Does Retrofit make network calls on main thread?

Question

I am trying to explore Retrofit+OkHttp on Android. Here\'s some code I found online :

RestAdapter restAdapter = new RestAdapter.Builder().setExecutors(execu         


        

Answer 1

Kotlin Coroutines

When using a suspend function to make a network request, Retrofit uses a Coroutine CallAdapter to dispatch on a worker thread.

Therefore, a coroutine does not need to be explicitly launched on the Dispatcher.IO thread.

See Android documentation: Page from network and database > Implement a RemoteMediator

Sample

Injection.kt

object Injection {
    val feedService = Retrofit.Builder()
        .baseUrl(TWITTER_API_BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .build()
        .create(FeedService::class.java)
}

FeedService.kt

interface FeedService {
    // Retrofit makes the request on a background thread.
    @GET("lists/{listType}")
    suspend fun getTweets(
        @Path(LIST_TYPE_PATH) listType: String,
        @Query(LIST_ID_QUERY) listId: String,
        @Query(LIST_COUNT_QUERY) count: String,
        @Query(LIST_PAGE_NUM_QUERY) page: String
    ): List
}

FeedPagingSource

class FeedPagingSource : PagingSource() {
    override suspend fun load(params: LoadParams): LoadResult {
        try {
            // The results are returned on the main thread.
            val tweets: List = Injection.feedService.getTweets(...)
            return LoadResult.Page(...)
        } catch (error: Exception) { ... }
    }
}