The latest versions
As I'm writing the latest Zebra's EMDK for Android is v6.6, supporting KitKat, Lollipop and Marshmallow devices. All the documentation is available on TechDocs, and from there you can find all the samples and their source code on GitHub, under the Zebra organization.
Here you can find the latest version of the samples:
The older sample
Sample for older version of Zebra's EMDK for Android are still available on github but under a different organization: Developer Zebra.
Here you can find:
Plus you can find the ADT version of the sample:
A note on the sample
All these sample repositories are build in the same way. The master branch contains only a README file and there's a branch for every sample, PLUS a branch with all the sample that is the one that I usually clone using the command:
git clone -b AllSamples <Repository to clone>
edit for layout and typos.