src/com/android/settings/dashboard/DashboardFragment.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2016 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.settings.dashboard;

 import android.app.Activity;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.os.Bundle;
 import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceManager;
 import android.support.v7.preference.PreferenceScreen;
 import android.text.TextUtils;
 import android.util.ArrayMap;
 import android.util.ArraySet;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;

 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.search.Indexable;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.drawer.DashboardCategory;
 import com.android.settingslib.drawer.SettingsDrawerActivity;
 import com.android.settingslib.drawer.Tile;
 import com.android.settingslib.drawer.TileUtils;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;

 /**
  * Base fragment for dashboard style UI containing a list of static and dynamic setting items.
  */
 public abstract class DashboardFragment extends SettingsPreferenceFragment
         implements SettingsDrawerActivity.CategoryListener, Indexable,
         SummaryLoader.SummaryConsumer {
     private static final String TAG = "DashboardFragment";

     private final Map<Class, AbstractPreferenceController> mPreferenceControllers =
             new ArrayMap<>();
     private final Set<String> mDashboardTilePrefKeys = new ArraySet<>();

     protected ProgressiveDisclosureMixin mProgressiveDisclosureMixin;
     protected DashboardFeatureProvider mDashboardFeatureProvider;
     private DashboardTilePlaceholderPreferenceController mPlaceholderPreferenceController;
     private boolean mListeningToCategoryChange;
     private SummaryLoader mSummaryLoader;

     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
         mDashboardFeatureProvider =
                 FeatureFactory.getFactory(context).getDashboardFeatureProvider(context);
         mProgressiveDisclosureMixin = mDashboardFeatureProvider
                 .getProgressiveDisclosureMixin(context, this, getArguments());
         getLifecycle().addObserver(mProgressiveDisclosureMixin);

         List<AbstractPreferenceController> controllers = getPreferenceControllers(context);
         if (controllers == null) {
             controllers = new ArrayList<>();
         }
         mPlaceholderPreferenceController =
                 new DashboardTilePlaceholderPreferenceController(context);
         controllers.add(mPlaceholderPreferenceController);
         for (AbstractPreferenceController controller : controllers) {
             addPreferenceController(controller);
         }
     }

     @Override
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
         // Set ComparisonCallback so we get better animation when list changes.
         getPreferenceManager().setPreferenceComparisonCallback(
                 new PreferenceManager.SimplePreferenceComparisonCallback());
         // Upon rotation configuration change we need to update preference states before any
         // editing dialog is recreated (that would happen before onResume is called).
         updatePreferenceStates();
     }

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         final View view = super.onCreateView(inflater, container, savedInstanceState);
         return view;
     }

     @Override
     public void onCategoriesChanged() {
         final DashboardCategory category =
                 mDashboardFeatureProvider.getTilesForCategory(getCategoryKey());
         if (category == null) {
             return;
         }
         refreshDashboardTiles(getLogTag());
     }

     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
         super.onCreatePreferences(savedInstanceState, rootKey);
         refreshAllPreferences(getLogTag());
     }

     @Override
     public void onStart() {
         super.onStart();
         final DashboardCategory category =
                 mDashboardFeatureProvider.getTilesForCategory(getCategoryKey());
         if (category == null) {
             return;
         }
         if (mSummaryLoader != null) {
             // SummaryLoader can be null when there is no dynamic tiles.
             mSummaryLoader.setListening(true);
         }
         final Activity activity = getActivity();
         if (activity instanceof SettingsDrawerActivity) {
             mListeningToCategoryChange = true;
             ((SettingsDrawerActivity) activity).addCategoryListener(this);
         }
     }

     @Override
     public void notifySummaryChanged(Tile tile) {
         final String key = mDashboardFeatureProvider.getDashboardKeyForTile(tile);
         final Preference pref = mProgressiveDisclosureMixin.findPreference(
                 getPreferenceScreen(), key);
         if (pref == null) {
             Log.d(getLogTag(),
                     String.format("Can't find pref by key %s, skipping update summary %s/%s",
                             key, tile.title, tile.summary));
             return;
         }
         pref.setSummary(tile.summary);
     }

