With Retrofit we can compose the HTTP connection easily through a simple expressive. and then set some stuff on your custom adapter based on that (like:myAdapter. Retrofit is a type-safe HTTP client for Android and Java. You'll probobly need to expose a single stream saying what the status is of the cards (like you've hit the end of the list, or there is more to go) etc. Or if you want it to be super slick you'll need to do your own pagination solution.īasically you'll fire events from the UI (ideally in an RX stream) that say "requesting more cards" and then that will make API to get more cards, cache those results, and push them up to the UI. Where CardsLoading is a sealed class withĭata class Loading(val cards: List, val pageNumber: Int)Īnd then have different setup in the UI based on that data (like a small view at the bottom which says "Loading Page #X". But since you are going to use RxJava, the nature of Rxjava is already asynchronous. To make this point clear assume that we need. You can also wire it up to be an Observable> and emit the first result, and then the next with the first etc so that it loads immediately then continues adding cards.Īnother option is to do something like Observable It provides a callback function to get the response asynchronously. Retrofit and RxJava What is Retrofit Simply if you need to send or receive data from server you need to serialize data to be able to retrieve it. To make this point clear assume that we need to send user. Something like: CardsRepository() with methods to get all the cards etc. What is Retrofit Simply if you need to send or receive data from server you need to serialize data to be able to retrieve it. concat()) there are a couple other notes here.Īlways cache the data (you should have some data layer anywhere where you have caching, disk (if needed), and API etc. Look into flatMap, concatMap, and other operators which combine and transform streams.īesides the obvious (like. This took 2 minutes to log all of the items ( 357 from ): public class MainActivity extends AppCompatActivity We'll build an example application interacting with the GitHub API using the standard Retrofit approach, and then we'll enhance it using RxJava to leverage the advantages of Reactive Programming. I need to make nested calls because as you can see from api each item has a url that leads to actual item data and if I want to display item image then I need to go even further ( ). Overview This article focuses on how to implement a simple RxJava-ready REST Client using Retrofit. If I want to display a list of them all it would be EXTREMELY slow even if I would split it all in pages and load 20 per page. Problem is that in total there are 357 items. I am working on my first Android app for learning experience and using to display all cards from API call. Material Design Icons Weekly Threads Calendar For news and questions about these topics try using other subs likeĪndroid Job Interview Questions and Answers This sub-reddit isn't about phones' and apps' general functionality, support, or system software development (ROMs). This article is based on Retrofit2.News for Android app developers with the who, what, where, when, and how of the Android community. In addition, it also has powerful scalability, supports various format conversion and RXJAVA. It translates a basic Java interface into a HTTP request through a dynamic agent and sends the request through OKHTTP. Retrofit2 is simply a network request adapter. Call.execute () and Call.enqueue () Methods In Retrofit 2, all requests are wrapped into a retrofit2.Call object.
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