageButton) convertView.findViewById(BUTTON_IDS[i]);
                 holder.buttons[i] = view;
                 holder.buttons[i].setTag(
                         R.id.menu_item_original_background, holder.buttons[i].getBackground());
             }

             // Remove unused menu items.
             for (int j = numItems; j < 5; j++) {
                 ((ViewGroup) convertView).removeView(convertView.findViewById(BUTTON_IDS[j]));
             }

             convertView.setTag(holder);
             convertView.setTag(R.id.menu_item_enter_anim_id,
                     buildIconItemEnterAnimator(holder.buttons));
         } else {
             holder = (RowItemViewHolder) convertView.getTag();
         }

         for (int i = 0; i < numItems; i++) {
             setupImageButton(holder.buttons[i], item.getSubMenu().getItem(i));
         }
         convertView.setFocusable(false);
         convertView.setEnabled(false);
         return convertView;
     }

     static class StandardMenuItemViewHolder {
         public TextView text;
         public AppMenuItemIcon image;
     }

     static class CustomMenuItemViewHolder extends StandardMenuItemViewHolder {
         public TextView summary;
     }

     private static class RowItemViewHolder {
         public TintedImageButton[] buttons;

         RowItemViewHolder(int numButtons) {
             buttons = new TintedImageButton[numButtons];
         }
     }

     static class TitleButtonMenuItemViewHolder {
         public TextView title;
         public AppMenuItemIcon checkbox;
         public TintedImageButton button;
     }
 }
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.chrome.browser.appmenu;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.animation.ObjectAnimator;
	import android.graphics.drawable.Drawable;
	import android.text.TextUtils;
	import android.view.LayoutInflater;
	import android.view.MenuItem;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.BaseAdapter;
	import android.widget.ImageView;
	import android.widget.ListView;
	import android.widget.TextView;

	import org.chromium.base.ApiCompatibilityUtils;
	import org.chromium.chrome.R;
	import org.chromium.chrome.browser.omaha.UpdateMenuItemHelper;
	import org.chromium.chrome.browser.widget.TintedImageButton;
	import org.chromium.chrome.browser.widget.ViewHighlighter;
	import org.chromium.ui.base.LocalizationUtils;
	import org.chromium.ui.interpolators.BakedBezierInterpolator;

	import java.util.List;

	/**
	* ListAdapter to customize the view of items in the list.
	*
	* The icon row in the menu is a special case of a MenuItem that displays multiple buttons in a row.
	* If, for some unfathomable reason, you need to add yet another icon to the row (the current max
	* is five), then you will need to:
	*
	* 1) Update icon_row_menu_item.xml to have as many buttons as you need.
	* 2) Edit the {@link BUTTON_IDS} to reference your new button.
	* 3) Hope that the icon row still fits on small phones.
	*/
	class AppMenuAdapter extends BaseAdapter {
	/**
	* Regular Android menu item that contains a title and an icon if icon is specified.
	*/
	private static final int STANDARD_MENU_ITEM = 0;

	/**
	* Menu item that has two buttons, the first one is a title and the second one is an icon.
	* It is different from the regular menu item because it contains two separate buttons.
	*/
	private static final int TITLE_BUTTON_MENU_ITEM = 1;

	/**
	* Menu item that has three buttons. Every one of these buttons is displayed as an icon.
	*/
	private static final int THREE_BUTTON_MENU_ITEM = 2;

	/**
	* Menu item that has four buttons. Every one of these buttons is displayed as an icon.
	*/
	private static final int FOUR_BUTTON_MENU_ITEM = 3;

	/**
	* Menu item that has five buttons. Every one of these buttons is displayed as an icon.
	*/
	private static final int FIVE_BUTTON_MENU_ITEM = 4;

	/**
	* Menu item for updating Chrome; uses a custom layout.
	*/
	private static final int UPDATE_MENU_ITEM = 5;

	/**
	* The number of view types specified above. If you add a view type you MUST increment this.
	*/
	private static final int VIEW_TYPE_COUNT = 6;

