How to find a bug?

Question

Android

There is an application made using PhoneGap. Everything works on IOS.
But the same android app is not getting data from remote json file.
Please tell me how to find the cause of the problem. And in general, how to do debugging in order to understand whether the matter is in the network or in the application itself.
Thank you.

Answer 1

1) Look at the logs
2) Pound all branches of the problematic code with logs
3) Use debugging, breakpoints and other magic.

Answer 2

using Jquery $.getJSON( "ajax/test.json", function( data )