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检测最后一个被删除的小部件

发布于 2024-12-24 18:21:22 字数 91 浏览 3 评论 0原文

我创建了一个使用后台服务进行更新通知的小部件。

如果从主屏幕中删除最后一个小部件，我想停止后台服务。

如何检测主屏幕中剩余的小部件数量？

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ヅ她的身影、若隐若现 2024-12-31 18:21:22

好吧，我找到了一种不需要存储任何持久信息的方法。然而，即使这对我来说也像是一个黑客。在 onReceive 中插入以下内容 -

@Override
public void onReceive(Context context, Intent intent) {
        if (AppWidgetManager.ACTION_APPWIDGET_DELETED.equals(sIntentAction)) {
            AppWidgetManager amgr = AppWidgetManager.getInstance(context);
            int length = amgr.getAppWidgetIds(intent.getComponent()).length;
            if (length==0) WidgetService.StopService(context);
        }
        super.onReceive(context, intent);
}

它有效，并且是我能找到的最佳解决方案，但我对此不太满意。

我需要在 onReceive 而不是 onDeleted 中执行此操作，因为 intent 对象需要执行 intent.getComponent().我不喜欢这一事实，因为文档声称人们很少需要接触 onReceive，并且需要计算剩余的小部件似乎是 onDeleted 中的合理期望。然而不幸的是，它提供了被删除的小部件的计数，而不是剩余的计数。有什么方法可以在 onDeleted 中执行此操作吗？

（慢慢地，我似乎感觉到很多 Android 编码实际上是黑客行为 - 并且完成工作的代码大多使用无证或意想不到的途径。）

Ok, I figured out a way that doesn't involve having to store any persistent information. However even this looks like a hack to me. Inserted the following in the onReceive -

@Override
public void onReceive(Context context, Intent intent) {
        if (AppWidgetManager.ACTION_APPWIDGET_DELETED.equals(sIntentAction)) {
            AppWidgetManager amgr = AppWidgetManager.getInstance(context);
            int length = amgr.getAppWidgetIds(intent.getComponent()).length;
            if (length==0) WidgetService.StopService(context);
        }
        super.onReceive(context, intent);
}

It works, and is the best solution I could find, but I am not very happy with it.

I needed to do this in onReceive and not onDeleted, since the intent object is required to do intent.getComponent(). I don't like the fact because the documentation claims that one will rarely need to touch the onReceive, and need to count remaining widgets seems to be a reasonable expectation in onDeleted. However unfortunately it provides count of widgets being deleted, and not count remaining. Is there any way to do this in the onDeleted instead?

(Slowly I seem to get the feeling that a lot of Android coding is actually hacking - and the code to get a job done mostly uses undocumented or unexpected avenues.)

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夜访吸血鬼 2024-12-31 18:21:22

如果您为 Widget 创建了一个 AppWidgetProvider，它应该有一个 onUpdate() 方法。 onUpdate() 的参数之一是 int[] ids。这实际上是接收 onUpdate() 请求的所有 AppWidget 实例的数组。如果 ids 的大小为 1，那么下一个删除就是您的最后一个小部件。 :)

希望这有帮助，
模糊逻辑

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峩卟喜欢 2024-12-31 18:21:22

我的应用程序也遇到了类似的问题，这就是我最终要做的事情，以确定我是否删除了最后一个小部件，这使我能够停止服务并更新已保存的首选项。

@Override
public void onDisabled(Context context)
{
    // When this get called I need to figure out how to set the preference 
    // homeWidgetSetup = false.
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    ComponentName thisAppWidget = new ComponentName(context, BasicHomeWidget.class.getName());
    int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisAppWidget);

    if(appWidgetIds.length < 1)
    {
        Log.d(TAG, "Removed the last widget!");
        Intent intent = new Intent(context, KMMDService.class);
        intent.putExtra("lastWidgetDeleted", true);
        context.startService(intent);
    }
}

然后我只是测试了一下在 onStartCommand 上传递给我的服务的额外内容，如果“lastWidgetDeleted”定义为 true，那么我将停止服务并更新我的首选项。

I had a similar issue with my application and this is what I ended up doing to figure out if I had deleted the last widget or not, which allowed me to stop my service and update a preference item that was saved.

@Override
public void onDisabled(Context context)
{
    // When this get called I need to figure out how to set the preference 
    // homeWidgetSetup = false.
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    ComponentName thisAppWidget = new ComponentName(context, BasicHomeWidget.class.getName());
    int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisAppWidget);

    if(appWidgetIds.length < 1)
    {
        Log.d(TAG, "Removed the last widget!");
        Intent intent = new Intent(context, KMMDService.class);
        intent.putExtra("lastWidgetDeleted", true);
        context.startService(intent);
    }
}

Then I just tested looked at the extra passed to my service on onStartCommand and if has "lastWidgetDeleted" defined as true then I would stop the service and update my preferences.

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