无法从BroadcastReceiver更新Android小部件

Question

我想编写一个应用程序,在小部件中显示一些信息,应该不时更新.不时意味着,我使用闹钟定时器来触发peroidic更新.因此,问题intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);是:广播接收器意图为空.

这是我的小部件提供者:

public class MyWidgetProvider extends AppWidgetProvider {
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        final int N = appWidgetIds.length;      
    for(int i=0; i<N; i++) {
            int widgetId = appWidgetIds[i];         
            RemoteViews rViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);         
            Intent intent = new Intent(context.getApplicationContext(), TrafficService.class);
            intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);            
            rViews.setTextViewText(R.id.TextView01, "" + System.currentTimeMillis());           
            appWidgetManager.updateAppWidget(widgetId, rViews);
        }
    }
}

这是导致问题的BroadcastReceiver:

public class TimeIntervalReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
// set new alarm timer (code cut out)       
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context.getApplicationContext());
        // PROBLEM BELOW!
        int[] appWidgetIds = intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);     
        if(appWidgetIds == null) Log.d("TRAFFIC", "oh SHIT");
        if(appWidgetIds != null && appWidgetIds.length > 0) {
            for(int widgetId : appWidgetIds) {
                RemoteViews rViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
                rViews.setTextViewText(R.id.TextView01, "some data");
                appWidgetManager.updateAppWidget(widgetId, rViews);
            }
        }
    }
}

这甚至可以解决吗？

Answer 1

大声笑,我有答案......

简单地替换:

int[] appWidgetIds = intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);

通过

ComponentName thisWidget = new ComponentName(getApplicationContext(),MyWidgetProvider.class);
int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);