rxjava小试牛刀map和flatmap_map(new function-优快云博客

本文通过示例代码介绍了如何使用RxJava中的FlatMap和Map操作符来处理复杂的集合操作，如遍历并转换集合中的元素，以及如何过滤和限制输出结果。

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map遍历转换：

打印某个省符合条件的的全部电台名

List<Radio> newList = new ArrayList<>();//某个省的所有电台，此处代替get
for (int i = 0; i < 3; i++)
{
    newList.add(new Radio().setCitymc("城市" + i));
}

Observable.fromArray(newList.toArray()).map(new Function<Object, String>()
{
    @Override
    public String apply(Object Radio) throws Exception
    {
        return ((Radio) Radio).getCitymc();
    }
}).filter(new Predicate<String>()
{
    @Override
    public boolean test(String s) throws Exception
    {
        return !s.equals("城市2");
    }
}).take(2).subscribe(new Consumer<String>()
{
    @Override
    public void accept(String s) throws Exception
    {
        Log.d("resultttt", s);
    }
});

flatmap:

打印每个省下全部电台名

Province[] newArr = new Province[3];
for (int i = 0; i < 3; i++) {
    Province g66 = new Province();
    List<Radio> g6List = new ArrayList<>();
    for (int j = 0; j < 1 + i; j++) {
        g6List.add(new Radio().setCitymc("城市" + (char) (97 + j)));
    }
    g66.setTianqis(g6List);
    newArr[i] = g66;
}

Observable.fromArray(newArr).flatMap(new Function<Province, ObservableSource<Radio>>() {
    @Override
    public ObservableSource<Radio> apply(Province g6tianqii) throws Exception {
        return Observable.fromIterable(g6tianqii.getTianqis());
    }
}).filter(new Predicate<Radio>() {
    @Override
    public boolean test(Radio s) throws Exception {
        return !s.getCitymc().equals("城市a");
    }
}).take(8).subscribe(new Consumer<Radio>() {
    @Override
    public void accept(Radio s) throws Exception {
        Log.d("resultttt", "输出" + s.getCitymc());
    }
});