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I was wondering if there are some commonly used techniques for synchronizing an app with a server? I have looked at the socket-framework and maybe some http? I am thinking for instance when making a game or a grocery list, any developers out there who want to share?
I would say that the most common method is to send client data via HTTP POST using SSL/TLS encryption. The data can be sent in any format, but generally it is structured as a JSON or XML message.
The hardest part is that you need some form of authentication in order to identify the user and update/sync the correct information on the server database in a secure manner. Have a look at this article for some basic concepts.
In android, you can use the excellent Google Gson library to convert Java object to/from JSON objects.
Http communication can be performed via the Android API methods.