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

     @Override
     public boolean onPreferenceTreeClick(Preference preference) {
         Collection<AbstractPreferenceController> controllers = mPreferenceControllers.values();
         // If preference contains intent, log it before handling.
         mMetricsFeatureProvider.logDashboardStartIntent(
                 getContext(), preference.getIntent(), getMetricsCategory());
         // Give all controllers a chance to handle click.
         for (AbstractPreferenceController controller : controllers) {
             if (controller.handlePreferenceTreeClick(preference)) {
                 return true;
             }
         }
         return super.onPreferenceTreeClick(preference);
     }

     @Override
     public void onStop() {
         super.onStop();
         if (mSummaryLoader != null) {
             // SummaryLoader can be null when there is no dynamic tiles.
             mSummaryLoader.setListening(false);
         }
         if (mListeningToCategoryChange) {
             final Activity activity = getActivity();
             if (activity instanceof SettingsDrawerActivity) {
                 ((SettingsDrawerActivity) activity).remCategoryListener(this);
             }
             mListeningToCategoryChange = false;
         }
     }

     protected <T extends AbstractPreferenceController> T getPreferenceController(Class<T> clazz) {
         AbstractPreferenceController controller = mPreferenceControllers.get(clazz);
         return (T) controller;
     }

     protected void addPreferenceController(AbstractPreferenceController controller) {
         mPreferenceControllers.put(controller.getClass(), controller);
     }

     /**
      * Returns the CategoryKey for loading {@link DashboardCategory} for this fragment.
      */
     @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
     public String getCategoryKey() {
         return DashboardFragmentRegistry.PARENT_TO_CATEGORY_KEY_MAP.get(getClass().getName());
     }

     /**
      * Get the tag string for logging.
      */
     protected abstract String getLogTag();

     /**
      * Get the res id for static preference xml for this fragment.
      */
     protected abstract int getPreferenceScreenResId();

     /**
      * Get a list of {@link AbstractPreferenceController} for this fragment.
      */
     protected abstract List<AbstractPreferenceController> getPreferenceControllers(Context context);

     /**
      * Returns true if this tile should be displayed
      */
     protected boolean displayTile(Tile tile) {
         return true;
     }

     @VisibleForTesting
     boolean tintTileIcon(Tile tile) {
         if (tile.icon == null) {
             return false;
         }
         // First check if the tile has set the icon tintable metadata.
         final Bundle metadata = tile.metaData;
         if (metadata != null
                 && metadata.containsKey(TileUtils.META_DATA_PREFERENCE_ICON_TINTABLE)) {
             return metadata.getBoolean(TileUtils.META_DATA_PREFERENCE_ICON_TINTABLE);
         }
         final String pkgName = getContext().getPackageName();
         // If this drawable is coming from outside Settings, tint it to match the color.
         return pkgName != null && tile.intent != null
                 && !pkgName.equals(tile.intent.getComponent().getPackageName());
     }

     /**
      * Displays resource based tiles.
      */
     private void displayResourceTiles() {
         final int resId = getPreferenceScreenResId();
         if (resId <= 0) {
             return;
         }
         addPreferencesFromResource(resId);
         final PreferenceScreen screen = getPreferenceScreen();
         Collection<AbstractPreferenceController> controllers = mPreferenceControllers.values();
         for (AbstractPreferenceController controller : controllers) {
             controller.displayPreference(screen);
         }
     }

     /**
      * Update state of each preference managed by PreferenceController.
      */
     protected void updatePreferenceStates() {
         Collection<AbstractPreferenceController> controllers = mPreferenceControllers.values();
         final PreferenceScreen screen = getPreferenceScreen();
         for (AbstractPreferenceController controller : controllers) {
             if (!controller.isAvailable()) {
                 continue;
             }
             final String key = controller.getPreferenceKey();

             final Preference preference = mProgressiveDisclosureMixin.findPreference(screen, key);
             if (preference == null) {
                 Log.d(TAG, String.format("Cannot find preference with key %s in Controller %s",
                         key, controller.getClass().getSimpleName()));
                 continue;
             }
             controller.updateState(preference);
         }
     }

