override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
        if (ev?.action == MotionEvent.ACTION_DOWN) {
            val view = currentFocus
            if (!isInputArea(view, ev)) {
                hideSoftKeyboard()
                view?.clearFocus()
            }
        }
        return super.dispatchTouchEvent(ev)
    }

    private fun isInputArea(view: View?, event: MotionEvent): Boolean {
        if (view != null && view is EditText) {
            val area = intArrayOf(0, 0)
            view.getLocationInWindow(area)
            val left = area[0]
            val top = area[1]
            val bottom = top + view.getHeight()
            val right = left + view.getWidth()
            return event.x > left && event.x < right && event.y > top && event.y < bottom
        }
        return false
    }

    private fun hideSoftKeyboard() {
        val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
        val view = currentFocus
        if (view != null) {
            imm.hideSoftInputFromWindow(view.windowToken, 0)
        }
    }