To submit a comment, click fabButton and enter a comment. The system of comment submission is similar to the post submission system. We create a function named submitComment(id: Long, text: String) and use it to submit the comment. Here is the submitComment() function: 

@SuppressLint("CheckResult")
private fun submitComment(id: Long, text: String){
    UtilMethods.showLoading(this)
    APIClient.commentAPICall(PrefUtils.getUsername(this)!!, PrefUtils.getPassword(this)!!)
        .postCommentByPostId(id, PrefUtils.getUsernameID(this)!!,text)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe({
                newPostList ->
            commentList = newPostList.comment!!

            Log.wtf("******", commentList.toString())
            commentRecycleViewAdapter.setItems(commentList)
            commentRecycleViewAdapter.notifyDataSetChanged()
            UtilMethods.hideLoading()
        },{
                error ->
            UtilMethods.hideLoading()
            Log.wtf("******", error.message.toString())
            Toast.makeText(applicationContext, error.message.toString(), Toast.LENGTH_SHORT).show()
        })
}