Check out example codes for "search bar android studio kotlin". It will help you in understanding the concepts better.

Code Example 1

override fun onCreateOptionsMenu(menu: Menu): Boolean {    menuInflater.inflate(R.menu.search_menu, menu)    val searchItem: MenuItem = menu.findItem(R.id.action_search)    if (searchItem != null) {        searchView = MenuItemCompat.getActionView(searchItem) as SearchView        searchView.setOnCloseListener(object : SearchView.OnCloseListener {            override fun onClose(): Boolean {                return true            }        })        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 {// do your logic here                Toast.makeText(applicationContext, query, Toast.LENGTH_SHORT).show()                return false            }            override fun onQueryTextChange(newText: String?): Boolean {                return false            }        })        val searchManager =            getSystemService(Context.SEARCH_SERVICE) as SearchManager        searchView.setSearchableInfo(searchManager.getSearchableInfo(componentName))    }    return super.onCreateOptionsMenu(menu)}onQueryTextSubmit

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