src/com/android/launcher3/allapps/AllAppsGridAdapter.java - LeafOS-Project/android_packages_apps_Launcher3 - Gitiles

 /*
  * 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.support.animation.DynamicAnimation;
 import android.support.animation.SpringAnimation;
 import android.support.v4.view.accessibility.AccessibilityEventCompat;
 import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
 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.allapps.AlphabeticalAppsList.AdapterItem;
 import com.android.launcher3.anim.SpringAnimationHandler;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.discovery.AppDiscoveryAppInfo;
 import com.android.launcher3.discovery.AppDiscoveryItemView;
 import com.android.launcher3.util.PackageManagerHelper;

 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;
     // 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;
     // The message to continue to a market search when there are no filtered results
     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 that separates prediction icons from the app list
     public static final int VIEW_TYPE_PREDICTION_DIVIDER = 1 << 6;
     public static final int VIEW_TYPE_APPS_LOADING_DIVIDER = 1 << 7;
     public static final int VIEW_TYPE_DISCOVERY_ITEM = 1 << 8;

     // Common view type masks
     public static final int VIEW_TYPE_MASK_DIVIDER = VIEW_TYPE_SEARCH_MARKET_DIVIDER
             | VIEW_TYPE_PREDICTION_DIVIDER;
     public static final int VIEW_TYPE_MASK_ICON = VIEW_TYPE_ICON
             | VIEW_TYPE_PREDICTION_ICON;
     public static final int VIEW_TYPE_MASK_CONTENT = VIEW_TYPE_MASK_ICON
             | VIEW_TYPE_DISCOVERY_ITEM;
     public static final int VIEW_TYPE_MASK_HAS_SPRINGS = VIEW_TYPE_MASK_ICON
             | VIEW_TYPE_PREDICTION_DIVIDER;


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

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

         public ViewHolder(View v) {
             super(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());
             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_CONTENT)) {
                     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) {
             if (isIconViewType(mApps.getAdapterItems().get(position).viewType)) {
                 return 1;
             } else {
                     // Section breaks span the full width
                     return mAppsPerRow;
             }
         }
     }

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

     private int mAppsPerRow;

     private BindViewCallback mBindViewCallback;
     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;

     private SpringAnimationHandler<ViewHolder> mSpringAnimationHandler;

     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);
         mLayoutInflater = LayoutInflater.from(launcher);
         mIconClickListener = iconClickListener;
         mIconLongClickListener = iconLongClickListener;
         if (FeatureFlags.LAUNCHER3_PHYSICS) {
             mSpringAnimationHandler = new SpringAnimationHandler<>(
                     SpringAnimationHandler.Y_DIRECTION, new AllAppsSpringAnimationFactory());
         }
     }

     public SpringAnimationHandler getSpringAnimationHandler() {
         return mSpringAnimationHandler;
     }

     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;
     }

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

     public int getNumAppsPerRow() {
         return mAppsPerRow;
     }

     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);
     }

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

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

     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         switch (viewType) {
             case VIEW_TYPE_ICON:
             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.getLongPressTimeout());
                 icon.setOnFocusChangeListener(mIconFocusListener);

                 // 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_DISCOVERY_ITEM:
                 AppDiscoveryItemView appDiscoveryItemView = (AppDiscoveryItemView) mLayoutInflater
                         .inflate(R.layout.all_apps_discovery_item, parent, false);
                 appDiscoveryItemView.init(mIconClickListener, mLauncher.getAccessibilityDelegate(),
                         mIconLongClickListener);
                 return new ViewHolder(appDiscoveryItemView);
             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_APPS_LOADING_DIVIDER:
                 View loadingDividerView = mLayoutInflater.inflate(
                         R.layout.all_apps_discovery_loading_divider, parent, false);
                 return new ViewHolder(loadingDividerView);
             case VIEW_TYPE_PREDICTION_DIVIDER:
             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:
             case VIEW_TYPE_PREDICTION_ICON:
                 AppInfo info = mApps.getAdapterItems().get(position).appInfo;
                 BubbleTextView icon = (BubbleTextView) holder.itemView;
                 icon.applyFromApplicationInfo(info);
                 break;
             case VIEW_TYPE_DISCOVERY_ITEM:
                 AppDiscoveryAppInfo appDiscoveryAppInfo = (AppDiscoveryAppInfo)
                         mApps.getAdapterItems().get(position).appInfo;
                 AppDiscoveryItemView view = (AppDiscoveryItemView) holder.itemView;
                 view.apply(appDiscoveryAppInfo);
                 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_APPS_LOADING_DIVIDER:
                 int visLoading = mApps.isAppDiscoveryRunning() ? View.VISIBLE : View.GONE;
                 int visLoaded = !mApps.isAppDiscoveryRunning() ? View.VISIBLE : View.GONE;
                 holder.itemView.findViewById(R.id.loadingProgressBar).setVisibility(visLoading);
                 holder.itemView.findViewById(R.id.loadedDivider).setVisibility(visLoaded);
                 break;
             case VIEW_TYPE_SEARCH_MARKET_DIVIDER:
                 // nothing to do
                 break;
         }
         if (mBindViewCallback != null) {
             mBindViewCallback.onBindView(holder);
         }
     }