     /**
      * Refresh all preference items, including both static prefs from xml, and dynamic items from
      * DashboardCategory.
      */
     private void refreshAllPreferences(final String TAG) {
         // First remove old preferences.
         if (getPreferenceScreen() != null) {
             // Intentionally do not cache PreferenceScreen because it will be recreated later.
             getPreferenceScreen().removeAll();
         }

         // Add resource based tiles.
         displayResourceTiles();
         mProgressiveDisclosureMixin.collapse(getPreferenceScreen());

         refreshDashboardTiles(TAG);
     }

     /**
      * Refresh preference items backed by DashboardCategory.
      */
     @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
     void refreshDashboardTiles(final String TAG) {
         final PreferenceScreen screen = getPreferenceScreen();

         final DashboardCategory category =
                 mDashboardFeatureProvider.getTilesForCategory(getCategoryKey());
         if (category == null) {
             Log.d(TAG, "NO dashboard tiles for " + TAG);
             return;
         }
         List<Tile> tiles = category.tiles;
         if (tiles == null) {
             Log.d(TAG, "tile list is empty, skipping category " + category.title);
             return;
         }
         // Create a list to track which tiles are to be removed.
         final List<String> remove = new ArrayList<>(mDashboardTilePrefKeys);

         // There are dashboard tiles, so we need to install SummaryLoader.
         if (mSummaryLoader != null) {
             mSummaryLoader.release();
         }
         final Context context = getContext();
         mSummaryLoader = new SummaryLoader(getActivity(), getCategoryKey());
         mSummaryLoader.setSummaryConsumer(this);
         final TypedArray a = context.obtainStyledAttributes(new int[]{
                 android.R.attr.colorControlNormal});
         final int tintColor = a.getColor(0, context.getColor(android.R.color.white));
         a.recycle();
         // Install dashboard tiles.
         for (Tile tile : tiles) {
             final String key = mDashboardFeatureProvider.getDashboardKeyForTile(tile);
             if (TextUtils.isEmpty(key)) {
                 Log.d(TAG, "tile does not contain a key, skipping " + tile);
                 continue;
             }
             if (!displayTile(tile)) {
                 continue;
             }
             if (tintTileIcon(tile)) {
                 tile.icon.setTint(tintColor);
             }
             if (mDashboardTilePrefKeys.contains(key)) {
                 // Have the key already, will rebind.
                 final Preference preference = mProgressiveDisclosureMixin.findPreference(
                         screen, key);
                 mDashboardFeatureProvider.bindPreferenceToTile(getActivity(), getMetricsCategory(),
                         preference, tile, key, mPlaceholderPreferenceController.getOrder());
             } else {
                 // Don't have this key, add it.
                 final Preference pref = new Preference(getPrefContext());
                 mDashboardFeatureProvider.bindPreferenceToTile(getActivity(), getMetricsCategory(),
                         pref, tile, key, mPlaceholderPreferenceController.getOrder());
                 mProgressiveDisclosureMixin.addPreference(screen, pref);
                 mDashboardTilePrefKeys.add(key);
             }
             remove.remove(key);
         }
         // Finally remove tiles that are gone.
         for (String key : remove) {
             mDashboardTilePrefKeys.remove(key);
             mProgressiveDisclosureMixin.removePreference(screen, key);
         }
         mSummaryLoader.setListening(true);
     }
 }
	/*
	* Copyright (C) 2016 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.settings.dashboard;

