Android studio获取系统日期 并设置显示出来

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

        /**
         * 如果小时是个位数
         *
         *则在前面价格“0”
         * */
        if (calendar.get(Calendar.HOUR) < 10) {
            mHours = "0" + calendar.get(Calendar.HOUR);
        } else {
            mHours = String.valueOf(calendar.get(Calendar.HOUR));
        }
        /**
         * 如果分钟是个位数
         *
         *则在前面价格“0”
         * */
        if (calendar.get(Calendar.MINUTE) < 10) {
            mMinute = "0" + calendar.get(Calendar.MINUTE);
        } else {
            mMinute = String.valueOf(calendar.get(Calendar.MINUTE));
        }

        /**
         * 获取星期
         * 并设置出来
         * */
        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";
        }