在使线性布局容器无效后未调用子视图的 ondraw()

Question

我正在编写一个日历视图。当我按下下个月按钮时，我调用了 mCalendarContainerLL.invalidate();但是我的自定义视图没有被重绘。我的自定义视图中的 onDraw 方法没有被调用。

Ps：如果我直接使所有日历单元格视图无效。它可以工作。 为什么会这样？？？

代码如下：

private CalendarWidgetDayCell updateCalendarView() {

        CalendarWidgetDayCell dayCellSelected = null;
        boolean isSelected = false;

        final boolean isHasSelection = (mCalendarSelected.getTimeInMillis() != 0);

        final int selectedYear = mCalendarSelected.get(Calendar.YEAR);
        final int selectedMonth = mCalendarSelected.get(Calendar.MONTH);
        final int selectedDay = mCalendarSelected.get(Calendar.DAY_OF_MONTH);

        Calendar dateXOfCalendar = Calendar.getInstance();
        dateXOfCalendar.setTimeInMillis(mStartDateCurrentMonth.getTimeInMillis());

        Log.d(tag, "updateCalendarView cpt_func_ " + "mDayCellList.size(): " + mDayCellList.size());
        for (int i = 0; i < mDayCellList.size(); i++) {
            final int yearOfCellItem = dateXOfCalendar.get(Calendar.YEAR);
            final int monthOfCellItem = dateXOfCalendar.get(Calendar.MONTH);
            final int dayOfCellItem = dateXOfCalendar.get(Calendar.DAY_OF_MONTH);
            final int dayOfWeekOfCellItem = dateXOfCalendar.get(Calendar.DAY_OF_WEEK);
            CalendarWidgetDayCell dayCellItem = mDayCellList.get(i);

            boolean isToday = false;
            if (mCalendarToday.get(Calendar.YEAR) == yearOfCellItem) {
                if (mCalendarToday.get(Calendar.MONTH) == monthOfCellItem) {
                    if (mCalendarToday.get(Calendar.DAY_OF_MONTH) == dayOfCellItem) {
                        isToday = true;
                    }
                }
            }

            // check holiday
            boolean isHoliday = false;
            if ((dayOfWeekOfCellItem == Calendar.SATURDAY) || (dayOfWeekOfCellItem == Calendar.SUNDAY))
                isHoliday = true;
            if ((monthOfCellItem == Calendar.JANUARY) && (dayOfCellItem == 1))
                isHoliday = true;

            isSelected = false;
            if (isHasSelection) {
                if ((selectedDay == dayOfCellItem) && (selectedMonth == monthOfCellItem)
                        && (selectedYear == yearOfCellItem)) {
                    isSelected = true;
                }
            }
            dayCellItem.setSelected(isSelected);

            boolean hasRecord = false;

            if (isSelected)
                dayCellSelected = dayCellItem;

            dayCellItem.setViewParam(yearOfCellItem, monthOfCellItem, dayOfCellItem, isToday, isHoliday,
                    mCurrentMonthInCalendar, hasRecord);

            dayCellItem.invalidate();//It works well.
            dateXOfCalendar.add(Calendar.DAY_OF_MONTH, 1);
        }

        // mCalendarContainerLL.invalidate();//This is not working as expected.
        return dayCellSelected;
    }

Answer 1

如果在布局级别调用invalidate()，则布局决定必须重绘它的哪些部分。因此，它仅在受影响/脏的子视图上调用invalidate()。对一个单元格的任何更改对布局都是不可见的，因此布局看不到使任何子级无效的必要性。

当需要重绘视图时，您应该让视图本身失效。在您的情况下，我会在 setParamView 方法中添加对 invalidateSelf() 的调用。据我了解的代码，这是负责将一个单元格装饰为日历中的一天的方法。