Home | History | Annotate | Download | only in stackwidget 
      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
     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 
     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 
     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 
     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 
     72     public int getCount() {
     73         return mCount;
     74     }
     75 
     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 
    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 
    113     public int getViewTypeCount() {
    114         return 1;
    115     }
    116 
    117     public long getItemId(int position) {
    118         return position;
    119     }
    120 
    121     public boolean hasStableIds() {
    122         return true;
    123     }
    124 
    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 }