Scheduler which uses
handler to execute actions.
AndroidSchedulers.mainThread() or
null if default should be used.
RxAndroidSchedulersHook to use based on order of precedence as defined in the
RxAndroidPlugins class header.
Scheduler backed by a
Handler.
Scheduler which executes actions on the Android UI thread.
RxAndroidSchedulersHook implementation as a global override of any injected or default implementations.
register methods in this class default implementation