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 android.content.Context;
 import android.content.Intent;
 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.PointF;
 import android.graphics.Rect;
 import android.support.v4.view.accessibility.AccessibilityEventCompat;
 import android.support.v4.view.accessibility.AccessibilityRecordCompat;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnFocusChangeListener;
 import android.view.ViewConfiguration;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.TextView;

 import com.android.launcher3.AppInfo;
 import com.android.launcher3.BubbleTextView;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.shortcuts.DeepShortcutManager;
 import com.android.launcher3.shortcuts.ShortcutsContainerListener;

 import java.util.HashMap;
 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";
     private static final boolean DEBUG = false;

     // A section break in the grid
     public static final int VIEW_TYPE_SECTION_BREAK = 1 << 0;
     // A normal icon
     public static final int VIEW_TYPE_ICON = 1 << 1;
     // A prediction icon
     public static final int VIEW_TYPE_PREDICTION_ICON = 1 << 2;
     // The message shown when there are no filtered results
     public static final int VIEW_TYPE_EMPTY_SEARCH = 1 << 3;
     // A divider that separates the apps list and the search market button
     public static final int VIEW_TYPE_SEARCH_MARKET = 1 << 4;

     // 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_SEARCH_MARKET_DIVIDER = 1 << 5;
     // The divider under the search field
     public static final int VIEW_TYPE_SEARCH_DIVIDER = 1 << 6;
     // The divider that separates prediction icons from the app list
     public static final int VIEW_TYPE_PREDICTION_DIVIDER = 1 << 7;

     // Common view type masks
     public static final int VIEW_TYPE_MASK_DIVIDER = VIEW_TYPE_SEARCH_DIVIDER
             | VIEW_TYPE_SEARCH_MARKET_DIVIDER
             | VIEW_TYPE_PREDICTION_DIVIDER
             | VIEW_TYPE_SECTION_BREAK;
     public static final int VIEW_TYPE_MASK_ICON = VIEW_TYPE_ICON
             | VIEW_TYPE_PREDICTION_ICON;


     public interface BindViewCallback {
         public void onBindView(ViewHolder holder);
     }

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

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

     /**
      * 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());
         }

         @Override
         public int getRowCountForAccessibility(RecyclerView.Recycler recycler,
                 RecyclerView.State state) {
             if (mApps.hasNoFilteredResults()) {
                 // Disregard the no-search-results text as a list item for accessibility
                 return 0;
             } else {
                 return super.getRowCountForAccessibility(recycler, state);
             }
         }
     }

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

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

         @Override
         public int getSpanSize(int position) {
             if (isIconViewType(mApps.getAdapterItems().get(position).viewType)) {
                 return 1;
             } else {
                     // Section breaks span the full width
                     return mAppsPerRow;
             }
         }
     }

     /**
      * Helper class to draw the section headers
      */
     public class GridItemDecoration extends RecyclerView.ItemDecoration {

         private static final boolean DEBUG_SECTION_MARGIN = false;
         private static final boolean FADE_OUT_SECTIONS = false;

         private HashMap<String, PointF> mCachedSectionBounds = new HashMap<>();
         private Rect mTmpBounds = new Rect();

         @Override
         public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
             if (mApps.hasFilter() || mAppsPerRow == 0) {
                 return;
             }

             if (DEBUG_SECTION_MARGIN) {
                 Paint p = new Paint();
                 p.setColor(0x33ff0000);
                 c.drawRect(mBackgroundPadding.left, 0, mBackgroundPadding.left + mSectionNamesMargin,
                         parent.getMeasuredHeight(), p);
             }

