packages/DocumentsUI/src/com/android/documentsui/RootsFragment.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.documentsui;

 import static com.android.documentsui.Shared.DEBUG;

 import android.app.Activity;
 import android.app.Fragment;
 import android.app.FragmentManager;
 import android.app.FragmentTransaction;
 import android.app.LoaderManager.LoaderCallbacks;
 import android.content.Context;
 import android.content.Intent;
 import android.content.Loader;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.support.annotation.Nullable;
 import android.text.TextUtils;
 import android.text.format.Formatter;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.AdapterView.OnItemLongClickListener;
 import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.TextView;

 import com.android.documentsui.model.RootInfo;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Objects;

 /**
  * Display list of known storage backend roots.
  */
 public class RootsFragment extends Fragment {

     private static final String TAG = "RootsFragment";
     private static final String EXTRA_INCLUDE_APPS = "includeApps";

     private ListView mList;
     private RootsAdapter mAdapter;
     private LoaderCallbacks<Collection<RootInfo>> mCallbacks;


     public static void show(FragmentManager fm, Intent includeApps) {
         final Bundle args = new Bundle();
         args.putParcelable(EXTRA_INCLUDE_APPS, includeApps);

         final RootsFragment fragment = new RootsFragment();
         fragment.setArguments(args);

         final FragmentTransaction ft = fm.beginTransaction();
         ft.replace(R.id.container_roots, fragment);
         ft.commitAllowingStateLoss();
     }

     public static RootsFragment get(FragmentManager fm) {
         return (RootsFragment) fm.findFragmentById(R.id.container_roots);
     }

     @Override
     public View onCreateView(
             LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

         final View view = inflater.inflate(R.layout.fragment_roots, container, false);
         mList = (ListView) view.findViewById(R.id.roots_list);
         mList.setOnItemClickListener(mItemListener);
         mList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
         return view;
     }

     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);

         final Context context = getActivity();
         final RootsCache roots = DocumentsApplication.getRootsCache(context);
         final State state = ((BaseActivity) context).getDisplayState();

         mCallbacks = new LoaderCallbacks<Collection<RootInfo>>() {
             @Override
             public Loader<Collection<RootInfo>> onCreateLoader(int id, Bundle args) {
                 return new RootsLoader(context, roots, state);
             }

             @Override
             public void onLoadFinished(
                     Loader<Collection<RootInfo>> loader, Collection<RootInfo> result) {
                 if (!isAdded()) {
                     return;
                 }

                 Intent handlerAppIntent = getArguments().getParcelable(EXTRA_INCLUDE_APPS);

                 mAdapter = new RootsAdapter(context, result, handlerAppIntent, state);
                 mList.setAdapter(mAdapter);

                 onCurrentRootChanged();
             }

             @Override
             public void onLoaderReset(Loader<Collection<RootInfo>> loader) {
                 mAdapter = null;
                 mList.setAdapter(null);
             }
         };
     }

     @Override
     public void onResume() {
         super.onResume();
         onDisplayStateChanged();
     }

     public void onDisplayStateChanged() {
         final Context context = getActivity();
         final State state = ((BaseActivity) context).getDisplayState();

         if (state.action == State.ACTION_GET_CONTENT) {
             mList.setOnItemLongClickListener(mItemLongClickListener);
         } else {
             mList.setOnItemLongClickListener(null);
             mList.setLongClickable(false);
         }

         getLoaderManager().restartLoader(2, null, mCallbacks);
     }

     public void onCurrentRootChanged() {
         if (mAdapter == null) {
             return;
         }

         final RootInfo root = ((BaseActivity) getActivity()).getCurrentRoot();
         for (int i = 0; i < mAdapter.getCount(); i++) {
             final Object item = mAdapter.getItem(i);
             if (item instanceof RootItem) {
                 final RootInfo testRoot = ((RootItem) item).root;
                 if (Objects.equals(testRoot, root)) {
                     mList.setItemChecked(i, true);
                     mList.setSelection(i);
                     return;
                 }
             }
         }
     }

