/**
* @description recyclerview gridlayout 平分中间空白区域
*/
class UserGradeItemDecoration(val width:Int,val itemWidth: Int, val columns: Int,val topPadding:Int) : RecyclerView.ItemDecoration() {
override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
var position = parent.getChildAdapterPosition(view);
var totalCount = parent.adapter?.itemCount;
// 可以适配任意列数(只要放的下)
var w = (width - itemWidth * columns) / (columns * (columns-1));
var p = position % columns;
outRect.left = (w*p);
}
}