Created
October 21, 2021 04:05
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Equal Spacing for items in GridLayoutManager
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import android.graphics.Rect | |
import android.view.View | |
import androidx.recyclerview.widget.RecyclerView | |
import androidx.recyclerview.widget.RecyclerView.ItemDecoration | |
class GridSpacingItemDecoration( | |
private val spanCount: Int, | |
private val spacing: Int, | |
private val includeEdge: Boolean | |
) : ItemDecoration() { | |
override fun getItemOffsets( | |
outRect: Rect, | |
view: View, | |
parent: RecyclerView, | |
state: RecyclerView.State | |
) { | |
val position = parent.getChildAdapterPosition(view) // item position | |
val column = position % spanCount // item column | |
if (includeEdge) { | |
outRect.left = | |
spacing - column * spacing / spanCount // spacing - column * ((1f / spanCount) * spacing) | |
outRect.right = | |
(column + 1) * spacing / spanCount // (column + 1) * ((1f / spanCount) * spacing) | |
if (position < spanCount) { // top edge | |
outRect.top = spacing | |
} | |
outRect.bottom = spacing // item bottom | |
} else { | |
outRect.left = column * spacing / spanCount // column * ((1f / spanCount) * spacing) | |
outRect.right = | |
spacing - (column + 1) * spacing / spanCount // spacing - (column + 1) * ((1f / spanCount) * spacing) | |
if (position >= spanCount) { | |
outRect.top = spacing // item top | |
} | |
} | |
} | |
} |
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