无法检索JSON数据如何检索它？

Question

这是我的第二项活动。当用户单击该按钮时，语言将从英语更改为阿拉伯语。我还使用Internet来检索一些数据。问题是我不知道如何从互联网上检索数据。我该怎么做？请指导。

package com.moqawalat.lang;

import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.squareup.picasso.Picasso;

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

import java.util.Locale;

import static com.moqawalat.lang.R.id.tv;
import static com.moqawalat.lang.R.id.tv1;

public class Second extends AppCompatActivity {

    Button okbtn;

    TextView countrytxt, languagetxt;
    SharedPreferences pref;
    String getcountry, getlanguage, a, b, c;
    TextView tv, tv1;


    JSONParser jsonparser = new JSONParser();
    JSONObject jsonobject = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        pref = getSharedPreferences("CountryPref", MODE_PRIVATE);

        countrytxt = (TextView) findViewById(R.id.country);
        languagetxt = (TextView) findViewById(R.id.language);
        tv = (TextView) findViewById(R.id.tv);
        tv1 = (TextView) findViewById(R.id.tv1);

        okbtn = (Button) findViewById(R.id.okbtn);

        getcountry = pref.getString("country", "");
        getlanguage = pref.getString("language", "");


        okbtn.setOnClickListener(new View.OnClickListener() {


            @Override
            public void onClick(View view) {



                if (getlanguage.equalsIgnoreCase("en")) {

                    Locale locale = new Locale(getlanguage);
                    Locale.setDefault(locale);
                    Configuration config = new Configuration();
                    config.locale = locale;
                    getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());

                    SharedPreferences sp = getSharedPreferences("pref", MODE_PRIVATE);
                    SharedPreferences.Editor edit = sp.edit();
                    edit.putString("language", getlanguage);
                    edit.commit();

                    countrytxt.setText("Country :" + getlanguage);

                    fragone();


                    Intent i = new Intent(Second.this, Second.class);
                    startActivity(i);
                } else if (getlanguage.equalsIgnoreCase("ar")) {

                    Locale locale = new Locale(getlanguage);
                    Locale.setDefault(locale);
                    Configuration config = new Configuration();
                    config.locale = locale;
                    getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());

                    SharedPreferences sp = getSharedPreferences("pref", MODE_PRIVATE);
                    SharedPreferences.Editor edit = sp.edit();
                    edit.putString("language", getlanguage);
                    edit.commit();
                    countrytxt.setText("Country :" + getlanguage);

                    Intent i = getIntent();
                    finish();
                    startActivity(i);
                }
            }


        });


    }

    private void fragone() {



        this.setContentView(R.layout.activity_second);

        new retrievedata().execute();
        return;

    }

    class retrievedata extends AsyncTask<String, String, String> {


        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            Toast.makeText(Second.this,"Json Data is downloading",Toast.LENGTH_LONG).show();

        }
        @Override
        protected String doInBackground(String... strings) {

            jsonobject = jsonparser.makeHttpRequest("http://www.json-generator.com/api/json/get/cegNjwgBTS?indent=2");

            Log.d("app data", jsonobject.toString());

            try {

                a = jsonobject.getString("name");
                b = jsonobject.getString("data");
                c = jsonobject.getString("image_url");

            } catch (JSONException e){
                e.printStackTrace();
            }
            return a;
        }

        protected  void onPostExecute(String a){
            tv.setText(a);
            tv1.setText(b);

           ImageView image = (ImageView) findViewById(R.id.img);
            Picasso.with(Second.this).load(c).error(R.drawable.error).placeholder(R.drawable.progress_aniamtion).noFade().into(image);
        }
    }
}