Oh boy. "A positive 32-bit integer" to you is the same as "32"? While it is true that 32 is a 32-bit integer, the same is true for all number from 1 to 2^32-1. Randomly picking one (whether it is 32 or some other number) is a bad approach for getting things done. So in addition to the pages I mentioned earlier, you also need to read this page:
http://developer.android.com/guide/topics/manifest/uses-sdk-element.html about the <uses-sdk> element.
Realistically, you should read a book Android from A to Z, as your approach to learning seems to be to pick random bits of information here and there and try to connect them somehow without understanding what they actually mean.