How to change application settings and create an apk file?

Question

Android

There is a client Android application from a third-party developer.
The client is required to create connection parameters: server address login and password.
Task: to collect and send apk files to clients with parameters already set.
Tell me, please, how can this be done without access to the source code of the application?

Answer 1

apk is a normal zip. If the address, login, etc. are in a separate file - unpack, change, pack. There may be problems if the application is signed for the market.