.APK are the ANDROID PACKAGE KITS the android installers in other words. If no DRM process is in place, they are really easy to modify.

1.

Spoiler: Download easyapkdisassembler and extract it

The version I have is 1.3.2 by Orion downloaded here

2.

Spoiler: Rename your apk to something short if it is not and put it in easyapkdisassembler's folder.

It will save you hassle. Android package have a tendency to have long filenames.

3.


4.

Spoiler: Select 0 and write the name of your apk

It will create a dis_filename folder containing your uncompressed APK.
the smali folder contains the uncompiled classes.dex(run file) this is where you can change the code and do whatever you please.
You have to know how to code of course. But if you don't you can change pictures and files in other directories.

5.

Spoiler: Once you are finished. Select 1 in easyapkdisassembler and have fun.

It will recompile everything back and signed to be reinstalled on your device.

Note. you have to have JAVA installed or it will give you an error.

 

[Cartmanuk]

You need to add more info its too basic.



apk format - (Android Package Kit)

U will need to explain how to go through the setup and basic commands.