Am new here and not verse with Java. Please can someone help me on how to start?
We are happy you are here! You are more likely to get a useful response if you are explicit about what your project entails, giving a few more details might help someone give you a nudge in the right direction.
If you have no knowledge of Java, then you can consider an alternative: Kotlin. Google is encouraging people to use Kotlin as a viable alternative to Java for Android.
Either Java or Kotlin: get a copy of the IntelliJ IDE (free version). Read the docs and set up a basic project, get it running in an emulation environment. Since you’re talking about messaging, you probably need a server, database, and API to talk to it. So you need to figure that out as well.
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