Android 中 while 循环的解析日期问题

Question

我目前正在制作一个应用程序原型，该应用程序可根据入住和退房日期计算假期费用。这个想法是，一旦提交了日期，就会运行一个 While 循环，直到到达结账日期。但是，我似乎无法正确解析日历日期。在最近的测试中，我输入了 2015 年 2 月 20 日的入住日期和 2015 年 2 月 22 日的退房日期，两者都在 logcat.

中记录为 1-2-5

这是我正在处理的代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_selection);
    Button btnSubmit = (Button) findViewById(R.id.btnSubmit);
    final DatePicker datePickerCheckIn = (DatePicker) findViewById(R.id.datePickerCheckIn);
    final DatePicker datePickerCheckOut = (DatePicker) findViewById(R.id.datePickerCheckOut);

    final TextView studioTotal = (TextView) findViewById(R.id.studioTotal);
    final TextView oneBedTotal = (TextView) findViewById(R.id.oneBedTotal);
    final TextView twoBedTotal = (TextView) findViewById(R.id.twoBedTotal);
    final TextView villaTotal = (TextView) findViewById(R.id.villaTotal);

    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {

    //Set check in values
            int checkInDay = datePickerCheckIn.getDayOfMonth();
            int checkInMonth = datePickerCheckIn.getMonth();
            checkInMonth = checkInMonth + 1;                
            int checkInYear = datePickerCheckIn.getYear();


    //Set check out values
            int checkOutDay = datePickerCheckOut.getDayOfMonth();
            int checkOutMonth = datePickerCheckOut.getMonth();
            checkOutMonth = checkOutMonth + 1;
            int checkOutYear = datePickerCheckOut.getYear();


    //Reset rates
            studioTotalPoints = 0;
            oneBedTotalPoints = 0;
            twoBedTotalPoints = 0;
            villaTotalPoints = 0;

            final String checkInStart = checkInYear+"-"+checkInMonth+"-"+checkInDay;
            final String checkOutEnd = checkOutYear+"-"+checkOutMonth+"-"+checkOutDay;

            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Calendar dateStart = Calendar.getInstance();
            try {
                dateStart.setTime(sdf.parse(checkInStart));
            } catch (ParseException e) {
                e.printStackTrace();
            }

            Calendar dateEnd = Calendar.getInstance();
            try {
                dateEnd.setTime(sdf.parse(checkOutEnd));
            } catch (ParseException e) {
                e.printStackTrace();
            }

            Log.i("Start Date: ", dateStart.YEAR+"-"+dateStart.MONTH+"-"+dateStart.DAY_OF_MONTH);
            Log.i("End Date: ", dateEnd.YEAR+"-"+dateEnd.MONTH+"-"+dateEnd.DAY_OF_MONTH);

            while (dateStart.DAY_OF_YEAR < dateEnd.DAY_OF_YEAR)
            {
                studioTotalPoints += rateStudioA1;
                oneBedTotalPoints += rate1BedA1;
                twoBedTotalPoints += rate2BedA1;
                villaTotalPoints += rateVillaA1;

                dateStart.add(Calendar.DATE, 1);

                Log.i("Dates", dateStart+"-"+dateEnd);

                totalNights +=1;
            }

            studioTotal.setText(""+studioTotalPoints);
            oneBedTotal.setText(""+oneBedTotalPoints);
            twoBedTotal.setText(""+twoBedTotalPoints);
            villaTotal.setText(""+villaTotalPoints);
        }
    };



    btnSubmit.setOnClickListener(listener);
}

日期从日期选择器到日历的解析方式似乎有问题，但我不确定是什么。

有人有什么建议吗？

Answer 1

尝试这样做：

String checkInStart = checkInYear+"-"+checkInMonth+"-"+checkInDay;
DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 
Date startDate;
try {
    startDate = sdf.parse(checkInStart);
    String newDateString = sdf.format(startDate);
    System.out.println(newDateString);
} catch (ParseException e) {
    e.printStackTrace();
}

正确解析字符串。

Android 中 while 循环的解析日期问题

Issues parsing dates for a while loop in Android

android

calendar

date

while-loop