	/** IDs of all of the buttons in icon_row_menu_item.xml. */
	private static final int[] BUTTON_IDS = {
	R.id.button_one,
	R.id.button_two,
	R.id.button_three,
	R.id.button_four,
	R.id.button_five
	};

	/** MenuItem Animation Constants */
	private static final int ENTER_ITEM_DURATION_MS = 350;
	private static final int ENTER_ITEM_BASE_DELAY_MS = 80;
	private static final int ENTER_ITEM_ADDL_DELAY_MS = 30;
	private static final float ENTER_STANDARD_ITEM_OFFSET_Y_DP = -10.f;
	private static final float ENTER_STANDARD_ITEM_OFFSET_X_DP = 10.f;

	private final AppMenu mAppMenu;
	private final LayoutInflater mInflater;
	private final List<MenuItem> mMenuItems;
	private final int mNumMenuItems;
	private final Integer mHighlightedItemId;
	private final float mDpToPx;
	private final boolean mTranslateMenuItemsOnShow;

	public AppMenuAdapter(AppMenu appMenu, List<MenuItem> menuItems, LayoutInflater inflater,
	Integer highlightedItemId, boolean translateMenuItemsOnShow) {
	mAppMenu = appMenu;
	mMenuItems = menuItems;
	mInflater = inflater;
	mHighlightedItemId = highlightedItemId;
	mNumMenuItems = menuItems.size();
	mTranslateMenuItemsOnShow = translateMenuItemsOnShow;
	mDpToPx = inflater.getContext().getResources().getDisplayMetrics().density;
	}

	@Override
	public int getCount() {
	return mNumMenuItems;
	}

	@Override
	public int getViewTypeCount() {
	return VIEW_TYPE_COUNT;
	}

	@Override
	public int getItemViewType(int position) {
	MenuItem item = getItem(position);
	int viewCount = item.hasSubMenu() ? item.getSubMenu().size() : 1;

	if (item.getItemId() == R.id.update_menu_id) {
	return UPDATE_MENU_ITEM;
	} else if (viewCount == 5) {
	return FIVE_BUTTON_MENU_ITEM;
	} else if (viewCount == 4) {
	return FOUR_BUTTON_MENU_ITEM;
	} else if (viewCount == 3) {
	return THREE_BUTTON_MENU_ITEM;
	} else if (viewCount == 2) {
	return TITLE_BUTTON_MENU_ITEM;
	}
	return STANDARD_MENU_ITEM;
	}

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

	@Override
	public MenuItem getItem(int position) {
	if (position == ListView.INVALID_POSITION) return null;
	assert position >= 0;
	assert position < mMenuItems.size();
	return mMenuItems.get(position);
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	final MenuItem item = getItem(position);
	switch (getItemViewType(position)) {
	case STANDARD_MENU_ITEM: {
	StandardMenuItemViewHolder holder = null;
	if (convertView == null
	\|\| !(convertView.getTag() instanceof StandardMenuItemViewHolder)) {
	holder = new StandardMenuItemViewHolder();
	convertView = mInflater.inflate(R.layout.menu_item, parent, false);
	holder.text = (TextView) convertView.findViewById(R.id.menu_item_text);
	holder.image = (AppMenuItemIcon) convertView.findViewById(R.id.menu_item_icon);
	convertView.setTag(holder);
	convertView.setTag(R.id.menu_item_enter_anim_id,
	buildStandardItemEnterAnimator(convertView, position));
	convertView.setTag(
	R.id.menu_item_original_background, convertView.getBackground());
	} else {
	holder = (StandardMenuItemViewHolder) convertView.getTag();
	}

	setupStandardMenuItemViewHolder(holder, convertView, item);
	break;
	}
	case UPDATE_MENU_ITEM: {
	CustomMenuItemViewHolder holder = null;
	if (convertView == null
	\|\| !(convertView.getTag() instanceof CustomMenuItemViewHolder)) {
	holder = new CustomMenuItemViewHolder();
	convertView = mInflater.inflate(R.layout.update_menu_item, parent, false);
	holder.text = (TextView) convertView.findViewById(R.id.menu_item_text);
	holder.image = (AppMenuItemIcon) convertView.findViewById(R.id.menu_item_icon);
	holder.summary = (TextView) convertView.findViewById(R.id.menu_item_summary);
	convertView.setTag(holder);
	convertView.setTag(R.id.menu_item_enter_anim_id,
	buildStandardItemEnterAnimator(convertView, position));
	convertView.setTag(
	R.id.menu_item_original_background, convertView.getBackground());
	} else {
	holder = (CustomMenuItemViewHolder) convertView.getTag();
	}

	setupStandardMenuItemViewHolder(holder, convertView, item);
	String summary = UpdateMenuItemHelper.getInstance().getMenuItemSummaryText(
	mInflater.getContext());
	if (TextUtils.isEmpty(summary)) {
	holder.summary.setVisibility(View.GONE);
	} else {
	holder.summary.setText(summary);
	}

	break;
	}
	case THREE_BUTTON_MENU_ITEM: {
	convertView = createMenuItemRow(convertView, parent, item, 3);
	break;
	}
	case FOUR_BUTTON_MENU_ITEM: {
	convertView = createMenuItemRow(convertView, parent, item, 4);
	break;
	}
	case FIVE_BUTTON_MENU_ITEM: {
	convertView = createMenuItemRow(convertView, parent, item, 5);
	break;
	}
	case TITLE_BUTTON_MENU_ITEM: {
	assert item.hasSubMenu();
	final MenuItem titleItem = item.getSubMenu().getItem(0);
	final MenuItem subItem = item.getSubMenu().getItem(1);

	TitleButtonMenuItemViewHolder holder = null;
	if (convertView == null
	\|\| !(convertView.getTag() instanceof TitleButtonMenuItemViewHolder)) {
	convertView = mInflater.inflate(R.layout.title_button_menu_item, parent, false);

	holder = new TitleButtonMenuItemViewHolder();
	holder.title = (TextView) convertView.findViewById(R.id.title);
	holder.checkbox = (AppMenuItemIcon) convertView.findViewById(R.id.checkbox);
	holder.button = (TintedImageButton) convertView.findViewById(R.id.button);
	holder.button.setTag(
	R.id.menu_item_original_background, holder.button.getBackground());

	convertView.setTag(holder);
	convertView.setTag(R.id.menu_item_enter_anim_id,
	buildStandardItemEnterAnimator(convertView, position));
	convertView.setTag(
	R.id.menu_item_original_background, convertView.getBackground());
	} else {
	holder = (TitleButtonMenuItemViewHolder) convertView.getTag();
	}

	holder.title.setText(titleItem.getTitle());
	holder.title.setEnabled(titleItem.isEnabled());
	holder.title.setFocusable(titleItem.isEnabled());
	holder.title.setOnClickListener(v -> mAppMenu.onItemClick(titleItem));

	if (subItem.isCheckable()) {
	// Display a checkbox for the MenuItem.
	holder.checkbox.setVisibility(View.VISIBLE);
	holder.button.setVisibility(View.GONE);
	setupCheckBox(holder.checkbox, subItem);
	} else if (subItem.getIcon() != null) {
	// Display an icon alongside the MenuItem.
	holder.checkbox.setVisibility(View.GONE);
	holder.button.setVisibility(View.VISIBLE);
	setupImageButton(holder.button, subItem);
	} else {
	// Display just the label of the MenuItem.
	holder.checkbox.setVisibility(View.GONE);
	holder.button.setVisibility(View.GONE);
	}

	convertView.setFocusable(false);
	convertView.setEnabled(false);
	break;
	}
	default:
	assert false : "Unexpected MenuItem type";
	}

	if (mHighlightedItemId != null && item.getItemId() == mHighlightedItemId) {
	ViewHighlighter.turnOnHighlight(convertView, false);
	} else {
	ViewHighlighter.turnOffHighlight(convertView);
	}

	return convertView;
	}

	private void setupCheckBox(AppMenuItemIcon button, final MenuItem item) {
	button.setChecked(item.isChecked());

