MainActivity.kt

 mRecyclerView.layoutManager = LinearLayoutManager(this)

        mRecyclerView.addItemDecoration(SimpleDividerItemDecoration(this))
        // specify an adapter (see also next example)
        mRecyclerView.adapter = MovieAdapter(applicationContext,Utils.getMovies())

    }

    // choose the layout between Linear and Grid
    fun typeLayout(view: View){
        when(layout){
            "list"-> {
                Utils.toast(applicationContext,"grid", Toast.LENGTH_SHORT)
                imageViewType.setImageResource(R.drawable.list)
                mRecyclerView.layoutManager= GridLayoutManager(this, spanCount)
                layout="grid"
            }
            "grid"->{
                Utils.toast(applicationContext,"list", Toast.LENGTH_SHORT)
                imageViewType.setImageResource(R.drawable.grid)
                mRecyclerView.layoutManager = LinearLayoutManager(this)
                layout="list"
            }

        }
    }