Xamarin 如何从 android 项目打开 xamarin 表单页面? [英] Xamarin how to open xamarin forms page from android project?

问题描述

我想从 Xamarin Android 项目打开 Xamarin 表单页面.在 android 项目中，我创建了工具栏项目图像，我在其中调用事件以从 Xamarin 表单项目中打开页面.

I want to open Xamarin forms page from Xamarin Android project. On android project I created toolabar item image, where I am calling event to open page from Xamarin forms project.

这是我的 MainActivity.cs 工具栏图片项实现:

Here is my MainActivity.cs toolabar image item implementation:

    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
    {
      private IMenu CurrentMenu { get; set; }
      private ImageView imgSmallC { get; set; }

      public override bool OnCreateOptionsMenu(IMenu menu)
            {
               ActionBar.DisplayOptions = ActionBarDisplayOptions.HomeAsUp | ActionBarDisplayOptions.ShowCustom | ActionBarDisplayOptions.ShowTitle | ActionBarDisplayOptions.ShowHome;  
                LayoutInflater inflater = (LayoutInflater)ActionBar.ThemedContext.GetSystemService(LayoutInflaterService);
                View customActionBarView = inflater.Inflate(Resource.Layout.actionbar_custom_view_done, null);  

                imgSmallC = (ImageView)customActionBarView.FindViewById<ImageView>(Resource.Id.ImgSmallC);

                imgSmallC.Click += (object sender, EventArgs args) =>
                {
                    StartActivity(typeof(MyPopupPage));
                };
                return base.OnCreateOptionsMenu(menu);
            }
}

在 StartActivity 中，我从 Xamarin 表单项目调用 MyPopupPage.xaml 页面，但不幸的是，当我调试项目并单击工具栏图像时，我收到这样的错误:

In StartActivity I am calling MyPopupPage.xaml page from Xamarin forms project, but unfortunately when I am debugging project and I click on toolbar image I get such a error:

System.ArgumentException:类型参数名称:类型不是派生的来自 java 类型.

System.ArgumentException: type Parameter name: Type is not derived from a java type.

推荐答案

你不能使用基于 Xamarin.Form 的 Page 作为 Android Activity，它们是两个完全不同的东西.

You can not use a Xamarin.Form based Page as an Android Activity, they are two completely different things.

您可以从 Xamarin.Android 项目访问 Xamarin.Forms Application 单例，并将其用于 PushModelAsync 或 PushAsync

You can access the Xamarin.Forms Application singleton from the Xamarin.Android project and use that to PushModelAsync or PushAsync

    await Xamarin.Forms.Application.Current.MainPage.Navigation.PushModalAsync(new PushPageFromNative.MyPage());

基于依赖服务的示例:

界面:

using System;
namespace PushPageFromNative
{
    public interface IShowForm
    {
        void PushPage();
    }
}

基于 Xamarin.Form 的代码:

Xamarin.Form-based code:

var pushFormBtn = new Button
{
    Text = "Push Form",
    VerticalOptions = LayoutOptions.CenterAndExpand,
    HorizontalOptions = LayoutOptions.CenterAndExpand,
};
pushFormBtn.Clicked += (sender, e) =>
{
        DependencyService.Get<IShowForm>().PushPage();
};

Xamarin.Android 依赖实现:

Xamarin.Android Dependancy Implementation:

async public void PushPage()
{
    // Do some Android specific things... and then push a new Forms' Page
    await Xamarin.Forms.Application.Current.MainPage.Navigation.PushModalAsync(new PushPageFromNative.MyPage());
}

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