我想要做的是在一个网格中显示多个项目的简单屏幕。这可以在 android 上使用 GridView 轻松存档。
在 MvvmCross 我想我必须使用 MvxGridView 来存档。
这是我的 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>
项目视图：
<?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>
我的视图模型：
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; }
}
}
当我运行这个例子时会发生什么：
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)
我做错了什么？我正在使用可以从 Nuget 获得的最新内容。在 VS2012 中运行 Mono Android 4.6.4
这是带有完整代码的仓库： https ://github.com/sschoeb/MvvmCrossGridViewProblem