Android java取得实时上周的时间

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Test {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.MONDAY);

        calendar.add(Calendar.DATE, -);
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        Date    sTime = calendar.getTime();
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        Date    eTime = calendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String s = sdf.format(sTime) + " 00:00:00";
        String e = sdf.format(eTime) + " 23:59:59";
        System.out.println(s);
        System.out.println(e);
    }
}