When running gradle createDebugCoverageReport on an Android Gradle project, the built-in JaCoCo support builds an HTML report and an XML report.
As far as I know it is not possible to use this with Jenkins CI at the moment, because the plug-in wants the .exec file.

The report XML file starts with the following lines (looks like a standard format?):

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE report PUBLIC "-//JACOCO//DTD Report 1.0//EN" "report.dtd">
<report name="debug">
<sessioninfo id="unknownhost-a0d58b54" start="1415952183361" dump="1415952207146"/>

I would love to see support for this in the Jenkins CI JaCoCo plug-in.

https://github.com/jenkinsci/jacoco-plugin/issues/49