Android获取本周本月本年的第一天和最后一天

获取本周的第一天和最后一天：

SimpleDateFormat dateFormater = new SimpleDateFormat(
"yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_WEEK, 1);
cal.getTime();
start_time.setText(dateFormater.format(cal.getTime()) + "");

cal.set(Calendar.DAY_OF_WEEK,
cal.getActualMaximum(Calendar.DAY_OF_WEEK));
end_time.setText(dateFormater.format(cal.getTime()));

获取本月的第一天和最后一天：

SimpleDateFormat dateFormater = new SimpleDateFormat(
"yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.getTime();
start_time.setText(dateFormater.format(cal.getTime()) + "");

cal.set(Calendar.DAY_OF_MONTH,
cal.getActualMaximum(Calendar.DAY_OF_MONTH));
end_time.setText(dateFormater.format(cal.getTime()));

获取本年的第一天和最后一天：

SimpleDateFormat dateFormater = new SimpleDateFormat(
"yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_YEAR, 1);
cal.getTime();
start_time.setText(dateFormater.format(cal.getTime()) + "");

cal.set(Calendar.DAY_OF_YEAR,
cal.getActualMaximum(Calendar.DAY_OF_YEAR));
end_time.setText(dateFormater.format(cal.getTime()));