Find nearest gas station using google maps v2 in android and want to display the route to it

Question

The following code will help me locate neighboring gas stations, but how do I locate the one that is closest to me?

StringBuilder googlePlacesUrl = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
        googlePlacesUrl.append("location=" + source.latitude + "," + source.longitude);
        googlePlacesUrl.append("&radius=" + PROOXIMITY_RADIUS);
        googlePlacesUrl.append("&types=" + "gas_station");
        googlePlacesUrl.append("&sensor=true");
        googlePlacesUrl.append("&key=" + GOOGLE_API_KEY);

Using the above code, I am creating the url to get the nearest gas stations.

public String read(String httpUrl){
        String httpData = "";
        InputStream stream = null;
        HttpURLConnection urlConnection = null;
        try{
            URL url = new URL(httpUrl);
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.connect();
            stream = urlConnection.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
            StringBuffer buf = new StringBuffer();
            String line = "";
            while((line = reader.readLine()) != null){
                buf.append(line);
            }
            httpData = buf.toString();
            reader.close();
        } catch (Exception e) {
            Log.e("HttpRequestHandler" , e.getMessage());
        } finally {
            try {
                stream.close();
                urlConnection.disconnect();
            } catch (Exception e){
                Log.e("HttpRequestHandler" , e.getMessage());
            }
        }

        return httpData;
    }

I am now parsing the response after this.

But my main objective is to locate the closest. Even though I can calculate the distance using latitude and longitude, there must be a simpler method.

Can somebody assist me in that?