How to display json data in listview . Android

platform.json
{
    "platform": [{
            "name": "Windows"
        },
        {
            "name": "Linux"
        },
        {
            "name": "MacOs"
        }
    ]
}


AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />


res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.example.samuray.myapplication.MainActivity">

    <ListView
        android:id="@+id/lvMain"
        android:layout_width="368dp"
        android:layout_height="495dp"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp" />
</android.support.constraint.ConstraintLayout>


res/layout/item.xml
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="#FFF"
    android:gravity="left">
    
    <TextView
        android:layout_height="25dp"
        android:layout_width="wrap_content"
        android:text="+15"
        android:textColor="#000"
        android:textSize="19sp"
        android:id="@+id/name_item"
        android:textStyle="bold"
        android:gravity="center"/>
</LinearLayout>


MainActivity.java
package com.example.samuray.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.os.AsyncTask;

import android.util.Log;
import android.widget.ListView;
import android.widget.SimpleAdapter;

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

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new ParseTask().execute();
    }
    private class ParseTask extends AsyncTask<Void, Void, String> {

        HttpURLConnection urlConnection = null;
        BufferedReader reader = null;
        String resultJson = "";

        @Override
        protected String doInBackground(Void... params) {
            try {
                String $url_json = "http://www.anar8.ru/test/1/platform.json";
                URL url = new URL($url_json);

                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();

                InputStream inputStream = urlConnection.getInputStream();
                StringBuffer buffer = new StringBuffer();

                reader = new BufferedReader(new InputStreamReader(inputStream));

                String line;
                while ((line = reader.readLine()) != null) {
                    buffer.append(line);
                }

                resultJson = buffer.toString();
                Log.d("FOR_LOG", resultJson);

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


        protected void onPostExecute(String strJson) {
            super.onPostExecute(strJson);

            final ListView lView = (ListView) findViewById(R.id.lvMain);

            String[] from = {"name_item"};
            int[] to = {R.id.name_item};
            ArrayList<HashMap<String, String>> arrayList = new ArrayList<HashMap<String, String>>();
            HashMap<String, String> hashmap;

            try {
                JSONObject json = new JSONObject(strJson);
                JSONArray jArray = json.getJSONArray("platform");

                for (int i = 0; i < jArray.length(); i++) {
                    JSONObject friend = jArray.getJSONObject(i);

                    String nameOS = friend.getString("name");
                    Log.d("FOR_LOG", nameOS);

                    hashmap = new HashMap<String, String>();
                    hashmap.put("name_item", "" + nameOS);
                    arrayList.add(hashmap);
                }

                final SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, arrayList, R.layout.item, from, to);
                lView.setAdapter(adapter);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }
}