初次接触Xabber

官方介绍(https://www.xabber.com/)

Xabberis the most popular open-source XMPP client for Android. It
supports multiple XEPs, Off-The-Record (OTR) chat encryption and is
available in multiple languages.

Xabber is built around open source standards, interoperability, design
and user experience.

Xabber is one of the most advanced clients in a world, yet superbly
designed and highly customizable to suit any user.

接下来研究源码

源码下载地址:

GitHub - redsolution/xabber-android: Open-source XMPP client for Android