code: public void setDefaultNumericValue(double defaultNumericValue, final String defaultNumericFormat) {
          mDefaultText = String.format(defaultNumericFormat, defaultNumericValue);
          if (hasCustomDecimalSeparator) {
              // swap locale decimal separator with custom one for display
              mDefaultText = StringUtils.replace(mDefaultText,
                      String.valueOf(DECIMAL_SEPARATOR), String.valueOf(mDecimalSeparator));
          }
  
          setTextInternal(mDefaultText);
      }
docs: Set default numeric value and how it should be displayed, this value will be used if
  {@link #clear} is called
  
  @param defaultNumericValue  numeric value
  @param defaultNumericFormat display format for numeric value