#clone the jni code to this directory
git clone git@github.com:keesj/librtlsdr-android jni
run ndk-build
build the application 
plug in your device and use logcat or other tools to view what is happening.

Runnning:
If you install the APK on your phone and it will start and rtl_tcp listening 
on *all* interfaces (port 1234). I managed to test the code running gqrx.