MvvmCross绑定到TextInputLayout的Error属性

我试图简化数据验证的一个活动，有大量的控件输入（约10）。每个控制的EditText具有独特的验证错误，所以我决定做与TextInputLayout小窗口批准支持。所以我的布局如下：MvvmCross绑定到TextInputLayout的Error属性

<android.support.design.widget.TextInputLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    app:errorEnabled="true" 
    local:MvxBind="Error PhoneNumberError"> 
    <android.support.design.widget.TextInputEditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     local:MvxBind="Text PhoneNumber" /> 
</android.support.design.widget.TextInputLayout>

为了实现这一目标，我创建了一个自定义绑定，很简单的一个：

public class TextInputLayoutErrorBinding : MvxAndroidTargetBinding 
{ 
    public const string TextInputLayoutErrorProperty = "Error"; 

    public TextInputLayoutErrorBinding(TextInputLayout view) 
     : base(view) 
    { 
    } 

    public override System.Type TargetType 
    { 
     get { return typeof(string); } 
    } 

    public override MvxBindingMode DefaultMode 
    { 
     get { return MvxBindingMode.OneWay; } 
    } 

    protected override void SetValueImpl(object target, object value) 
    { 
     var view = (TextInputLayout)target; 
     var error = (string)value; 
     if (view == null) 
      return; 

     view.Error = error; 
    } 
}

，并在我的Setup.FillTargetFactories

registry.RegisterCustomBindingFactory<TextInputLayout>(TextInputLayoutErrorBinding.TextInputLayoutErrorProperty, (layout) => new TextInputLayoutErrorBinding(layout));

它注册

不幸的是，当活动开始时，我的应用程序崩溃，并出现以下错误：

[mono-rt] Stacktrace: 
[mono-rt] 
[mono-rt] at <unknown> <0xffffffff> 
[mono-rt] at (wrapper managed-to-native) Java.Interop.NativeMethods.java_interop_jnienv_call_nonvirtual_object_method_a (intptr,intptr&,intptr,intptr,intptr,Java.Interop.JniArgumentValue*) <0x00057> 
[mono-rt] at Java.Interop.JniEnvironment/InstanceMethods.CallNonvirtualObjectMethod (Java.Interop.JniObjectReference,Java.Interop.JniObjectReference,Java.Interop.JniMethodInfo,Java.Interop.JniArgumentValue*) [0x00074] in <bd30a18775d94dc8b6263aecd1ca9077>:0 
[mono-rt] at Java.Interop.JniPeerMembers/JniInstanceMethods.InvokeVirtualObjectMethod (string,Java.Interop.IJavaPeerable,Java.Interop.JniArgumentValue*) [0x0005f] in <bd30a18775d94dc8b6263aecd1ca9077>:0 
[mono-rt] at Android.Views.LayoutInflater.Inflate (int,Android.Views.ViewGroup,bool) [0x00061] in <9ab9faae1b4b4f0da28e7c4ac61e2c78>:0 
[mono-rt] at MvvmCross.Binding.Droid.Views.MvxLayoutInflater.Inflate (int,Android.Views.ViewGroup,bool) [0x00042] in <6a0c851a22864d0993089d65320a630c>:0 
[mono-rt] at MvvmCross.Binding.Droid.BindingContext.MvxAndroidBindingContext.CommonInflate (int,Android.Views.ViewGroup,bool) [0x00015] in <6a0c851a22864d0993089d65320a630c>:0 
[mono-rt] at MvvmCross.Binding.Droid.BindingContext.MvxAndroidBindingContext.BindingInflate (int,Android.Views.ViewGroup,bool) [0x00004] in <6a0c851a22864d0993089d65320a630c>:0 
[mono-rt] at MvvmCross.Binding.Droid.BindingContext.MvxAndroidBindingContext.BindingInflate (int,Android.Views.ViewGroup) [0x00004] in <6a0c851a22864d0993089d65320a630c>:0 
[mono-rt] at MvvmCross.Binding.Droid.BindingContext.MvxBindingContextOwnerExtensions.BindingInflate (MvvmCross.Binding.BindingContext.IMvxBindingContextOwner,int,Android.Views.ViewGroup) [0x0000d] in <6a0c851a22864d0993089d65320a630c>:0 
[mono-rt] at MvvmCross.Droid.Support.V7.AppCompat.MvxAppCompatActivity.SetContentView (int) [0x00003] in <76c7f3cdfddd459898d814608e83832e>:0 
[mono-rt] at Android.Views.SignupView.OnCreate (Android.OS.Bundle) [0x00009] in Android/Views/SignupView.cs:17 
[mono-rt] at Android.Support.V4.App.FragmentActivity.n_OnCreate_Landroid_os_Bundle_ (intptr,intptr,intptr) [0x00013] in <6296d3d76c5d4378959a1d9bf7205023>:0 
[mono-rt] at (wrapper dynamic-method) object.47968830-2057-4cdb-aa78-9844556333c4 (intptr,intptr,intptr) [0x00017] in <3fd174ff54b146228c505f23cf75ce71>:0 
[mono-rt] at (wrapper native-to-managed) object.47968830-2057-4cdb-aa78-9844556333c4 (intptr,intptr,intptr) [0x00022] in <3fd174ff54b146228c505f23cf75ce71>:0

我能实现我的绑定验证错误目标或我必须做手工？

来源

2017-08-09 Alexey Strakh

事实证明Xamarin具有Error属性，即使没有任何自定义绑定，您也可以绑定它。就像这样：

local:MvxBind="Error PhoneNumberError"

来源

2017-08-09 05:51:17

MvvmCross绑定到TextInputLayout的Error属性

回答

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