毫秒的格式化

14.

    private StringBuilder mFormatBuilder;
    private Formatter mFormatter;

 public MilliseFormat() {
        // 转换成字符串的时间
        mFormatBuilder = new StringBuilder();
        mFormatter = new Formatter(mFormatBuilder, Locale.getDefault());

    }

  /**
     * 把毫秒转换成：1:20:30这样的形式
     *
     * @param timeMs
     * @return
     */
    public String stringForTime(int timeMs) {
        int totalSeconds = timeMs / 1000;
        int seconds = totalSeconds % 60;

        int minutes = (totalSeconds / 60) % 60;

        int hours = totalSeconds / 3600;

        mFormatBuilder.setLength(0);
        if (hours > 0) {
            return mFormatter.format("%d:%02d:%02d", hours, minutes, seconds)
                    .toString();
        } else {
            return mFormatter.format("%02d:%02d", minutes, seconds).toString();
        }
    }