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Xamarin.Forms中的Droid Custom Picker Renderer错误

[英]Error with Droid Custom Picker Renderer in Xamarin.Forms

 原文  2017-06-20 19:37:52  5   2    c#/ xamarin/ xamarin.android/ xamarin.forms/ custom-renderer

问题描述

I've created a Custom Picker Renderer in my Xamarin.Forms application, on IOS it works fine but it crashes when I run Android. 我已经在Xamarin.Forms应用程序中创建了一个Custom Picker Renderer，在IOS上可以正常运行，但是在运行Android时崩溃。

I've already updated Visual Studio 2017 and I'am running Xamarin.Forms 2.3.4.247. 我已经更新了Visual Studio 2017，并且正在运行Xamarin.Forms 2.3.4.247。

Target Android Version is set to 7.1 (same error on 6.0) Minimum Android Version is set to 4.3 目标Android版本设置为7.1（6.0上出现相同错误）最低Android版本设置为4.3

Custom Picker: 自定义选择器： 

using System;
    using Xamarin.Forms;

    namespace Attest.Combustivel.Infra.Application.Controls
    {
        public class CustomPicker : Picker
        {
            public static readonly BindableProperty FontSizeProperty = BindableProperty.Create(p => p.FontSize, 22);

            public Double FontSize
            {
                get { return (double)GetValue(FontSizeProperty); }
                set
                {
                    if (this.FontSize != value)
                    {
                        SetValue(FontSizeProperty, value);
                    }
                }
            }
        }
    }

Custom Droid Picker Renderer - With Error: 自定义Droid Picker渲染器-出现错误： 

using Xamarin.Forms;
    using Xamarin.Forms.Platform.Android;

    [assembly: ExportRenderer(typeof(Attest.Combustivel.Infra.Application.Controls.CustomPicker), typeof(Attest.Combustivel.Target.Droid.Renderers.DroidCustomPickerRenderer))]
    namespace Attest.Combustivel.Target.Droid.Renderers
    {
        public class DroidCustomPickerRenderer : PickerRenderer
        {
            protected override void OnElementChanged(ElementChangedEventArgs e)
            {
                base.OnElementChanged(e);

                //if (Control == null)
                //{
                //    return;
                //}

                //var customPicker = e.NewElement as CustomPicker;

                //if (customPicker != null)
                //{
                //    Control.TextSize = Convert.ToSingle(customPicker.FontSize);
                //}
            }
        }
    }

Custom IOS Picker Renderer - Works Fine: 自定义IOS Picker渲染器-工作正常： 

using Attest.Combustivel.Infra.Application.Controls;
    using CoreGraphics;
    using System;
    using UIKit;
    using Xamarin.Forms;
    using Xamarin.Forms.Platform.iOS;

    [assembly: ExportRenderer(typeof(Attest.Combustivel.Infra.Application.Controls.CustomPicker), typeof(Attest.Combustivel.Target.Droid.Renderers.IOSCustomPickerRenderer))]
    namespace Attest.Combustivel.Target.Droid.Renderers
    {
        public class IOSCustomPickerRenderer : PickerRenderer
        {
            protected override void OnElementChanged(ElementChangedEventArgs e)
            {
                base.OnElementChanged(e);

                if (Control == null)
                {
                    return;
                }

                var customPicker = e.NewElement as CustomPicker;

                // FontSize
                if (customPicker?.FontSize != null)
                {
                    Control.Font = UIFont.FromName(".SF UI Text", Convert.ToSingle(customPicker.FontSize));
                }
            }
        }
    }

The Error: 错误： 

06-20 16:15:02.261 W/art     ( 7541): JNI RegisterNativeMethods: attempt to register 0 native methods for md5b60ffeb829f638581ab2bb9b1a7f4f3f.TableViewRenderer
06-20 16:15:02.261 W/art     ( 7541): JNI RegisterNativeMethods: attempt to register 0 native methods for md5718175f0eae2ce5b6bb8ba01f33420ae.DroidCustomTableViewRenderer
06-20 16:15:04.911 D/Mono    ( 7541): DllImport attempting to load: '/system/lib/liblog.so'.
06-20 16:15:04.911 D/Mono    ( 7541): DllImport loaded library '/system/lib/liblog.so'.
06-20 16:15:04.911 D/Mono    ( 7541): DllImport searching in: '/system/lib/liblog.so' ('/system/lib/liblog.so').
06-20 16:15:04.911 D/Mono    ( 7541): Searching for '__android_log_print'.
06-20 16:15:04.911 D/Mono    ( 7541): Probing '__android_log_print'.
06-20 16:15:04.911 D/Mono    ( 7541): Found as '__android_log_print'.
06-20 16:15:04.921 I/MonoDroid( 7541): UNHANDLED EXCEPTION:
06-20 16:15:04.981 I/MonoDroid( 7541): System.ArgumentException: element is not of type Xamarin.Forms.TableView
06-20 16:15:04.981 I/MonoDroid( 7541): Parameter name: element
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00008] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:135 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Platform.cs:289 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x00023] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:84 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:217 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:68 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:335 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00111] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:199 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:137 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Platform.cs:289 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x00023] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:84 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:217 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:68 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:335 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00111] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:199 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:137 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Platform.cs:289 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x00023] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:84 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:217 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:68 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:335 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00111] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:199 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:137 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Support.V4.App.FragmentManager fragmentManager) [0x00031] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Platform.cs:325 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Xamarin.Forms.Platform.Android.AppCompat.FragmentContainer.OnCreateView (Android.Views.LayoutInflater inflater, Android.Views.ViewGroup container, Android.OS.Bundle savedInstanceState) [0x00008] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\AppCompat\FragmentContainer.cs:67 
06-20 16:15:04.981 I/MonoDroid( 7541):   at Android.Support.V4.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_inflater, System.IntPtr native_container, System.IntPtr native_savedInstanceState) [0x00022] in <27c17fe440cf491ba8255bcefade6e02>:0 
06-20 16:15:04.981 I/MonoDroid( 7541):   at (wrapper dynamic-method) System.Object:63a8a4b1-f4fe-4a75-89d0-ed93d90f2880 (intptr,intptr,intptr,intptr,intptr)

Visual Studio 2017和Xamarin.Forms版本 Android目标和最低版本

2 个解决方案

解决方案1
 2 已采纳  2017-06-21 00:48:57

我们从异常中发现，同一种类型的渲染器更多。

解决方案2
 1  2017-06-20 21:55:31

Try changing your override method for OnElementChanged to something like this: 尝试将OnElementChanged的替代方法更改为以下OnElementChanged ： 

protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Picker> e)
{
    base.OnElementChanged(e);

    if (Control == null)
    {
        return;
    }

    var customPicker = e.NewElement as CustomPicker;

    if (customPicker != null)
    {
        Control.TextSize = Convert.ToSingle(customPicker.FontSize);
    }
}

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