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Retrofit Tutorial Part 1 – SIMPLE GET REQUEST – Android Studio Tutorial

2 Views June 30, 2020 32 Comments

Retrofit Tutorial Part 1 – SIMPLE GET REQUEST – Android Studio Tutorial Pin It



In this video series we will learn how to use Retrofit, which is a type-safe HTTP client for Android and Java.
Retrofit allows easy communication with a web service by abstracting the HTTP API into a Java interface.

In part 1 we will set up Retrofit in a new Android Studio project by adding the necessary Gradle dependencies, and then already do our first GET request.
We create an interface with 1 method that we annotate with @GET and the relative URL to the API endpoint of the REST API we want to query. We then create a Retrofit instance, define the baseUrl, add GSON as the converter by passing GsonConverterFactory to the addConverterFactory method, and let Retrofit create the implementation of our API interface at compile time.
The Call object that our GET method returns encapsulates a single request + response. With enqueue we can execute this request asynchcronously on a background thread and get our result back in the onResponse callback. OnFailure will be called if something in the process of communicating with the server or processing the response went wrong. With isSuccessFull we check if our response code is between 200 and 300 and if that’s the case we can retrieve our result from the response body.
GSON will parse the array of JSON objects into a List of the Java model class that we prepared beforehand.

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Example code, links & dependencies:

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32 Comments

  1. Muhammad Kamal
    •
    2 months ago

    make your life easy
    the latest version of retrofit for example 2.9.0 will cause an error
    use this instead :

    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'

    Reply
  2. Jonasz Przybycień
    •
    2 months ago

    Here's an example:
    I want to access this rest api https://danepubliczne.imgw.pl/api/data/synop so I write https://danepubliczne.imgw.pl/ in .baseUrl and the relative address in @GET. But all I get is zeroes. My repo is here:
    https://github.com/Zemogiter/AmaWeatherApp
    Any help?

    Reply
  3. yah chan
    •
    2 months ago

    is this playlist all about networking ?

    Reply
  4. beingknow
    •
    2 months ago

    Thank you so much, also clapping in end 😍

    Reply
  5. Ahmad Jamous
    •
    2 months ago

    I'm trying to get list of object from my api but i got an error called: expected begin_array but was begin_object i didn't find the solution can you help ?

    Reply
  6. Adittya Raj
    •
    2 months ago

    Danke Schon!!!

    Reply
  7. DRIVE MAN
    •
    2 months ago

    Hello teacher, I have been following you for almost a year, and I am happy about that, but I find something that is missing from me, which is how to display specific data from the table for each employee as each employee sees the work required of him only

    Reply
  8. Shakeel Haider
    •
    2 months ago

    sir I use retrofit in my own project with flask backend and face SSL Handshake Error. I Google it but nothing found :(. could you please help me to resolve the error.

    Reply
  9. pedram
    •
    2 months ago

    thanks you so much

    Reply
  10. pedram
    •
    2 months ago

    so good explain the code. thank you

    Reply
  11. Pandurang P Naik
    •
    2 months ago

    What if their is only base url available?

    Reply
  12. Ravi Sorathiya
    •
    2 months ago

    Is it always preferable use to retrofit library compare to other library

    Reply
  13. Arpit Gupta
    •
    2 months ago

    Is this in JAVA?

    Reply
  14. Pandurang P Naik
    •
    2 months ago

    please use recycler view

    Reply
  15. xxthebbkidxx
    •
    2 months ago

    My data is returning null my base url is :.baseUrl("https://covidtracking.com/") and my relative url is : @GET("api/states")

    Reply
  16. Akhil Pandey
    •
    2 months ago

    Thank you so much for these free tutorials! I just got my very first internship as an android app developer and now I have to learn and get used to these things, you're videos are really helpful. You're a lifesaver! Love from India <3

    Reply
  17. Youness labghough
    •
    2 months ago

    how to can i connect my localhost server ????

    Reply
  18. Rahul Pandey
    •
    2 months ago

    Starting with version 2.7.0 (December 2019), Retrofit now requires at minimum Java 8+ or Android API 21+. So if you're seeing a runtime exception about "No static method metafactory", add this into your build.gradle file in the app module.
    android {
    compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
    }
    …
    }

    Reply
  19. Sinb O'bey
    •
    2 months ago

    Hi, Thanks for the tutorial. As mentioned in the video as your plan to do, do you have another tutorial combining retrofit with android architecture components?

    Reply
  20. Rajmanov
    •
    2 months ago

    But the most spoken language is Chinese, more people don't speak English that people than do, that's a very bad analogy btw

    Reply
  21. LearnTech in Hindi
    •
    2 months ago

    i want to know if our json object is not in proper sequence and also we have to sequence the object the How we gonna do with retrofit??? Is retrofit method is more complex than the normal one without any library??

    Reply
  22. hamza abuammar
    •
    2 months ago

    can I send from my android app csv file to flask server?
    I will generate dataset from android as csv file, send it to machine learning model hosted on flask server, and return the prediction.

    Reply
  23. Daniel Prowse
    •
    2 months ago

    at 1:34am.. the clapping at @19:15 scared the shit out of me 🤣 Great video!

    Reply
  24. Adel Benhamida
    •
    2 months ago

    Thank you so much, your video just made me continue my last Project which i was stuck in !

    Reply
  25. Chimezie Orji-Unegbu
    •
    2 months ago

    Your videos are truly amazing that I have decamped from one I always thought was el dorado to yours, thanks.

    However I keep getting the exception javax.net.ssl.SSL ProtocolException. It makes me sad

    Reply
  26. Arpit Rastogi
    •
    2 months ago

    I have created a working example on GitHub with latest dependencies, for reference – https://github.com/rastoarpit/Retrofit2_Java

    Reply
  27. Rima rima
    •
    2 months ago

    Beautiful. Bless u

    Reply
  28. Khairul Islam
    •
    2 months ago

    Hi jsonplaceholder site is error now

    Reply
  29. pmig81
    •
    2 months ago

    How would you make the call with Retrofit if you had an object and an array of objects? Would you need 2 pojo's ?
    like this, for example : https://api.covid19api.com/summary

    Reply
  30. pmig81
    •
    2 months ago

    Thanks for all the great tutorials.

    Reply
  31. Da Jo
    •
    2 months ago

    When I try to do what you do my app doesn't start anymore with the message "app keeps stopping".
    This is the code:
    https://pastebin.com/JqwwNcBS

    If I remove everything except the api class and the "RKIApi rkiApi = getRetrofitInstance().create(RKIApi.class);" it still happens.

    Reply
  32. PBoroGamer
    •
    2 months ago

    Danke, du bist toll!

    Reply

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