在MvvmCross中使用MvxGridView

我想要做的是簡單的屏幕顯示網格中的多個項目。這可以在android上使用GridView輕鬆歸檔。在MvvmCross中使用MvxGridView

在MvvmCross我想我必須使用MvxGridView存檔相同。

這裏是我的axml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:local="http://schemas.android.com/apk/res-auto" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <Mvx.MvxGridView 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    local:MvxBind="ItemsSource Items" 
    local:MvxItemTemplate="@layout/itemview" /> 
</LinearLayout>

的ItemView控件：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:local="http://schemas.android.com/apk/res-auto" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:minWidth="25px" 
    android:minHeight="25px"> 
    <TextView 
     android:text="Text" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView1" 
     local:MvxBind="Text Name" /> 
</LinearLayout>

我的視圖模型：

using System.Collections.ObjectModel; 
using Cirrious.MvvmCross.ViewModels; 

namespace GridViewBug.Core.ViewModels 
{ 
    public class FirstViewModel 
     : MvxViewModel 
    { 
     public FirstViewModel() 
     { 
      Items = new ObservableCollection<TestClass>(); 
      Items.Add(new TestClass { Name = "Test1" }); 
      Items.Add(new TestClass { Name = "Test2" }); 
     } 

     private string _hello = "Hello MvvmCross"; 
     public string Hello 
     { 
      get { return _hello; } 
      set { _hello = value; RaisePropertyChanged(() => Hello); } 
     } 

