public class TestUrlConection {

private static String responseServer   = "";
private static String method = null;
private static ProgressDialog progressDialog = null;
private static String getFireBase = null;
private static String urlAddress;

private static Context activityContext;
public static OnAsyncRequestComplete caller;

public interface OnAsyncRequestComplete {
    void asyncResponse(String response);
}// Fin OnAsyncRequestComplete

public static void request(Context activity, String url, String requestMethod ){

    activityContext = activity;
    urlAddress      = url;
    method          = requestMethod;
    caller          = ( OnAsyncRequestComplete )activityContext;
    new MakeRequest().execute();

}// Fin request

public static class MakeRequest extends AsyncTask<String, String, String>{


    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(activityContext);
    }

    @Override
    protected void onPostExecute(String response) {
        super.onPostExecute(response);
        if (progressDialog != null && progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
        caller.asyncResponse( response );

    }// Fin onPostExecute

    @Override
    protected void onProgressUpdate(String... values) {
        super.onProgressUpdate( values );
    }

    @Override
    protected void onCancelled(String s) {
        super.onCancelled(s);
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();
    }

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

        if (method == "POST") {

        }
        if (method == "GET") {
            try {
                responseServer = get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }
        if (method == "GETTOKEN") {
            return firebaseinstanceIdTask();
        }

        return null;
    }// Fin doInBackground

}// Fin MakeRequest

private String get() {

    try {

        URL urlServer = new URL( urlAddress );
        HttpURLConnection conectionServer = (HttpURLConnection) urlServer.openConnection();
        conectionServer.setRequestMethod(method);
        conectionServer.setRequestProperty("content-type", "application/json");
        conectionServer.connect();
        InputStream inputStream = conectionServer.getInputStream();
        StringBuffer stringBuffer = new StringBuffer();

        if (inputStream == null) {
            return null;
        }

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuffer.append(line + "n");
        }

        if (stringBuffer.length() == 0) {
            return null;
        }

        String forecastJsonStr = stringBuffer.toString();
        return forecastJsonStr;

    } catch (MalformedURLException e) {

        e.printStackTrace();

    } catch (IOException e) {

        e.printStackTrace();
    }
    return null;
}// fin get


private static String firebaseinstanceIdTask() {

    FireBaseIdService instanceIDService = new FireBaseIdService();
    instanceIDService.onTokenRefresh();
    getFireBase = instanceIDService.getFireBaseToken();
    return getFireBase;

}// Fin firebaseinstanceIdTask

caller          = ( OnAsyncRequestComplete )activityContext;