将更新广播发送到应用程序小部件 [英] Sending an update broadcast to an app widget

问题描述

我有一个带有配置活动的应用程序小部件，当我单击活动中的确定"按钮时，我想触发该小部件的更新.我写了这段代码:

I have an app widget with a configure activity, and I want to trigger an update to the widget when an OK button in the activity is clicked. I wrote this code:

            Intent initialUpdateIntent=new Intent(AppWidgetManager.
                    ACTION_APPWIDGET_UPDATE);
            initialUpdateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
                    widgetID);
            sendBroadcast(initialUpdateIntent);

但是由于某种原因，未调用onUpdate函数！有谁知道可能是什么问题? 谢谢.

But for some reason the onUpdate function is not called! Does anyone know what the problem might be? Thanks.

推荐答案

尝试以下操作:

public static void updateWidgets(Context context) {
    Intent intent = new Intent(context.getApplicationContext(), DayActivitiesAppWidget.class);
    intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
    // Use an array and EXTRA_APPWIDGET_IDS instead of AppWidgetManager.EXTRA_APPWIDGET_ID,
    // since it seems the onUpdate() is only fired on that:
    AppWidgetManager widgetManager = AppWidgetManager.getInstance(context);
    int[] ids = widgetManager.getAppWidgetIds(new ComponentName(context, DayActivitiesAppWidget.class));

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
        widgetManager.notifyAppWidgetViewDataChanged(ids, android.R.id.list);

    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids);
    context.sendBroadcast(intent);
}

用您的AppWidgetProvider类替换DayActivitiesAppWidget，这样您就可以更新所有小部件实例，然后可以通过更新单个小部件实例来跟踪问题.

Replace DayActivitiesAppWidget with your AppWidgetProvider class this way u update all your widget instances, then you can track down the issue with updating a single widget instance.

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