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Volley JsonObjectRequest - Android Kotlin

Tags: Volley JsonObjectRequest, Volley JsonObjectRequest Kotlin, Volley JsonObjectRequest Android example, Kotlin Volley JsonObjectRequest, How to Volley JsonObjectRequest kotlin example.

MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        textView.movementMethod = ScrollingMovementMethod()

        val url = "https://pastebin.com/raw/2bW31yqa"

        button.setOnClickListener {

            progressBar.visibility = View.VISIBLE

            val request = JsonObjectRequest(

                Request.Method.GET, // method

                url, // url

                null, // json request

                { response -> // response listener

                    try {

                        val obj: JSONObject = response

                        val array = obj.getJSONArray("students")

                        textView.text = ""

                        for (i in 0 until  array.length()){

                            val student: JSONObject = array.getJSONObject(i)

                            val firstName: String = student.getString("firstname")

                            val lastName: String = student.getString("lastname")

                            val age: Int = student.getInt("age")

                            textView.append("$firstName $lastName\nage : $age\n\n")

                        }

                    }catch (e: JSONException){

                        textView.text = e.message

                    }

                    progressBar.visibility = View.INVISIBLE

                },

                { error -> 

                    textView.text = error.message

                    progressBar.visibility = View.INVISIBLE

                }

            )

            VolleySingleton.getInstance(applicationContext)

                .addToRequestQueue(request)

        }

    }

}

VolleySingleton.kt

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

                }

            }

    }

    val imageLoader: ImageLoader by lazy {

        ImageLoader(requestQueue,

            object : ImageLoader.ImageCache {

                private val cache = LruCache<String, Bitmap>(20)

                override fun getBitmap(url: String): Bitmap {

                    return cache.get(url)

                }

                override fun putBitmap(url: String, bitmap: Bitmap) {

                    cache.put(url, bitmap)

                }

            })

    }

    private val requestQueue: RequestQueue by lazy {

        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:id="@+id/constraintLayout"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#EDEAE0"

    tools:context=".MainActivity">

    <Button

        android:id="@+id/button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:layout_marginTop="8dp"

        android:text="Get Json Object"

        android:textAllCaps="false"

        android:backgroundTint="#3B2F2F"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

    <ProgressBar

        android:id="@+id/progressBar"

        style="?android:attr/progressBarStyle"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:visibility="invisible"

        app:layout_constraintBottom_toBottomOf="@+id/button"

        app:layout_constraintStart_toEndOf="@+id/button"

        app:layout_constraintTop_toTopOf="@+id/button" />

    <TextView

        android:id="@+id/textView"

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:layout_marginTop="12dp"

        android:layout_marginEnd="8dp"

        android:fontFamily="sans-serif-condensed-medium"

        android:padding="8dp"

        android:textColor="#4F42B5"

        android:textSize="22sp"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/button"

        tools:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>

app.gradle [dependencies]

implementation 'com.android.volley:volley:1.1.1'

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