Your question isn't clear (to me), but if you want to trigger a build
via HTTP, check the "Submitting builds" section of the API wiki page:
https://wiki.jenkins-ci.org/display/JENKINS/Remote+access+API
If you want to build an Android app with Jenkins, use the "Invoke Ant"
build step, or the "Execute shell" build step (or the Gradle plugin) to
run your Gradle wrapper. Same as you would when building the app from
the command line.
Regards,
Chris