     @Override
     public void onViewAttachedToWindow(ViewHolder holder) {
         int type = holder.getItemViewType();
         if (FeatureFlags.LAUNCHER3_PHYSICS && isViewType(type, VIEW_TYPE_MASK_HAS_SPRINGS)) {
             mSpringAnimationHandler.add(holder.itemView, holder);
         }
     }

     @Override
     public void onViewDetachedFromWindow(ViewHolder holder) {
         int type = holder.getItemViewType();
         if (FeatureFlags.LAUNCHER3_PHYSICS && isViewType(type, VIEW_TYPE_MASK_HAS_SPRINGS)) {
             mSpringAnimationHandler.remove(holder.itemView);
         }
     }

     @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;
     }

     /**
      * Helper class to set the SpringAnimation values for an item in the adapter.
      */
     private class AllAppsSpringAnimationFactory
             implements SpringAnimationHandler.AnimationFactory<ViewHolder> {
         private static final float DEFAULT_MAX_VALUE_PX = 100;
         private static final float DEFAULT_MIN_VALUE_PX = -DEFAULT_MAX_VALUE_PX;

         // Damping ratio range is [0, 1]
         private static final float SPRING_DAMPING_RATIO = 0.55f;

         // Stiffness is a non-negative number.
         private static final float MIN_SPRING_STIFFNESS = 580f;
         private static final float MAX_SPRING_STIFFNESS = 900f;

         // The amount by which each adjacent rows' stiffness will differ.
         private static final float ROW_STIFFNESS_COEFFICIENT = 50f;

         @Override
         public SpringAnimation initialize(ViewHolder vh) {
             return SpringAnimationHandler.forView(vh.itemView, DynamicAnimation.TRANSLATION_Y, 0);
         }

         /**
          * @param spring A new or recycled SpringAnimation.
          * @param vh The ViewHolder that {@param spring} is related to.
          */
         @Override
         public void update(SpringAnimation spring, ViewHolder vh) {
             int numPredictedApps = Math.min(mAppsPerRow, mApps.getPredictedApps().size());
             int appPosition = getAppPosition(vh.getAdapterPosition(), numPredictedApps,
                     mAppsPerRow);

             int col = appPosition % mAppsPerRow;
             int row = appPosition / mAppsPerRow;

             int numTotalRows = mApps.getNumAppRows() - 1; // zero-based count
             if (row > (numTotalRows / 2)) {
                 // Mirror the rows so that the top row acts the same as the bottom row.
                 row = Math.abs(numTotalRows - row);
             }

             calculateSpringValues(spring, row, col);
         }

         @Override
         public void setDefaultValues(SpringAnimation spring) {
             calculateSpringValues(spring, 0, mAppsPerRow / 2);
         }