             List<AlphabeticalAppsList.AdapterItem> items = mApps.getAdapterItems();
             boolean showSectionNames = mSectionNamesMargin > 0;
             int childCount = parent.getChildCount();
             int lastSectionTop = 0;
             int lastSectionHeight = 0;
             for (int i = 0; i < childCount; i++) {
                 View child = parent.getChildAt(i);
                 ViewHolder holder = (ViewHolder) parent.getChildViewHolder(child);
                 if (!isValidHolderAndChild(holder, child, items)) {
                     continue;
                 }

                 if (showSectionNames && shouldDrawItemSection(holder, i, items)) {
                     // At this point, we only draw sections for each section break;
                     int viewTopOffset = (2 * child.getPaddingTop());
                     int pos = holder.getPosition();
                     AlphabeticalAppsList.AdapterItem item = items.get(pos);
                     AlphabeticalAppsList.SectionInfo sectionInfo = item.sectionInfo;

                     // Draw all the sections for this index
                     String lastSectionName = item.sectionName;
                     for (int j = item.sectionAppIndex; j < sectionInfo.numApps; j++, pos++) {
                         AlphabeticalAppsList.AdapterItem nextItem = items.get(pos);
                         String sectionName = nextItem.sectionName;
                         if (nextItem.sectionInfo != sectionInfo) {
                             break;
                         }
                         if (j > item.sectionAppIndex && sectionName.equals(lastSectionName)) {
                             continue;
                         }

                         // Find the section name bounds
                         PointF sectionBounds = getAndCacheSectionBounds(sectionName);

                         // Calculate where to draw the section
                         int sectionBaseline = (int) (viewTopOffset + sectionBounds.y);
                         int x = mIsRtl ?
                                 parent.getWidth() - mBackgroundPadding.left - mSectionNamesMargin :
                                 mBackgroundPadding.left;
                         x += (int) ((mSectionNamesMargin - sectionBounds.x) / 2f);
                         int y = child.getTop() + sectionBaseline;

                         // Determine whether this is the last row with apps in that section, if
                         // so, then fix the section to the row allowing it to scroll past the
                         // baseline, otherwise, bound it to the baseline so it's in the viewport
                         int appIndexInSection = items.get(pos).sectionAppIndex;
                         int nextRowPos = Math.min(items.size() - 1,
                                 pos + mAppsPerRow - (appIndexInSection % mAppsPerRow));
                         AlphabeticalAppsList.AdapterItem nextRowItem = items.get(nextRowPos);
                         boolean fixedToRow = !sectionName.equals(nextRowItem.sectionName);
                         if (!fixedToRow) {
                             y = Math.max(sectionBaseline, y);
                         }

                         // In addition, if it overlaps with the last section that was drawn, then
                         // offset it so that it does not overlap
                         if (lastSectionHeight > 0 && y <= (lastSectionTop + lastSectionHeight)) {
                             y += lastSectionTop - y + lastSectionHeight;
                         }

                         // Draw the section header
                         if (FADE_OUT_SECTIONS) {
                             int alpha = 255;
                             if (fixedToRow) {
                                 alpha = Math.min(255,
                                         (int) (255 * (Math.max(0, y) / (float) sectionBaseline)));
                             }
                             mSectionTextPaint.setAlpha(alpha);
                         }
                         c.drawText(sectionName, x, y, mSectionTextPaint);

                         lastSectionTop = y;
                         lastSectionHeight = (int) (sectionBounds.y + mSectionHeaderOffset);
                         lastSectionName = sectionName;
                     }
                     i += (sectionInfo.numApps - item.sectionAppIndex);
                 }
             }
         }

         @Override
         public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
                 RecyclerView.State state) {
             // Do nothing
         }

         /**
          * Given a section name, return the bounds of the given section name.
          */
         private PointF getAndCacheSectionBounds(String sectionName) {
             PointF bounds = mCachedSectionBounds.get(sectionName);
             if (bounds == null) {
                 mSectionTextPaint.getTextBounds(sectionName, 0, sectionName.length(), mTmpBounds);
                 bounds = new PointF(mSectionTextPaint.measureText(sectionName), mTmpBounds.height());
                 mCachedSectionBounds.put(sectionName, bounds);
             }
             return bounds;
         }

