These are the sources of the android app Raspicast:
https://play.google.com/store/apps/details?id=at.huber.raspicast
This was written during 2013 - 2015, due to the upcoming deprecation of the OMX API on the Raspberry Pi it will require updates.
If you have the android sdk and the java jdk installed you can build from the commandline with:
gradlew build
Or to build just the release:
gradlew aR
It can also be built with android studio after importing.
The sources are licensed under the GPLv2 see:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
or the supplied LICENSE.