     public ObservableCollection<TestClass> Items { get; set; } 
    } 

    public class TestClass 
    { 
     public string Name { get; set; } 
    } 
}

在這裏，當我運行這個例子會發生什麼：

05-03 16:18:32.799 I/MvxBind (7960): 0.84 Problem seen during binding execution for from Items to ItemsSource - problem TargetInvocationException: Exception has been thrown by the target of an invocation. 
05-03 16:18:32.799 I/MvxBind (7960):  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at System.Reflection.MonoProperty.SetValue (System.Object obj, System.Object value, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] index, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at System.Reflection.PropertyInfo.SetValue (System.Object obj, System.Object value, System.Object[] index) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Bindings.Target.MvxPropertyInfoTargetBinding.SetValue (System.Object value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Bindings.MvxFullBinding.UpdateTargetFromSource (Boolean isAvailable, System.Object value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): InnerException was UnsupportedOperationException: Exception of type 'Java.Lang.UnsupportedOperationException' was thrown. 
05-03 16:18:32.799 I/MvxBind (7960):  at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (IntPtr jobject, IntPtr jclass, IntPtr jmethod) [0x00023] in /Users/builder/data/lanes/monodroid-lion-bs1/03814ac5/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:604 
05-03 16:18:32.799 I/MvxBind (7960): at Android.Views.ViewGroup.RemoveAllViews() [0x00053] in /Users/builder/data/lanes/monodroid-lion-bs1/03814ac5/source/monodroid/src/Mono.Android/platforms/android-8/src/generated/Android.Views.ViewGroup.cs:2582 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxViewGroupExtensions.Refill (Android.Views.ViewGroup viewGroup, IAdapter adapter) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxViewGroupExtensions.UpdateDataSetFromChange[MvxGridView] (Cirrious.MvvmCross.Binding.Droid.Views.MvxGridView viewGroup, System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs eventArgs) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxGridView.AdapterOnDataSetChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs eventArgs) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at (wrapper delegate-invoke) <Module>:invoke_void__this___object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs) 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapterWithChangedEvent.NotifyDataSetChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapterWithChangedEvent.NotifyDataSetChanged() [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapter.SetItemsSource (IEnumerable value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapter.set_ItemsSource (IEnumerable value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxGridView.set_ItemsSource (IEnumerable value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) 
05-03 16:18:32.799 I/MvxBind (7960): at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/MvxBind (7960): --- End of managed exception stack trace --- 
05-03 16:18:32.799 I/MvxBind (7960): java.lang.UnsupportedOperationException: removeAllViews() is not supported in AdapterView 
05-03 16:18:32.799 I/MvxBind (7960): at android.widget.AdapterView.removeAllViews(AdapterView.java:521) 
05-03 16:18:32.799 I/MvxBind (7960): at cirrious.mvvmcross.binding.droid.binders.MvxBindingLayoutInflatorFactory.n_onCreateView(Native Method) 
05-03 16:18:32.799 I/MvxBind (7960): at cirrious.mvvmcross.binding.droid.binders.MvxBindingLayoutInflatorFactory.onCreateView(MvxBindingLayoutInflatorFactory.java:29) 
05-03 16:18:32.799 I/MvxBind (7960): at android.view.LayoutInflater.createViewFromTag(Layo 
05-03 16:18:32.799 I/mono-stdout(7960): MvxBind:Error: 0.84 Problem seen during binding execution for from Items to ItemsSource - problem TargetInvocationException: Exception has been thrown by the target of an invocation. 
05-03 16:18:32.799 I/mono-stdout(7960):  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/mono-stdout(7960): at System.Reflection.MonoProperty.SetValue (System.Object obj, System.Object value, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] index, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/mono-stdout(7960): at System.Reflection.PropertyInfo.SetValue (System.Object obj, System.Object value, System.Object[] index) [0x00000] in <filename unknown>:0 
05-03 16:18:32.799 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Bindings.Target.MvxPropertyInfoTargetBinding.SetValue (System.Object value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Bindings.MvxFullBinding.UpdateTargetFromSource (Boolean isAvailable, System.Object value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): InnerException was UnsupportedOperationException: Exception of type 'Java.Lang.UnsupportedOperationException' was thrown. 
05-03 16:18:32.809 I/mono-stdout(7960):  at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (IntPtr jobject, IntPtr jclass, IntPtr jmethod) [0x00023] in /Users/builder/data/lanes/monodroid-lion-bs1/03814ac5/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:604 
05-03 16:18:32.809 I/mono-stdout(7960): at Android.Views.ViewGroup.RemoveAllViews() [0x00053] in /Users/builder/data/lanes/monodroid-lion-bs1/03814ac5/source/monodroid/src/Mono.Android/platforms/android-8/src/generated/Android.Views.ViewGroup.cs:2582 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxViewGroupExtensions.Refill (Android.Views.ViewGroup viewGroup, IAdapter adapter) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxViewGroupExtensions.UpdateDataSetFromChange[MvxGridView] (Cirrious.MvvmCross.Binding.Droid.Views.MvxGridView viewGroup, System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs eventArgs) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxGridView.AdapterOnDataSetChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs eventArgs) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at (wrapper delegate-invoke) <Module>:invoke_void__this___object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs) 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapterWithChangedEvent.NotifyDataSetChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapterWithChangedEvent.NotifyDataSetChanged() [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapter.SetItemsSource (IEnumerable value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxAdapter.set_ItemsSource (IEnumerable value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at Cirrious.MvvmCross.Binding.Droid.Views.MvxGridView.set_ItemsSource (IEnumerable value) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) 
05-03 16:18:32.809 I/mono-stdout(7960): at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
05-03 16:18:32.809 I/mono-stdout(7960): --- End of managed exception stack trace --- 
05-03 16:18:32.809 I/mono-stdout(7960): java.lang.UnsupportedOperationException: removeAllViews() is not supported in AdapterView 
05-03 16:18:32.809 I/mono-stdout(7960): at android.widget.AdapterView.removeAllViews(AdapterView.java:521) 
05-03 16:18:32.809 I/mono-stdout(7960): at cirrious.mvvmcross.binding.droid.binders.MvxBindingLayoutInflatorFactory.n_onCreateView(Native Method) 
05-03 16:18:32.809 I/mono-stdout(7960): at cirrious.mvvmcross.binding.droid.binders.MvxBindingLayoutInflatorFactory.onCreateView(MvxBindingLayoutInflatorFactory.java:29) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.view.LayoutInflater.rInflate(LayoutInflater.java:739) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
05-03 16:18:32.809 I/mono-stdout(7960): at gridviewbug.droid.views.FirstView.n_onCreate(Native Method) 
05-03 16:18:32.809 I/mono-stdout(7960): at gridviewbug.droid.views.FirstView.onCreate(FirstView.java:28) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.Activity.performCreate(Activity.java:4465) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.ActivityThread.access$600(ActivityThread.java:123) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.os.Looper.loop(Looper.java:137) 
05-03 16:18:32.809 I/mono-stdout(7960): at android.app.ActivityThread.main(ActivityThread.java:4424) 
05-03 16:18:32.809 I/mono-stdout(7960): at java.lang.reflect.Method.invokeNative(Native Method) 
05-03 16:18:32.809 I/mono-stdout(7960): at java.lang.reflect.Method.invoke(Method.java:511) 
05-03 16:18:32.809 I/mono-stdout(7960): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
05-03 16:18:32.809 I/mono-stdout(7960): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
05-03 16:18:32.809 I/mono-stdout(7960): at dalvik.system.NativeStart.main(Native Method)

我做錯了什麼？我正在使用我可以從Nuget獲得的最新內容。在VS2012

這裏運行於Android的單4.6.4是完整的代碼回購： https://github.com/sschoeb/MvvmCrossGridViewProblem

來源

2013-05-03 Stefan

從它看起來像一個直截了當的bug tracem，可能是某處發生在固定的另一個問題迴歸。

最好的辦法是在GitHub上打開這個問題 - https://github.com/slodge/MvvmCross/issues/new？或者你可以將源代碼分解並將其修復到你的分支中。

在此期間，也許嘗試使用MvxListView？或者創建一個新的可綁定ViewGroup？

來源

2013-05-03 17:44:03 Stuart

好的，謝謝，將去修復並創建一個拉請求。 – Stefan 2013-05-04 07:03:28

嗨Stefan。我認爲你是對的（我錯了），一般的解決方法是將'MvxGridView'放在'MvxListView'模板上，而不是'MvxLinearLayout'上。我昨天感到困惑，因爲我的快速測試在'MvxLinearLayout'中也顯示了一個錯誤 - 但我認爲這只是Xamarin.Android無法更新部署版本的代碼：/固定版本是https://gist.github.com/slodge/5518288 - 但在nuget部署中需要幾天的時間才能完成（QA的其他更改） – Stuart 2013-05-04 18:23:46

在MvvmCross中使用MvxGridView

回答

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