将Visual as Material设置为Xamarin时无法获取Android本机元素。XF 5.0.0.2012中的表单条目控件 描述

当我们为条目设置材质设计时，我们无法在android中获取本机元素

如果没有材料设计，我们可以获得原生文本

XF中的：4.8.0.1687。这很好用

XAML

 <local:CustomView >
                <local:CustomView.Input>
                    <Entry Visual="Material"/>
                </local:CustomView.Input>
            </local:CustomView>

Android渲染器

...

[assembly: Forms.ExportRenderer(typeof(CustomView), typeof(CustomViewRenderer))]
namespace XF5Sample.Droid
{
    public class CustomViewRenderer : ViewRenderer<CustomView, View>
    {
        private CustomView customView;

        public CustomViewRenderer(global::Android.Content.Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<CustomView> e)
        {
            base.OnElementChanged(e);

            var element = e.NewElement;
            customView = element as CustomView;
        }

        protected override void OnAttachedToWindow()
        {
            base.OnAttachedToWindow();

            if (Platform.GetRenderer(customView.Input) == null)
            {
                Platform.SetRenderer(customView.Input, Platform.CreateRendererWithContext(customView.Input, Context));
            }

            var renderer = Platform.GetRenderer(customView.Input);

            if (renderer != null)
            {
                var nativeEditText = GetNativeEditText(renderer as ViewGroup);

                if (nativeEditText != null && nativeEditText.Handle != IntPtr.Zero)
                {

                }
            }
        }

        internal static EditText GetNativeEditText(ViewGroup viewGroup)
        {
            EditText editText = null;
            if (editText == null && viewGroup is ViewGroup)
            {
                var childCount = viewGroup.ChildCount;
                for (int i = 0; i < childCount; i++)
                {
                    var child = viewGroup.GetChildAt(i);
                    if (child is EditText)
                    {
                        editText = child as EditText;
                    }
                    else if (child is ViewGroup)
                    {
                        editText = GetNativeEditText(child as ViewGroup);
                    }
                    else
                    {
                        return editText;
                    }

                    if (editText != null)
                    {
                        break;
                    }
                }
            }

            return editText;
        }
    }
}

请参见GetNativeEditText在可视为材质时返回空值

预期行为 必须在材料设计中返回本机元素

实际行为 在物料设计中返回空值

基本信息

• Xamarin.表格：5.0.0.2012
• Xamarin.Forms.Visual.Material:5.0.0.2012

样品

当设置

Visual=“Material”

作为输入时，我得到

Google.Android.Material.TextField.TextInputLayout

，而foreach

TextInputLayout

，看不到

EditText

。

...

[assembly: Forms.ExportRenderer(typeof(CustomView), typeof(CustomViewRenderer))]
namespace XF5Sample.Droid
{
    public class CustomViewRenderer : ViewRenderer<CustomView, View>
    {
        private CustomView customView;

        public CustomViewRenderer(global::Android.Content.Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<CustomView> e)
        {
            base.OnElementChanged(e);

            var element = e.NewElement;
            customView = element as CustomView;
        }

        protected override void OnAttachedToWindow()
        {
            base.OnAttachedToWindow();

            if (Platform.GetRenderer(customView.Input) == null)
            {
                Platform.SetRenderer(customView.Input, Platform.CreateRendererWithContext(customView.Input, Context));
            }

            var renderer = Platform.GetRenderer(customView.Input);

            if (renderer != null)
            {
                var nativeEditText = GetNativeEditText(renderer as ViewGroup);

                if (nativeEditText != null && nativeEditText.Handle != IntPtr.Zero)
                {

                }
            }
        }

        internal static EditText GetNativeEditText(ViewGroup viewGroup)
        {
            EditText editText = null;
            if (editText == null && viewGroup is ViewGroup)
            {
                var childCount = viewGroup.ChildCount;
                for (int i = 0; i < childCount; i++)
                {
                    var child = viewGroup.GetChildAt(i);
                    if (child is EditText)
                    {
                        editText = child as EditText;
                    }
                    else if (child is ViewGroup)
                    {
                        editText = GetNativeEditText(child as ViewGroup);
                    }
                    else
                    {
                        return editText;
                    }

                    if (editText != null)
                    {
                        break;
                    }
                }
            }

            return editText;
        }
    }
}

 if (renderer != null)
            {
                var nativeEditText = GetNativeEditText(renderer as ViewGroup);

                if (nativeEditText != null && nativeEditText.Handle != IntPtr.Zero)
               **Here** {

                }
            }