[feat] : #16 마시멜로 itemDecoration 추가

app/src/main/java/com/teampome/pome/presentation/mypage/GridSpaceItemDecoration.kt

@@ -0,0 +1,33 @@
+package com.teampome.pome.presentation.mypage
+
+import android.content.Context
+import android.graphics.Rect
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+
+class GridSpaceItemDecoration(private val spanCount: Int): RecyclerView.ItemDecoration() {
+    // 3, 20
+    override fun getItemOffsets(
+        outRect: Rect,
+        view: View,
+        parent: RecyclerView,
+        state: RecyclerView.State
+    ) {
+        val position = parent.getChildAdapterPosition(view)
+
+        val column = position % spanCount
+
+        val spaceInPx = dpToPx(parent.context, 5)
+
+        if (column == 0) {
+            outRect.right = spaceInPx
+        } else if (column == 1) {
+            outRect.left = spaceInPx
+        }
+    }
+
+    private fun dpToPx(context: Context, dp: Int): Int {
+        val density = context.resources.displayMetrics.density
+        return (dp * density + 0.5f).toInt()
+    }
+}

app/src/main/java/com/teampome/pome/presentation/mypage/MyPageFragment.kt

@@ -74,6 +74,8 @@ class MyPageFragment : BaseFragment<FragmentMypageBinding>(R.layout.fragment_myp
 //            setHasFixedSize(true)
             layoutManager = manager
             adapter = marshmelloAdapter
+            addItemDecoration(GridSpaceItemDecoration(2))
         }
+
     }
 }