Android studio獲取系統日期 並設置顯示出來

Calendar calendar = Calendar.getInstance();
        mMonth = String.valueOf(calendar.get(Calendar.MONTH) + 1);        //獲取日期的月
        mDay = String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));      //獲取日期的天
        mWay = String.valueOf(calendar.get(Calendar.DAY_OF_WEEK));      //獲取日期的星期

        /**
         * 如果小時是個位數
         *
         *則在前面價格“0”
         * */
        if (calendar.get(Calendar.HOUR) < 10) {
            mHours = "0" + calendar.get(Calendar.HOUR);
        } else {
            mHours = String.valueOf(calendar.get(Calendar.HOUR));
        }
        /**
         * 如果分鍾是個位數
         *
         *則在前面價格“0”
         * */
        if (calendar.get(Calendar.MINUTE) < 10) {
            mMinute = "0" + calendar.get(Calendar.MINUTE);
        } else {
            mMinute = String.valueOf(calendar.get(Calendar.MINUTE));
        }

        /**
         * 獲取星期
         * 並設置出來
         * */
        if ("1".equals(mWay)) {
            mWay = "天";
        } else if ("2".equals(mWay)) {
            mWay = "一";
        } else if ("3".equals(mWay)) {
            mWay = "二";
        } else if ("4".equals(mWay)) {
            mWay = "三";
        } else if ("5".equals(mWay)) {
            mWay = "四";
        } else if ("6".equals(mWay)) {
            mWay = "五";
        } else if ("7".equals(mWay)) {
            mWay = "六";
        }