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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher3;
     18 
     19 import android.appwidget.AppWidgetHost;
     20 import android.appwidget.AppWidgetHostView;
     21 import android.appwidget.AppWidgetProviderInfo;
     22 import android.content.Context;
     23 import android.os.TransactionTooLargeException;
     24 
     25 import java.util.ArrayList;
     26 
     27 /**
     28  * Specific {@link AppWidgetHost} that creates our {@link LauncherAppWidgetHostView}
     29  * which correctly captures all long-press events. This ensures that users can
     30  * always pick up and move widgets.
     31  */
     32 public class LauncherAppWidgetHost extends AppWidgetHost {
     33 
     34     private final ArrayList<Runnable> mProviderChangeListeners = new ArrayList<Runnable>();
     35 
     36     Launcher mLauncher;
     37 
     38     public LauncherAppWidgetHost(Launcher launcher, int hostId) {
     39         super(launcher, hostId);
     40         mLauncher = launcher;
     41     }
     42 
     43     @Override
     44     protected AppWidgetHostView onCreateView(Context context, int appWidgetId,
     45             AppWidgetProviderInfo appWidget) {
     46         return new LauncherAppWidgetHostView(context);
     47     }
     48 
     49     @Override
     50     public void startListening() {
     51         try {
     52             super.startListening();
     53         } catch (Exception e) {
     54             if (e.getCause() instanceof TransactionTooLargeException) {
     55                 // We're willing to let this slide. The exception is being caused by the list of
     56                 // RemoteViews which is being passed back. The startListening relationship will
     57                 // have been established by this point, and we will end up populating the
     58                 // widgets upon bind anyway. See issue 14255011 for more context.
     59             } else {
     60                 throw new RuntimeException(e);
     61             }
     62         }
     63     }
     64 
     65     @Override
     66     public void stopListening() {
     67         super.stopListening();
     68         clearViews();
     69     }
     70 
     71     public void addProviderChangeListener(Runnable callback) {
     72         mProviderChangeListeners.add(callback);
     73     }
     74 
     75     public void removeProviderChangeListener(Runnable callback) {
     76         mProviderChangeListeners.remove(callback);
     77     }
     78 
     79     protected void onProvidersChanged() {
     80         // Once we get the message that widget packages are updated, we need to rebind items
     81         // in AppsCustomize accordingly.
     82         mLauncher.bindPackagesUpdated(LauncherModel.getSortedWidgetsAndShortcuts(mLauncher));
     83 
     84         for (Runnable callback : mProviderChangeListeners) {
     85             callback.run();
     86         }
     87     }
     88 }
     89