Question

我必须实现ViewPager来滑动DetailViewFragments来做我编写的适配器（使用https://github.com/Cheesebaron/ViewPagerIndicator）并且它工作正常，但在旋转期间，活动片段不会显示。然而，ViewPager在那里工作，甚至创建新的片段（在旋转之前没有创建的片段）。我浏览了这个网站，发现了一堆类似的未回答的问题，但因为MvvmCross使这个特殊，我决定试试你的运气。

查看

protected override void OnCreate(Bundle bundle)
{
    SetTheme(Resource.Style.Theme_ActionBar_Custom);
    base.OnCreate(bundle);
    SetContentView(Resource.Layout.TipListView);

    var models = _viewModel.SomeModelList;

    _viewPager = FindViewById<ViewPager>(Resource.Id.pager);
    _adapter = new MvxFragmentStatePagerAdapter<ViewModel, Model>
            (this, SupportFragmentManager, typeof(Fragment), models,
                ()=>FuncToBuildViewModel);

    _viewPager.Adapter = _adapter;

    var indicator = FindViewById<UnderlinePageIndicator>(Resource.Id.indicator);
    indicator.SetViewPager(_viewPager);
    indicator.Fades = false;

    if (bundle == null)
        _adapterPosition = models.GetPosition(firstModelToShow);
    else
        _adapterPosition = bundle.GetInt("adapterposition");

    _viewPager.CurrentItem = _adapterPosition;

    ...
}

适配器

public class MvxFragmentStatePagerAdapter<TViewModel, TModel> : FragmentStatePagerAdapter
where TViewModel : BaseViewModel<TModel>
where TModel : BaseModel, new()
{
   //introduction of constructor parameters

    public MvxFragmentStatePagerAdapter(Context context, FragmentManager fragmentManager, Type fragmentType, List<TModel> models, Func<TViewModel> vmCtor)
        : base(fragmentManager)
    {    //initialization of constructor parameters   }

    public override int Count { get { return _models.Count; } }

    public override Fragment GetItem(int position)
    {
        var fragment = Fragment.Instantiate(_context, FragmentJavaName(_fragmentType));
        ((MvxFragment)fragment).DataContext = BuildVM(position);
        return fragment;
    }

    protected virtual string FragmentJavaName(Type fragmentType)
    {
        var namespaceText = fragmentType.Namespace ?? string.Empty;
        if (namespaceText.Length > 0)
        {
            namespaceText = namespaceText.ToLowerInvariant() + ".";
        }
        return namespaceText + fragmentType.Name;
    }
....

片段

public class MyFrag : MvxFragment
{
    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        var ignored = base.OnCreateView(inflater, container, savedInstanceState);
        return this.BindingInflate(Resource.Layout.MyFrag, null);
    }
}

这里没有什么可复杂的，但在轮换后，我只得到背景和指示。

ViewPager不会在旋转时显示片段

0 个答案: