[英]Passing a string from an event to MainActivity in Android Xamarin Visual Studio
[英]Passing string/method form MainPage to MainActivity Xamarin
我想在MainActivity的MainPage中使用variabele或方法。 我已經為我的DependencyService創建了一個接口,但是我總是在遇到相同的錯誤
DependencyService.Get<IHPost>.HPost("R");
方法在給定的上下文中無效
我遵循了官方文檔,所以我在PCL中創建了我的界面:
IHPost(公共接口)
在Xamarin.Android中,我用[assembly:Dependency(typeof(HPost_droid))]行編寫了HPost_droid實現
在MainActivity中,我添加了此接口。
代碼:
IHPost.cs(接口)
namespace Xam
{
public interface IHPost
{
void HPost(string val);
}
}
MainPage.xaml.cs
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
// DependencyService.Get<IHPost>.HPost("R");
}
}
HPost_droid(類別)
[assembly: Dependency(typeof(HPost_droid))]
namespace Xam.Droid
{
class HPost_droid : Java.Lang.Object, IHPost
{
public HPost_droid() { }
public void HPost(string val)
{
System.Diagnostics.Debug.Write(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>" + val);
}
}
}
主要活動
[assembly: Xamarin.Forms.Dependency(typeof(IHPost))]
namespace Xam.Droid
{
[Activity(Label = "Xam", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : Xamarin.Forms.Platform.Android.FormsAppCompatActivity, IHPost
{
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
DependencyService.Get<IHPost>.HPost("R");
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
}
}
}
我按照這個完美的教程從頭開始嘗試應用程序: https : //wolfprogrammer.com/2016/08/05/dependency-services-with-xamarin-forms/ ,它可以正常工作!
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