src/com/android/launcher3/allapps/AllAppsGridAdapter.java - platform/packages/apps/Launcher3 - Git at Google

 /*
  * Copyright (C) 2015 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.android.launcher3.allapps;

 import static com.android.launcher3.touch.ItemLongClickListener.INSTANCE_ALL_APPS;

 import android.content.Context;
 import android.content.Intent;
 import android.content.res.Resources;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.View.OnFocusChangeListener;
 import android.view.View.OnLongClickListener;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.TextView;

 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.view.accessibility.AccessibilityEventCompat;
 import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
 import androidx.core.view.accessibility.AccessibilityRecordCompat;
 import androidx.recyclerview.widget.GridLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;

 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.BubbleTextView;
 import com.android.launcher3.R;
 import com.android.launcher3.model.data.AppInfo;
 import com.android.launcher3.util.PackageManagerHelper;

 import java.util.Arrays;
 import java.util.List;

 /**
  * The grid view adapter of all the apps.
  */
 public class AllAppsGridAdapter extends
         RecyclerView.Adapter<AllAppsGridAdapter.ViewHolder> {

     public static final String TAG = "AppsGridAdapter";

     // A normal icon
     public static final int VIEW_TYPE_ICON = 1 << 1;
     // The message shown when there are no filtered results
     public static final int VIEW_TYPE_EMPTY_SEARCH = 1 << 2;
     // The message to continue to a market search when there are no filtered results
     public static final int VIEW_TYPE_SEARCH_MARKET = 1 << 3;

     // We use various dividers for various purposes.  They share enough attributes to reuse layouts,
     // but differ in enough attributes to require different view types

     // A divider that separates the apps list and the search market button
     public static final int VIEW_TYPE_ALL_APPS_DIVIDER = 1 << 4;

     // Common view type masks
     public static final int VIEW_TYPE_MASK_DIVIDER = VIEW_TYPE_ALL_APPS_DIVIDER;
     public static final int VIEW_TYPE_MASK_ICON = VIEW_TYPE_ICON;


     private final BaseAdapterProvider[] mAdapterProviders;

     /**
      * ViewHolder for each icon.
      */
     public static class ViewHolder extends RecyclerView.ViewHolder {

         public ViewHolder(View v) {
             super(v);
         }
     }

     /**
      * Info about a particular adapter item (can be either section or app)
      */
     public static class AdapterItem {
         /** Common properties */
         // The index of this adapter item in the list
         public int position;
         // The type of this item
         public int viewType;

         /** App-only properties */
         // The section name of this app.  Note that there can be multiple items with different
         // sectionNames in the same section
         public String sectionName = null;
         // The row that this item shows up on
         public int rowIndex;
         // The index of this app in the row
         public int rowAppIndex;
         // The associated AppInfo for the app
         public AppInfo appInfo = null;
         // The index of this app not including sections
         public int appIndex = -1;
         // Search section associated to result
         public DecorationInfo decorationInfo = null;

         /**
          * Factory method for AppIcon AdapterItem
          */
         public static AdapterItem asApp(int pos, String sectionName, AppInfo appInfo,
                 int appIndex) {
             AdapterItem item = new AdapterItem();
             item.viewType = VIEW_TYPE_ICON;
             item.position = pos;
             item.sectionName = sectionName;
             item.appInfo = appInfo;
             item.appIndex = appIndex;
             return item;
         }

         /**
          * Factory method for empty search results view
          */
         public static AdapterItem asEmptySearch(int pos) {
             AdapterItem item = new AdapterItem();
             item.viewType = VIEW_TYPE_EMPTY_SEARCH;
             item.position = pos;
             return item;
         }

         /**
          * Factory method for a dividerView in AllAppsSearch
          */
         public static AdapterItem asAllAppsDivider(int pos) {
             AdapterItem item = new AdapterItem();
             item.viewType = VIEW_TYPE_ALL_APPS_DIVIDER;
             item.position = pos;
             return item;
         }

         /**
          * Factory method for a market search button
          */
         public static AdapterItem asMarketSearch(int pos) {
             AdapterItem item = new AdapterItem();
             item.viewType = VIEW_TYPE_SEARCH_MARKET;
             item.position = pos;
             return item;
         }

         protected boolean isCountedForAccessibility() {
             return viewType == VIEW_TYPE_ICON || viewType == VIEW_TYPE_SEARCH_MARKET;
         }
     }

