Creating Android Native SearchView in ActionBar

gistfile1.txt

     override fun onCreateOptionsMenu(menu: Menu): Boolean {
        val searchItem: MenuItem? = menu.findItem(R.id.action_search)
        if (searchItem != null) {
            searchView = MenuItemCompat.getActionView(searchItem) as SearchView
            searchView.setOnCloseListener {
                searchView.onActionViewCollapsed()

                Log.v("MainActivity", "setOnCloseListener: onClose")
                true
            }

            searchView.setOnFocusChangeListener { v, hasFocus ->

                Log.v("MainActivity", "setOnFocusChangeListener: hasFocus: $hasFocus")
            }

            val searchPlate = searchView.findViewById(androidx.appcompat.R.id.search_src_text) as EditText
            searchPlate.hint = "Search"
            val searchPlateView: View =
                searchView.findViewById(androidx.appcompat.R.id.search_plate)
            searchPlateView.setBackgroundColor(
                ContextCompat.getColor(
                    this,
                    android.R.color.transparent
                )
            )

            searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
                override fun onQueryTextSubmit(query: String?): Boolean {
                    Toast.makeText(applicationContext, query, Toast.LENGTH_SHORT).show()

                    this@MainActivity.query = query

                    mMenuItemChangedListener?.onDrawerItemClickListener(selectedIdentifier, query)
                    return false
                }

                override fun onQueryTextChange(newText: String?): Boolean {
                    return false
                }
            })

            val searchManager =
                getSystemService(Context.SEARCH_SERVICE) as SearchManager
            searchView.setSearchableInfo(searchManager.getSearchableInfo(componentName))
        }
     }