snap last item with ItemDecoration

[imunique-ZJ]

snap last item with ItemDecoration

[imunique-ZJ]

Hooray!! It works!!

[TakuSemba]

Thank you for reporting. I will take a look.

[imunique-ZJ]

By the way, I use a custom LayoutManager and a custom ItemDecorator to achieve center focusing like the image above. After expand 1 more pixel for width in ItemDecoration, v2.0.1 will focus the last item as expected.

class CenteredItemDecoration: RecyclerView.ItemDecoration() {

    override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
        // default offsets
        outRect.left = 0
        outRect.top = 0
        outRect.right = 0
        outRect.bottom = 0

        val itemWidth = view.resources.displayMetrics.widthPixels / 5
        view.updateLayoutParams<ViewGroup.LayoutParams> { width = itemWidth }

        val additionalOffset = view.resources.displayMetrics.widthPixels / 2 - itemWidth / 2
        when (parent.getChildAdapterPosition(view)) {
            0 -> outRect.left = additionalOffset
            (parent.layoutManager?.itemCount ?: 0) - 1 -> outRect.right = additionalOffset // +1 here will make v2.0.1 focus  last item
        }
    }
}

[imunique-ZJ]

Hi, any updates here?

[TakuSemba]

Sorry for the late reply.
Unfortunately, I could not reproduce it on my own.
Can you reproduce it on sample app in this repo?

[imunique-ZJ]

Hi, I tried the Horizontal RecyclerView of the sample app and change the first sample to 3 items and set msrv_gravity="center", msrv_interval="1" and added the CenteredItemDecoration I provided above, it worked as expected. However, if I remove the margin of the list item, it will fail to focus the last item.

item_horizontal.xml
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:orientation="horizontal"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginLeft="8dp" <!---- remove margin ---->
  android:layout_marginRight="8dp" <!---- remove margin ---->
  app:cardUseCompatPadding="true"
  >
    ...
</androidx.cardview.widget.CardView >

If I commented out the line

view.updateLayoutParams<ViewGroup.LayoutParams> { width = itemWidth }

it will focus the last item but not at the center of the item.

[TakuSemba]

Thank you for the information, I will try to look into it.

[TakuSemba]

I fixed it at the version of 2.0.2. 👍 Could you check if it does not happen?