     /**
      * A subclass of GridLayoutManager that overrides accessibility values during app search.
      */
     public class AppsGridLayoutManager extends GridLayoutManager {

         public AppsGridLayoutManager(Context context) {
             super(context, 1, GridLayoutManager.VERTICAL, false);
         }

         @Override
         public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
             super.onInitializeAccessibilityEvent(event);

             // Ensure that we only report the number apps for accessibility not including other
             // adapter views
             final AccessibilityRecordCompat record = AccessibilityEventCompat
                     .asRecord(event);
             record.setItemCount(mApps.getNumFilteredApps());
             record.setFromIndex(Math.max(0,
                     record.getFromIndex() - getRowsNotForAccessibility(record.getFromIndex())));
             record.setToIndex(Math.max(0,
                     record.getToIndex() - getRowsNotForAccessibility(record.getToIndex())));
         }

         @Override
         public int getRowCountForAccessibility(RecyclerView.Recycler recycler,
                 RecyclerView.State state) {
             return super.getRowCountForAccessibility(recycler, state) -
                     getRowsNotForAccessibility(mApps.getAdapterItems().size() - 1);
         }

         @Override
         public void onInitializeAccessibilityNodeInfoForItem(RecyclerView.Recycler recycler,
                 RecyclerView.State state, View host, AccessibilityNodeInfoCompat info) {
             super.onInitializeAccessibilityNodeInfoForItem(recycler, state, host, info);

             ViewGroup.LayoutParams lp = host.getLayoutParams();
             AccessibilityNodeInfoCompat.CollectionItemInfoCompat cic = info.getCollectionItemInfo();
             if (!(lp instanceof LayoutParams) || (cic == null)) {
                 return;
             }
             LayoutParams glp = (LayoutParams) lp;
             info.setCollectionItemInfo(AccessibilityNodeInfoCompat.CollectionItemInfoCompat.obtain(
                     cic.getRowIndex() - getRowsNotForAccessibility(glp.getViewAdapterPosition()),
                     cic.getRowSpan(),
                     cic.getColumnIndex(),
                     cic.getColumnSpan(),
                     cic.isHeading(),
                     cic.isSelected()));
         }

         /**
          * Returns the number of rows before {@param adapterPosition}, including this position
          * which should not be counted towards the collection info.
          */
         private int getRowsNotForAccessibility(int adapterPosition) {
             List<AdapterItem> items = mApps.getAdapterItems();
             adapterPosition = Math.max(adapterPosition, mApps.getAdapterItems().size() - 1);
             int extraRows = 0;
             for (int i = 0; i <= adapterPosition; i++) {
                 if (!isViewType(items.get(i).viewType, VIEW_TYPE_MASK_ICON)) {
                     extraRows++;
                 }
             }
             return extraRows;
         }
     }

     /**
      * Helper class to size the grid items.
      */
     public class GridSpanSizer extends GridLayoutManager.SpanSizeLookup {

         public GridSpanSizer() {
             super();
             setSpanIndexCacheEnabled(true);
         }

         @Override
         public int getSpanSize(int position) {
             int viewType = mApps.getAdapterItems().get(position).viewType;
             int totalSpans = mGridLayoutMgr.getSpanCount();
             if (isIconViewType(viewType)) {
                 return totalSpans / mAppsPerRow;
             } else {
                 BaseAdapterProvider adapterProvider = getAdapterProvider(viewType);
                 if (adapterProvider != null) {
                     return totalSpans / adapterProvider.getItemsPerRow(viewType, mAppsPerRow);
                 }

                 // Section breaks span the full width
                 return totalSpans;
             }
         }
     }

     private final BaseDraggingActivity mLauncher;
     private final LayoutInflater mLayoutInflater;
     private final AlphabeticalAppsList mApps;
     private final GridLayoutManager mGridLayoutMgr;
     private final GridSpanSizer mGridSizer;

     private final OnClickListener mOnIconClickListener;
     private OnLongClickListener mOnIconLongClickListener = INSTANCE_ALL_APPS;

     private int mAppsPerRow;

     private OnFocusChangeListener mIconFocusListener;

     // The text to show when there are no search results and no market search handler.
     protected String mEmptySearchMessage;
     // The intent to send off to the market app, updated each time the search query changes.
     private Intent mMarketSearchIntent;

     public AllAppsGridAdapter(BaseDraggingActivity launcher, LayoutInflater inflater,
             AlphabeticalAppsList apps, BaseAdapterProvider[] adapterProviders) {
         Resources res = launcher.getResources();
         mLauncher = launcher;
         mApps = apps;
         mEmptySearchMessage = res.getString(R.string.all_apps_loading_message);
         mGridSizer = new GridSpanSizer();
         mGridLayoutMgr = new AppsGridLayoutManager(launcher);
         mGridLayoutMgr.setSpanSizeLookup(mGridSizer);
         mLayoutInflater = inflater;

         mOnIconClickListener = launcher.getItemOnClickListener();

         mAdapterProviders = adapterProviders;
         setAppsPerRow(mLauncher.getDeviceProfile().numShownAllAppsColumns);
     }

     public void setAppsPerRow(int appsPerRow) {
         mAppsPerRow = appsPerRow;
         int totalSpans = mAppsPerRow;
         for (BaseAdapterProvider adapterProvider : mAdapterProviders) {
             for (int itemPerRow : adapterProvider.getSupportedItemsPerRowArray()) {
                 if (totalSpans % itemPerRow != 0) {
                     totalSpans *= itemPerRow;
                 }
             }
         }
         mGridLayoutMgr.setSpanCount(totalSpans);
     }

     /**
      * Sets the long click listener for icons
      */
     public void setOnIconLongClickListener(@Nullable OnLongClickListener listener) {
         mOnIconLongClickListener = listener;
     }

     public static boolean isDividerViewType(int viewType) {
         return isViewType(viewType, VIEW_TYPE_MASK_DIVIDER);
     }

     public static boolean isIconViewType(int viewType) {
         return isViewType(viewType, VIEW_TYPE_MASK_ICON);
     }

     public static boolean isViewType(int viewType, int viewTypeMask) {
         return (viewType & viewTypeMask) != 0;
     }

     public void setIconFocusListener(OnFocusChangeListener focusListener) {
         mIconFocusListener = focusListener;
     }

     /**
      * Sets the last search query that was made, used to show when there are no results and to also
      * seed the intent for searching the market.
      */
     public void setLastSearchQuery(String query) {
         Resources res = mLauncher.getResources();
         mEmptySearchMessage = res.getString(R.string.all_apps_no_search_results, query);
         mMarketSearchIntent = PackageManagerHelper.getMarketSearchIntent(mLauncher, query);
     }

     /**
      * Returns the grid layout manager.
      */
     public GridLayoutManager getLayoutManager() {
         return mGridLayoutMgr;
     }

     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         switch (viewType) {
             case VIEW_TYPE_ICON:
                 BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate(
                         R.layout.all_apps_icon, parent, false);
                 icon.setLongPressTimeoutFactor(1f);
                 icon.setOnFocusChangeListener(mIconFocusListener);
                 icon.setOnClickListener(mOnIconClickListener);
                 icon.setOnLongClickListener(mOnIconLongClickListener);
                 // Ensure the all apps icon height matches the workspace icons in portrait mode.
                 icon.getLayoutParams().height = mLauncher.getDeviceProfile().allAppsCellHeightPx;
                 return new ViewHolder(icon);
             case VIEW_TYPE_EMPTY_SEARCH:
                 return new ViewHolder(mLayoutInflater.inflate(R.layout.all_apps_empty_search,
                         parent, false));
             case VIEW_TYPE_SEARCH_MARKET:
                 View searchMarketView = mLayoutInflater.inflate(R.layout.all_apps_search_market,
                         parent, false);
                 searchMarketView.setOnClickListener(v -> mLauncher.startActivitySafely(
                         v, mMarketSearchIntent, null));
                 return new ViewHolder(searchMarketView);
             case VIEW_TYPE_ALL_APPS_DIVIDER:
                 return new ViewHolder(mLayoutInflater.inflate(
                         R.layout.all_apps_divider, parent, false));
             default:
                 BaseAdapterProvider adapterProvider = getAdapterProvider(viewType);
                 if (adapterProvider != null) {
                     return adapterProvider.onCreateViewHolder(mLayoutInflater, parent, viewType);
                 }
                 throw new RuntimeException("Unexpected view type");
         }
     }

     @Override
     public void onBindViewHolder(ViewHolder holder, int position) {
         switch (holder.getItemViewType()) {
             case VIEW_TYPE_ICON:
                 AdapterItem adapterItem = mApps.getAdapterItems().get(position);
                 AppInfo info = adapterItem.appInfo;
                 BubbleTextView icon = (BubbleTextView) holder.itemView;
                 icon.reset();
                 icon.applyFromApplicationInfo(info);
                 break;
             case VIEW_TYPE_EMPTY_SEARCH:
                 TextView emptyViewText = (TextView) holder.itemView;
                 emptyViewText.setText(mEmptySearchMessage);
                 emptyViewText.setGravity(mApps.hasNoFilteredResults() ? Gravity.CENTER :
                         Gravity.START | Gravity.CENTER_VERTICAL);
                 break;
             case VIEW_TYPE_SEARCH_MARKET:
                 TextView searchView = (TextView) holder.itemView;
                 if (mMarketSearchIntent != null) {
                     searchView.setVisibility(View.VISIBLE);
                 } else {
                     searchView.setVisibility(View.GONE);
                 }
                 break;
             case VIEW_TYPE_ALL_APPS_DIVIDER:
                 // nothing to do
                 break;
             default:
                 BaseAdapterProvider adapterProvider = getAdapterProvider(holder.getItemViewType());
                 if (adapterProvider != null) {
                     adapterProvider.onBindView(holder, position);
                 }
         }
     }

     @Override
     public void onViewRecycled(@NonNull ViewHolder holder) {
         super.onViewRecycled(holder);
     }

     @Override
     public boolean onFailedToRecycleView(ViewHolder holder) {
         // Always recycle and we will reset the view when it is bound
         return true;
     }

     @Override
     public int getItemCount() {
         return mApps.getAdapterItems().size();
     }

     @Override
     public int getItemViewType(int position) {
         AdapterItem item = mApps.getAdapterItems().get(position);
         return item.viewType;
     }

     @Nullable
     private BaseAdapterProvider getAdapterProvider(int viewType) {
         return Arrays.stream(mAdapterProviders).filter(
                 adapterProvider -> adapterProvider.isViewSupported(viewType)).findFirst().orElse(
                 null);
     }
 }
	/*
	* Copyright (C) 2015 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.android.launcher3.allapps;

	import static com.android.launcher3.touch.ItemLongClickListener.INSTANCE_ALL_APPS;

	import android.content.Context;
	import android.content.Intent;
	import android.content.res.Resources;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.view.View.OnFocusChangeListener;
	import android.view.View.OnLongClickListener;
	import android.view.ViewGroup;
	import android.view.accessibility.AccessibilityEvent;
	import android.widget.TextView;

	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.core.view.accessibility.AccessibilityEventCompat;
	import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
	import androidx.core.view.accessibility.AccessibilityRecordCompat;
	import androidx.recyclerview.widget.GridLayoutManager;
	import androidx.recyclerview.widget.RecyclerView;

	import com.android.launcher3.BaseDraggingActivity;
	import com.android.launcher3.BubbleTextView;
	import com.android.launcher3.R;
	import com.android.launcher3.model.data.AppInfo;
	import com.android.launcher3.util.PackageManagerHelper;

	import java.util.Arrays;
	import java.util.List;

	/**
	* The grid view adapter of all the apps.
	*/
	public class AllAppsGridAdapter extends
	RecyclerView.Adapter<AllAppsGridAdapter.ViewHolder> {

	public static final String TAG = "AppsGridAdapter";

	// A normal icon
	public static final int VIEW_TYPE_ICON = 1 << 1;
	// The message shown when there are no filtered results
	public static final int VIEW_TYPE_EMPTY_SEARCH = 1 << 2;
	// The message to continue to a market search when there are no filtered results
	public static final int VIEW_TYPE_SEARCH_MARKET = 1 << 3;

	// We use various dividers for various purposes. They share enough attributes to reuse layouts,
	// but differ in enough attributes to require different view types

	// A divider that separates the apps list and the search market button
	public static final int VIEW_TYPE_ALL_APPS_DIVIDER = 1 << 4;

	// Common view type masks
	public static final int VIEW_TYPE_MASK_DIVIDER = VIEW_TYPE_ALL_APPS_DIVIDER;
	public static final int VIEW_TYPE_MASK_ICON = VIEW_TYPE_ICON;


	private final BaseAdapterProvider[] mAdapterProviders;

