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How to use Volley Library to parse JSON in Android Kotlin App?
This example demonstrates how to use Volley Library to parse JSON in Kotlin.
Step 1 − Create a new project in Android Studio, go to File ⇉ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16sp" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="50dp" android:text="Tutorials Point" android:textAlignment="center" android:textColor="@android:color/holo_green_dark" android:textSize="32sp" android:textStyle="bold" /> <TextView android:id="@+id/textViewResult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textColor="@android:color/black" android:textSize="20sp" /> <Button android:id="@+id/btnParse" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerInParent="true" android:layout_marginBottom="20sp" android:text="Parse JSON" /> </RelativeLayout>
Step 3 − Add the following dependency to the build.gradle file−
implementation 'com.android.volley:volley:1.1.0'
Step 4 − Add the following code to MainActivity.kt
import android.os.Bundle import android.widget.Button import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import com.android.volley.Request import com.android.volley.RequestQueue import com.android.volley.Response import com.android.volley.toolbox.JsonObjectRequest import com.android.volley.toolbox.Volley import org.json.JSONException class MainActivity : AppCompatActivity() { private lateinit var textView: TextView private var requestQueue: RequestQueue? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" textView = findViewById(R.id.textViewResult) val button: Button = findViewById(R.id.btnParse) requestQueue = Volley.newRequestQueue(this) button.setOnClickListener { jsonParse() } } private fun jsonParse() { val url = "https://api.myjson.com/bins/xbspb" val request = JsonObjectRequest(Request.Method.GET, url, null, Response.Listener { response ->try { val jsonArray = response.getJSONArray("employees") for (i in 0 until jsonArray.length()) { val employee = jsonArray.getJSONObject(i) val firstName = employee.getString("firstname") val age = employee.getInt("age") val mail = employee.getString("mail") textView.append("$firstName, $age, $mail
") } } catch (e: JSONException) { e.printStackTrace() } }, Response.ErrorListener { error -> error.printStackTrace() }) requestQueue?.add(request) } }
Step 5 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.kotlipapp"> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.