realtime-chat | laravel project for private user | Chat library

Recently I wanted to get a grip on programming for Android. While I was getting through this tutorial: https://dev.to/medaymentn/creating-a-realtime-chat-app-with-android--nodejs-and-socketio-4o55 it turned out that for Android 9 (API level 28) I couldn't connect to my local nodejs server from android device emulator. If I just change all build dependencies to use lower API levels (<=27) it connects correctly. From what i've read on the behavior changes for Android 9 I don't really know what could cause such a thing. Here is the code that is critical i think.

I am making chat app in android through socket.io which includes recylerview/adapter & model class. I have also successfully added emoji library separately but i want to add emoji library & recyclerview on same activity. Can you guide me about how can I do it on same page(activity). Responses will be highly appreciated.

I am following these guides.

https://github.com/hani-momanii/SuperNova-Emoji

https://dev.to/medaymentn/creating-a-realtime-chat-app-with-android--nodejs-and-socketio-4o55

I'm using a Listview to show messages in a chat-like layout (similar to this chat template) but having a problem with the Listview scrolling past the first row when entering a reply.

Here's my layout

EDIT: The original question asked for a real-time solution. I am not sure this is necessary. It should be about as fast as sending a standard SMS text message.

I want to integrate group chat in my android / ios app. There is a similar question found here, but the answers are old and I would like to see if there are any new / better solutions.

I am currently using multiple AWS services in my app, and would like to keep my chat solution in the same ecosystem. However, if there is a solution outside of AWS that is much easier to implement with good results, I am open to the suggestion.

Based on my research I have come across a couple of possibilties:

• This AWS blog lightly covers using ElastiCache for this purpose

• This LinkedIn slideshow demonstrates the possibility of using AWS IoT

Requirements for my chat:

• Would like to be able to support up to 500 people per chat group

• Usable from the web via online portal that has the same general functionality as the mobile app

• Needs to be scalable to handle thousands of groups

• Needs to handle emojies (cross platform)

• Needs to allow for file transfers. Images and GIFs at the very least.

• Send push notifications to users who have elected to recieve them when they are not currently active in the group

Are either of my possiblities a good fit for my requirements? Which would be the easiest to implement? Are there other, easier solutions inside of AWS? Outside of AWS?

I take a reference with http://www.androidhive.info/2016/02/android-push-notifications-using-gcm-php-mysql-realtime-chat-app-part-2/ I find that if i use the code , i can't show the notification