	/**
	* ViewHolder for each icon.
	*/
	public static class ViewHolder extends RecyclerView.ViewHolder {

	public ViewHolder(View v) {
	super(v);
	}
	}

	/**
	* Info about a particular adapter item (can be either section or app)
	*/
	public static class AdapterItem {
	/** Common properties */
	// The index of this adapter item in the list
	public int position;
	// The type of this item
	public int viewType;

	/** App-only properties */
	// The section name of this app. Note that there can be multiple items with different
	// sectionNames in the same section
	public String sectionName = null;
	// The row that this item shows up on
	public int rowIndex;
	// The index of this app in the row
	public int rowAppIndex;
	// The associated AppInfo for the app
	public AppInfo appInfo = null;
	// The index of this app not including sections
	public int appIndex = -1;
	// Search section associated to result
	public DecorationInfo decorationInfo = null;

	/**
	* Factory method for AppIcon AdapterItem
	*/
	public static AdapterItem asApp(int pos, String sectionName, AppInfo appInfo,
	int appIndex) {
	AdapterItem item = new AdapterItem();
	item.viewType = VIEW_TYPE_ICON;
	item.position = pos;
	item.sectionName = sectionName;
	item.appInfo = appInfo;
	item.appIndex = appIndex;
	return item;
	}

	/**
	* Factory method for empty search results view
	*/
	public static AdapterItem asEmptySearch(int pos) {
	AdapterItem item = new AdapterItem();
	item.viewType = VIEW_TYPE_EMPTY_SEARCH;
	item.position = pos;
	return item;
	}

	/**
	* Factory method for a dividerView in AllAppsSearch
	*/
	public static AdapterItem asAllAppsDivider(int pos) {
	AdapterItem item = new AdapterItem();
	item.viewType = VIEW_TYPE_ALL_APPS_DIVIDER;
	item.position = pos;
	return item;
	}

	/**
	* Factory method for a market search button
	*/
	public static AdapterItem asMarketSearch(int pos) {
	AdapterItem item = new AdapterItem();
	item.viewType = VIEW_TYPE_SEARCH_MARKET;
	item.position = pos;
	return item;
	}

	protected boolean isCountedForAccessibility() {
	return viewType == VIEW_TYPE_ICON \|\| viewType == VIEW_TYPE_SEARCH_MARKET;
	}
	}

	/**
	* A subclass of GridLayoutManager that overrides accessibility values during app search.
	*/
	public class AppsGridLayoutManager extends GridLayoutManager {

	public AppsGridLayoutManager(Context context) {
	super(context, 1, GridLayoutManager.VERTICAL, false);
	}

	@Override
	public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
	super.onInitializeAccessibilityEvent(event);

	// Ensure that we only report the number apps for accessibility not including other
	// adapter views
	final AccessibilityRecordCompat record = AccessibilityEventCompat
	.asRecord(event);
	record.setItemCount(mApps.getNumFilteredApps());
	record.setFromIndex(Math.max(0,
	record.getFromIndex() - getRowsNotForAccessibility(record.getFromIndex())));
	record.setToIndex(Math.max(0,
	record.getToIndex() - getRowsNotForAccessibility(record.getToIndex())));
	}

	@Override
	public int getRowCountForAccessibility(RecyclerView.Recycler recycler,
	RecyclerView.State state) {
	return super.getRowCountForAccessibility(recycler, state) -
	getRowsNotForAccessibility(mApps.getAdapterItems().size() - 1);
	}

	@Override
	public void onInitializeAccessibilityNodeInfoForItem(RecyclerView.Recycler recycler,
	RecyclerView.State state, View host, AccessibilityNodeInfoCompat info) {
	super.onInitializeAccessibilityNodeInfoForItem(recycler, state, host, info);

	ViewGroup.LayoutParams lp = host.getLayoutParams();
	AccessibilityNodeInfoCompat.CollectionItemInfoCompat cic = info.getCollectionItemInfo();
	if (!(lp instanceof LayoutParams) \|\| (cic == null)) {
	return;
	}
	LayoutParams glp = (LayoutParams) lp;
	info.setCollectionItemInfo(AccessibilityNodeInfoCompat.CollectionItemInfoCompat.obtain(
	cic.getRowIndex() - getRowsNotForAccessibility(glp.getViewAdapterPosition()),
	cic.getRowSpan(),
	cic.getColumnIndex(),
	cic.getColumnSpan(),
	cic.isHeading(),
	cic.isSelected()));
	}

