AndroidAtoms.java is an auto-generated file from the selenium project. The atoms build for selendroid is tested in selenium's ci http://ci.seleniumhq.org:8080/job/thirdparty-dependent-atoms-build/

After cloning the selenium project one should run the following command:

./go //javascript/android-atoms:atoms

This will generate the file

build/javascript/android-atoms/AndroidAtoms.java  

copy the file to the selendroid project and update the package to match the destination.