	import android.app.Activity;
	import android.content.Context;
	import android.content.res.TypedArray;
	import android.os.Bundle;
	import android.support.annotation.VisibleForTesting;
	import android.support.v7.preference.Preference;
	import android.support.v7.preference.PreferenceManager;
	import android.support.v7.preference.PreferenceScreen;
	import android.text.TextUtils;
	import android.util.ArrayMap;
	import android.util.ArraySet;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;

	import com.android.settings.SettingsPreferenceFragment;
	import com.android.settings.overlay.FeatureFactory;
	import com.android.settings.search.Indexable;
	import com.android.settingslib.core.AbstractPreferenceController;
	import com.android.settingslib.drawer.DashboardCategory;
	import com.android.settingslib.drawer.SettingsDrawerActivity;
	import com.android.settingslib.drawer.Tile;
	import com.android.settingslib.drawer.TileUtils;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.List;
	import java.util.Map;
	import java.util.Set;

	/**
	* Base fragment for dashboard style UI containing a list of static and dynamic setting items.
	*/
	public abstract class DashboardFragment extends SettingsPreferenceFragment
	implements SettingsDrawerActivity.CategoryListener, Indexable,
	SummaryLoader.SummaryConsumer {
	private static final String TAG = "DashboardFragment";

	private final Map<Class, AbstractPreferenceController> mPreferenceControllers =
	new ArrayMap<>();
	private final Set<String> mDashboardTilePrefKeys = new ArraySet<>();

	protected ProgressiveDisclosureMixin mProgressiveDisclosureMixin;
	protected DashboardFeatureProvider mDashboardFeatureProvider;
	private DashboardTilePlaceholderPreferenceController mPlaceholderPreferenceController;
	private boolean mListeningToCategoryChange;
	private SummaryLoader mSummaryLoader;

	@Override
	public void onAttach(Context context) {
	super.onAttach(context);
	mDashboardFeatureProvider =
	FeatureFactory.getFactory(context).getDashboardFeatureProvider(context);
	mProgressiveDisclosureMixin = mDashboardFeatureProvider
	.getProgressiveDisclosureMixin(context, this, getArguments());
	getLifecycle().addObserver(mProgressiveDisclosureMixin);

	List<AbstractPreferenceController> controllers = getPreferenceControllers(context);
	if (controllers == null) {
	controllers = new ArrayList<>();
	}
	mPlaceholderPreferenceController =
	new DashboardTilePlaceholderPreferenceController(context);
	controllers.add(mPlaceholderPreferenceController);
	for (AbstractPreferenceController controller : controllers) {
	addPreferenceController(controller);
	}
	}

	@Override
	public void onCreate(Bundle icicle) {
	super.onCreate(icicle);
	// Set ComparisonCallback so we get better animation when list changes.
	getPreferenceManager().setPreferenceComparisonCallback(
	new PreferenceManager.SimplePreferenceComparisonCallback());
	// Upon rotation configuration change we need to update preference states before any
	// editing dialog is recreated (that would happen before onResume is called).
	updatePreferenceStates();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	final View view = super.onCreateView(inflater, container, savedInstanceState);
	return view;
	}

	@Override
	public void onCategoriesChanged() {
	final DashboardCategory category =
	mDashboardFeatureProvider.getTilesForCategory(getCategoryKey());
	if (category == null) {
	return;
	}
	refreshDashboardTiles(getLogTag());
	}

	@Override
	public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
	super.onCreatePreferences(savedInstanceState, rootKey);
	refreshAllPreferences(getLogTag());
	}

	@Override
	public void onStart() {
	super.onStart();
	final DashboardCategory category =
	mDashboardFeatureProvider.getTilesForCategory(getCategoryKey());
	if (category == null) {
	return;
	}
	if (mSummaryLoader != null) {
	// SummaryLoader can be null when there is no dynamic tiles.
	mSummaryLoader.setListening(true);
	}
	final Activity activity = getActivity();
	if (activity instanceof SettingsDrawerActivity) {
	mListeningToCategoryChange = true;
	((SettingsDrawerActivity) activity).addCategoryListener(this);
	}
	}

	@Override
	public void notifySummaryChanged(Tile tile) {
	final String key = mDashboardFeatureProvider.getDashboardKeyForTile(tile);
	final Preference pref = mProgressiveDisclosureMixin.findPreference(
	getPreferenceScreen(), key);
	if (pref == null) {
	Log.d(getLogTag(),
	String.format("Can't find pref by key %s, skipping update summary %s/%s",
	key, tile.title, tile.summary));
	return;
	}
	pref.setSummary(tile.summary);
	}

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

	@Override
	public boolean onPreferenceTreeClick(Preference preference) {
	Collection<AbstractPreferenceController> controllers = mPreferenceControllers.values();
	// If preference contains intent, log it before handling.
	mMetricsFeatureProvider.logDashboardStartIntent(
	getContext(), preference.getIntent(), getMetricsCategory());
	// Give all controllers a chance to handle click.
	for (AbstractPreferenceController controller : controllers) {
	if (controller.handlePreferenceTreeClick(preference)) {
	return true;
	}
	}
	return super.onPreferenceTreeClick(preference);
	}

	@Override
	public void onStop() {
	super.onStop();
	if (mSummaryLoader != null) {
	// SummaryLoader can be null when there is no dynamic tiles.
	mSummaryLoader.setListening(false);
	}
	if (mListeningToCategoryChange) {
	final Activity activity = getActivity();
	if (activity instanceof SettingsDrawerActivity) {
	((SettingsDrawerActivity) activity).remCategoryListener(this);
	}
	mListeningToCategoryChange = false;
	}
	}

	protected <T extends AbstractPreferenceController> T getPreferenceController(Class<T> clazz) {
	AbstractPreferenceController controller = mPreferenceControllers.get(clazz);
	return (T) controller;
	}

	protected void addPreferenceController(AbstractPreferenceController controller) {
	mPreferenceControllers.put(controller.getClass(), controller);
	}

	/**
	* Returns the CategoryKey for loading {@link DashboardCategory} for this fragment.
	*/
	@VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
	public String getCategoryKey() {
	return DashboardFragmentRegistry.PARENT_TO_CATEGORY_KEY_MAP.get(getClass().getName());
	}

	/**
	* Get the tag string for logging.
	*/
	protected abstract String getLogTag();

	/**
	* Get the res id for static preference xml for this fragment.
	*/
	protected abstract int getPreferenceScreenResId();

	/**
	* Get a list of {@link AbstractPreferenceController} for this fragment.
	*/
	protected abstract List<AbstractPreferenceController> getPreferenceControllers(Context context);

	/**
	* Returns true if this tile should be displayed
	*/
	protected boolean displayTile(Tile tile) {
	return true;
	}

	@VisibleForTesting
	boolean tintTileIcon(Tile tile) {
	if (tile.icon == null) {
	return false;
	}
	// First check if the tile has set the icon tintable metadata.
	final Bundle metadata = tile.metaData;
	if (metadata != null
	&& metadata.containsKey(TileUtils.META_DATA_PREFERENCE_ICON_TINTABLE)) {
	return metadata.getBoolean(TileUtils.META_DATA_PREFERENCE_ICON_TINTABLE);
	}
	final String pkgName = getContext().getPackageName();
	// If this drawable is coming from outside Settings, tint it to match the color.
	return pkgName != null && tile.intent != null
	&& !pkgName.equals(tile.intent.getComponent().getPackageName());
	}

	/**
	* Displays resource based tiles.
	*/
	private void displayResourceTiles() {
	final int resId = getPreferenceScreenResId();
	if (resId <= 0) {
	return;
	}
	addPreferencesFromResource(resId);
	final PreferenceScreen screen = getPreferenceScreen();
	Collection<AbstractPreferenceController> controllers = mPreferenceControllers.values();
	for (AbstractPreferenceController controller : controllers) {
	controller.displayPreference(screen);
	}
	}