     /**
      * Attempts to shift focus back to the navigation drawer.
      */
     public void requestFocus() {
         mList.requestFocus();
     }

     private void showAppDetails(ResolveInfo ri) {
         final Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
         intent.setData(Uri.fromParts("package", ri.activityInfo.packageName, null));
         intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
         startActivity(intent);
     }

     private OnItemClickListener mItemListener = new OnItemClickListener() {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
             Item item = mAdapter.getItem(position);
             if (item instanceof RootItem) {
                 BaseActivity activity = BaseActivity.get(RootsFragment.this);
                 RootInfo newRoot = ((RootItem) item).root;
                 Metrics.logRootVisited(getActivity(), newRoot);
                 activity.onRootPicked(newRoot);
             } else if (item instanceof AppItem) {
                 DocumentsActivity activity = DocumentsActivity.get(RootsFragment.this);
                 ResolveInfo info = ((AppItem) item).info;
                 Metrics.logAppVisited(getActivity(), info);
                 activity.onAppPicked(info);
             } else if (item instanceof SpacerItem) {
                 if (DEBUG) Log.d(TAG, "Ignoring click on spacer item.");
             } else {
                 throw new IllegalStateException("Unknown root: " + item);
             }
         }
     };

     private OnItemLongClickListener mItemLongClickListener = new OnItemLongClickListener() {
         @Override
         public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
             final Item item = mAdapter.getItem(position);
             if (item instanceof AppItem) {
                 showAppDetails(((AppItem) item).info);
                 return true;
             } else {
                 return false;
             }
         }
     };

     private static abstract class Item {
         private final int mLayoutId;

         public Item(int layoutId) {
             mLayoutId = layoutId;
         }

         public View getView(View convertView, ViewGroup parent) {
             // Disable recycling views because 1) it's very unlikely a view can be recycled here;
             // 2) there is no easy way for us to know with which layout id the convertView was
             // inflated; and 3) simplicity is much appreciated at this time.
             convertView = LayoutInflater.from(parent.getContext())
                         .inflate(mLayoutId, parent, false);
             bindView(convertView);
             return convertView;
         }

         public abstract void bindView(View convertView);
     }

     private static class RootItem extends Item {
         public final RootInfo root;

         public RootItem(RootInfo root) {
             super(R.layout.item_root);
             this.root = root;
         }

         @Override
         public void bindView(View convertView) {
             final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
             final TextView title = (TextView) convertView.findViewById(android.R.id.title);
             final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);

             final Context context = convertView.getContext();
             icon.setImageDrawable(root.loadDrawerIcon(context));
             title.setText(root.title);

             // Show available space if no summary
             String summaryText = root.summary;
             if (TextUtils.isEmpty(summaryText) && root.availableBytes >= 0) {
                 summaryText = context.getString(R.string.root_available_bytes,
                         Formatter.formatFileSize(context, root.availableBytes));
             }

             summary.setText(summaryText);
             summary.setVisibility(TextUtils.isEmpty(summaryText) ? View.GONE : View.VISIBLE);
         }
     }

     private static class SpacerItem extends Item {
         public SpacerItem() {
             super(R.layout.item_root_spacer);
         }

         @Override
         public void bindView(View convertView) {
             // Nothing to bind
         }
     }

     private static class AppItem extends Item {
         public final ResolveInfo info;

         public AppItem(ResolveInfo info) {
             super(R.layout.item_root);
             this.info = info;
         }

         @Override
         public void bindView(View convertView) {
             final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
             final TextView title = (TextView) convertView.findViewById(android.R.id.title);
             final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);

             final PackageManager pm = convertView.getContext().getPackageManager();
             icon.setImageDrawable(info.loadIcon(pm));
             title.setText(info.loadLabel(pm));

             // TODO: match existing summary behavior from disambig dialog
             summary.setVisibility(View.GONE);
         }
     }

     private static class RootsAdapter extends ArrayAdapter<Item> {

         /**
          * @param handlerAppIntent When not null, apps capable of handling the original
          *     intent will be included in list of roots (in special section at bottom).
          */
         public RootsAdapter(Context context, Collection<RootInfo> roots,
                 @Nullable Intent handlerAppIntent, State state) {
             super(context, 0);

             final List<RootItem> libraries = new ArrayList<>();
             final List<RootItem> others = new ArrayList<>();

             for (final RootInfo root : roots) {
                 final RootItem item = new RootItem(root);

                 if (root.isHome() &&
                         !Shared.shouldShowDocumentsRoot(context, ((Activity) context).getIntent())) {
                     continue;
                 } else if (root.isLibrary()) {
                     if (DEBUG) Log.d(TAG, "Adding " + root + " as library.");
                     libraries.add(item);
                 } else {
                     if (DEBUG) Log.d(TAG, "Adding " + root + " as non-library.");
                     others.add(item);
                 }
             }

             final RootComparator comp = new RootComparator();
             Collections.sort(libraries, comp);
             Collections.sort(others, comp);

             addAll(libraries);
             // Only add the spacer if it is actually separating something.
             if (!libraries.isEmpty() && !others.isEmpty()) {
                 add(new SpacerItem());
             }
             addAll(others);

             // Include apps that can handle this intent too.
             if (handlerAppIntent != null) {
                 includeHandlerApps(context, handlerAppIntent);
             }
         }

         /**
          * Adds apps capable of handling the original intent will be included
          * in list of roots (in special section at bottom).
          */
         private void includeHandlerApps(Context context, Intent handlerAppIntent) {
             final PackageManager pm = context.getPackageManager();
             final List<ResolveInfo> infos = pm.queryIntentActivities(
                     handlerAppIntent, PackageManager.MATCH_DEFAULT_ONLY);

             final List<AppItem> apps = new ArrayList<>();

             // Omit ourselves from the list
             for (ResolveInfo info : infos) {
                 if (!context.getPackageName().equals(info.activityInfo.packageName)) {
                     apps.add(new AppItem(info));
                 }
             }

             if (apps.size() > 0) {
                 add(new SpacerItem());
                 addAll(apps);
             }
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             final Item item = getItem(position);
             return item.getView(convertView, parent);
         }

         @Override
         public boolean areAllItemsEnabled() {
             return false;
         }

         @Override
         public boolean isEnabled(int position) {
             return getItemViewType(position) != 1;
         }

         @Override
         public int getItemViewType(int position) {
             final Item item = getItem(position);
             if (item instanceof RootItem || item instanceof AppItem) {
                 return 0;
             } else {
                 return 1;
             }
         }

         @Override
         public int getViewTypeCount() {
             return 2;
         }
     }

     public static class RootComparator implements Comparator<RootItem> {
         @Override
         public int compare(RootItem lhs, RootItem rhs) {
             return lhs.root.compareTo(rhs.root);
         }
     }
 }
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.documentsui;

	import static com.android.documentsui.Shared.DEBUG;

	import android.app.Activity;
	import android.app.Fragment;
	import android.app.FragmentManager;
	import android.app.FragmentTransaction;
	import android.app.LoaderManager.LoaderCallbacks;
	import android.content.Context;
	import android.content.Intent;
	import android.content.Loader;
	import android.content.pm.PackageManager;
	import android.content.pm.ResolveInfo;
	import android.net.Uri;
	import android.os.Bundle;
	import android.provider.Settings;
	import android.support.annotation.Nullable;
	import android.text.TextUtils;
	import android.text.format.Formatter;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.AdapterView.OnItemLongClickListener;
	import android.widget.ArrayAdapter;
	import android.widget.ImageView;
	import android.widget.ListView;
	import android.widget.TextView;

	import com.android.documentsui.model.RootInfo;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.List;
	import java.util.Objects;

	/**
	* Display list of known storage backend roots.
	*/
	public class RootsFragment extends Fragment {

	private static final String TAG = "RootsFragment";
	private static final String EXTRA_INCLUDE_APPS = "includeApps";

	private ListView mList;
	private RootsAdapter mAdapter;
	private LoaderCallbacks<Collection<RootInfo>> mCallbacks;


	public static void show(FragmentManager fm, Intent includeApps) {
	final Bundle args = new Bundle();
	args.putParcelable(EXTRA_INCLUDE_APPS, includeApps);

	final RootsFragment fragment = new RootsFragment();
	fragment.setArguments(args);

	final FragmentTransaction ft = fm.beginTransaction();
	ft.replace(R.id.container_roots, fragment);
	ft.commitAllowingStateLoss();
	}

	public static RootsFragment get(FragmentManager fm) {
	return (RootsFragment) fm.findFragmentById(R.id.container_roots);
	}

	@Override
	public View onCreateView(
	LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

	final View view = inflater.inflate(R.layout.fragment_roots, container, false);
	mList = (ListView) view.findViewById(R.id.roots_list);
	mList.setOnItemClickListener(mItemListener);
	mList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
	return view;
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);

	final Context context = getActivity();
	final RootsCache roots = DocumentsApplication.getRootsCache(context);
	final State state = ((BaseActivity) context).getDisplayState();

	mCallbacks = new LoaderCallbacks<Collection<RootInfo>>() {
	@Override
	public Loader<Collection<RootInfo>> onCreateLoader(int id, Bundle args) {
	return new RootsLoader(context, roots, state);
	}

	@Override
	public void onLoadFinished(
	Loader<Collection<RootInfo>> loader, Collection<RootInfo> result) {
	if (!isAdded()) {
	return;
	}

	Intent handlerAppIntent = getArguments().getParcelable(EXTRA_INCLUDE_APPS);

	mAdapter = new RootsAdapter(context, result, handlerAppIntent, state);
	mList.setAdapter(mAdapter);

	onCurrentRootChanged();
	}

	@Override
	public void onLoaderReset(Loader<Collection<RootInfo>> loader) {
	mAdapter = null;
	mList.setAdapter(null);
	}
	};
	}

	@Override
	public void onResume() {
	super.onResume();
	onDisplayStateChanged();
	}

	public void onDisplayStateChanged() {
	final Context context = getActivity();
	final State state = ((BaseActivity) context).getDisplayState();

	if (state.action == State.ACTION_GET_CONTENT) {
	mList.setOnItemLongClickListener(mItemLongClickListener);
	} else {
	mList.setOnItemLongClickListener(null);
	mList.setLongClickable(false);
	}

	getLoaderManager().restartLoader(2, null, mCallbacks);
	}

	public void onCurrentRootChanged() {
	if (mAdapter == null) {
	return;
	}

	final RootInfo root = ((BaseActivity) getActivity()).getCurrentRoot();
	for (int i = 0; i < mAdapter.getCount(); i++) {
	final Object item = mAdapter.getItem(i);
	if (item instanceof RootItem) {
	final RootInfo testRoot = ((RootItem) item).root;
	if (Objects.equals(testRoot, root)) {
	mList.setItemChecked(i, true);
	mList.setSelection(i);
	return;
	}
	}
	}
	}

	/**
	* Attempts to shift focus back to the navigation drawer.
	*/
	public void requestFocus() {
	mList.requestFocus();
	}

	private void showAppDetails(ResolveInfo ri) {
	final Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
	intent.setData(Uri.fromParts("package", ri.activityInfo.packageName, null));
	intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
	startActivity(intent);
	}

	private OnItemClickListener mItemListener = new OnItemClickListener() {
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
	Item item = mAdapter.getItem(position);
	if (item instanceof RootItem) {
	BaseActivity activity = BaseActivity.get(RootsFragment.this);
	RootInfo newRoot = ((RootItem) item).root;
	Metrics.logRootVisited(getActivity(), newRoot);
	activity.onRootPicked(newRoot);
	} else if (item instanceof AppItem) {
	DocumentsActivity activity = DocumentsActivity.get(RootsFragment.this);
	ResolveInfo info = ((AppItem) item).info;
	Metrics.logAppVisited(getActivity(), info);
	activity.onAppPicked(info);
	} else if (item instanceof SpacerItem) {
	if (DEBUG) Log.d(TAG, "Ignoring click on spacer item.");
	} else {
	throw new IllegalStateException("Unknown root: " + item);
	}
	}
	};

	private OnItemLongClickListener mItemLongClickListener = new OnItemLongClickListener() {
	@Override
	public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
	final Item item = mAdapter.getItem(position);
	if (item instanceof AppItem) {
	showAppDetails(((AppItem) item).info);
	return true;
	} else {
	return false;
	}
	}
	};

	private static abstract class Item {
	private final int mLayoutId;

	public Item(int layoutId) {
	mLayoutId = layoutId;
	}

	public View getView(View convertView, ViewGroup parent) {
	// Disable recycling views because 1) it's very unlikely a view can be recycled here;
	// 2) there is no easy way for us to know with which layout id the convertView was
	// inflated; and 3) simplicity is much appreciated at this time.
	convertView = LayoutInflater.from(parent.getContext())
	.inflate(mLayoutId, parent, false);
	bindView(convertView);
	return convertView;
	}

	public abstract void bindView(View convertView);
	}

	private static class RootItem extends Item {
	public final RootInfo root;

	public RootItem(RootInfo root) {
	super(R.layout.item_root);
	this.root = root;
	}

