Android graphing from mysql with php

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http://stackoverflow.com – I am trying to pull data from mysql hosted on a remote server to create a line graph for an android app. I found a tutorial on how to do something similar and I'm trying implement his work which I will then extrapolate. The app comes up on my tablet but does hangs up when I click submit (which should cause the data to be pulled and graphed.) I've included the html and php files I am working with. I am new to this but I'm trying to teach myself. If anyone could see if I am missing anything crucial I would be greatly appreciative. Here is the html which calls the php: <!DOCTYPE HTML PUBL (HowTos)