Regarding the Size of the APK/libs for Android App

I happen to look at the PDFHTTPDemo and trying to develop an application that has a similar use case at this point of time I observe that the the /libs is around 11.5mb and when I package it the size of the apk is around 7mb .
Hence I would like to know by how much will my apk size would increase if i use this SDK ?
What is the memory footprint of the standard license sdk ?

delete "x86" and "mips" in libs dir, if you never run on x86 and mips devices.
this can reduce much size.