How to parse JSON on Android?

AndroidApps/ApplicationsMobile Development

This example demonstrates how to parse JSON in android.

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: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"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/tvName"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="50dp"
      android:text="Name"
      android:textColor="#000"
      android:textSize="20sp" />
   <TextView
      android:id="@+id/tvSalary"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="80dp"
      android:text="Salary"
      android:textColor="#000"
      android:textSize="20sp" />
</RelativeLayout>

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

package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
   String JSON_STRING="{\"employee\":{\"name\":\"adolf hitler\",\"salary\":65000}}";
   String name, salary;
   TextView employeeName, employeeSalary;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      // get the reference of TextView's
      employeeName=(TextView) findViewById(R.id.tvName);
      employeeSalary=(TextView) findViewById(R.id.tvSalary);
      try {
         // get JSONObject from JSON file
         JSONObject obj=new JSONObject(JSON_STRING);
         // fetch JSONObject named employee
         JSONObject employee=obj.getJSONObject("employee");
         // get employee name and salary
         name=employee.getString("name");
         salary=employee.getString("salary");
         // set employee name and salary in TextView's
         employeeName.setText("Name: "+name);
         employeeSalary.setText("Salary: "+salary);
      } catch (JSONException e) {
         e.printStackTrace();
      }
   }
}

Step 4 − Add the following code to manifests/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.myapplication">
   <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 Play Icon  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

raja
Published on 29-Aug-2019 17:31:20
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