creates the function that generates a observable based on an item emitted by another observable . concode_field_sep Func1<? super T,? extends Observable<? extends U>> collectionSelector concode_elem_sep Func2<? super T,? super U,? extends R> resultSelector concode_field_sep Subscriber<? super T> call
Func1 < T , Observable < U >> function ( final Func1 < ? super T , ? extends Iterable < ? extends U >> arg0 ) { return new Func1 < T , Observable < U >> ( ) { @ Override public Observable < U > call ( T arg1 ) { return Observable . from ( arg0 . call ( arg1 ) ) ; } } ; }