         /**
          * We manipulate the stiffness, min, and max values based on the items distance to the
          * first row and the items distance to the center column to create the ^-shaped motion
          * effect.
          */
         private void calculateSpringValues(SpringAnimation spring, int row, int col) {
             float rowFactor = (1 + row) * 0.5f;
             float colFactor = getColumnFactor(col, mAppsPerRow);

             float minValue = DEFAULT_MIN_VALUE_PX * (rowFactor + colFactor);
             float maxValue = DEFAULT_MAX_VALUE_PX * (rowFactor + colFactor);

             float stiffness = Utilities.boundToRange(
                     MAX_SPRING_STIFFNESS - (row * ROW_STIFFNESS_COEFFICIENT),
                     MIN_SPRING_STIFFNESS,
                     MAX_SPRING_STIFFNESS);

             spring.setMinValue(minValue)
                     .setMaxValue(maxValue)
                     .getSpring()
                     .setStiffness(stiffness)
                     .setDampingRatio(SPRING_DAMPING_RATIO);
         }

         /**
          * @return The app position is the position of the app in the Adapter if we ignored all
          * other view types.
          *
          * The first app is at position 0, and the first app each following row is at a
          * position that is a multiple of {@param appsPerRow}.
          *
          * ie. If there are 5 apps per row, and there are two rows of apps:
          *     0 1 2 3 4
          *     5 6 7 8 9
          */
         private int getAppPosition(int position, int numPredictedApps, int appsPerRow) {
             if (position < numPredictedApps) {
                 // Predicted apps are first in the adapter.
                 return position;
             }

             // There is at most 1 divider view between the predicted apps and the alphabetical apps.
             int numDividerViews = numPredictedApps == 0 ? 0 : 1;

             // This offset takes into consideration an incomplete row of predicted apps.
             int numPredictedAppsOffset = appsPerRow - numPredictedApps;
             return position + numPredictedAppsOffset - numDividerViews;
         }

         /**
          * Increase the column factor as the distance increases between the column and the center
          * column(s).
          */
         private float getColumnFactor(int col, int numCols) {
             float centerColumn = numCols / 2;
             int distanceToCenter = (int) Math.abs(col - centerColumn);

             boolean evenNumberOfColumns = numCols % 2 == 0;
             if (evenNumberOfColumns && col < centerColumn) {
                 distanceToCenter -= 1;
             }

             float factor = 0;
             while (distanceToCenter > 0) {
                 if (distanceToCenter == 1) {
                     factor += 0.2f;
                 } else {
                     factor += 0.1f;
                 }
                 --distanceToCenter;
             }

             return factor;
         }
     }
 }
	/*
	* 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.support.animation.DynamicAnimation;
	import android.support.animation.SpringAnimation;
	import android.support.v4.view.accessibility.AccessibilityEventCompat;
	import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
	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.allapps.AlphabeticalAppsList.AdapterItem;
	import com.android.launcher3.anim.SpringAnimationHandler;
	import com.android.launcher3.config.FeatureFlags;
	import com.android.launcher3.discovery.AppDiscoveryAppInfo;
	import com.android.launcher3.discovery.AppDiscoveryItemView;
	import com.android.launcher3.util.PackageManagerHelper;

	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;
	// 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;
	// The message to continue to a market search when there are no filtered results
	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 that separates prediction icons from the app list
	public static final int VIEW_TYPE_PREDICTION_DIVIDER = 1 << 6;
	public static final int VIEW_TYPE_APPS_LOADING_DIVIDER = 1 << 7;
	public static final int VIEW_TYPE_DISCOVERY_ITEM = 1 << 8;

	// Common view type masks
	public static final int VIEW_TYPE_MASK_DIVIDER = VIEW_TYPE_SEARCH_MARKET_DIVIDER
	\| VIEW_TYPE_PREDICTION_DIVIDER;
	public static final int VIEW_TYPE_MASK_ICON = VIEW_TYPE_ICON
	\| VIEW_TYPE_PREDICTION_ICON;
	public static final int VIEW_TYPE_MASK_CONTENT = VIEW_TYPE_MASK_ICON
	\| VIEW_TYPE_DISCOVERY_ITEM;
	public static final int VIEW_TYPE_MASK_HAS_SPRINGS = VIEW_TYPE_MASK_ICON
	\| VIEW_TYPE_PREDICTION_DIVIDER;


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

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

	public ViewHolder(View v) {
	super(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());
	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_CONTENT)) {
	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) {
	if (isIconViewType(mApps.getAdapterItems().get(position).viewType)) {
	return 1;
	} else {
	// Section breaks span the full width
	return mAppsPerRow;
	}
	}
	}

