public static String buildDownloadUrl(String server,int size,String deviceId,String timestamp){
  String downloadUrl=server + "/download?size=" + size+ "&device_id="+ deviceId+ "&timestamp="+ timestamp;
  return downloadUrl;
}

public static String buildDownloadUrl ( String server , int size , String deviceId , String timestamp ) { String downloadUrl = server + "/download?size=" + size + "&device_id=" + deviceId + "&timestamp=" + timestamp ; return downloadUrl ; }
creates the download string for the test server .
