apk creator using android mobile application

hello to every one
I have given a task of developing an application which can take input from user and create a apk for it I dont know how it is possible but plz help me as soon as possible.

How to import update binary zip using Android Flashable Zip Creator beta 3.0

I've asked in the tools Q&A thread, but the creator seems to have neglected questions in recent months.

Using the 3.0 Beta version of the tool, I'm trying to import the update binary of the Cyanogenmod Falcon ROM (scroll to the bottom if site's still buggy) for my Moto G Lollipop phone. I've extracted the zip of the nightly build, and then extracted the update binary within as instructed in this FAQ:

My device is not in the list. What should I do to use this tool?
- Just extract any working zip for your device and extract update-binary from zip's META-INF/google/android folder and import that binary in the tool, make a zip and try flashing it to your device. If the ZIP install is successful, then share update-binary by replying to this thread. Your device will get added to supported devices' list.

However, there's still no zip to import.