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I am having a hard time in understanding the Retrofit for my App. I want to use retrofit in it but I am not understanding about it much.
Everthing is very confusing in it. Can any one help me to learn it completely
I dont know how to start and from where to start
The links I have gone through while trying to learn are as follows :
Using Retrofit 2.0 in Android
http://www.vogella.com/tutorials/Retrofit/article.html
http://mobilesiri.com/retrofit-tutorial-android-studio/
http://www.androidhive.info/2016/05/android-working-with-retrofit-http-library/
https://futurestud.io/blog/retrofit-getting-started-and-android-client
First you have many different library you can use instead of Retrofit , the basic one and i think the simplest is Okhttp but you have to understand that Okhttp is no more supported but still work when you downgrade your SDKVersion , and you can use Volley to perform the same service as Retrofit
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how can I create a simple app that retrieve any data from server, I am stuck I don't know how I can start if anyone can help me?
You can use ktor, which is a networking library from Jetbrains. See an example here:
https://github.com/touchlab/KaMPKit/blob/kpg/ktor_hack/shared/src/commonMain/kotlin/co/touchlab/kampkit/ktor/DogApiImpl.kt#L38
The request needs to be made on the main thread in native, just FYI.
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Today i used retrofit library in my project instead of AsyncTask because it is faster than HttpUrlConnection but i am wondering how it is faster and what mechanism they are using. I searched about that but didn't get the accurate or satisfactory answer. Please help me out to understand the concept behind it.
Async task execute serially and are single threaded by default and they will wait for last call to complete before execution of next one and designed in a way so that to avoid common errors due to parallel running threads. Retrofit is not. It sends calls parallely and use ThreadPoolExecutor.
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I did some research on Google Volley and found that it is somewhat easy and clean to use.
But I am still not sure as to what the advantages of using it are and whether I should still use the AsyncTask.
I know AsyncTask works as a background task and that it is separate but what about Volley?
Which one should I opt for?
This is mainly an opinion based question that is largely dependent on the needs of your particular application. Volley provides a lot of things for you out of the box, like network caching (assuming you're given correct cache headers from your server), and an easy to use API with all of your callbacks and different threading layers handled for you. So, it really depends on what you're looking. Personally, I think any production worthy application should use some sort of networking library that a team has spent plenty of time patching and prepping for you (rather than trying to reinvent the wheel), and since a Google team has gone through the trouble for doing this for you...why not?
One cannot compare Volley with an AsyncTask.
So your question makes no sense.
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This question is actually not about the coding, so I don't put any codes here.
While looking into the Volley library, I found out that some part of the APIs contain classes (e.g. classes of the org.apache.http packages) that are now deprecated in Android API level 22.
As I'm concerned about getting adjusted to the newest API environment, do you think it is still worth using Volley or would you recommend using other libraries such as OkHttp or Retrofit?
Check out the detailed response:
Comparison of Android networking libraries: OkHTTP, Retrofit, and Volley
Personally, I went native to keep things simple and robust. Using it for JSON responses and occasional images with no problem and I don't think they will deprecate HttpURLConnection anytime soon.
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There are many frameworks to make http requests in Android, like Retrofit and Volley. But also, Android has its own classes to make this type of request, like HttpURLConnection and HttpClient
So what is the advantage of using some framework like these mentioned?
My doubt is if there is some big advantage in make requests using some framework, instead of using Android native classes.
The advantage is things like retries, restarts, threading & synchronization, and state management will be handled for you. This comes at the expense of configurability, but it's not a huge expense.