	// The checkbox must be tinted to make Android consistently style it across OS versions.
	// http://crbug.com/571445
	button.setTint(ApiCompatibilityUtils.getColorStateList(
	button.getResources(), R.color.checkbox_tint));

	setupMenuButton(button, item);
	}

	private void setupImageButton(TintedImageButton button, final MenuItem item) {
	// Store and recover the level of image as button.setimageDrawable
	// resets drawable to default level.
	int currentLevel = item.getIcon().getLevel();
	button.setImageDrawable(item.getIcon());
	item.getIcon().setLevel(currentLevel);

	if (item.isChecked()) {
	button.setTint(ApiCompatibilityUtils.getColorStateList(
	button.getResources(), R.color.blue_mode_tint));
	}

	setupMenuButton(button, item);
	}

	private void setupMenuButton(View button, final MenuItem item) {
	button.setEnabled(item.isEnabled());
	button.setFocusable(item.isEnabled());
	if (TextUtils.isEmpty(item.getTitleCondensed())) {
	button.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
	} else {
	button.setContentDescription(item.getTitleCondensed());
	button.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_AUTO);
	}

	button.setOnClickListener(v -> mAppMenu.onItemClick(item));

	button.setOnLongClickListener(v -> mAppMenu.onItemLongClick(item, v));

	if (mHighlightedItemId != null && item.getItemId() == mHighlightedItemId) {
	ViewHighlighter.turnOnHighlight(button, true);
	} else {
	ViewHighlighter.turnOffHighlight(button);
	}

	// Menu items may be hidden by command line flags before they get to this point.
	button.setVisibility(item.isVisible() ? View.VISIBLE : View.GONE);
	}

	private void setupStandardMenuItemViewHolder(StandardMenuItemViewHolder holder,
	View convertView, final MenuItem item) {
	// Set up the icon.
	Drawable icon = item.getIcon();
	holder.image.setImageDrawable(icon);
	holder.image.setVisibility(icon == null ? View.GONE : View.VISIBLE);
	holder.image.setChecked(item.isChecked());
	holder.text.setText(item.getTitle());
	holder.text.setContentDescription(item.getTitleCondensed());

	boolean isEnabled = item.isEnabled();
	// Set the text color (using a color state list).
	holder.text.setEnabled(isEnabled);
	// This will ensure that the item is not highlighted when selected.
	convertView.setEnabled(isEnabled);

	convertView.setOnClickListener(v -> mAppMenu.onItemClick(item));
	}

	/**
	* This builds an {@link Animator} for the enter animation of a standard menu item. This means
	* it will animate the alpha from 0 to 1 and translate the view from -10dp to 0dp on the y axis.
	*
	* @param view The menu item {@link View} to be animated.
	* @param position The position in the menu. This impacts the start delay of the animation.
	* @return The {@link Animator}.
	*/
	private Animator buildStandardItemEnterAnimator(final View view, int position) {
	final int startDelay = ENTER_ITEM_BASE_DELAY_MS + ENTER_ITEM_ADDL_DELAY_MS * position;

	AnimatorSet animation = new AnimatorSet();
	if (mTranslateMenuItemsOnShow) {
	final float offsetYPx = ENTER_STANDARD_ITEM_OFFSET_Y_DP * mDpToPx;
	animation.playTogether(ObjectAnimator.ofFloat(view, View.ALPHA, 0.f, 1.f),
	ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, offsetYPx, 0.f));
	animation.setStartDelay(startDelay);
	} else {
	animation.playTogether(ObjectAnimator.ofFloat(view, View.ALPHA, 0.f, 1.f));
	// Start delay is set to make sure disabling the animation in battery saver mode does
	// not cause the view to stay at alpha 0 on Android O.
	animation.setStartDelay(ENTER_ITEM_BASE_DELAY_MS);
	}
	animation.setDuration(ENTER_ITEM_DURATION_MS);
	animation.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);

	animation.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationStart(Animator animation) {
	view.setAlpha(0.f);
	}
	});
	return animation;
	}