	/**
	* Update state of each preference managed by PreferenceController.
	*/
	protected void updatePreferenceStates() {
	Collection<AbstractPreferenceController> controllers = mPreferenceControllers.values();
	final PreferenceScreen screen = getPreferenceScreen();
	for (AbstractPreferenceController controller : controllers) {
	if (!controller.isAvailable()) {
	continue;
	}
	final String key = controller.getPreferenceKey();

	final Preference preference = mProgressiveDisclosureMixin.findPreference(screen, key);
	if (preference == null) {
	Log.d(TAG, String.format("Cannot find preference with key %s in Controller %s",
	key, controller.getClass().getSimpleName()));
	continue;
	}
	controller.updateState(preference);
	}
	}

	/**
	* Refresh all preference items, including both static prefs from xml, and dynamic items from
	* DashboardCategory.
	*/
	private void refreshAllPreferences(final String TAG) {
	// First remove old preferences.
	if (getPreferenceScreen() != null) {
	// Intentionally do not cache PreferenceScreen because it will be recreated later.
	getPreferenceScreen().removeAll();
	}

	// Add resource based tiles.
	displayResourceTiles();
	mProgressiveDisclosureMixin.collapse(getPreferenceScreen());

	refreshDashboardTiles(TAG);
	}

	/**
	* Refresh preference items backed by DashboardCategory.
	*/
	@VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
	void refreshDashboardTiles(final String TAG) {
	final PreferenceScreen screen = getPreferenceScreen();

	final DashboardCategory category =
	mDashboardFeatureProvider.getTilesForCategory(getCategoryKey());
	if (category == null) {
	Log.d(TAG, "NO dashboard tiles for " + TAG);
	return;
	}
	List<Tile> tiles = category.tiles;
	if (tiles == null) {
	Log.d(TAG, "tile list is empty, skipping category " + category.title);
	return;
	}
	// Create a list to track which tiles are to be removed.
	final List<String> remove = new ArrayList<>(mDashboardTilePrefKeys);

	// There are dashboard tiles, so we need to install SummaryLoader.
	if (mSummaryLoader != null) {
	mSummaryLoader.release();
	}
	final Context context = getContext();
	mSummaryLoader = new SummaryLoader(getActivity(), getCategoryKey());
	mSummaryLoader.setSummaryConsumer(this);
	final TypedArray a = context.obtainStyledAttributes(new int[]{
	android.R.attr.colorControlNormal});
	final int tintColor = a.getColor(0, context.getColor(android.R.color.white));
	a.recycle();
	// Install dashboard tiles.
	for (Tile tile : tiles) {
	final String key = mDashboardFeatureProvider.getDashboardKeyForTile(tile);
	if (TextUtils.isEmpty(key)) {
	Log.d(TAG, "tile does not contain a key, skipping " + tile);
	continue;
	}
	if (!displayTile(tile)) {
	continue;
	}
	if (tintTileIcon(tile)) {
	tile.icon.setTint(tintColor);
	}
	if (mDashboardTilePrefKeys.contains(key)) {
	// Have the key already, will rebind.
	final Preference preference = mProgressiveDisclosureMixin.findPreference(
	screen, key);
	mDashboardFeatureProvider.bindPreferenceToTile(getActivity(), getMetricsCategory(),
	preference, tile, key, mPlaceholderPreferenceController.getOrder());
	} else {
	// Don't have this key, add it.
	final Preference pref = new Preference(getPrefContext());
	mDashboardFeatureProvider.bindPreferenceToTile(getActivity(), getMetricsCategory(),
	pref, tile, key, mPlaceholderPreferenceController.getOrder());
	mProgressiveDisclosureMixin.addPreference(screen, pref);
	mDashboardTilePrefKeys.add(key);
	}
	remove.remove(key);
	}
	// Finally remove tiles that are gone.
	for (String key : remove) {
	mDashboardTilePrefKeys.remove(key);
	mProgressiveDisclosureMixin.removePreference(screen, key);
	}
	mSummaryLoader.setListening(true);
	}
	}