Android Spinner显示周月跨度列表

/**
* 获取周日期列表
*/
public static ArrayList<String> getWeekList(int startId) {
ArrayList<String> list = new ArrayList<String>();
Date today = new Date();
String startDate = "";
String endDate = "";
for (int i = 0; i < 12 + startId; i++) {//12为默认显示的条数
startDate = dateToString(getWeekList(today).get(0));
endDate = dateToString(getWeekList(today).get(6));
Long fTime = today.getTime() - 7 * 24 * 3600000;
today.setTime(fTime);
list.add(startDate + " ~ " + endDate);
}
return list;
}

private static String dateToString(Date mdate) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd");
String strDate = sdf.format(mdate);
return strDate;
}

private static List<Date> dateToWeek(Date mdate) {
int b = mdate.getDay();
Date fdate;
List<Date> list = new ArrayList<Date>();
Long fTime = mdate.getTime() - b * 24 * 3600000;
for (int a = 1; a <= 7; a++) {
fdate = new Date();
fdate.setTime(fTime + (a * 24 * 3600000));
list.add(a - 1, fdate);
}
return list;
}

private static ArrayList<Date> getWeekList(Date mdate) {

ArrayList<Date> days = new ArrayList<>();
days.addAll(dateToWeek(mdate));

Calendar calendar = Calendar.getInstance();
int lastIndex = days.size() - 1;
Date startDay = days.get(0);
Date endDay = days.get(lastIndex);

calendar.setTime(startDay);
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
days.remove(0);
days.add(0, calendar.getTime());

calendar.clear();
calendar.setTime(endDay);
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
days.remove(lastIndex);
days.add(lastIndex, calendar.getTime());

return days;
}

如图：

/*** 根据年月获取该月份的天数** @return*/public static int getDayOfMonth(int year, int month) {Calendar calendar = Calendar.getInstance();calendar.set(Calendar.YEAR, year);calendar.set(Calendar.MONTH, month - 1);int dayOfMonth = calendar.getActualMaximum(Calendar.DATE);return dayOfMonth;}/*** 获取月跨度列表* @param startId* @return*/public static ArrayList<String> getMonthList(int startId) {ArrayList<String> list = new ArrayList<String>();Calendar calendar = Calendar.getInstance();String startDate = "";String endDate = "";int year = calendar.get(Calendar.YEAR);int month = calendar.get(Calendar.MONTH) + 1;for (int i = 0; i < 12 + startId; i++) {//月份显示两位数String strMonth = month < 10 ? "0" + month : "" + month;startDate = year + "." + strMonth + "." + "01";endDate = year + "." + strMonth + "." + getDayOfMonth(year, month);if (month > 1) {month--;} else {year--;month = 12;}list.add(startDate + " ~ " + endDate);}return list;}