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

	private int mAppsPerRow;

	private BindViewCallback mBindViewCallback;
	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;

	private SpringAnimationHandler<ViewHolder> mSpringAnimationHandler;

	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);
	mLayoutInflater = LayoutInflater.from(launcher);
	mIconClickListener = iconClickListener;
	mIconLongClickListener = iconLongClickListener;
	if (FeatureFlags.LAUNCHER3_PHYSICS) {
	mSpringAnimationHandler = new SpringAnimationHandler<>(
	SpringAnimationHandler.Y_DIRECTION, new AllAppsSpringAnimationFactory());
	}
	}

	public SpringAnimationHandler getSpringAnimationHandler() {
	return mSpringAnimationHandler;
	}

	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;
	}

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

	public int getNumAppsPerRow() {
	return mAppsPerRow;
	}

	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);
	}

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

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

	@Override
	public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	switch (viewType) {
	case VIEW_TYPE_ICON:
	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.getLongPressTimeout());
	icon.setOnFocusChangeListener(mIconFocusListener);

	// 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_DISCOVERY_ITEM:
	AppDiscoveryItemView appDiscoveryItemView = (AppDiscoveryItemView) mLayoutInflater
	.inflate(R.layout.all_apps_discovery_item, parent, false);
	appDiscoveryItemView.init(mIconClickListener, mLauncher.getAccessibilityDelegate(),
	mIconLongClickListener);
	return new ViewHolder(appDiscoveryItemView);
	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_APPS_LOADING_DIVIDER:
	View loadingDividerView = mLayoutInflater.inflate(
	R.layout.all_apps_discovery_loading_divider, parent, false);
	return new ViewHolder(loadingDividerView);
	case VIEW_TYPE_PREDICTION_DIVIDER:
	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:
	case VIEW_TYPE_PREDICTION_ICON:
	AppInfo info = mApps.getAdapterItems().get(position).appInfo;
	BubbleTextView icon = (BubbleTextView) holder.itemView;
	icon.applyFromApplicationInfo(info);
	break;
	case VIEW_TYPE_DISCOVERY_ITEM:
	AppDiscoveryAppInfo appDiscoveryAppInfo = (AppDiscoveryAppInfo)
	mApps.getAdapterItems().get(position).appInfo;
	AppDiscoveryItemView view = (AppDiscoveryItemView) holder.itemView;
	view.apply(appDiscoveryAppInfo);
	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_APPS_LOADING_DIVIDER:
	int visLoading = mApps.isAppDiscoveryRunning() ? View.VISIBLE : View.GONE;
	int visLoaded = !mApps.isAppDiscoveryRunning() ? View.VISIBLE : View.GONE;
	holder.itemView.findViewById(R.id.loadingProgressBar).setVisibility(visLoading);
	holder.itemView.findViewById(R.id.loadedDivider).setVisibility(visLoaded);
	break;
	case VIEW_TYPE_SEARCH_MARKET_DIVIDER:
	// nothing to do
	break;
	}
	if (mBindViewCallback != null) {
	mBindViewCallback.onBindView(holder);
	}
	}

	@Override
	public void onViewAttachedToWindow(ViewHolder holder) {
	int type = holder.getItemViewType();
	if (FeatureFlags.LAUNCHER3_PHYSICS && isViewType(type, VIEW_TYPE_MASK_HAS_SPRINGS)) {
	mSpringAnimationHandler.add(holder.itemView, holder);
	}
	}

	@Override
	public void onViewDetachedFromWindow(ViewHolder holder) {
	int type = holder.getItemViewType();
	if (FeatureFlags.LAUNCHER3_PHYSICS && isViewType(type, VIEW_TYPE_MASK_HAS_SPRINGS)) {
	mSpringAnimationHandler.remove(holder.itemView);
	}
	}

	@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;
	}

	/**
	* Helper class to set the SpringAnimation values for an item in the adapter.
	*/
	private class AllAppsSpringAnimationFactory
	implements SpringAnimationHandler.AnimationFactory<ViewHolder> {
	private static final float DEFAULT_MAX_VALUE_PX = 100;
	private static final float DEFAULT_MIN_VALUE_PX = -DEFAULT_MAX_VALUE_PX;

