xamarin.forms - CrossCurrentActivity.Current.Activity 为 NULL，尽管初始化和设置了事件

Question

我正在尝试使用 Montemagno 的 CrossCurrentActivity插件来解析 Xamarin.Forms.Android 项目中的当前事件。然而，CrossCurrentActivity.Current.Activity始终为空。我究竟做错了什么？

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

            base.OnCreate(bundle);

            Microsoft.WindowsAzure.MobileServices.CurrentPlatform.Init();                        
            global::Xamarin.Forms.Forms.Init(this, bundle);    

            CrossCurrentActivity.Current.Init(this, bundle);
            // CrossCurrentActivity.Current.Activity is NULL
            CrossCurrentActivity.Current.Activity = this;
            // CrossCurrentActivity.Current.Activity is still NULL

            var formsApp = new App(new AndroidInitializer());
            _registryContainer = formsApp.Container;    
            LoadApplication(formsApp);
        }

Answer 1

不设CrossCurrentActivity.Current.Activity你自己:CrossCurrentActivity.Current.Activity = this;
根据 github project你可以初始化 CrossCurrentActivity在 MainActivity.cs :CrossCurrentActivity.Current.Init(this, bundle);
或者你可以在 application level 中初始化它.