ListView未正确展示对应星期的Appointment模型数据问题求助

你遇到的核心问题很明确：更新了数据源mAppointmentList，但没有通知ListView的适配器刷新视图。当切换到周日时，你已经替换了列表内容，但ListView的适配器没有感知到数据变化，仍在使用之前的视图缓存，所以只显示了旧数据的前两条，而非你新增的周日专属时段。

解决方法 #

只需要在更新完mAppointmentList后，调用适配器的notifyDataSetChanged()方法，强制ListView重新渲染最新数据即可。

修改后的完整代码 #

HorizontalCalendar horizontalCalendar = new HorizontalCalendar.Builder(this, R.id.calendarView)
        .startDate(startDate.getTime())
        .endDate(endDate.getTime())
        .build();

horizontalCalendar.setCalendarListener(new HorizontalCalendarListener() {
    @Override
    public void onDateSelected(Date date, int position) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("EEE dd MMM yyyy", Locale.ENGLISH);
        SimpleDateFormat dayFormat = new SimpleDateFormat("EEE", Locale.ENGLISH);
        mDate = date;
        currentDate = dateFormat.format(date);
        String day = dayFormat.format(date);

        if (day.equals("Sun")){
            mAppointmentList.clear();
            mAppointmentList.add(new Appointment("1:00PM", "4:00PM" ,"Book"));
            mAppointmentList.add(new Appointment("4:00PM", "7:00PM" ,"Book"));
        } else {
            mAppointmentList.clear();
            mAppointmentList.add(new Appointment("8:00AM", "11:00AM","Book"));
            mAppointmentList.add(new Appointment("11:00AM", "2:00PM" ,"Book"));
            mAppointmentList.add(new Appointment("2:00PM", "5:00PM" ,"Book"));
            mAppointmentList.add(new Appointment("5:00PM", "8:00PM" ,"Book"));
        }
        // 关键：通知适配器数据已更新，ListView将重新加载最新内容
        yourListViewAdapter.notifyDataSetChanged();
    }

    @Override
    public void onCalendarScroll(HorizontalCalendarView calendarView, int dx, int dy) { }

    @Override
    public boolean onDateLongClicked(Date date, int position) {
        return true;
    }
});

额外注意事项 #

• 请将代码中的yourListViewAdapter替换为你实际使用的ListView适配器对象的变量名
• 确保你的适配器是基于mAppointmentList这个数据源构建的，否则调用notifyDataSetChanged()也不会生效

内容的提问来源于stack exchange，提问作者Raynold