Return Observable from an object of SongResponse that contains a List

Question

I have a class SongResponse:

public class SongResponse implements Parcelable {

    @SerializedName("token")
    public String token;

    @SerializedName("items")
    public List<Song> songList;
}

@GET("songs")
Observable<SongResponse> getSongs(@Query("token") String token)

In the manager class, I want to return an Observable by used the request above

public Observable<Song> syncSongs(token) {

    return mSongService.getSongs(token);
        ....

        @Override
        public Observable<Song> call(List<Song> songs) {
            return mDatabaseHelper.setSongs(songs);
        }

}

syncSongs will call another Observer to insert songs in the database.

I used RxAndroid 2. I try to find about .map and .flatMapIterable, but don't result my problem. Could you help me complete this function?

Do you want to return a Observable for each song of the list or for a specified one ? — Cochi, Jun 09 '17 at 09:59

Cochi · Accepted Answer · 2017-06-09T14:56:41.240

0

You can try something like that :

public Observable syncSongs(token) {
    return mSongService.getSongs(token).flatMap(new Function<SongResponse, ObservableSource<List<Song>>() {
        @Override
        public ObservableSource<List<Song>> apply(@io.reactivex.annotations.NonNull SongResponse songResponse) throws Exception {
            return Observable.just(songResponse.getSongList()); //some changes here
        }
    }).flatMapIterable(new Function<List<Song>, Iterable<? extends Song>>() {
        @Override
        public Iterable<? extends Song> apply(List<Song> songs) throws Exception {
            return songs;
        }
    }).flatMap(new Function<Song, Observable<Song>>() {
        @Override
        public Observable<Song> apply(final Song song) throws Exception {
            return Observable.just(song);
        }
    });
}

Hope this helps.

edited Jun 09 '17 at 14:56

answered Jun 09 '17 at 10:30

Cochi

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Thanks @Cochi, but there existe errors, i forgot that Observable getSong() return Observable, not of Song – luoihocbk Jun 09 '17 at 10:53
Can you get the list of song from `SongResponse` ? – Cochi Jun 09 '17 at 11:29
I try this code but it still doesn't work, but thanks anyway – luoihocbk Jun 09 '17 at 12:49
What are the issues ? – Cochi Jun 09 '17 at 12:51
There is a incompatible type error in the return of first flatMap(new Function – luoihocbk Jun 09 '17 at 13:22
I made some changes . – Cochi Jun 09 '17 at 14:57
Thanks a lot @Cochi, it really work. I just change a little bit by unusing flatMapIterable. I can't increase your point but please receive from me 100 points. You really save my time. – luoihocbk Jun 09 '17 at 15:23

Return Observable from an object of SongResponse that contains a List

1 Answers1