无法解析 rxjava 2 中的 Observable.from 方法 [英] Cannot resolve method Observable.from in rxjava 2

问题描述

rxjava 1 中的 Observable 类中有一个 from 方法，但在 rxjava 2 中找不到.如何在以下代码中替换 rxjava 2 中的 from 方法:

There is a from method in the Observable class in rxjava 1 but not found in rxjava 2. How can I replace the from method in rxjava 2 in the following code:

    List<Integer> ints = new ArrayList<>();
    for (int i=1; i<10; i++) {
        ints.add(new Integer(i));
    }
    Observable.just(ints)
            .flatMap(new Function<List<Integer>, Observable<Integer>>() {
                @Override
                public Observable<Integer> apply(List<Integer> ints) {
                    return Observable.from(ints);
                }
            })

推荐答案

你可以使用 Observable.fromIterable(source)

来自文档:

一些运算符重载已用后缀重命名，例如fromArray、fromIterable 等.原因是当库是用 Java 8 编译的，javac 经常无法消除歧义功能接口类型之间.

Some operator overloads have been renamed with a postfix, such as fromArray, fromIterable etc. The reason for this is that when the library is compiled with Java 8, the javac often can't disambiguate between functional interface types.

List<Integer> ints = new ArrayList<>();
for (int i=1; i<10; i++) {
    ints.add(new Integer(i));
}
Observable.just(ints)
        .flatMap(new Function<List<Integer>, Observable<Integer>>() {
            @Override
            public Observable<Integer> apply(List<Integer> ints) {
                return Observable.fromIterable(ints);
            }
        })

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