我正在使用Xamarin Forms开发一个Android应用程序,该应用程序由一个界面以及一个后台服务组成。
关闭接口应用程序时,我还需要该服务也能正常工作。
如果我在服务中添加“ IsolatedProcess = true”,则图形界面仍然可以使用,但服务会崩溃。
我读了很多帖子,提供了可能的解决方案,但是它们不起作用。 (我尝试在发布模式下进行编译,还删除了“使用共享运行时”标志)。

我正在使用Android 8.1(Oreo)作为目标框架进行编译。
目标环境是Android 4.2。

我将服务启动到MainActivity类的OnCreate方法中:

Intent testIntent = new Intent(this.BaseContext, typeof(TestService));
StartService(testIntent);


服务类别:

[Service(IsolatedProcess = true, Exported = true, Label = "TestService")]
public class TestService : Service
{

    public override IBinder OnBind(Intent intent)
    {
        return null;
    }

    public override void OnCreate()
    {
        base.OnCreate();

    }

    [return: GeneratedEnum]
    public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
    {
        Device.StartTimer(new TimeSpan(0, 0, 40), () =>
        {
            //Code executed every 40 seconds
        });

        base.OnStartCommand(intent, flags, startId);
        return StartCommandResult.Sticky;

    }

    public override bool StopService(Intent name)
    {
        return base.StopService(name);
    }

}


如果删除“ IsolatedProcess = true”,该服务将起作用,但是当我关闭应用程序接口进程时,它将停止。

最佳答案

通过将属性IsolatedProcess的值更改为true,删除了Device.StartTimer指令并引入了BroadcastReceiver,我解决了该问题。

MainActivity类:

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        public static Intent testServiceIntent;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(savedInstanceState);
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

            testServiceIntent = new Intent(this.BaseContext, typeof(TestService));

            LoadApplication(new App());
        }
    }


服务类别:

[Service(IsolatedProcess = false, Exported = true, Label = "TestService")]
    public class TestService : Service
    {
System.Threading.Timer _timer;

        public override IBinder OnBind(Intent intent)
        {
            return null;
        }

        public override void OnCreate()
        {
            base.OnCreate();
        }

        [return: GeneratedEnum]
        public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
        {
            businessLogicMethod();

            base.OnStartCommand(intent, flags, startId);
            return StartCommandResult.Sticky;

        }

public void businessLogicMethod()
        {
 //My business logic in a System.Threading.Timer

}
}


广播接收器类:

[BroadcastReceiver]
    [IntentFilter(new[] { Intent.ActionBootCompleted })]
    public class TestApplicationBroadcastReceiver : BroadcastReceiver
    {
        public override void OnReceive(Context context, Intent intent)
        {
            Log.Info("TestApp", "******* Loading Application *******");

            try
            {
                if (intent.Action.Equals(Intent.ActionBootCompleted))
                {
                    Intent service = new Intent(context, typeof(TestService));
                    service.AddFlags(ActivityFlags.NewTask);
                    context.StartService(service);
                }
            }
            catch (Exception ex)
            {
                Log.Error("TestApp", "******* Error message *******: " + ex.Message);
            }
        }
    }


我希望这对某人有用。

关于c# - Xamarin Forms Service与IsolatedProcess崩溃,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/53169377/

10-10 15:25