	@Override
	public void bindView(View convertView) {
	final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
	final TextView title = (TextView) convertView.findViewById(android.R.id.title);
	final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);

	final Context context = convertView.getContext();
	icon.setImageDrawable(root.loadDrawerIcon(context));
	title.setText(root.title);

	// Show available space if no summary
	String summaryText = root.summary;
	if (TextUtils.isEmpty(summaryText) && root.availableBytes >= 0) {
	summaryText = context.getString(R.string.root_available_bytes,
	Formatter.formatFileSize(context, root.availableBytes));
	}

	summary.setText(summaryText);
	summary.setVisibility(TextUtils.isEmpty(summaryText) ? View.GONE : View.VISIBLE);
	}
	}

	private static class SpacerItem extends Item {
	public SpacerItem() {
	super(R.layout.item_root_spacer);
	}

	@Override
	public void bindView(View convertView) {
	// Nothing to bind
	}
	}

	private static class AppItem extends Item {
	public final ResolveInfo info;

	public AppItem(ResolveInfo info) {
	super(R.layout.item_root);
	this.info = info;
	}

	@Override
	public void bindView(View convertView) {
	final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
	final TextView title = (TextView) convertView.findViewById(android.R.id.title);
	final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);

	final PackageManager pm = convertView.getContext().getPackageManager();
	icon.setImageDrawable(info.loadIcon(pm));
	title.setText(info.loadLabel(pm));

	// TODO: match existing summary behavior from disambig dialog
	summary.setVisibility(View.GONE);
	}
	}

	private static class RootsAdapter extends ArrayAdapter<Item> {

	/**
	* @param handlerAppIntent When not null, apps capable of handling the original
	* intent will be included in list of roots (in special section at bottom).
	*/
	public RootsAdapter(Context context, Collection<RootInfo> roots,
	@Nullable Intent handlerAppIntent, State state) {
	super(context, 0);

	final List<RootItem> libraries = new ArrayList<>();
	final List<RootItem> others = new ArrayList<>();

	for (final RootInfo root : roots) {
	final RootItem item = new RootItem(root);

	if (root.isHome() &&
	!Shared.shouldShowDocumentsRoot(context, ((Activity) context).getIntent())) {
	continue;
	} else if (root.isLibrary()) {
	if (DEBUG) Log.d(TAG, "Adding " + root + " as library.");
	libraries.add(item);
	} else {
	if (DEBUG) Log.d(TAG, "Adding " + root + " as non-library.");
	others.add(item);
	}
	}

	final RootComparator comp = new RootComparator();
	Collections.sort(libraries, comp);
	Collections.sort(others, comp);

	addAll(libraries);
	// Only add the spacer if it is actually separating something.
	if (!libraries.isEmpty() && !others.isEmpty()) {
	add(new SpacerItem());
	}
	addAll(others);

	// Include apps that can handle this intent too.
	if (handlerAppIntent != null) {
	includeHandlerApps(context, handlerAppIntent);
	}
	}

	/**
	* Adds apps capable of handling the original intent will be included
	* in list of roots (in special section at bottom).
	*/
	private void includeHandlerApps(Context context, Intent handlerAppIntent) {
	final PackageManager pm = context.getPackageManager();
	final List<ResolveInfo> infos = pm.queryIntentActivities(
	handlerAppIntent, PackageManager.MATCH_DEFAULT_ONLY);

	final List<AppItem> apps = new ArrayList<>();

	// Omit ourselves from the list
	for (ResolveInfo info : infos) {
	if (!context.getPackageName().equals(info.activityInfo.packageName)) {
	apps.add(new AppItem(info));
	}
	}

	if (apps.size() > 0) {
	add(new SpacerItem());
	addAll(apps);
	}
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	final Item item = getItem(position);
	return item.getView(convertView, parent);
	}

	@Override
	public boolean areAllItemsEnabled() {
	return false;
	}

	@Override
	public boolean isEnabled(int position) {
	return getItemViewType(position) != 1;
	}

	@Override
	public int getItemViewType(int position) {
	final Item item = getItem(position);
	if (item instanceof RootItem \|\| item instanceof AppItem) {
	return 0;
	} else {
	return 1;
	}
	}

	@Override
	public int getViewTypeCount() {
	return 2;
	}
	}

	public static class RootComparator implements Comparator<RootItem> {
	@Override
	public int compare(RootItem lhs, RootItem rhs) {
	return lhs.root.compareTo(rhs.root);
	}
	}
	}