Android implementing Volley using Kotlin

Hey Guys, today I am going to tell you how to implement Network hits using Volley Library in Kotlin. Before getting into this tutorial, I tell you what Volley is.

Android volley is a networking library was introduced to make networking calls much easier, faster without writing tons of code. By default all the volley network calls works asynchronously, so we don’t have to worry about using asynctask anymore.

Volley comes with a lot of features. Some of them are
1. Request queuing and prioritization
2. Effective request cache and memory management
3. Extensibility and customization of the library to our needs
4. Cancelling the requests

1. Creating New Project
In Android Studio, create a new project by navigating to File ⇒ New Project and fill all the required details (do not forget to check “Include Kotlin support”). When it prompts to select a default activity, select Blank Activity and proceed.

2. Open build.gradle and add volley support by adding this under dependencies section.

implementation 'com.android.volley:volley:1.0.0'

3: Include INTERNET permission inside AndroidManifest.xml file

<uses-permission android:name="android.permission.INTERNET"/>

Step 5:
i) Create an object of RequestQueue class.

val queue : RequestQueue = Volley.newRequestQueue(this)

ii) Create a JSONObjectRequest with response and error listener.

        val url = "https://jsonplaceholder.typicode.com/users"
        val request =  JsonObjectRequest(Request.Method.GET ,  url, null , {
            response: JSONObject? ->
            Log.e("Response : " , response.toString())
        } , {
            error: VolleyError? ->
            Log.e("Error" , error.toString())
        })

iii) Add your request into the RequestQueue.

queue.add(request)

Complete Code of MainActivity.kt file:

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.AppCompatTextView
import com.android.volley.Request
import com.android.volley.RequestQueue
import com.android.volley.VolleyError
import com.android.volley.toolbox.JsonObjectRequest
import com.android.volley.toolbox.Volley
import org.json.JSONObject

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        apiHit()
    }

    private fun apiHit() {
        val url = "https://jsonplaceholder.typicode.com/users"
        val queue : RequestQueue = Volley.newRequestQueue(this)
        val request =  JsonObjectRequest(Request.Method.GET ,  url, null , {
            response: JSONObject? ->
            Log.e("Response : " , response.toString())
        } , {
            error: VolleyError? ->
            Log.e("Error" , error.toString())
        })
        queue.add(request)
    }
}

Source Code: https://github.com/iamsonumalik/Android-Volley-kotlin-Example

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