listenKeyboardChanged

    private fun listenKeyboardChanged() {
        mBinding!!.rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
            override fun onGlobalLayout() {
                val screenHeight = Resources.getSystem().getDisplayMetrics().heightPixels
                var rect = Rect()
                activity.window.decorView.getWindowVisibleDisplayFrame(rect)
                val keyboardHeight: Int = screenHeight - rect.height() - getStatusBarHeight()
            }
        })
    }