Skip to main content

Retrofit met Coroutines

Retrofit met Coroutines
Finally the latest version of Retrofit (2.6.0) has got out. While it was already really easy to use and so much fun, Retrofit is now easy…

Finally the latest version of Retrofit (2.6.0) has got out. While it was already really easy to use and so much fun, Retrofit is now easy, fun and shorter to write. Let’s deal with a refactor scenario from the previous version:

Version 2.5.0:

Obviously we have to return the same type until we await() for that response:

Notice we are returning the Deferredtype which holds our response. We won’t stop on what a Deffered is apart from sayin that it’s just a Future.

And when we want to get that response:

Notice we are calling the await() method in order to wait until our asynchronous operation has finished.

Well, no need for that anymore!

Version 2.6.0:

Drop the Deferred type and mark your methods as suspend . Again we wont stop on what suspend methods are apart from saying that it is a way to tell my program that this method is going to be a little late.

And after that, do the same until you await the response:

Now let’s implement the method:

Notice there is no need to await() that method because retrofit does that for you. It will return your defined type.

Note: You should also drop the .addCallAdapterFactory(CoroutineCallAdapterFactory()) from your Retrofit instance build.
I am using GlobalScope because I am not inside a Activity/Fragment/ViewModel which would have theis own lifecycle. Please avoid the GlobalScope . For just an example it’s fine.


Good luck.

Popular posts from this blog

Modularizing your Android app, breaking the monolith (Part 1)

Inspired by a Martin Fowlers post about Micro Frontends, I decided to break my monolithic app into a modular app. I tried to read a little more about breaking monolithic apps in Android, and as far as I got, I felt confident to share my experience with you. This will be some series of blog posts where we actually try to break a simple app into a modularized Android app.

Note: You should know that I am no expert in this, so if there are false statements or mistakes please feel free to criticize, for the sake of a better development. 

What do you benefit from this approach:
Well, people are moving pretty fast nowadays and delivery is required faster and faster. So, in order to achieve this, modularising Android apps is really necessary.You can share features across different apps. Independent teams and less problems per each.Conditional features update.Quicker debugging and fixing.A feature delay doesn't delay the whole app. As per writing tests, there is not too much difference about…

From Gson to Moshi, what I learned

There is no doubt that people are getting away from GSON and I agree with those reasons too. The only advantage GSON has over other parsing libraries is that it takes a really short amount of time to set up. Furthermore, the most important thing is that Moshi is embracing Kotlin support.

First let's implement the dependency:
implementation("com.squareup.moshi:moshi:1.8.0") It's not a struggle to migrate to Moshi. It's really Gson look-a-like. The only thing to do is annotate the object with @field:Json instead of @SerializedName (which is Gsons way for JS representation):

data class User( //GSON way @SerializedName("name") val name: String, @SerializedName("user_name") val userName: String, @SerializedName("last_name") val lastName: String, @SerializedName("email") val email: String ) data class User( //Moshi way @field:Json(name = "name") val name: String, @field:Json(name = "user_name…

Modularizing your Android app, breaking the monolith (Part 2)

This is part 2 of a series of articles about modularizing Android app. If you haven't yet read the first article, you may find it here.

On our first article we just moved some classes outside the application and applied as an independent module. But what if we have dependencies pulled from the application level? This could be a small challenge. First of all, we want to clarify on how are we going to modularize the app. And depending on the previous article, I chose the by feature version of modularization. First of all, let's show some dependencies that are going to be needed in the whole app.

Note: I'm using Dagger for handling dependencies but manual DI or any dependency tool should be fine to understand this part.

So, this is my dependency schema:

Well, it's not that bad, but this isn't what we want to transform to when trying to modularize the app. If you think about it, modules that don't need a dependency, can get it quite easily. For example: A FeatureXVi…