webview loadurl 自动填充

public class ReSetURLUtils {
    public static final String HTTP = "http://";
    public static final String HTTPS = "https://";
    public static final String FILE = "file://";

    public static String reSetUrl(String keyword) {
        keyword = keyword.trim();

        if (keyword.startsWith("www.")) {
            keyword = HTTP + keyword;
        } else if (keyword.startsWith("ftp.")) {
            keyword = "ftp://" + keyword;
        }

        boolean containsPeriod = keyword.contains(".");
        boolean isIPAddress = (TextUtils.isDigitsOnly(keyword.replace(".", ""))
                && (keyword.replace(".", "").length() >= 4) && keyword.contains("."));
        boolean aboutScheme = keyword.contains("about:");
        boolean validURL = (keyword.startsWith("ftp://") || keyword.startsWith(HTTP)
                || keyword.startsWith(FILE) || keyword.startsWith(HTTPS))
                || isIPAddress;
        boolean isSearch = ((keyword.contains(" ") || !containsPeriod) && !aboutScheme);

        if (isIPAddress
                && (!keyword.startsWith(HTTP) || !keyword.startsWith(HTTPS))) {
            keyword = HTTP + keyword;
        }

        String converUrl;
        if (isSearch) {
            /*try {
                keyword = URLEncoder.encode(keyword, "UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }*/
//            converUrl = "http://www.google.com/search?q=" + keyword ;
            return null;
        } else if (!validURL) {
            converUrl = HTTP + keyword;
        } else {
            converUrl = keyword;
        }
        return converUrl;
    }
}