         /**
          * Returns whether we consider this a valid view holder for us to draw a divider or section for.
          */
         private boolean isValidHolderAndChild(ViewHolder holder, View child,
                 List<AlphabeticalAppsList.AdapterItem> items) {
             // Ensure item is not already removed
             GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams)
                     child.getLayoutParams();
             if (lp.isItemRemoved()) {
                 return false;
             }
             // Ensure we have a valid holder
             if (holder == null) {
                 return false;
             }
             // Ensure we have a holder position
             int pos = holder.getPosition();
             if (pos < 0 || pos >= items.size()) {
                 return false;
             }
             return true;
         }

         /**
          * Returns whether to draw the section for the given child.
          */
         private boolean shouldDrawItemSection(ViewHolder holder, int childIndex,
                 List<AlphabeticalAppsList.AdapterItem> items) {
             int pos = holder.getPosition();
             AlphabeticalAppsList.AdapterItem item = items.get(pos);

             // Ensure it's an icon
             if (item.viewType != AllAppsGridAdapter.VIEW_TYPE_ICON) {
                 return false;
             }
             // Draw the section header for the first item in each section
             return (childIndex == 0) ||
                     (items.get(pos - 1).viewType == AllAppsGridAdapter.VIEW_TYPE_SECTION_BREAK);
         }
     }

     private final Launcher mLauncher;
     private final LayoutInflater mLayoutInflater;
     private final AlphabeticalAppsList mApps;
     private final GridLayoutManager mGridLayoutMgr;
     private final GridSpanSizer mGridSizer;
     private final GridItemDecoration mItemDecoration;
     private final View.OnClickListener mIconClickListener;
     private final View.OnLongClickListener mIconLongClickListener;

     private final Rect mBackgroundPadding = new Rect();
     private final boolean mIsRtl;

     // Section drawing
     private final int mSectionNamesMargin;
     private final int mSectionHeaderOffset;
     private final Paint mSectionTextPaint;

     private int mAppsPerRow;

     private BindViewCallback mBindViewCallback;
     private AllAppsSearchBarController mSearchController;
     private OnFocusChangeListener mIconFocusListener;

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

     public AllAppsGridAdapter(Launcher launcher, AlphabeticalAppsList apps, View.OnClickListener
             iconClickListener, View.OnLongClickListener iconLongClickListener) {
         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);
         mItemDecoration = new GridItemDecoration();
         mLayoutInflater = LayoutInflater.from(launcher);
         mIconClickListener = iconClickListener;
         mIconLongClickListener = iconLongClickListener;
         mSectionNamesMargin = res.getDimensionPixelSize(R.dimen.all_apps_grid_view_start_margin);
         mSectionHeaderOffset = res.getDimensionPixelSize(R.dimen.all_apps_grid_section_y_offset);
         mIsRtl = Utilities.isRtl(res);

         mSectionTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
         mSectionTextPaint.setTextSize(res.getDimensionPixelSize(
                 R.dimen.all_apps_grid_section_text_size));
         mSectionTextPaint.setColor(Utilities.getColorAccent(launcher));
     }

     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 isPredictionIconViewType(int viewType) {
         return isViewType(viewType, VIEW_TYPE_PREDICTION_ICON);
     }

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

     /**
      * Sets the number of apps per row.
      */
     public void setNumAppsPerRow(int appsPerRow) {
         mAppsPerRow = appsPerRow;
         mGridLayoutMgr.setSpanCount(appsPerRow);
     }

     public void setSearchController(AllAppsSearchBarController searchController) {
         mSearchController = searchController;
     }

     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 = mSearchController.createMarketSearchIntent(query);
     }

     /**
      * Sets the callback for when views are bound.
      */
     public void setBindViewCallback(BindViewCallback cb) {
         mBindViewCallback = cb;
     }

     /**
      * Notifies the adapter of the background padding so that it can draw things correctly in the
      * item decorator.
      */
     public void updateBackgroundPadding(Rect padding) {
         mBackgroundPadding.set(padding);
     }

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

     /**
      * Returns the item decoration for the recycler view.
      */
     public RecyclerView.ItemDecoration getItemDecoration() {
         // We don't draw any headers when we are uncomfortably dense
         return mItemDecoration;
     }

