HTTP GET REQUEST

package com.example.thibaut.tp1;

import android.app.Activity;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.EditText;

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

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


/**
 * Created by thibaut on 08/10/2015.
 */
class JSONAsyncTask extends AsyncTask<String, String, String> {


    Activity mActivity;
    EditText out;

    public JSONAsyncTask(Activity a) {
        this.mActivity = a;
    }


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

    }

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

        StringBuilder result = new StringBuilder();

        HttpURLConnection urlConnection = null;


        try {
            URL url = new URL("http://api.fixer.io/latest?base=USD&symbols=EUR");
            urlConnection = (HttpURLConnection) url.openConnection();
            InputStream in = new BufferedInputStream(urlConnection.getInputStream());

            BufferedReader reader = new BufferedReader(new InputStreamReader(in));

            String line;
            while ((line = reader.readLine()) != null) {
                result.append(line);
            }

        }catch( Exception e) {
            e.printStackTrace();
        }
        finally {
            assert urlConnection != null;
            urlConnection.disconnect();
        }


        return result.toString();
    }


    protected void onPostExecute(String result) {


        try {
            JSONObject data = new JSONObject(result);

            String tx = data.getString("rates");

            JSONObject currency = new JSONObject(tx);

            double value = currency.getDouble("EUR");


            out = (EditText)
                mActivity.findViewById(R.id.output_value);

            out.setText( Double.toString(value) );

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





    }
}