Parse Server response in Java and save values to Java Variables

I am developing an android application for the first time, and have some questions about parsing data in Java that is supplied from a Server via HTTP parsing. Right now, I am able to test a simple connection, respond with "Data Matched" and read that successfully. This means my server side code is correct, as well as how I grab the info.

My next step is to turn my PHP server response to JSON and send to Java. But I'm not sure how to get Java to read the JSON array I will be sending, and save the parts into accessible variables in Java.

I've reviewed the two following stackoverflow questions, but I'm still not sure how to implement that suggestion into my existing code.

How to parse a JSON and turn its values into an Array?

How to get data as an json array from a server and convert it in to java array to use in android application

MY CODE:

HttpParse:

package [domain_package].lexaapp;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by rachel.dimouro on 12/6/2017.
*/

public class HttpParse {

  String FinalHttpData = "";
  String Result ;
  BufferedWriter bufferedWriter ;
  OutputStream outputStream ;
  BufferedReader bufferedReader ;
  StringBuilder stringBuilder = new StringBuilder();
  URL url;

  public String postRequest(HashMap<String, String> Data, String HttpUrlHolder) {

    try {
        url = new URL(HttpUrlHolder);

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

        httpURLConnection.setReadTimeout(14000);

        httpURLConnection.setConnectTimeout(14000);

        httpURLConnection.setRequestMethod("POST");

        httpURLConnection.setDoInput(true);

        httpURLConnection.setDoOutput(true);

        outputStream = httpURLConnection.getOutputStream();

        bufferedWriter = new BufferedWriter(

                new OutputStreamWriter(outputStream, "UTF-8"));

        bufferedWriter.write(FinalDataParse(Data));

        bufferedWriter.flush();

        bufferedWriter.close();

        outputStream.close();

        if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {

            bufferedReader = new BufferedReader(
                    new InputStreamReader(
                            httpURLConnection.getInputStream()
                    )
            );
            FinalHttpData = bufferedReader.readLine();
        }
        else {
            FinalHttpData = "Something Went Wrong";
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return FinalHttpData;
  }

  public String FinalDataParse(HashMap<String,String> hashMap2) throws UnsupportedEncodingException {

    for(Map.Entry<String,String> map_entry : hashMap2.entrySet()){

        stringBuilder.append("&");

        stringBuilder.append(URLEncoder.encode(map_entry.getKey(), "UTF-8"));

        stringBuilder.append("=");

        stringBuilder.append(URLEncoder.encode(map_entry.getValue(), "UTF-8"));

    }

    Result = stringBuilder.toString();

    return Result ;
  }
}

Java function To act on Data:

    public void SGSearchFunction(final String SearchInput){

    class SGSearchClass extends AsyncTask<String,Void,String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            progressDialog = ProgressDialog.show(DashboardActivity.this,"Loading Data",null,true,true);
        }

        @Override
        protected void onPostExecute(String httpResponseMsg) {

            super.onPostExecute(httpResponseMsg);

            progressDialog.dismiss();

            // is this where I should put the code for the array, or does it go in the HttpParse section?
            if(httpResponseMsg.equalsIgnoreCase("Data Matched")){ 

                finish();

                Intent intent = new Intent(DashboardActivity.this, SGInfoActivity.class);

                intent.putExtra(SearchValue, SearchInput);

                startActivity(intent);


            } else {

                Toast.makeText(DashboardActivity.this,httpResponseMsg,Toast.LENGTH_LONG).show();
            }

        }

        @Override
        protected String doInBackground(String... params) {

            hashMap.put("SearchInput",params[0]);

            finalResultSearch = httpParse.postRequest(hashMap, HttpURL);

            return finalResultSearch;
        }
    }

    SGSearchClass sgSearchClass = new SGSearchClass();

    sgSearchClass.execute(SearchInput);
}

All help is appreciated.

Thanks!