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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.DeadObjectException;
     24 import android.os.TransactionTooLargeException;
     25 import android.view.LayoutInflater;
     26 import android.view.View;
     27 
     28 import java.util.ArrayList;
     29 
     30 
     31 /**
     32  * Specific {@link AppWidgetHost} that creates our {@link LauncherAppWidgetHostView}
     33  * which correctly captures all long-press events. This ensures that users can
     34  * always pick up and move widgets.
     35  */
     36 public class LauncherAppWidgetHost extends AppWidgetHost {
     37 
     38     private final ArrayList<Runnable> mProviderChangeListeners = new ArrayList<Runnable>();
     39 
     40     private int mQsbWidgetId = -1;
     41     private Launcher mLauncher;
     42 
     43     public LauncherAppWidgetHost(Launcher launcher, int hostId) {
     44         super(launcher, hostId);
     45         mLauncher = launcher;
     46     }
     47 
     48     public void setQsbWidgetId(int widgetId) {
     49         mQsbWidgetId = widgetId;
     50     }
     51 
     52     @Override
     53     protected AppWidgetHostView onCreateView(Context context, int appWidgetId,
     54             AppWidgetProviderInfo appWidget) {
     55         if (appWidgetId == mQsbWidgetId) {
     56             return new LauncherAppWidgetHostView(context) {
     57 
     58                 @Override
     59                 protected View getErrorView() {
     60                     // For the QSB, show an empty view instead of an error view.
     61                     return new View(getContext());
     62                 }
     63             };
     64         }
     65         return new LauncherAppWidgetHostView(context);
     66     }
     67 
     68     @Override
     69     public void startListening() {
     70         try {
     71             super.startListening();
     72         } catch (Exception e) {
     73             if (e.getCause() instanceof TransactionTooLargeException ||
     74                     e.getCause() instanceof DeadObjectException) {
     75                 // We're willing to let this slide. The exception is being caused by the list of
     76                 // RemoteViews which is being passed back. The startListening relationship will
     77                 // have been established by this point, and we will end up populating the
     78                 // widgets upon bind anyway. See issue 14255011 for more context.
     79             } else {
     80                 throw new RuntimeException(e);
     81             }
     82         }
     83     }
     84 
     85     @Override
     86     public void stopListening() {
     87         super.stopListening();
     88         clearViews();
     89     }
     90 
     91     public void addProviderChangeListener(Runnable callback) {
     92         mProviderChangeListeners.add(callback);
     93     }
     94 
     95     public void removeProviderChangeListener(Runnable callback) {
     96         mProviderChangeListeners.remove(callback);
     97     }
     98 
     99     protected void onProvidersChanged() {
    100         if (!mProviderChangeListeners.isEmpty()) {
    101             for (Runnable callback : new ArrayList<>(mProviderChangeListeners)) {
    102                 callback.run();
    103             }
    104         }
    105 
    106         if (Utilities.ATLEAST_MARSHMALLOW) {
    107             mLauncher.notifyWidgetProvidersChanged();
    108         }
    109     }
    110 
    111     public AppWidgetHostView createView(Context context, int appWidgetId,
    112             LauncherAppWidgetProviderInfo appWidget) {
    113         if (appWidget.isCustomWidget) {
    114             LauncherAppWidgetHostView lahv = new LauncherAppWidgetHostView(context);
    115             LayoutInflater inflater = (LayoutInflater)
    116                     context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    117             inflater.inflate(appWidget.initialLayout, lahv);
    118             lahv.setAppWidget(0, appWidget);
    119             lahv.updateLastInflationOrientation();
    120             return lahv;
    121         } else {
    122             return super.createView(context, appWidgetId, appWidget);
    123         }
    124     }
    125 
    126     /**
    127      * Called when the AppWidget provider for a AppWidget has been upgraded to a new apk.
    128      */
    129     @Override
    130     protected void onProviderChanged(int appWidgetId, AppWidgetProviderInfo appWidget) {
    131         LauncherAppWidgetProviderInfo info = LauncherAppWidgetProviderInfo.fromProviderInfo(
    132                 mLauncher, appWidget);
    133         super.onProviderChanged(appWidgetId, info);
    134         // The super method updates the dimensions of the providerInfo. Update the
    135         // launcher spans accordingly.
    136         info.initSpans();
    137     }
    138 }
    139