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[英]How to access textview in MainPage.xaml from MainActivity.cs in visual studio 2017
[英]How to make MainPage.xaml.cs talk to MainActivity.cs using interface
我正在尝试将这些类共享一些数据,我读到正确的方法是通过接口,但MainPage.xaml.cs无法识别“链接”。 我需要在MainPage.xaml.cs中添加什么才能使其正常工作?
将Class1.cs:
namespace interfaceWebnav
{
public interface IPortableInterface
{
object Test();
}
}
MediaService.cs
using interfaceWebnav;
namespace ComprarMusicas
{
public class MediaService : Java.Lang.Object, IPortableInterface
{
public object Test()
{
//do something
}
}
}
MainActivity.cs:
...
...
using interfaceWebnav;
[assembly: Dependency(typeof(IPortableInterface))]
namespace MyApp.Droid
{
[Activity(Label = "Comprar Músicas", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, NoHistory = true,ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate(Bundle savedInstanceState)
{
............
base.OnCreate(savedInstanceState);
global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
LoadApplication(new App());
}
}
public override void OnBackPressed()
{
// here I need to know what SomeMethod() from MainPage.xaml.cs is saying
}
}
MainPage.xaml.cs(我注释了一些让它工作的尝试):
using Xamarin.Forms;
// using interfaceWebnav;
// [assembly: Dependency(typeof(IPortableInterface))]
namespace MyApp
{
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
}
void SomeMethod(object sender, EventArgs e)
{
object resultado = DependencyService.Get<IPortableInterface>().Test();
}
}
在MainPage.xaml.cs上,visual studio讲述了SomeMethod:“命名空间不能直接包含成员作为字段或方法。”
关于“Get IPortableInterface”它说:
“无法找到类型或命名空间IPortableInterface的名称(您是否缺少using指令或程序集引用?)”
Add Class说你的android项目中的MediaService.cs从IPortableInterface继承它
public class MediaService : Java.Lang.Object, IPortableInterface
{
public void Test()
{
// your android platform specific implementation
}
}
在MainPage.cs文件中调用依赖项服务
namespace MyApp
{
public partial class MainPage : ContentPage
{
public bool foo = true; //just an example
public MainPage()
{
InitializeComponent();
}
}
//I suppose invoking any event lets says button click calling interface dependency service of android project
void Button_Clicked(object sender,EventArgs e)
{
object resultado = DependencyService.Get<IPortableInterface>().Test();
}
}
我希望这能帮到您
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