android获取今天周几的示例

public static String getWeekDay(int off) {
String result = new String("");
final Calendar instance = Calendar.getInstance();
instance.setTimeInMillis(System.currentTimeMillis());
int day = instance.get(Calendar.DAY_OF_WEEK);
int offDay = day + off;
switch (offDay % 7) {
case 0:
result = "周六";
break;
case 1:
result = "周日";
break;
case 2:
result = "周一";
break;
case 3:
result = "周二";
break;
case 4:
result = "周三";
break;
case 5:
result = "周四";
break;
case 6:
result = "周五";
break;
}
return result;
}