Limiting the amount of Calls to a Server
I see several problems with your code:


You're mixing server code with UI
You're leaking activity reference in the Runnable
Your call takes longer time than 100ms
With code inside of you runnable you will miss changes to values that happened after the thread started (if it's not finished yet)


It is quite extensive to solve the first point. But all other points are quite easy to do:


Make inner class static and use a static variable to be delivered to server. This is not a nice solution, since everything should be stateless but at least you will fix the memory leak. If you make a presenter or uploader class that I would always notify it about UI updates and this new class will be resposnsible about removing back pressure from network uploading
I don't know if it is problem or not but I will do it a bit differently. I would create a Handler and submit Runnable to upload with delay 1 second (or your preferrable delay). And if there are changes are happening I would just reschedule the submission with same delay to later. So it will guarantee that you submit only "final" values in the delay context
Will be solved by #3