my android text helper : strike text, underline, decimal format

gistfile1.java

public class TextHelper {
    public static SpannableString strikeText(String text){
        if (text==null)text = "";
        SpannableString str = new SpannableString(text);
        str.setSpan(new StrikethroughSpan(), 0, str.length(), Spanned.SPAN_PARAGRAPH);
        return str;
    }
    public static SpannableString underlineText(String text){
        if (text==null)text = "";
        SpannableString str = new SpannableString(text);
        str.setSpan(new UnderlineSpan(), 0, str.length(), Spanned.SPAN_PARAGRAPH);
        return str;
    }
    public static String decimalFormat(float v){
        return new DecimalFormat("@@##").format(v);
    }
    public static String getCurrentTimeString() {
        SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//dd/MM/yyyy
        Date now = new Date();
        String strDate = sdfDate.format(now);
        return strDate;
    }
}