     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         switch (viewType) {
             case VIEW_TYPE_SECTION_BREAK:
                 return new ViewHolder(new View(parent.getContext()));
             case VIEW_TYPE_ICON:
                 /* falls through */
             case VIEW_TYPE_PREDICTION_ICON: {
                 BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate(
                         R.layout.all_apps_icon, parent, false);
                 icon.setOnClickListener(mIconClickListener);
                 icon.setOnLongClickListener(mIconLongClickListener);
                 icon.setLongPressTimeout(ViewConfiguration.get(parent.getContext())
                         .getLongPressTimeout());
                 icon.setOnFocusChangeListener(mIconFocusListener);
                 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(new View.OnClickListener() {
                     @Override
                     public void onClick(View v) {
                         mLauncher.startActivitySafely(v, mMarketSearchIntent, null);
                     }
                 });
                 return new ViewHolder(searchMarketView);
             case VIEW_TYPE_SEARCH_DIVIDER:
                 return new ViewHolder(mLayoutInflater.inflate(
                         R.layout.all_apps_search_divider, parent, false));
             case VIEW_TYPE_PREDICTION_DIVIDER:
                 /* falls through */
             case VIEW_TYPE_SEARCH_MARKET_DIVIDER:
                 return new ViewHolder(mLayoutInflater.inflate(
                         R.layout.all_apps_divider, parent, false));
             default:
                 throw new RuntimeException("Unexpected view type");
         }
     }

     @Override
     public void onBindViewHolder(ViewHolder holder, int position) {
         switch (holder.getItemViewType()) {
             case VIEW_TYPE_ICON: {
                 AppInfo info = mApps.getAdapterItems().get(position).appInfo;
                 BubbleTextView icon = (BubbleTextView) holder.mContent;
                 icon.applyFromApplicationInfo(info);
                 if (DeepShortcutManager.supportsShortcuts(info)) {
                     // TODO: only add this listener if the item has shortcuts associated with it.
                     icon.setOnTouchListener(new ShortcutsContainerListener(icon));
                 }
                 icon.setAccessibilityDelegate(mLauncher.getAccessibilityDelegate());
                 break;
             }
             case VIEW_TYPE_PREDICTION_ICON: {
                 AppInfo info = mApps.getAdapterItems().get(position).appInfo;
                 BubbleTextView icon = (BubbleTextView) holder.mContent;
                 icon.applyFromApplicationInfo(info);
                 if (DeepShortcutManager.supportsShortcuts(info)) {
                     // TODO: only add this listener if the item has shortcuts associated with it.
                     icon.setOnTouchListener(new ShortcutsContainerListener(icon));
                 }
                 icon.setAccessibilityDelegate(mLauncher.getAccessibilityDelegate());
                 break;
             }
             case VIEW_TYPE_EMPTY_SEARCH:
                 TextView emptyViewText = (TextView) holder.mContent;
                 emptyViewText.setText(mEmptySearchMessage);
                 emptyViewText.setGravity(mApps.hasNoFilteredResults() ? Gravity.CENTER :
                         Gravity.START | Gravity.CENTER_VERTICAL);
                 break;
             case VIEW_TYPE_SEARCH_MARKET:
                 TextView searchView = (TextView) holder.mContent;
                 if (mMarketSearchIntent != null) {
                     searchView.setVisibility(View.VISIBLE);
                     searchView.setGravity(mApps.hasNoFilteredResults() ? Gravity.CENTER :
                             Gravity.START | Gravity.CENTER_VERTICAL);
                 } else {
                     searchView.setVisibility(View.GONE);
                 }
                 break;
         }
         if (mBindViewCallback != null) {
             mBindViewCallback.onBindView(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) {
         AlphabeticalAppsList.AdapterItem item = mApps.getAdapterItems().get(position);
         return item.viewType;
     }
 }
	/*
	* 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 android.content.Context;
	import android.content.Intent;
	import android.content.res.Resources;
	import android.graphics.Canvas;
	import android.graphics.Paint;
	import android.graphics.PointF;
	import android.graphics.Rect;
	import android.support.v4.view.accessibility.AccessibilityEventCompat;
	import android.support.v4.view.accessibility.AccessibilityRecordCompat;
	import android.support.v7.widget.GridLayoutManager;
	import android.support.v7.widget.RecyclerView;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.View.OnFocusChangeListener;
	import android.view.ViewConfiguration;
	import android.view.ViewGroup;
	import android.view.accessibility.AccessibilityEvent;
	import android.widget.TextView;

