Android fragments xamarin表单：向xaml添加片段

我试图使用本文中介绍的模式在Xamarin Forms项目中向UI添加一个本地android片段

用于承载片段的布局容器显示在屏幕上没有问题，但片段组件除外。在Android项目中看到的结果视图层次结构显示了嵌入的片段，但似乎没有实际渲染任何内容

一些代码：

    using Android.App;
    using Android.Content;
    using Android.OS;
    using Android.Runtime;
    using Android.Util;
    using Android.Views;
    using Android.Widget;
    using Xamarin.Forms;


    namespace NativeFeatures.Droid
    {

        public class TestNativeFragmentViewGroup : ViewGroup
        {
            Context context = Forms.Context;  // Android.App.Application.Context; // this is supposed to be the equivalent replacement but a crash occurs
            Android.Widget.Button buttonTest;

            public TestNativeFragmentViewGroup() : base(Forms.Context)
            {
                context = Forms.Context;  // ? Android.App.Application.Context; 

                this.Id = 43434;

                int minWidth = 300;
                int minHeight = 800;

                SetMinimumHeight(minHeight);
                SetMinimumWidth(minWidth);

                SetBackgroundColor(Android.Graphics.Color.Firebrick);

                buttonTest = new Android.Widget.Button(context);
                buttonTest.LayoutParameters = new LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent);
                buttonTest.SetBackgroundColor(new Android.Graphics.Color(Android.Graphics.Color.ForestGreen));
                buttonTest.BringToFront();
                buttonTest.Text = "Button Test";
                buttonTest.Id = 12347;
                AddView(buttonTest); // this works

                addTestFragment(); // layout appears to be there but no fragment

            }

        LinearLayout ll = null;
            private void addTestFragment()
            {
                ll = new LinearLayout(context);
                ll.Orientation = Orientation.Horizontal;
                LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(WindowManagerLayoutParams.MatchParent, WindowManagerLayoutParams.MatchParent);
                ll.LayoutParameters = layoutParams;
                ll.SetBackgroundColor(Android.Graphics.Color.LightGreen);

                ll.Id = 234567;

                ((Activity)context).FragmentManager.BeginTransaction().Add(ll.Id, TestFragment.newInstance("I am frag 1"), "someTag1").Commit();
                ((Activity)context).FragmentManager.BeginTransaction().Add(ll.Id, TestFragment.newInstance("I am frag 2"), "someTag2").Commit();


                AddView(ll);
            }


            protected override void OnLayout(bool changed, int left, int top, int right, int bottom)
            {

                if (buttonTest != null)
                {
                    buttonTest.Layout(left, top, (right - left) / 5, (bottom - top) / 5);
                }

                if (ll != null)
                {
                    ll.Layout(left, top, right, bottom);
                }


            }

            void UpdateUi()
            {
            }

        }
        public class TestFragment : Fragment
        {

            public static TestFragment newInstance(String text)
            {

                TestFragment f = new TestFragment();

                Bundle b = new Bundle();
                b.PutString("text", text);
                f.Arguments = b;
                return f;
            }

            // @Override
            public override Android.Views.View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
            {
                Android.Views.View v = inflater.Inflate(Resource.Layout.layout1, container, false);

                string val = Arguments.GetString("text");
                ((TextView)v.FindViewById(Resource.Id.tvFragText)).SetText(val.ToCharArray(), 0, val.Length);
                return v;
            }
        }


    }

还有AndroidView.xaml

    <?xml version="1.0" encoding="UTF-8"?>
    <ContentView xmlns="http://xamarin.com/schemas/2014/forms" 
                 xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                 xmlns:d="http://xamarin.com/schemas/2014/forms/design"
                 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                xmlns:androidWidget="clr-namespace:Android.Widget;assembly=Mono.Android;targetPlatform=Android"
                xmlns:formsandroid="clr-namespace:Xamarin.Forms;assembly=Xamarin.Forms.Platform.Android;targetPlatform=Android"
                xmlns:NativeFeatures="clr-namespace:NativeFeatures.Droid;assembly=NativeFeatures.Android;targetPlatform=Android" 
                 mc:Ignorable="d"
                 x:Class="NativeFeatures.AndroidView">
      <ContentView.Content>
          <StackLayout>
                <Label Text="Hello Xamarin.Forms Should just be Android Content!" />
                <NativeFeatures:TestNativeFragmentViewGroup/>
            </StackLayout>
      </ContentView.Content>

我错过什么了吗？

---

或者xamarin不以这种方式支持本机片段吗？

我不确定您为什么需要这里的片段？在XF中无法直接处理的特殊情况是什么，这使您选择了此路线，请添加更多类似的详细信息。我们可能会为您提供更好的解决方案！好的，最终目标是使用第三方片段，特别是heremapssdk。.aar文件的Xamarin绑定已成功。我可以通过将片段添加到Android项目的根视图中来获得屏幕上的地图控件。这是不令人满意的，因为（正如预期的那样）该片段掩盖了Xamarin库中传递的任何UI组件，或者如果我将Xamarin组件向前推（在其中一个布局上使用BringToFront（））然后，地图片段没有得到手势，因为它们被Xamarin项目UI吸收。应该澄清的是，现在地图提供了Android和iOS库，但没有直接支持Xamarin。您链接到的文章包括一个可下载的示例。您下载了该示例并成功构建和运行了吗？那么，为什么不将控制权传递给Android项目，即导航到Android，然后在完成本机操作后返回XF呢