Easiest way HTTP Networking in Kotlin

JSON DATA FETCHING AND PARSING FROM URL ON ANDROID

---

While developing an Android app, some operations are required to pull data from the Internet. The way Android connects with its own Asynctask is very long and troublesome. We can messed up after a while. So i search and used this libraries for a long time and i decided the best few libraries are retrofit, volley and fuel for HTTP Networking.
Currently the best is the Square Inc. behind the retrofit, it's powerful. The volley is Google. But i will tell you that fuel.

What Will You Learn?

You will learn how to draw data from an API based on the model you prepared and parse it.

Requirements

1. Internet Permission in Manifest File
2. Add this lines in gradle

compile 'com.github.kittinunf.fuel:fuel-gson:1.12.1'
compile 'com.google.code.gson:gson:2.8.2'

Difficulty

It's so easy to retrofit and volley.
Basic for those who know the REST API and data extraction. Otherwise is Intermediate

Description

We will print this to the log by pulling data from a sample json URL. I will create a data model and describe the use of parameters and headers.
I used Fake Online REST API on jsonplaceholder that powered by JSON Server(github project link) and lowdb(github project link)

Video Tutorial

Tutorial

At the beginning of my article, I was connecting with the async task;

public class HttpGetRequest extends AsyncTask<String, Void, String> {  
   public static final String REQUEST_METHOD = "GET";  
   public static final int READ_TIMEOUT = 15000;  
   public static final int CONNECTION_TIMEOUT = 15000;

   @Override   
   protected String doInBackground(String... params){  
      String stringUrl = params\[0\];  
      String result;  
      String inputLine;

      try {  
         //Create a URL object holding our url  
         URL myUrl = new URL(stringUrl);

         //Create a connection  
         HttpURLConnection connection =(HttpURLConnection)       
                myUrl.openConnection();

         //Set methods and timeouts  
         connection.setRequestMethod(REQUEST_METHOD);  
         connection.setReadTimeout(READ_TIMEOUT);  
         connection.setConnectTimeout(CONNECTION_TIMEOUT);  
        
         //Connect to our url  
         connection.connect()

         //Create a new InputStreamReader  
         InputStreamReader streamReader = new   
             InputStreamReader(connection.getInputStream());

         //Create a new buffered reader and String Builder  
         BufferedReader reader = new BufferedReader(streamReader);  
         StringBuilder stringBuilder = new StringBuilder();

         //Check if the line we are reading is not null  
         while((inputLine = reader.readLine()) != null){  
            stringBuilder.append(inputLine);  
         }

         //Close our InputStream and Buffered reader  
         reader.close();  
         streamReader.close();

         //Set our result equal to our stringBuilder  
         result = stringBuilder.toString();  
      }  
      catch(IOException e){  
         e.printStackTrace();  
         result = null;  
      }

      return result;     
   }

   protected void onPostExecute(String result){  
      super.onPostExecute(result);  
   }

}

The above code are quoted from Json
Cromer

It's very complicated. Therefore it makes more sense to use the following.

1. First step is add the libraries in the above requirements.
2. We will create a data class according to the json structure on the site is https://jsonplaceholder.typicode.com/posts

    data class Post(val userId: Int, val id: Int, val title: String, val body: String){  
        class deserialize: ResponseDeserializable<Array<Post>>{  
            override fun deserialize(content: String): Array<Post> = Gson().fromJson(content, Array<Post>::class.java)  
        }  
    }   

1. Then call fuel class and we used ResponseObject to synchronize Post deserialize function in our post data class.

    FuelManager.instance.baseParams = listOf("params" to "something")  
        "https://jsonplaceholder.typicode.com/posts".httpGet().responseObject(Post.deserialize()){  
      request, response, result ->  
      
      val (contents, error) = result  
            Log.e("responseLog", response.toString())  
            Log.e("requestLog", request.toString())  
            contents?.forEach { content ->  
      Log.d("result", "${content.id}= title: ${content.title}")  
            }  
     } 

---

Posted on Utopian.io - Rewarding Open Source Contributors

---