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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 import android.view.LayoutInflater;
     25 import android.view.View;
     26 
     27 import java.util.ArrayList;
     28 
     29 
     30 /**
     31  * Specific {@link AppWidgetHost} that creates our {@link LauncherAppWidgetHostView}
     32  * which correctly captures all long-press events. This ensures that users can
     33  * always pick up and move widgets.
     34  */
     35 public class LauncherAppWidgetHost extends AppWidgetHost {
     36 
     37     private final ArrayList<Runnable> mProviderChangeListeners = new ArrayList<Runnable>();
     38 
     39     private int mQsbWidgetId = -1;
     40     private Launcher mLauncher;
     41 
     42     public LauncherAppWidgetHost(Launcher launcher, int hostId) {
     43         super(launcher, hostId);
     44         mLauncher = launcher;
     45     }
     46 
     47     public void setQsbWidgetId(int widgetId) {
     48         mQsbWidgetId = widgetId;
     49     }
     50 
     51     @Override
     52     protected AppWidgetHostView onCreateView(Context context, int appWidgetId,
     53             AppWidgetProviderInfo appWidget) {
     54         if (appWidgetId == mQsbWidgetId) {
     55             return new LauncherAppWidgetHostView(context) {
     56 
     57                 @Override
     58                 protected View getErrorView() {
     59                     // For the QSB, show an empty view instead of an error view.
     60                     return new View(getContext());
     61                 }
     62             };
     63         }
     64         return new LauncherAppWidgetHostView(context);
     65     }
     66 
     67     @Override
     68     public void startListening() {
     69         try {
     70             super.startListening();
     71         } catch (Exception e) {
     72             if (e.getCause() instanceof TransactionTooLargeException) {
     73                 // We're willing to let this slide. The exception is being caused by the list of
     74                 // RemoteViews which is being passed back. The startListening relationship will
     75                 // have been established by this point, and we will end up populating the
     76                 // widgets upon bind anyway. See issue 14255011 for more context.
     77             } else {
     78                 throw new RuntimeException(e);
     79             }
     80         }
     81     }
     82 
     83     @Override
     84     public void stopListening() {
     85         super.stopListening();
     86         clearViews();
     87     }
     88 
     89     public void addProviderChangeListener(Runnable callback) {
     90         mProviderChangeListeners.add(callback);
     91     }
     92 
     93     public void removeProviderChangeListener(Runnable callback) {
     94         mProviderChangeListeners.remove(callback);
     95     }
     96 
     97     protected void onProvidersChanged() {
     98         mLauncher.getModel().loadAndBindWidgetsAndShortcuts(mLauncher, mLauncher,
     99                 true /* refresh */);
    100         if (!mProviderChangeListeners.isEmpty()) {
    101             for (Runnable callback : new ArrayList<>(mProviderChangeListeners)) {
    102                 callback.run();
    103             }
    104         }
    105     }
    106 
    107     public AppWidgetHostView createView(Context context, int appWidgetId,
    108             LauncherAppWidgetProviderInfo appWidget) {
    109         if (appWidget.isCustomWidget) {
    110             LauncherAppWidgetHostView lahv = new LauncherAppWidgetHostView(context);
    111             LayoutInflater inflater = (LayoutInflater)
    112                     context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    113             inflater.inflate(appWidget.initialLayout, lahv);
    114             lahv.setAppWidget(0, appWidget);
    115             lahv.updateLastInflationOrientation();
    116             return lahv;
    117         } else {
    118             return super.createView(context, appWidgetId, appWidget);
    119         }
    120     }
    121 
    122     /**
    123      * Called when the AppWidget provider for a AppWidget has been upgraded to a new apk.
    124      */
    125     @Override
    126     protected void onProviderChanged(int appWidgetId, AppWidgetProviderInfo appWidget) {
    127         LauncherAppWidgetProviderInfo info = LauncherAppWidgetProviderInfo.fromProviderInfo(
    128                 mLauncher, appWidget);
    129         super.onProviderChanged(appWidgetId, info);
    130     }
    131 }
    132