Hello, my question is about the security of the apk, there will be some way to make the apk safer, such as that it can not be unzipped or avoided when apcom unpacking access the java class of the application, since If you do that you can have important information if you have it inside the apk as the routes of connection to the server, etc.
The Server's name can be public but any other important data can be retrieved from you server after a login. So a hacker won't be able to gather any other data from your app. Just the code. Everything else is about to secure your php or other server api's.