Adding Chat for patient

ChatActivity.kt

fun initChat() {
    initEmoji()
    if (doctor != null) {
        CometChat.getLoggedInUser()?.let {

            CometChat.getUser(doctor!!.doctorId, object : CometChat.CallbackListener<User>() {
                override fun onSuccess(doctorUser: User?) {
                    var bundle = Bundle()
                    var chatFragment: Fragment = CometChatMessageScreen()

                    bundle.apply {
                        putString(StringContract.IntentStrings.AVATAR, doctor!!.imageUrl)
                        putString(StringContract.IntentStrings.NAME, doctorUser!!.name)
                        putString(StringContract.IntentStrings.UID, doctorUser!!.uid)
                        putString(StringContract.IntentStrings.STATUS, doctorUser!!.status)
                        putString(
                            StringContract.IntentStrings.TYPE,
                            CometChatConstants.RECEIVER_TYPE_USER
                        )
                    }

                    chatFragment.arguments = bundle
                    supportFragmentManager.beginTransaction()
                        .replace(R.id.chatFrame, chatFragment)
                        .commit()
                }

                override fun onError(p0: CometChatException?) {
                    finish()
                }
            })
        }
    }
}