Question

我正在尝试使用MvxRecyclerView。我直接从ViewModel绑定了ItemSource并将其列入了列表。但我希望ListItemDivider介于两者之间。所以我制作了一个自定义的ItemDecorator并将其与循环器视图一起使用。它适用于andorid 7.0，但不适用于棉花糖。我没有为MvxRecyclerView分别使用任何Holder，LinearLayoutManager或Adapter。请在下面找到代码

活动类 // ********* **************************** //

[Activity(Label = "EmployeeHub", Theme = "@style/MaterialTheme", ScreenOrientation = AndroidSystem.Content.PM.ScreenOrientation.Portrait)]
public class EmployeeHub : BaseView
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        SetContentView(Resource.Layout.EmployeeHub);
        var reclycleView = this.FindViewById<MvxRecyclerView>(Resource.Id.my_recycler_view);
        AndroidSystem.Support.V7.Widget.RecyclerView.ItemDecoration dividerItemDecoration = new DividerItemDecoration(this.ApplicationContext);
        reclycleView.AddItemDecoration(dividerItemDecoration);
    }
}

ItemDecorator // ********* ******************** //

public class DividerItemDecoration : RecyclerView.ItemDecoration
{
    private AndroidSystem.Graphics.Drawables.Drawable divider;
    private int[] attributes = new int[] {Attribute.ListDivider };

    public DividerItemDecoration(Context context)
    {
        divider = context.GetDrawable(Resource.Drawable.noBorder);
        TypedArray ta = context.ObtainStyledAttributes(attributes);
        divider = ta.GetDrawable(0);
        ta.Recycle();
    }

    public override void GetItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state)
    {
        if (parent.GetChildAdapterPosition(view) == 0)
        {
            return;
        }

        outRect.Top = divider.IntrinsicHeight;
    }

    public override void OnDraw(Canvas c, RecyclerView parent, RecyclerView.State state)
    {
        int left = parent.PaddingLeft;
        int right = parent.Width - parent.PaddingRight;

        for (int i = 0; i < parent.ChildCount; i++)
        {
            View child = parent.GetChildAt(i);

            var parameters = child.LayoutParameters.JavaCast<RecyclerView.LayoutParams>();

            int top = child.Bottom + parameters.BottomMargin;
            int bottom = top + divider.IntrinsicHeight;

            divider.SetBounds(left, top, right, bottom);
            divider.Draw(c);
        }
    }
}

//布局******************************************** ** //

 <MvxRecyclerView
    android:id="@+id/my_recycler_view"
    android:layout_below="@+id/hlhrview1"
    android:scrollbars="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    local:MvxItemTemplate="@layout/employee_item_template"
    local:MvxBind="ItemsSource Employees; ItemClick SelectedEmployee" />

Answer 1

我也遇到了问题。通过here的提示和对代码的一些修改，我能够使其正常运行。具体来说，我使用 OnDrawOver 而不是 OnDraw

这是我修改过的DividerItemDecoration：

public class DividerItemDecoration : RecyclerView.ItemDecoration
{
    private readonly Drawable _divider;

    public DividerItemDecoration(Context context)
    {

        _divider = ResourcesCompat.GetDrawable(context.Resources, Resource.Drawable.recyclerview_line_divider, context.Theme);
    }

    public override void OnDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
    {
        var left = parent.PaddingLeft;
        var right = parent.Width - parent.PaddingRight;

        for (var i = 0; i < parent.ChildCount; i++)
        {
            var child = parent.GetChildAt(i);

            var parameters = child.LayoutParameters.JavaCast<RecyclerView.LayoutParams>();

            var top = child.Bottom + parameters.BottomMargin;
            var bottom = top + _divider.IntrinsicHeight;

            _divider.SetBounds(left, top, right, bottom);
            _divider.Draw(c);
        }
    }
}

我还将绑定代码放在我的OnCreateView中，如下所示：

var reclycleView = _payformView.FindViewById<MvxRecyclerView>(Resource.Id.my_recycler_view);
RecyclerView.ItemDecoration dividerItemDecoration = new DividerItemDecoration(Application.Context);
reclycleView.AddItemDecoration(dividerItemDecoration);

所有这些都在 KitKat 设备上。

MvxRecyclerView ItemDecoration无法在Marshmallow中运行

1 个答案: