Android FechData

FechData.java

package com.example.mostafa.json;
import android.os.AsyncTask;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class FechData extends AsyncTask<Void, Void, Void> {
    String data ="";
    @Override
    protected Void doInBackground(Void... voids) {
        try {
            URL url = new URL("https://api.myjson.com/bins/hx610");

             // create connection
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.connect();

            // create input stream
            InputStream inputStream = httpURLConnection.getInputStream();

            // create BufferedReader
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

            // create string line that read line by line
            String line = "";
            line = bufferedReader.readLine();
            Log.d("linee",line);
            while ((line = bufferedReader.readLine()) != null){
                Log.d("Dataa",data);
                data = data + line;
            }

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        MainActivity.data.setText(this.data);
    }
}

MainActivity.java

package com.example.mostafa.json;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    public static TextView data ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        data = (TextView) findViewById(R.id.TextViewData);

    }

    public void getData(View view){

         Toast.makeText(this,"button clickd",Toast.LENGTH_SHORT).show();
        FechData process = new FechData();

        process.execute();
    }
}