APK size is bigger than expected - android studio

Question

My project content size like this,

1. Main Project (Source & asset size 513KB)
2. Module 1 (Source & asset size 135KB)
3. Module 2 (Source & asset size 80KB)

And the apk (signed, debug both) size is 4.87MB. Also tried ProGuard nothing changed.

I do not understand the reason of this. Even I have not added any jar file to my project.

Answer 1

There are 2 build variants, for Debug and for Release. Default build option is for Debug which makes size big.

Check this answer : How to use the ProGuard in Android Studio?