Get values of checkboxes and parse them corresponding to GSON-model

I got a large amount (18) of Checkboxes in my Activity and I have to parse their name (if checked) to JSON and send them to the server. I got a GSON-model to do the parsing, but how do I get the particular values from the checked Checkboxes and how do I save them to the ArrayList? Is there any quick way to do this?

Thanks in advance