com.currencyconverter.model.WebService.java Source code

Introduction

Here is the source code for com.currencyconverter.model.WebService.java

Source

/*
* Based in project
* Created by FirstAmong.com
* License MIT
* 
* Based in JsonParsel Tutorial
* http://www.androidhive.info/2012/01/android-json-parsing-tutorial/
* 
*/
package com.currencyconverter.model;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class WebService {

    public Double getDollarValue(String name) throws ClientProtocolException, IOException, JSONException {
        String request = "http://rate-exchange.appspot.com/currency?from=USD&to=" + name;
        JSONObject jObj = getJson(request);
        Double exResult = jObj.getDouble("rate");
        return exResult;
    }

    public JSONObject getJson(String url) throws ClientProtocolException, IOException {

        JSONObject jObj = null;
        InputStream is = null;
        String json = "";

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + json + e.toString());
        }

        // return JSON String
        return jObj;
    }
}