Splitting apk in android projects

Hi,

As you know, in android we can publish several APK with different manifests. That allows us to have apk for HD screens, an apk for SD screens, etc. This allows us to have lighter downloads

eg: HD is 45mb + SD is 20mb = 65mb (big download)

but if we split into two apk, we just have a 45mb apk and a 20mb apk. That’s cool but I have a question:

- How do we organize the project in a way that makes it easy to make an SD or HD project without copy/paste the adequate resources to the project every time we want to make an apk file?

Thanks.

JB