Hide & show android keyboard

sample.kt

// keyboard hide after click on button 

val inputMethodManager =
            getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager

// when click on button hideKeyboard() call
btn_done.setOnClickListener {
            showKeyboard(it)
            hideKeyboard(it)
        }	          

// @params v is that button clicked on it
private fun hideKeyboard(v: View?) {
        inputMethodManager.hideSoftInputFromWindow(v?.windowToken, 0)

    }

// @params v is that button clicked on it
private fun showKeyboard(v: View) = inputMethodManager.showSoftInput(v, 0)