	import com.android.launcher3.AppInfo;
	import com.android.launcher3.BubbleTextView;
	import com.android.launcher3.Launcher;
	import com.android.launcher3.R;
	import com.android.launcher3.Utilities;
	import com.android.launcher3.shortcuts.DeepShortcutManager;
	import com.android.launcher3.shortcuts.ShortcutsContainerListener;

	import java.util.HashMap;
	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";
	private static final boolean DEBUG = false;

	// A section break in the grid
	public static final int VIEW_TYPE_SECTION_BREAK = 1 << 0;
	// A normal icon
	public static final int VIEW_TYPE_ICON = 1 << 1;
	// A prediction icon
	public static final int VIEW_TYPE_PREDICTION_ICON = 1 << 2;
	// The message shown when there are no filtered results
	public static final int VIEW_TYPE_EMPTY_SEARCH = 1 << 3;
	// A divider that separates the apps list and the search market button
	public static final int VIEW_TYPE_SEARCH_MARKET = 1 << 4;

	// 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_SEARCH_MARKET_DIVIDER = 1 << 5;
	// The divider under the search field
	public static final int VIEW_TYPE_SEARCH_DIVIDER = 1 << 6;
	// The divider that separates prediction icons from the app list
	public static final int VIEW_TYPE_PREDICTION_DIVIDER = 1 << 7;

	// Common view type masks
	public static final int VIEW_TYPE_MASK_DIVIDER = VIEW_TYPE_SEARCH_DIVIDER
	\| VIEW_TYPE_SEARCH_MARKET_DIVIDER
	\| VIEW_TYPE_PREDICTION_DIVIDER
	\| VIEW_TYPE_SECTION_BREAK;
	public static final int VIEW_TYPE_MASK_ICON = VIEW_TYPE_ICON
	\| VIEW_TYPE_PREDICTION_ICON;


	public interface BindViewCallback {
	public void onBindView(ViewHolder holder);
	}

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

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

	/**
	* 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());
	}

	@Override
	public int getRowCountForAccessibility(RecyclerView.Recycler recycler,
	RecyclerView.State state) {
	if (mApps.hasNoFilteredResults()) {
	// Disregard the no-search-results text as a list item for accessibility
	return 0;
	} else {
	return super.getRowCountForAccessibility(recycler, state);
	}
	}
	}

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

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

	@Override
	public int getSpanSize(int position) {
	if (isIconViewType(mApps.getAdapterItems().get(position).viewType)) {
	return 1;
	} else {
	// Section breaks span the full width
	return mAppsPerRow;
	}
	}
	}

	/**
	* Helper class to draw the section headers
	*/
	public class GridItemDecoration extends RecyclerView.ItemDecoration {

	private static final boolean DEBUG_SECTION_MARGIN = false;
	private static final boolean FADE_OUT_SECTIONS = false;

	private HashMap<String, PointF> mCachedSectionBounds = new HashMap<>();
	private Rect mTmpBounds = new Rect();

	@Override
	public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
	if (mApps.hasFilter() \|\| mAppsPerRow == 0) {
	return;
	}

	if (DEBUG_SECTION_MARGIN) {
	Paint p = new Paint();
	p.setColor(0x33ff0000);
	c.drawRect(mBackgroundPadding.left, 0, mBackgroundPadding.left + mSectionNamesMargin,
	parent.getMeasuredHeight(), p);
	}

