如何使用RXJava合并由两个Single返回的两个列表？

implementation 'io.reactivex.rxjava2:rxjava:2.x.x'
implementation 'io.reactivex.rxjava2:rxandroid:2.x.x'

Single<List<ItemA>> singleA = Single.just(getListA());
Single<List<ItemB>> singleB = Single.just(getListB());

Single<List<CombinedItem>> combinedSingle = Single.zip(
        singleA,
        singleB,
        (listA, listB) -> combineLists(listA, listB)
);

combinedSingle.subscribe(
        combinedList -> {
            // 处理合并后的列表
        },
        throwable -> {
            // 处理错误情况
        }
);