Build a Whatsapp Like App in 24 Hours: Create a Cross-Platform Instant Messaging for Android

Bundled along with this documentation is a copy of the FreshIM App, the WhatsApp clone for the Android platform. The clone application has been completely built keeping in mind, the customizability and functionality of our users, who will be using the application for their own purposes.
Using this app, you could build your own internal private chat within your closed network – probably at your university or workplace. Also, if you’ve been looking to build a Messenger application service of your own that the public can use, here’s something that can get you started as well. This means you’ll now get to run your own messaging service just like WhatsApp, WeChat or LINE which can be used by everyone around!
We've bundled everything you’ll need to run the application and this documentation has it all explained in detail. Should you ever be stuck with a Java file or not know where to change the layout, we've got it all covered below. The goal is to get you doing things as soon as possible. You start with small things at first and then build on what you already know. The result is a book that gives you the skills you need to write an app in an easily digestible format. You can go as fast or slow as you wish. And once you are creating apps, you can turn back to specific parts of the book for a refresher.