MvvmCross片段解析 [英] MvvmCross fragments resolving

问题描述

我将Xamarin与MvvmCross一起使用，并且在片段使用方面遇到问题.

I'm using Xamarin with MvvmCross, and have problem with fragments usage.

我这样称呼ShowViewModel:

I call ShowViewModel so:

public class MainViewModel : MvxViewModel
{
    public override void Start()
    {
        ShowViewModel<MainMenuViewModel>();
    }
}

MainMenuViewModel所在的类:

Where MainMenuViewModel it's class:

public class MainMenuViewModel : MvxViewModel
{
}

实现的片段如下:

[MvxFragment(typeof(MainMenuViewModel), Resource.Id.navigation_frame)]
[Register("mvvm.droid.views.MainMenuView")]
public class MainMenuView : MvxFragment<MainMenuViewModel>
{
   public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
   {
      var ignore = base.OnCreateView(inflater, container, savedInstanceState);
      return this.BindingInflate(Resource.Layout.MainMenuView, null);
   }
}

但是在运行时会引发错误:

But on runtime it throws error:

Android.Content.ActivityNotFoundException:无法找到显式 活动课 {Mvvm.Droid/md5f67dcc55ddb5809d2766dd0c42c8b3bb.MainMenuView}; 您是否在AndroidManifest.xml中声明了此活动?

Android.Content.ActivityNotFoundException: Unable to find explicit activity class {Mvvm.Droid/md5f67dcc55ddb5809d2766dd0c42c8b3bb.MainMenuView}; have you declared this activity in your AndroidManifest.xml?

为了弄清楚这一点，我实现了CustomPresenter，取自

For figuring out this, i implemented CustomPresenter, taken from here.

然后在安装程序中注册了此演示者的片段:

And in Setup registered this presenter for fragments:

protected override IMvxAndroidViewPresenter CreateViewPresenter()
{
   var mvxFragmentsPresenter = new MvxCustomFragmentsPresenter(AndroidViewAssemblies);
   Mvx.RegisterSingleton<IMvxAndroidViewPresenter>(mvxFragmentsPresenter);
   return mvxFragmentsPresenter;
}

似乎主持人发现了片段，但在Show(Intent)方法调用中，它仍在崩溃.在反编译的源代码中，有一个奇怪的检查是否是活动. 尝试基于许多实现来实现抽屉布局，但是结果相同.我想念的是什么?

It seems like presenter found fragments, but at Show(Intent) method call it's still crushing. In decompiled sources there is a strange check if it's an activity. Tryed to implement drawerLayout based on many implementations, but the same result. What i'm missing?

推荐答案

问题出在您的MvxFragment属性中:

[MvxFragment(typeof( MainMenuViewModel )，Resource.Id.navigation_frame)]

[MvxFragment(typeof(MainMenuViewModel), Resource.Id.navigation_frame)]

第一个参数必须是与要放置菜单片段的Activity相关的MvxViewModel.在您的情况下，我相信这可能是MainViewModel?

The first parameter needs to be the MvxViewModel associated to your Activity that you want to place the menu fragment in. In your case I believe this may be MainViewModel?

Mvvmcross 描述

Mvvmcross description of MvxFragment attribute:

public MvxFragmentAttribute(
    Type parentActivityViewModelType, 
    int fragmentContentId, 
    bool addToBackStack = false); 

这篇关于MvvmCross片段解析的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！