How to correctly build the client-server architecture of the application?

Question

Java

Tell me what you can read on this topic. How to make an Android application that will communicate with the server?

Answer 1

Despite the fact that many new convenient technologies have appeared today, the Service + ContentProvider + CursorLoader bundle I like most of all
https://dl.google.com/googleio/2010/android-develo...
Service can be replaced with something familiar and ready , not the essence
For the implementation of requests, I like the retrofit + gson bundle I
also recommend looking towards rxjava

Answer 2

The session dialog initiator is always the server, regardless of who wants to send the data. If there was no network - we save the status and the message for the next attempt, BUT we always check the lifetime of TOKEN'a: LIMIT.
General view of the process:
time1
TOKEN: request to the server for a token.
QUERY: sending data.
WORK: data processing
time2
IF (time2-time1>LIMIT) GOTO TOKEN
ELSE GOTO QUERY