The esieast way AFAIK is to use a lib like http://loopj.com/android-async-http/ or volley lije k0sh says to send data to a PHP script that will manage you mysql data.
You'll have to write a php( or java) script in your server to receive your data ( You should write a REST API)
To select your HTTP lib, you should look here:
What is the most robust HTTP library for android?
You should really care about how you are going to sync your datas, because it could drain your battery.
Here you will learn how to optimize your updates:
https://developer.android.com/training/efficient-downloads/index.html
Hope it helps!
