Signout functionality

ProfileFragment.kt

bi.txtSignout.setOnClickListener {
    CometChat.logout(object : CometChat.CallbackListener<String>() {
        override fun onSuccess(p0: String?) {
            val i = Intent(activity, MainActivity::class.java)
            i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
            i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
            startActivity(i)
            activity?.finish()
        }

        override fun onError(ex: CometChatException?) {
            Snackbar.make(bi.root, ex?.localizedMessage ?: "Couldn't logout CometChat user", Snackbar.LENGTH_SHORT).show()
        }
    })
}