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How to parse JSON on Android using Kotlin?
This example demonstrates how to parse JSON on Android using 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" tools:context=".MainActivity"> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="70dp" android:background="#008080" android:padding="5dp" android:text="TutorialsPoint" android:textColor="#fff" android:textSize="24sp" android:textStyle="bold" /> <TextView android:textColor="@android:color/background_dark" android:id="@+id/textViewName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textSize="16sp" android:textStyle="bold|italic" /> <TextView android:id="@+id/textViewSal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textViewName" android:layout_centerInParent="true" android:textColor="@android:color/background_dark" android:textSize="16sp" android:textStyle="bold" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.os.Bundle import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import org.json.JSONException import org.json.JSONObject class MainActivity : AppCompatActivity() { lateinit var textViewName: TextView lateinit var textViewSal: TextView var jsonString = "{"employee":{"name":"tutorialspoint","salary":65000}}" lateinit var name:String lateinit var salary:String override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" textViewName = findViewById(R.id.textViewName) textViewSal = findViewById(R.id.textViewSal) try { // get JSONObject from JSON file val obj = JSONObject(jsonString) // fetch JSONObject named employee val employee: JSONObject = obj.getJSONObject("employee") // get employee name and salary name = employee.getString("name") salary = employee.getString("salary") // set employee name and salary in TextView's textViewName.text = "Name: $name" textViewSal.text = "Salary: $salary" } catch (e: JSONException) { e.printStackTrace() } } }
Step 4 − 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="com.example.q11"> <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.
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