MvvmCross 绑定到 TextInputLayout 的错误 属性
MvvmCross binding to Error property of the TextInputLayout
我正在尝试简化一个 activity 的数据验证，它有很多控件需要输入（大约 10 个）。每个 edittext 控件都有一个独特的验证错误，所以我决定使用 TextInputLayout 支持的小部件验证。所以我的布局如下：
<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>
为了实现这一点，我创建了一个自定义绑定，非常简单：
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
注册
registry.RegisterCustomBindingFactory<TextInputLayout>(TextInputLayoutErrorBinding.TextInputLayoutErrorProperty, (layout) => new TextInputLayoutErrorBinding(layout));
不幸的是，当 activity 启动时，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
我可以通过绑定到验证错误来实现我的目标还是必须手动完成？
我发现 Xamarin 有错误 属性，即使没有任何自定义绑定，您也可以绑定到它。就像这样：
local:MvxBind="Error PhoneNumberError"
我正在尝试简化一个 activity 的数据验证，它有很多控件需要输入（大约 10 个）。每个 edittext 控件都有一个独特的验证错误，所以我决定使用 TextInputLayout 支持的小部件验证。所以我的布局如下：
<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>
为了实现这一点，我创建了一个自定义绑定，非常简单：
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));
不幸的是，当 activity 启动时，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
我可以通过绑定到验证错误来实现我的目标还是必须手动完成？
我发现 Xamarin 有错误 属性，即使没有任何自定义绑定，您也可以绑定到它。就像这样：
local:MvxBind="Error PhoneNumberError"