Kotlin] 안드로이드 Recyclerview 아이템 폭 & 간격 & 구분선 표시

구분선 넣기 

// 구분선 넣기
val dividerItemDecoration =
    DividerItemDecoration(recyclerView.context, LinearLayoutManager(this).orientation)

recyclerView.addItemDecoration(dividerItemDecoration)

 

아이템 간격(폭) 조절

class MyAdapter(private var datas: ArrayList<String>) : RecyclerView.Adapter<MyViewHolder>() {

	override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
    	...
     	return MyViewHolder(view)
     }

     ....

     override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
           ...
         // 간격 설정
         val layoutParams = holder.itemView.layoutParams
         layoutParams.height = 100
         holder.itemView.requestLayout()
      }
}

 

 

 

 

아이템간 간격 조절

How to add dividers and spaces between items in RecyclerView?

// 간격 20으로 
val spaceDecoration = VerticalSpaceItemDecoration(20)
recyclerView.addItemDecoration(spaceDecoration)
...

inner class VerticalSpaceItemDecoration(private val verticalSpaceHeight: Int) :
    RecyclerView.ItemDecoration() {

    override fun getItemOffsets(
        outRect: Rect, view: View, parent: RecyclerView,
        state: RecyclerView.State
     ) {
        outRect.bottom = verticalSpaceHeight
     }
}