	List<AlphabeticalAppsList.AdapterItem> items = mApps.getAdapterItems();
	boolean showSectionNames = mSectionNamesMargin > 0;
	int childCount = parent.getChildCount();
	int lastSectionTop = 0;
	int lastSectionHeight = 0;
	for (int i = 0; i < childCount; i++) {
	View child = parent.getChildAt(i);
	ViewHolder holder = (ViewHolder) parent.getChildViewHolder(child);
	if (!isValidHolderAndChild(holder, child, items)) {
	continue;
	}

	if (showSectionNames && shouldDrawItemSection(holder, i, items)) {
	// At this point, we only draw sections for each section break;
	int viewTopOffset = (2 * child.getPaddingTop());
	int pos = holder.getPosition();
	AlphabeticalAppsList.AdapterItem item = items.get(pos);
	AlphabeticalAppsList.SectionInfo sectionInfo = item.sectionInfo;

	// Draw all the sections for this index
	String lastSectionName = item.sectionName;
	for (int j = item.sectionAppIndex; j < sectionInfo.numApps; j++, pos++) {
	AlphabeticalAppsList.AdapterItem nextItem = items.get(pos);
	String sectionName = nextItem.sectionName;
	if (nextItem.sectionInfo != sectionInfo) {
	break;
	}
	if (j > item.sectionAppIndex && sectionName.equals(lastSectionName)) {
	continue;
	}

	// Find the section name bounds
	PointF sectionBounds = getAndCacheSectionBounds(sectionName);

	// Calculate where to draw the section
	int sectionBaseline = (int) (viewTopOffset + sectionBounds.y);
	int x = mIsRtl ?
	parent.getWidth() - mBackgroundPadding.left - mSectionNamesMargin :
	mBackgroundPadding.left;
	x += (int) ((mSectionNamesMargin - sectionBounds.x) / 2f);
	int y = child.getTop() + sectionBaseline;

	// Determine whether this is the last row with apps in that section, if
	// so, then fix the section to the row allowing it to scroll past the
	// baseline, otherwise, bound it to the baseline so it's in the viewport
	int appIndexInSection = items.get(pos).sectionAppIndex;
	int nextRowPos = Math.min(items.size() - 1,
	pos + mAppsPerRow - (appIndexInSection % mAppsPerRow));
	AlphabeticalAppsList.AdapterItem nextRowItem = items.get(nextRowPos);
	boolean fixedToRow = !sectionName.equals(nextRowItem.sectionName);
	if (!fixedToRow) {
	y = Math.max(sectionBaseline, y);
	}

	// In addition, if it overlaps with the last section that was drawn, then
	// offset it so that it does not overlap
	if (lastSectionHeight > 0 && y <= (lastSectionTop + lastSectionHeight)) {
	y += lastSectionTop - y + lastSectionHeight;
	}

	// Draw the section header
	if (FADE_OUT_SECTIONS) {
	int alpha = 255;
	if (fixedToRow) {
	alpha = Math.min(255,
	(int) (255 * (Math.max(0, y) / (float) sectionBaseline)));
	}
	mSectionTextPaint.setAlpha(alpha);
	}
	c.drawText(sectionName, x, y, mSectionTextPaint);

	lastSectionTop = y;
	lastSectionHeight = (int) (sectionBounds.y + mSectionHeaderOffset);
	lastSectionName = sectionName;
	}
	i += (sectionInfo.numApps - item.sectionAppIndex);
	}
	}
	}

	@Override
	public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
	RecyclerView.State state) {
	// Do nothing
	}

	/**
	* Given a section name, return the bounds of the given section name.
	*/
	private PointF getAndCacheSectionBounds(String sectionName) {
	PointF bounds = mCachedSectionBounds.get(sectionName);
	if (bounds == null) {
	mSectionTextPaint.getTextBounds(sectionName, 0, sectionName.length(), mTmpBounds);
	bounds = new PointF(mSectionTextPaint.measureText(sectionName), mTmpBounds.height());
	mCachedSectionBounds.put(sectionName, bounds);
	}
	return bounds;
	}