	// Damping ratio range is [0, 1]
	private static final float SPRING_DAMPING_RATIO = 0.55f;

	// Stiffness is a non-negative number.
	private static final float MIN_SPRING_STIFFNESS = 580f;
	private static final float MAX_SPRING_STIFFNESS = 900f;

	// The amount by which each adjacent rows' stiffness will differ.
	private static final float ROW_STIFFNESS_COEFFICIENT = 50f;

	@Override
	public SpringAnimation initialize(ViewHolder vh) {
	return SpringAnimationHandler.forView(vh.itemView, DynamicAnimation.TRANSLATION_Y, 0);
	}

	/**
	* @param spring A new or recycled SpringAnimation.
	* @param vh The ViewHolder that {@param spring} is related to.
	*/
	@Override
	public void update(SpringAnimation spring, ViewHolder vh) {
	int numPredictedApps = Math.min(mAppsPerRow, mApps.getPredictedApps().size());
	int appPosition = getAppPosition(vh.getAdapterPosition(), numPredictedApps,
	mAppsPerRow);

	int col = appPosition % mAppsPerRow;
	int row = appPosition / mAppsPerRow;

	int numTotalRows = mApps.getNumAppRows() - 1; // zero-based count
	if (row > (numTotalRows / 2)) {
	// Mirror the rows so that the top row acts the same as the bottom row.
	row = Math.abs(numTotalRows - row);
	}

	calculateSpringValues(spring, row, col);
	}

	@Override
	public void setDefaultValues(SpringAnimation spring) {
	calculateSpringValues(spring, 0, mAppsPerRow / 2);
	}

	/**
	* We manipulate the stiffness, min, and max values based on the items distance to the
	* first row and the items distance to the center column to create the ^-shaped motion
	* effect.
	*/
	private void calculateSpringValues(SpringAnimation spring, int row, int col) {
	float rowFactor = (1 + row) * 0.5f;
	float colFactor = getColumnFactor(col, mAppsPerRow);

	float minValue = DEFAULT_MIN_VALUE_PX * (rowFactor + colFactor);
	float maxValue = DEFAULT_MAX_VALUE_PX * (rowFactor + colFactor);

	float stiffness = Utilities.boundToRange(
	MAX_SPRING_STIFFNESS - (row * ROW_STIFFNESS_COEFFICIENT),
	MIN_SPRING_STIFFNESS,
	MAX_SPRING_STIFFNESS);

	spring.setMinValue(minValue)
	.setMaxValue(maxValue)
	.getSpring()
	.setStiffness(stiffness)
	.setDampingRatio(SPRING_DAMPING_RATIO);
	}

	/**
	* @return The app position is the position of the app in the Adapter if we ignored all
	* other view types.
	*
	* The first app is at position 0, and the first app each following row is at a
	* position that is a multiple of {@param appsPerRow}.
	*
	* ie. If there are 5 apps per row, and there are two rows of apps:
	* 0 1 2 3 4
	* 5 6 7 8 9
	*/
	private int getAppPosition(int position, int numPredictedApps, int appsPerRow) {
	if (position < numPredictedApps) {
	// Predicted apps are first in the adapter.
	return position;
	}

	// There is at most 1 divider view between the predicted apps and the alphabetical apps.
	int numDividerViews = numPredictedApps == 0 ? 0 : 1;

	// This offset takes into consideration an incomplete row of predicted apps.
	int numPredictedAppsOffset = appsPerRow - numPredictedApps;
	return position + numPredictedAppsOffset - numDividerViews;
	}

	/**
	* Increase the column factor as the distance increases between the column and the center
	* column(s).
	*/
	private float getColumnFactor(int col, int numCols) {
	float centerColumn = numCols / 2;
	int distanceToCenter = (int) Math.abs(col - centerColumn);

	boolean evenNumberOfColumns = numCols % 2 == 0;
	if (evenNumberOfColumns && col < centerColumn) {
	distanceToCenter -= 1;
	}

	float factor = 0;
	while (distanceToCenter > 0) {
	if (distanceToCenter == 1) {
	factor += 0.2f;
	} else {
	factor += 0.1f;
	}
	--distanceToCenter;
	}

	return factor;
	}
	}
	}