	/**
	* Returns the number of rows before {@param adapterPosition}, including this position
	* which should not be counted towards the collection info.
	*/
	private int getRowsNotForAccessibility(int adapterPosition) {
	List<AdapterItem> items = mApps.getAdapterItems();
	adapterPosition = Math.max(adapterPosition, mApps.getAdapterItems().size() - 1);
	int extraRows = 0;
	for (int i = 0; i <= adapterPosition; i++) {
	if (!isViewType(items.get(i).viewType, VIEW_TYPE_MASK_ICON)) {
	extraRows++;
	}
	}
	return extraRows;
	}
	}

	/**
	* Helper class to size the grid items.
	*/
	public class GridSpanSizer extends GridLayoutManager.SpanSizeLookup {

	public GridSpanSizer() {
	super();
	setSpanIndexCacheEnabled(true);
	}

	@Override
	public int getSpanSize(int position) {
	int viewType = mApps.getAdapterItems().get(position).viewType;
	int totalSpans = mGridLayoutMgr.getSpanCount();
	if (isIconViewType(viewType)) {
	return totalSpans / mAppsPerRow;
	} else {
	BaseAdapterProvider adapterProvider = getAdapterProvider(viewType);
	if (adapterProvider != null) {
	return totalSpans / adapterProvider.getItemsPerRow(viewType, mAppsPerRow);
	}

	// Section breaks span the full width
	return totalSpans;
	}
	}
	}

	private final BaseDraggingActivity mLauncher;
	private final LayoutInflater mLayoutInflater;
	private final AlphabeticalAppsList mApps;
	private final GridLayoutManager mGridLayoutMgr;
	private final GridSpanSizer mGridSizer;

	private final OnClickListener mOnIconClickListener;
	private OnLongClickListener mOnIconLongClickListener = INSTANCE_ALL_APPS;

	private int mAppsPerRow;

	private OnFocusChangeListener mIconFocusListener;

	// The text to show when there are no search results and no market search handler.
	protected String mEmptySearchMessage;
	// The intent to send off to the market app, updated each time the search query changes.
	private Intent mMarketSearchIntent;

	public AllAppsGridAdapter(BaseDraggingActivity launcher, LayoutInflater inflater,
	AlphabeticalAppsList apps, BaseAdapterProvider[] adapterProviders) {
	Resources res = launcher.getResources();
	mLauncher = launcher;
	mApps = apps;
	mEmptySearchMessage = res.getString(R.string.all_apps_loading_message);
	mGridSizer = new GridSpanSizer();
	mGridLayoutMgr = new AppsGridLayoutManager(launcher);
	mGridLayoutMgr.setSpanSizeLookup(mGridSizer);
	mLayoutInflater = inflater;

	mOnIconClickListener = launcher.getItemOnClickListener();

	mAdapterProviders = adapterProviders;
	setAppsPerRow(mLauncher.getDeviceProfile().numShownAllAppsColumns);
	}

	public void setAppsPerRow(int appsPerRow) {
	mAppsPerRow = appsPerRow;
	int totalSpans = mAppsPerRow;
	for (BaseAdapterProvider adapterProvider : mAdapterProviders) {
	for (int itemPerRow : adapterProvider.getSupportedItemsPerRowArray()) {
	if (totalSpans % itemPerRow != 0) {
	totalSpans *= itemPerRow;
	}
	}
	}
	mGridLayoutMgr.setSpanCount(totalSpans);
	}

	/**
	* Sets the long click listener for icons
	*/
	public void setOnIconLongClickListener(@Nullable OnLongClickListener listener) {
	mOnIconLongClickListener = listener;
	}

	public static boolean isDividerViewType(int viewType) {
	return isViewType(viewType, VIEW_TYPE_MASK_DIVIDER);
	}

	public static boolean isIconViewType(int viewType) {
	return isViewType(viewType, VIEW_TYPE_MASK_ICON);
	}

	public static boolean isViewType(int viewType, int viewTypeMask) {
	return (viewType & viewTypeMask) != 0;
	}

	public void setIconFocusListener(OnFocusChangeListener focusListener) {
	mIconFocusListener = focusListener;
	}

