android kotlin - Volley basic authentication example

MainActivity.kt

package com.cfsuman.kotlintutorials

import android.app.Activity
import android.os.Bundle
import android.widget.*
import com.android.volley.Request


class MainActivity : Activity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // get the widgets reference from XML layout
        val button = findViewById<Button>(R.id.button)
        val textView = findViewById<TextView>(R.id.textView)


        // Run volley
        button.setOnClickListener {
            // Disable the button itself
            it.isEnabled = false

            //val credentials = "username:$password"
            val credentials = "postman:password"
            val url = "https://postman-echo.com/basic-auth"
            textView.text = ""

            // Make a volley custom json object request
            // with basic authentication
            val request = CustomJsonObjectRequestBasicAuth(
                Request.Method.GET, url,null,
                { response->
                    try {
                        // Parse the json object here
                        textView.text = "Response : $response"
                    }catch (e:Exception){
                        e.printStackTrace()
                        textView.text = "Parse exception : $e"
                    }
                }, {
                    textView.text = "Volley error: $it}"
                },credentials
            )

            // Add the volley request to request queue
            VolleySingleton.getInstance(this)
                .addToRequestQueue(request)
        }
    }
}

CustomJsonObjectRequestBasicAuth.kt

package com.cfsuman.kotlintutorials

import android.util.Base64
import com.android.volley.AuthFailureError
import com.android.volley.Response
import com.android.volley.toolbox.JsonObjectRequest
import org.json.JSONObject


// Class to make a volley json object request
// with basic authentication
class CustomJsonObjectRequestBasicAuth(
    method:Int, url: String,
    jsonObject: JSONObject?,
    listener: Response.Listener<JSONObject>,
    errorListener: Response.ErrorListener,
    credentials:String
)
    : JsonObjectRequest(
    method,url, jsonObject, listener, errorListener) {

    private var mCredentials:String = credentials

    @Throws(AuthFailureError::class)
    override fun getHeaders(): Map<String, String> {
        val headers = HashMap<String, String>()
        headers["Content-Type"] = "application/json"
        //val credentials:String = "username:password"
        val auth = "Basic " + Base64.encodeToString(
            mCredentials.toByteArray(),
            Base64.NO_WRAP)
        headers["Authorization"] = auth
        return headers
    }
}

VolleySingleton.kt

package com.cfsuman.kotlintutorials

import android.content.Context
import com.android.volley.Request
import com.android.volley.RequestQueue
import com.android.volley.toolbox.Volley

class VolleySingleton constructor(context: Context) {
    companion object {
        @Volatile
        private var INSTANCE: VolleySingleton? = null
        fun getInstance(context: Context) =
            INSTANCE ?: synchronized(this) {
                INSTANCE ?: VolleySingleton(context).also {
                    INSTANCE = it
                }
            }
    }
    private val requestQueue: RequestQueue by lazy {
        // applicationContext is key, it keeps you from leaking the
        // Activity or BroadcastReceiver if someone passes one in.
        Volley.newRequestQueue(context.applicationContext)
    }
    fun <T> addToRequestQueue(req: Request<T>) {
        requestQueue.add(req)
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Run Volley"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="16dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button"
        tools:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>

gradle dependencies

// Volley network library
implementation 'com.android.volley:volley:1.2.1'