Android：如何在 AppWidgetProvider 中创建警报
我的小部件应该每天 0:00 刷新其文本视图。在 widget_provider.xml 中，我设置了 android:updatePeriodMillis="1000" 但我读到最小更新周期是 30 分钟，我必须为此使用 AlarmManager。所以我想要一个每天 0:00 触发刷新的闹钟。 UpdateService.class 处理刷新（根据日期为文本视图设置文本。该类直到午夜后半小时左右才会被调用）
在 public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)< /code> 方法我正在使用这段代码：
Intent intentN = new Intent(context, UpdateService.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(context.ALARM_SERVICE);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
cal.add(Calendar.HOUR_OF_DAY, 0);
cal.add(Calendar.MINUTE, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 24*60*60*1000, pendingIntent);
在复制剪切的 Eclipse 的第三行中说：
The method getSystemService(String) is undefined for the type HelloWidget
HelloWidget 是 AppWidgetProvider 的名称。
谢谢
my widget should refresh its textviews every day at 0:00. In the widget_provider.xml I set android:updatePeriodMillis="1000" but I read that the minimum update period is 30 minutes and I have to use alarmManager for this. So i want an alarm that triggers the refresh every day at 0:00. UpdateService.class handles the refreshing (setting texts for textviews based on date. The class is just not called until around half an hour after midnight)
In the public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) method I am using this code:
Intent intentN = new Intent(context, UpdateService.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(context.ALARM_SERVICE);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
cal.add(Calendar.HOUR_OF_DAY, 0);
cal.add(Calendar.MINUTE, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 24*60*60*1000, pendingIntent);
In the third line of the copied cut Eclipse says:
The method getSystemService(String) is undefined for the type HelloWidget
HelloWidget is the name of the AppWidgetProvider.
Thanks
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