	/**
	* Sets the last search query that was made, used to show when there are no results and to also
	* seed the intent for searching the market.
	*/
	public void setLastSearchQuery(String query) {
	Resources res = mLauncher.getResources();
	mEmptySearchMessage = res.getString(R.string.all_apps_no_search_results, query);
	mMarketSearchIntent = PackageManagerHelper.getMarketSearchIntent(mLauncher, query);
	}

	/**
	* Returns the grid layout manager.
	*/
	public GridLayoutManager getLayoutManager() {
	return mGridLayoutMgr;
	}

	@Override
	public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	switch (viewType) {
	case VIEW_TYPE_ICON:
	BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate(
	R.layout.all_apps_icon, parent, false);
	icon.setLongPressTimeoutFactor(1f);
	icon.setOnFocusChangeListener(mIconFocusListener);
	icon.setOnClickListener(mOnIconClickListener);
	icon.setOnLongClickListener(mOnIconLongClickListener);
	// Ensure the all apps icon height matches the workspace icons in portrait mode.
	icon.getLayoutParams().height = mLauncher.getDeviceProfile().allAppsCellHeightPx;
	return new ViewHolder(icon);
	case VIEW_TYPE_EMPTY_SEARCH:
	return new ViewHolder(mLayoutInflater.inflate(R.layout.all_apps_empty_search,
	parent, false));
	case VIEW_TYPE_SEARCH_MARKET:
	View searchMarketView = mLayoutInflater.inflate(R.layout.all_apps_search_market,
	parent, false);
	searchMarketView.setOnClickListener(v -> mLauncher.startActivitySafely(
	v, mMarketSearchIntent, null));
	return new ViewHolder(searchMarketView);
	case VIEW_TYPE_ALL_APPS_DIVIDER:
	return new ViewHolder(mLayoutInflater.inflate(
	R.layout.all_apps_divider, parent, false));
	default:
	BaseAdapterProvider adapterProvider = getAdapterProvider(viewType);
	if (adapterProvider != null) {
	return adapterProvider.onCreateViewHolder(mLayoutInflater, parent, viewType);
	}
	throw new RuntimeException("Unexpected view type");
	}
	}

	@Override
	public void onBindViewHolder(ViewHolder holder, int position) {
	switch (holder.getItemViewType()) {
	case VIEW_TYPE_ICON:
	AdapterItem adapterItem = mApps.getAdapterItems().get(position);
	AppInfo info = adapterItem.appInfo;
	BubbleTextView icon = (BubbleTextView) holder.itemView;
	icon.reset();
	icon.applyFromApplicationInfo(info);
	break;
	case VIEW_TYPE_EMPTY_SEARCH:
	TextView emptyViewText = (TextView) holder.itemView;
	emptyViewText.setText(mEmptySearchMessage);
	emptyViewText.setGravity(mApps.hasNoFilteredResults() ? Gravity.CENTER :
	Gravity.START \| Gravity.CENTER_VERTICAL);
	break;
	case VIEW_TYPE_SEARCH_MARKET:
	TextView searchView = (TextView) holder.itemView;
	if (mMarketSearchIntent != null) {
	searchView.setVisibility(View.VISIBLE);
	} else {
	searchView.setVisibility(View.GONE);
	}
	break;
	case VIEW_TYPE_ALL_APPS_DIVIDER:
	// nothing to do
	break;
	default:
	BaseAdapterProvider adapterProvider = getAdapterProvider(holder.getItemViewType());
	if (adapterProvider != null) {
	adapterProvider.onBindView(holder, position);
	}
	}
	}

	@Override
	public void onViewRecycled(@NonNull ViewHolder holder) {
	super.onViewRecycled(holder);
	}

	@Override
	public boolean onFailedToRecycleView(ViewHolder holder) {
	// Always recycle and we will reset the view when it is bound
	return true;
	}

	@Override
	public int getItemCount() {
	return mApps.getAdapterItems().size();
	}

	@Override
	public int getItemViewType(int position) {
	AdapterItem item = mApps.getAdapterItems().get(position);
	return item.viewType;
	}

	@Nullable
	private BaseAdapterProvider getAdapterProvider(int viewType) {
	return Arrays.stream(mAdapterProviders).filter(
	adapterProvider -> adapterProvider.isViewSupported(viewType)).findFirst().orElse(
	null);
	}
	}