LauncherAppWidgetHost.java revision 0fc1be164e982433e619bcbb16aa67e28ff681ef 
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
17package com.android.launcher3;
18
19import android.appwidget.AppWidgetHost;
20import android.appwidget.AppWidgetHostView;
21import android.appwidget.AppWidgetProviderInfo;
22import android.content.Context;
23import android.os.TransactionTooLargeException;
24
25import 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 */
32public 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