	/**
	* This builds an {@link Animator} for the enter animation of icon row menu items. This means
	* it will animate the alpha from 0 to 1 and translate the views from 10dp to 0dp on the x axis.
	*
	* @param buttons The list of icons in the menu item that should be animated.
	* @return The {@link Animator}.
	*/
	private Animator buildIconItemEnterAnimator(final ImageView[] buttons) {
	final boolean rtl = LocalizationUtils.isLayoutRtl();
	final float offsetXPx = ENTER_STANDARD_ITEM_OFFSET_X_DP * mDpToPx * (rtl ? -1.f : 1.f);
	final int maxViewsToAnimate = buttons.length;

	AnimatorSet animation = new AnimatorSet();
	AnimatorSet.Builder builder = null;
	for (int i = 0; i < maxViewsToAnimate; i++) {
	final int startDelay = ENTER_ITEM_ADDL_DELAY_MS * i;

	ImageView view = buttons[i];
	Animator alpha = ObjectAnimator.ofFloat(view, View.ALPHA, 0.f, 1.f);
	Animator translate = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, offsetXPx, 0);
	alpha.setStartDelay(startDelay);
	translate.setStartDelay(startDelay);
	alpha.setDuration(ENTER_ITEM_DURATION_MS);
	translate.setDuration(ENTER_ITEM_DURATION_MS);

	if (builder == null) {
	builder = animation.play(alpha);
	} else {
	builder.with(alpha);
	}
	builder.with(translate);
	}
	animation.setStartDelay(ENTER_ITEM_BASE_DELAY_MS);
	animation.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);

	animation.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationStart(Animator animation) {
	for (int i = 0; i < maxViewsToAnimate; i++) {
	buttons[i].setAlpha(0.f);
	}
	}
	});
	return animation;
	}

	private View createMenuItemRow(
	View convertView, ViewGroup parent, MenuItem item, int numItems) {
	RowItemViewHolder holder = null;
	if (convertView == null
	\|\| !(convertView.getTag() instanceof RowItemViewHolder)
	\|\| ((RowItemViewHolder) convertView.getTag()).buttons.length != numItems) {
	holder = new RowItemViewHolder(numItems);
	convertView = mInflater.inflate(R.layout.icon_row_menu_item, parent, false);
	convertView.setTag(R.id.menu_item_original_background, convertView.getBackground());

	// Save references to all the buttons.
	for (int i = 0; i < numItems; i++) {
	TintedImageButton view =
	(TintedImageButton) convertView.findViewById(BUTTON_IDS[i]);
	holder.buttons[i] = view;
	holder.buttons[i].setTag(
	R.id.menu_item_original_background, holder.buttons[i].getBackground());
	}

	// Remove unused menu items.
	for (int j = numItems; j < 5; j++) {
	((ViewGroup) convertView).removeView(convertView.findViewById(BUTTON_IDS[j]));
	}

	convertView.setTag(holder);
	convertView.setTag(R.id.menu_item_enter_anim_id,
	buildIconItemEnterAnimator(holder.buttons));
	} else {
	holder = (RowItemViewHolder) convertView.getTag();
	}

	for (int i = 0; i < numItems; i++) {
	setupImageButton(holder.buttons[i], item.getSubMenu().getItem(i));
	}
	convertView.setFocusable(false);
	convertView.setEnabled(false);
	return convertView;
	}

	static class StandardMenuItemViewHolder {
	public TextView text;
	public AppMenuItemIcon image;
	}

	static class CustomMenuItemViewHolder extends StandardMenuItemViewHolder {
	public TextView summary;
	}

	private static class RowItemViewHolder {
	public TintedImageButton[] buttons;

	RowItemViewHolder(int numButtons) {
	buttons = new TintedImageButton[numButtons];
	}
	}

	static class TitleButtonMenuItemViewHolder {
	public TextView title;
	public AppMenuItemIcon checkbox;
	public TintedImageButton button;
	}
	}