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Android 3.0自带的天气预报例子代码

 2011-03-19 11:57:21 来源:本站整理   
核心提示: } @Override public void onEnabled(Context context) { //当appWidget添加到桌面上时 final ContentResolver r = context.getContentResolver(); if (sDataObserver == nul

   }

   @Override
   public void onEnabled(Context context) { //当appWidget添加到桌面上时
       final ContentResolver r = context.getContentResolver();
     if (sDataObserver == null) {
       final AppWidgetManager mgr = AppWidgetManager.getInstance(context);
       final ComponentName cn = new ComponentName(context, WeatherWidgetProvider.class);
       sDataObserver = new WeatherDataProviderObserver(mgr, cn, sWorkerQueue);
       r.registerContentObserver(WeatherDataProvider.CONTENT_URI, true, sDataObserver); //注册监控数据库变化的回调
     }
   }

   @Override
   public void onReceive(Context ctx, Intent intent) {
     final String action = intent.getAction();
     if (action.equals(REFRESH_ACTION)) { //接收数据库改变的回调广播
         final Context context = ctx;
       sWorkerQueue.removeMessages(0);
       sWorkerQueue.post(new Runnable() {
         @Override
         public void run() {
           final ContentResolver r = context.getContentResolver();
           final Cursor c = r.query(WeatherDataProvider.CONTENT_URI, null, null, null,
               null);
           final int count = c.getCount();
           final int maxDegrees = 96;

         r.unregisterContentObserver(sDataObserver); //首先取消数据库监控
           for (int i = 0; i < count; ++i) {
             final Uri uri = ContentUris.withAppendedId(WeatherDataProvider.CONTENT_URI, i);
             final ContentValues values = new ContentValues();
             values.put(WeatherDataProvider.Columns.TEMPERATURE,
                 new Random().nextInt(maxDegrees));
             r.update(uri, values, null, null); //更新数据库记录层
           }
           r.registerContentObserver(WeatherDataProvider.CONTENT_URI, true, sDataObserver); //重新设置监视数据库

         final AppWidgetManager mgr = AppWidgetManager.getInstance(context);
           final ComponentName cn = new ComponentName(context, WeatherWidgetProvider.class);
           mgr.notifyAppWidgetViewDataChanged(mgr.getAppWidgetIds(cn), R.id.weather_list); //提示Widget有数据更新并刷新UI

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Tags:Android 自带 天气预报

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