RecyclerView State Sync Skeleton

RecyclerViewStateSyncSkeleton.kt

// Horizontle RecyclerView
val horizontalRecyclerView: RecyclerView = findViewById(R.id.horizontal_recycler_view)
val horizontalLayoutManager: LinearLayoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
horizontalRecyclerView.layoutManager = horizontalLayoutManager

// Vertical RecyclerView
val verticalRecyclerView: RecyclerView = findViewById(R.id.vertical_recycler_view)
val verticalLayoutManager: LinearLayoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
verticalRecyclerView.layoutManager = verticalLayoutManager

// ... When vertical list starts to render
// Transfer scroll position from horizontal list to vertical one
val horizontalScrollPosition = horizontalLayoutManager.findFirstVisibleItemPosition()
verticalRecyclerView.scrollToPosition(horizontalScrollPosition)

// ... When horizontal list starts to render
// Transfer scroll postion from vertical list to horizontal one
val verticalScrollPosition = verticalLayoutManager.findFirstVisibleItemPosition()
horizontalRecyclerView.scrollToPosition(verticalScrollPosition)