	/**
	* Returns whether we consider this a valid view holder for us to draw a divider or section for.
	*/
	private boolean isValidHolderAndChild(ViewHolder holder, View child,
	List<AlphabeticalAppsList.AdapterItem> items) {
	// Ensure item is not already removed
	GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams)
	child.getLayoutParams();
	if (lp.isItemRemoved()) {
	return false;
	}
	// Ensure we have a valid holder
	if (holder == null) {
	return false;
	}
	// Ensure we have a holder position
	int pos = holder.getPosition();
	if (pos < 0 \|\| pos >= items.size()) {
	return false;
	}
	return true;
	}

	/**
	* Returns whether to draw the section for the given child.
	*/
	private boolean shouldDrawItemSection(ViewHolder holder, int childIndex,
	List<AlphabeticalAppsList.AdapterItem> items) {
	int pos = holder.getPosition();
	AlphabeticalAppsList.AdapterItem item = items.get(pos);

	// Ensure it's an icon
	if (item.viewType != AllAppsGridAdapter.VIEW_TYPE_ICON) {
	return false;
	}
	// Draw the section header for the first item in each section
	return (childIndex == 0) \|\|
	(items.get(pos - 1).viewType == AllAppsGridAdapter.VIEW_TYPE_SECTION_BREAK);
	}
	}

	private final Launcher mLauncher;
	private final LayoutInflater mLayoutInflater;
	private final AlphabeticalAppsList mApps;
	private final GridLayoutManager mGridLayoutMgr;
	private final GridSpanSizer mGridSizer;
	private final GridItemDecoration mItemDecoration;
	private final View.OnClickListener mIconClickListener;
	private final View.OnLongClickListener mIconLongClickListener;

	private final Rect mBackgroundPadding = new Rect();
	private final boolean mIsRtl;

	// Section drawing
	private final int mSectionNamesMargin;
	private final int mSectionHeaderOffset;
	private final Paint mSectionTextPaint;

	private int mAppsPerRow;

	private BindViewCallback mBindViewCallback;
	private AllAppsSearchBarController mSearchController;
	private OnFocusChangeListener mIconFocusListener;

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

	public AllAppsGridAdapter(Launcher launcher, AlphabeticalAppsList apps, View.OnClickListener
	iconClickListener, View.OnLongClickListener iconLongClickListener) {
	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);
	mItemDecoration = new GridItemDecoration();
	mLayoutInflater = LayoutInflater.from(launcher);
	mIconClickListener = iconClickListener;
	mIconLongClickListener = iconLongClickListener;
	mSectionNamesMargin = res.getDimensionPixelSize(R.dimen.all_apps_grid_view_start_margin);
	mSectionHeaderOffset = res.getDimensionPixelSize(R.dimen.all_apps_grid_section_y_offset);
	mIsRtl = Utilities.isRtl(res);

	mSectionTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
	mSectionTextPaint.setTextSize(res.getDimensionPixelSize(
	R.dimen.all_apps_grid_section_text_size));
	mSectionTextPaint.setColor(Utilities.getColorAccent(launcher));
	}

	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 isPredictionIconViewType(int viewType) {
	return isViewType(viewType, VIEW_TYPE_PREDICTION_ICON);
	}

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

	/**
	* Sets the number of apps per row.
	*/
	public void setNumAppsPerRow(int appsPerRow) {
	mAppsPerRow = appsPerRow;
	mGridLayoutMgr.setSpanCount(appsPerRow);
	}

	public void setSearchController(AllAppsSearchBarController searchController) {
	mSearchController = searchController;
	}

	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 = mSearchController.createMarketSearchIntent(query);
	}

	/**
	* Sets the callback for when views are bound.
	*/
	public void setBindViewCallback(BindViewCallback cb) {
	mBindViewCallback = cb;
	}

	/**
	* Notifies the adapter of the background padding so that it can draw things correctly in the
	* item decorator.
	*/
	public void updateBackgroundPadding(Rect padding) {
	mBackgroundPadding.set(padding);
	}

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

	/**
	* Returns the item decoration for the recycler view.
	*/
	public RecyclerView.ItemDecoration getItemDecoration() {
	// We don't draw any headers when we are uncomfortably dense
	return mItemDecoration;
	}

	@Override
	public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	switch (viewType) {
	case VIEW_TYPE_SECTION_BREAK:
	return new ViewHolder(new View(parent.getContext()));
	case VIEW_TYPE_ICON:
	/* falls through */
	case VIEW_TYPE_PREDICTION_ICON: {
	BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate(
	R.layout.all_apps_icon, parent, false);
	icon.setOnClickListener(mIconClickListener);
	icon.setOnLongClickListener(mIconLongClickListener);
	icon.setLongPressTimeout(ViewConfiguration.get(parent.getContext())
	.getLongPressTimeout());
	icon.setOnFocusChangeListener(mIconFocusListener);
	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(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	mLauncher.startActivitySafely(v, mMarketSearchIntent, null);
	}
	});
	return new ViewHolder(searchMarketView);
	case VIEW_TYPE_SEARCH_DIVIDER:
	return new ViewHolder(mLayoutInflater.inflate(
	R.layout.all_apps_search_divider, parent, false));
	case VIEW_TYPE_PREDICTION_DIVIDER:
	/* falls through */
	case VIEW_TYPE_SEARCH_MARKET_DIVIDER:
	return new ViewHolder(mLayoutInflater.inflate(
	R.layout.all_apps_divider, parent, false));
	default:
	throw new RuntimeException("Unexpected view type");
	}
	}

	@Override
	public void onBindViewHolder(ViewHolder holder, int position) {
	switch (holder.getItemViewType()) {
	case VIEW_TYPE_ICON: {
	AppInfo info = mApps.getAdapterItems().get(position).appInfo;
	BubbleTextView icon = (BubbleTextView) holder.mContent;
	icon.applyFromApplicationInfo(info);
	if (DeepShortcutManager.supportsShortcuts(info)) {
	// TODO: only add this listener if the item has shortcuts associated with it.
	icon.setOnTouchListener(new ShortcutsContainerListener(icon));
	}
	icon.setAccessibilityDelegate(mLauncher.getAccessibilityDelegate());
	break;
	}
	case VIEW_TYPE_PREDICTION_ICON: {
	AppInfo info = mApps.getAdapterItems().get(position).appInfo;
	BubbleTextView icon = (BubbleTextView) holder.mContent;
	icon.applyFromApplicationInfo(info);
	if (DeepShortcutManager.supportsShortcuts(info)) {
	// TODO: only add this listener if the item has shortcuts associated with it.
	icon.setOnTouchListener(new ShortcutsContainerListener(icon));
	}
	icon.setAccessibilityDelegate(mLauncher.getAccessibilityDelegate());
	break;
	}
	case VIEW_TYPE_EMPTY_SEARCH:
	TextView emptyViewText = (TextView) holder.mContent;
	emptyViewText.setText(mEmptySearchMessage);
	emptyViewText.setGravity(mApps.hasNoFilteredResults() ? Gravity.CENTER :
	Gravity.START \| Gravity.CENTER_VERTICAL);
	break;
	case VIEW_TYPE_SEARCH_MARKET:
	TextView searchView = (TextView) holder.mContent;
	if (mMarketSearchIntent != null) {
	searchView.setVisibility(View.VISIBLE);
	searchView.setGravity(mApps.hasNoFilteredResults() ? Gravity.CENTER :
	Gravity.START \| Gravity.CENTER_VERTICAL);
	} else {
	searchView.setVisibility(View.GONE);
	}
	break;
	}
	if (mBindViewCallback != null) {
	mBindViewCallback.onBindView(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) {
	AlphabeticalAppsList.AdapterItem item = mApps.getAdapterItems().get(position);
	return item.viewType;
	}
	}