private String getRequestParams() throws UnsupportedEncodingException {
		String parameters = keywords;
		parameters = URLEncoder.encode(keywords, "utf-8");
		parameters = parameters.replaceAll("\\+", "%20");
		parameters = URLEncoder.encode(parameters, "utf-8");
		if (province != null && province != "") {
			if (district == null || district == "")
				district = "1000";
			parameters += "&region=custom:" + province + ":" + district;
		}
		if (startTime != null && startTime != "" || endTime != null
				&& endTime != "") {
			parameters += "&timescope=custom:" + startTime + ":" + endTime;
		}
		return parameters;
	}