JSON Volly url

 

MainActivity :-

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

   <ListView
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:id="@+id/listview"/>

</androidx.constraintlayout.widget.ConstraintLayout>

Show item Activity :-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent">
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/name"
    android:textSize="20sp"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/age"
        android:textSize="20sp"/>
</LinearLayout>



MainActivity Java :-

package com.example.jsonurl;

import androidx.appcompat.app.AppCompatActivity;

import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity {
ListView listView;
String name,age;
String jsonurl= "https://run.mocky.io/v3/3fba2beb-4dde-4e03-853b-f6c19fa8fffd";
ArrayList<HashMap<String,String>> friends;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        friends = new ArrayList<>();
        listView = findViewById(R.id.listview);
GetData getdata = new GetData();
getdata.execute();
    }
    public class GetData extends AsyncTask<String,String,String>{

        @Override
        protected String doInBackground(String... strings) {
            String current ="";
            try {
                URL url;
                HttpURLConnection urlConnection = null;
                try {
                    url = new URL(jsonurl);
                    urlConnection =(HttpURLConnection) url.openConnection();
                    InputStream inputStream = urlConnection.getInputStream();
                    InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                    int data = inputStreamReader.read();
                    while (data!= -1){
                        current += (char) data;
                        data = inputStreamReader.read();

                    }
                    return current;


                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                finally {
                    if (urlConnection != null){
                        urlConnection.disconnect();
                    }
                }

            }catch (Exception e){
                e.printStackTrace();
            }
            return  current;
        }

        @Override
        protected void onPostExecute(String s) {
           try {
               JSONObject jsonObject = new JSONObject(s);
               JSONArray jsonArray = jsonObject.getJSONArray("Friends");
               for (int i = 0 ; i<jsonArray.length(); i++){
                   JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                   name = jsonObject1.getString("name");
                   age = jsonObject1.getString("age");
                   HashMap <String,String>friend = new HashMap<>();
                   friend.put("name",name);
                   friend.put("age",age);
                   friends.add(friend);
               }
           } catch (JSONException e) {
               e.printStackTrace();
           }
            ListAdapter adapter = new SimpleAdapter(
                    MainActivity.this,
                    friends,
                    R.layout.showdata,
                    new String[]{"name","age"},
                    new int[]{R.id.name,R.id.age}

            );
           listView.setAdapter(adapter);
        }
    }
}