在android中通过滑动杀死应用程序时如何执行代码? [英] How to execute code when app is killed by swiping in android?

问题描述

所以基本上我在 xamarin 上使用 C# 创建了一个应用程序，一切运行完美.我调用了一个事件处理程序，当我在 android 上按下后退按钮时，它不会退出应用程序，但它只是在后台移动它.为此，我使用了:

so basically i created an app using C# on xamarin and everything runs perfect. i called an event handler that when i press back button on android it doesen`t exit the app but it just moves it on background. For that i used :

public override void OnBackPressed()
    {
        MoveTaskToBack(true);
    }

现在我希望如果用户想通过从任务中滑动来终止应用程序，我希望它在关闭之前执行代码.我做了一些研究，发现我应该使用类似的东西:

Now i want that if the user wants to kill the app with swiping from task i want it to execute a code just before closing. I did some research and figured out i should use something like :

public override  void OnTaskRemoved( )
    {
    //the code here
    }

问题是，当我编写上面的代码时，我收到一条错误消息错误 CS0115 'MainActivity.OnTaskRemoved(Intent)':找不到合适的方法来覆盖"

The problem is that when i write the above code i get an error saying "Error CS0115 'MainActivity.OnTaskRemoved(Intent)': no suitable method found to override"

如果我删除覆盖，则没有错误，但是当应用程序被滑动杀死时，我放入的代码不会执行.有人可以帮忙吗?谢谢

If i remove override there is no error but the code i put inside is not executed when app is killed with swipe. Can someone help with this ? Thanks

推荐答案

向您的项目添加 Android 服务并覆盖 OnTaskRemoved 方法:

Add an Android Service to your project and override the OnTaskRemoved method:

[Service(Label = "TaskEndService")]
[IntentFilter(new String[] { "com.sushihangover.TaskEndService" })]
public class TaskEndService : Service
{
    IBinder binder;

    public override StartCommandResult OnStartCommand(Android.Content.Intent intent, StartCommandFlags flags, int startId)
    {
        return StartCommandResult.NotSticky;
    }

    public override IBinder OnBind(Intent intent)
    {
        binder = new TaskEndServiceBinder(this);
        return binder;
    }

    public override void OnTaskRemoved(Intent rootIntent)
    {
        Log.Info("SO", $"{GetType().Name} just got killed....");
        base.OnTaskRemoved(rootIntent);
    }
}

public class TaskEndServiceBinder : Binder
{
    readonly TaskEndService service;

    public TaskEndServiceBinder(TaskEndService service)
    {
        this.service = service;
    }

    public TaskEndService GetTaskEndService()
    {
        return service;
    }
}

在您的应用程序启动时启动服务，或者使用启动完成并在需要时使其sticky，等等...:

Start up the Service when your app starts, or use boot completed and make it sticky if needed, etc...:

StartService(new Intent(this, typeof(TaskEndService)));

然后，当有人从最近的应用列表中删除您的应用(滑动或关闭窗口)时，OnTaskRemoved 会被调用.在这个例子中，只记录事件:

Then when someone removes your app from the recent app list (swipe or window close tap), the OnTaskRemoved gets called. In this example, just logging the event:

05-04 19:31:27.635  3690  3690 I SO : TaskEndService just got killed....
05-04 19:31:27.636   543   909 I ActivityManager: Killing 3690:com.sushihangover.service_exit_foo/u0a83 (adj 1001): remove task

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