Android call Rest API in a loop

Question

I'm new to android, so have some questions regarding api calls.

Currently i use Retrofit to accomplish my api calls.

Here is example of my api call with retrofit

@POST("posts/new")
fun createPost(@Body post: Post, @Header("Authorization") token: String): Single<PostResult>

So, assume i have 10 posts and i need to call createPost 10 times (Yes, i know i can have list input on BE side, but ... ). Best way is to iterate over posts (for/map) and send them to the server.

But here is problem:
- How do i can track that all calls are done?

In JS i can have something like Promise.all - could i do something similar in android?

I thought about counting the finished vs started requests, but i think it's bit ugly isn't?

Your question is broad. You could use RxJava to zip, or coroutines to async/await or other methods. — shkschneider, Mar 25 '19 at 16:05
I think this can help you https://medium.com/@szholdiyarov/concurrent-jobs-on-android-using-promises-3fda27b3e776 — Agustin Pazos, Mar 25 '19 at 17:39
If you are using Kotlin check this answer https://stackoverflow.com/questions/54719864/kotlin-coroutines-how-to-block-to-await-join-all-jobs — Sérgio Eduardo, Mar 25 '19 at 21:13

score 1 · Answer 1 · answered Mar 26 '19 at 12:41

1

in your response success you need to call again get/post method. after success you know your api call is done or else it throw error.

answered Mar 26 '19 at 12:41

Harpreet Singh

21
2

score 0 · Answer 2 · answered Mar 26 '19 at 11:40

Thanks to @shkschneider

Your question is broad. You could use RxJava to zip, or coroutines to async/await or other methods.

Ended up with usage of .zip

Single.zip(observables) { args -> args }
      .subscribeOn(Schedulers.io())
      .observeOn(AndroidSchedulers.mainThread())
      .subscribe({ ...Success }, { ...Failure })

Android call Rest API in a loop

2 Answers2