How to get json object in http connection

MainActivity.java

package android.com.getjson;

import android.os.AsyncTask;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.TextView;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

public class MainActivity extends AppCompatActivity {

TextView tv;

ListView listView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv= (TextView) findViewById(R.id.text);

listView= (ListView) findViewById(R.id.list_item);

LoadUrl loadUrl=new LoadUrl();

loadUrl.execute();

}

class LoadUrl extends AsyncTask<String, Void, String>

{

String result="";

ArrayAdapter adapter;

@Override

protected String doInBackground(String... params) {

try {

URL url=new URL("enter your url here");

HttpURLConnection urlConnection= (HttpURLConnection) url.openConnection();

urlConnection.setDoOutput(true);

urlConnection.setRequestMethod("POST");

urlConnection.setUseCaches(false);

urlConnection.setConnectTimeout(10000);

urlConnection.setReadTimeout(10000);

urlConnection.setRequestProperty("Content-Type", "application/json");

urlConnection.connect();

JSONObject jsonObject=new JSONObject();

jsonObject.put("TipsiteoperatorId", 53); //according to your post

OutputStreamWriter out=new OutputStreamWriter(urlConnection.getOutputStream());

out.write(jsonObject.toString());

out.close();

BufferedReader br=new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));

String line;

while((line=br.readLine())!=null)

{

result+=line;

}

JSONObject js=new JSONObject(result);

JSONArray jsonArray=js.getJSONArray("responsepacket");

String[] userDetail=new String[jsonArray.length()];

for(int i=0; i<jsonArray.length();i++)

{

JSONObject jsonObject1=jsonArray.getJSONObject(i);

userDetail[i]=String.valueOf(jsonObject1.getString("Id"));

userDetail[i]=userDetail[i]+" : "+jsonObject1.getString("ProductName");

}

adapter=new ArrayAdapter<String>(getApplicationContext(),R.layout.items,userDetail);

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} catch (JSONException e) {

e.printStackTrace();

}

return null;

}

@Override

protected void onPostExecute(String s) {

listView.setAdapter(adapter);

super.onPostExecute(s);

}

}

}

Layouts

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"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="android.com.getjson.MainActivity">

<ListView

android:id="@+id/list_item"

android:layout_width="match_parent"

android:layout_height="match_parent"/>

</RelativeLayout>

items.xml

<TextView

android:id="@+id/items"

android:layout_margin="10dp"

android:textSize="30dp"

android:text="list item"

android:textColor="#000000"

android:layout_height="wrap_content"

android:layout_width="wrap_content"

xmlns:android="http://schemas.android.com/apk/res/android" />

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