kelas klik intent untuk pindah ke layaout kuis (di json saya seperti ini
$id_level = $_GET['id_level'];
$mysql = mysqli_query($con, "SELECT tbl_quiz.*, tbl_level.level FROM tbl_quiz, tbl_level where tbl_quiz.id_level = tbl_level.id_level and tbl_level.id_level = '$id_level'"
)
@Override
        public void onClick(View v) {
            new FetchQuestionsAsync(this).execute(DATA_URL + "?id_level=1234");
            if(pass.size()!=0) {
            Intent intent = new Intent(context, list_quiz.class);
            intent.putExtra(DATA, pass);
                for (Question q: pass) {
                    Toast.makeText(context, q.getQuestion(), Toast.LENGTH_LONG).show();
                    System.out.println("isinya: " + q.getQuestion());
                }
            v.getContext().startActivity(intent);
        }
        else
        {
            Toast.makeText(context,"try Again",Toast.LENGTH_SHORT).show();
        }
        }

=====================================================================================
package com.pengenalan.budaya.quiz;

import android.content.Context;
import android.os.AsyncTask;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.util.ArrayList;


public class FetchQuestionsAsync extends AsyncTask<String,Void,ArrayList<Question>>{

    IData activity;

    public FetchQuestionsAsync(IData activity) {
        this.activity = activity;
    }

    @Override
    protected ArrayList<Question> doInBackground(String... params) {
        RequestParams requestParams=new RequestParams("GET",params[0]);
        StringBuilder stringBuilder=new StringBuilder("");
        try {
            HttpURLConnection httpURLConnection=requestParams.setUpConnection();
            httpURLConnection.connect();

            int status_code = httpURLConnection.getResponseCode();
            if (status_code == HttpURLConnection.HTTP_OK) {
                BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
                stringBuilder = new StringBuilder("");
                String line = "";
                while ((line = br.readLine()) != null) {
                    stringBuilder.append(line);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        ArrayList<Question> list=QuizUtil.parser(stringBuilder.toString());

        return list;
    }

    @Override
    protected void onPostExecute(ArrayList<Question> questions) {
        super.onPostExecute(questions);
        activity.setUpData(questions);
    }

    static public interface IData
    {
        public void setUpData(ArrayList<Question> questions);
        public Context getContext();
    }
}

========================================================================================================
package com.pengenalan.budaya.quiz;

import android.util.Log;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * Created by febin on 06/02/2017.
 */

public class RequestParams {
    String method;

    public RequestParams(String method, String baseURL) {
        this.method = method;
        this.baseURL = baseURL;
    }

    String baseURL;
    HashMap<String,String> params=new HashMap<>();
    public void addParam(String key,String value)
    {
        params.put(key,value);
    }
    public String getEncodedParams()
    {
        StringBuilder stringBuilder=new StringBuilder();
        for(String key:params.keySet())
        {
            try {
                String value= URLEncoder.encode(params.get(key),"UTF-8");
                if(stringBuilder.length()>0)
                {
                    stringBuilder.append("&");

                }
                stringBuilder.append(key+"="+value);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        return stringBuilder.toString();
    }
    public String getEncodedURL()
    {
        return  baseURL+"?"+getEncodedParams();
    }
    public HttpURLConnection setUpConnection() throws IOException {
        HttpURLConnection httpURLConnection=null;
        if(method.equals("GET"))
        {
            Log.d("check here","test");
            URL url=new URL(getEncodedURL());
            httpURLConnection=(HttpURLConnection)url.openConnection();
            httpURLConnection.setRequestMethod("GET");
            return httpURLConnection;
        }
        else
        {
            URL url=new URL(this.baseURL);
            httpURLConnection=(HttpURLConnection)url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            OutputStreamWriter outputStreamWriter=new OutputStreamWriter(httpURLConnection.getOutputStream());
            outputStreamWriter.write(getEncodedParams());
            outputStreamWriter.flush();
        }
        return httpURLConnection;
    }

}