How to parse JSONArray in Android app?

This example demonstrates how do I parse JSONArray in android app.

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/textView"
      android:textSize="24sp"
      android:textStyle="bold"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
   TextView textView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      String strJson = "{ \"Basic info\"
         :[{\"Name\":\"Mash\",\"Age\":\"27\"," +
         "\"Gender\":\"Male\"},{\"Name\":\"Niyaz\",\"Age\":\"23\"," +
         "\"Gender\":\"Male\"}]}";
      String data = "";
      try {
         JSONObject jsonRootObject = new JSONObject(strJson);
         JSONArray jsonArray = jsonRootObject.optJSONArray("Basic info");
         int i=0;
         while (i < jsonArray.length()) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            int age = Integer.parseInt(jsonObject.optString("Age"));
            String name = jsonObject.optString("Name");
            String gender = jsonObject.optString("Gender");
            data += "Node"+i+" : 
 Name= "+ name +" 

               Age= "+ age +" 
 Gender= "+ gender + " 
 ";
            i++;
         }
         textView.setText(data);
      } catch (JSONException e) {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="app.com.sample">
   <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 Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −