1 /*
2  * Copyright (C) 2011 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.example.android.stackwidget;
18 
19 import java.util.ArrayList;
20 import java.util.List;
21 
22 import android.appwidget.AppWidgetManager;
23 import android.content.Context;
24 import android.content.Intent;
25 import android.os.Bundle;
26 import android.widget.RemoteViews;
27 import android.widget.RemoteViewsService;
28 
29 public class StackWidgetService extends RemoteViewsService {
30     @Override
onGetViewFactory(Intent intent)31     public RemoteViewsFactory onGetViewFactory(Intent intent) {
32         return new StackRemoteViewsFactory(this.getApplicationContext(), intent);
33     }
34 }
35 
36 class StackRemoteViewsFactory implements RemoteViewsService.RemoteViewsFactory {
37     private static final int mCount = 10;
38     private List<WidgetItem> mWidgetItems = new ArrayList<WidgetItem>();
39     private Context mContext;
40     private int mAppWidgetId;
41 
StackRemoteViewsFactory(Context context, Intent intent)42     public StackRemoteViewsFactory(Context context, Intent intent) {
43         mContext = context;
44         mAppWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
45                 AppWidgetManager.INVALID_APPWIDGET_ID);
46     }
47 
onCreate()48     public void onCreate() {
49         // In onCreate() you setup any connections / cursors to your data source. Heavy lifting,
50         // for example downloading or creating content etc, should be deferred to onDataSetChanged()
51         // or getViewAt(). Taking more than 20 seconds in this call will result in an ANR.
52         for (int i = 0; i < mCount; i++) {
53             mWidgetItems.add(new WidgetItem(i + "!"));
54         }
55 
56         // We sleep for 3 seconds here to show how the empty view appears in the interim.
57         // The empty view is set in the StackWidgetProvider and should be a sibling of the
58         // collection view.
59         try {
60             Thread.sleep(3000);
61         } catch (InterruptedException e) {
62             e.printStackTrace();
63         }
64     }
65 
onDestroy()66     public void onDestroy() {
67         // In onDestroy() you should tear down anything that was setup for your data source,
68         // eg. cursors, connections, etc.
69         mWidgetItems.clear();
70     }
71 
getCount()72     public int getCount() {
73         return mCount;
74     }
75 
getViewAt(int position)76     public RemoteViews getViewAt(int position) {
77         // position will always range from 0 to getCount() - 1.
78 
79         // We construct a remote views item based on our widget item xml file, and set the
80         // text based on the position.
81         RemoteViews rv = new RemoteViews(mContext.getPackageName(), R.layout.widget_item);
82         rv.setTextViewText(R.id.widget_item, mWidgetItems.get(position).text);
83 
84         // Next, we set a fill-intent which will be used to fill-in the pending intent template
85         // which is set on the collection view in StackWidgetProvider.
86         Bundle extras = new Bundle();
87         extras.putInt(StackWidgetProvider.EXTRA_ITEM, position);
88         Intent fillInIntent = new Intent();
89         fillInIntent.putExtras(extras);
90         rv.setOnClickFillInIntent(R.id.widget_item, fillInIntent);
91 
92         // You can do heaving lifting in here, synchronously. For example, if you need to
93         // process an image, fetch something from the network, etc., it is ok to do it here,
94         // synchronously. A loading view will show up in lieu of the actual contents in the
95         // interim.
96         try {
97             System.out.println("Loading view " + position);
98             Thread.sleep(500);
99         } catch (InterruptedException e) {
100             e.printStackTrace();
101         }
102 
103         // Return the remote views object.
104         return rv;
105     }
106 
getLoadingView()107     public RemoteViews getLoadingView() {
108         // You can create a custom loading view (for instance when getViewAt() is slow.) If you
109         // return null here, you will get the default loading view.
110         return null;
111     }
112 
getViewTypeCount()113     public int getViewTypeCount() {
114         return 1;
115     }
116 
getItemId(int position)117     public long getItemId(int position) {
118         return position;
119     }
120 
hasStableIds()121     public boolean hasStableIds() {
122         return true;
123     }
124 
onDataSetChanged()125     public void onDataSetChanged() {
126         // This is triggered when you call AppWidgetManager notifyAppWidgetViewDataChanged
127         // on the collection view corresponding to this factory. You can do heaving lifting in
128         // here, synchronously. For example, if you need to process an image, fetch something
129         // from the network, etc., it is ok to do it here, synchronously. The widget will remain
130         // in its current state while work is being done here, so you don't need to worry about
131         // locking up the widget.
132     }
133 }