This is literally the only thing you need to start using RxJava on Android.
Include RxJava and RxAndroid in your gradle dependencies:
// use the last version
compile 'io.reactivex.rxjava2:rxjava:2.1.1'
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
RxAndroid main addition to RxJava is a Sche...
