Question

我没有在我的代码中使用任何列表视图，我使用了适配器类来制作自定义日历。以前，它工作正常。但是，由于我需要为从数据库检索的任何特殊日期实现背景图像，我编写了代码，但现在getView（）方法自动调用多次。
如果有人知道如何阻止它，请建议我任何解决方案......
谢谢。

代码是：

private static final int FIRST_DAY_OF_WEEK = Calendar.MONDAY;
private final Calendar calendar;
public final CalendarItem today;
private final CalendarItem selected;
private final LayoutInflater inflater;

//added
public static CalendarItem eventDate;
//added
private CalendarItem[] days;
Context context;
private List<Events> eventList;
private String dateRetrived;
private String dataRetrived;
private int d;
private int day1;
private String dayS;
private String intMonth;
private String year;
private List<Events> eventList1;
private String dateRetrived1;
private String dataRetrived1;
private Date date1;
private List<Events> dateListInDb;
private String dateOfEvent;


public CalendarAdapter(Context context, Calendar monthCalendar) {
    calendar = monthCalendar;
    today = new CalendarItem(monthCalendar);
    selected = new CalendarItem(monthCalendar);
    eventDate = new CalendarItem(monthCalendar);
    calendar.set(Calendar.DAY_OF_MONTH, 1);
    inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.context = context;
}

public int getCount() {
    return days.length;
}

public Object getItem(int position) {
    return days[position];
}

public long getItemId(int position) {
    final CalendarItem item = days[position];
    if (item != null) {
        return days[position].id;
    }
    return -1;
}

@SuppressLint("SimpleDateFormat")
@SuppressWarnings("static-access")
public View getView(int position, View view, ViewGroup parent) {
    if (view == null) {
        view = inflater.inflate(R.layout.calender_item, null);

    }
        Toast.makeText(context, "view starts ", Toast.LENGTH_SHORT).show();

        final TextView dayView = (TextView)view.findViewById(R.id.date);
        final CalendarItem currentItem = days[position];



        method();


        Toast.makeText(context, "out ", Toast.LENGTH_SHORT).show();


        //for now any date... event dates will be taken from DB.. 

        if (currentItem == null) {
            dayView.setClickable(false);
            dayView.setFocusable(false);
            view.setBackgroundDrawable(null);
            dayView.setText(null);
        } else {
            if(currentItem.equals(today)) {
                view.setBackgroundResource(R.drawable.today_background);
            }

            else if (currentItem.equals(selected)) {
                view.setBackgroundResource(R.drawable.selected_background);
                //  Toast.makeText(context, "tapped",Toast.LENGTH_LONG).show();

            } else {
                view.setBackgroundResource(R.drawable.calnormalmdpi1);
            }
            dayView.setText(currentItem.text);

    }
    return view;

}



private void method() {
    DatabaseManager db = new DatabaseManager(context);

    DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    dateListInDb = db.getAllDates();
    Iterator<Events> iter = dateListInDb.iterator();

    for (int j = 0 ; j < dateListInDb.size() ; j++) {


        Toast.makeText(context, "loop starts " + j, Toast.LENGTH_SHORT).show();

        Events dateOfEvent = iter.next();


        String dateOfEventSingle = dateOfEvent.getDateOfEvent();
        try {
            date1 = formatter.parse(dateOfEventSingle);
            dayS = (String) android.text.format.DateFormat.format("dd", date1); 
            intMonth = (String) android.text.format.DateFormat.format("MM", date1); //06
            year = (String) android.text.format.DateFormat.format("yyyy", date1);
            eventDate = new CalendarItem(Integer.parseInt(year), Integer.parseInt(intMonth)-1,Integer.parseInt(dayS));


        } catch (ParseException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();

        } 


        Toast.makeText(context, "loop ends " + j, Toast.LENGTH_SHORT).show();

        //i = false;
    }

}

public final void setSelected(int year, int month, int day) {
    selected.year = year;
    selected.month = month;
    selected.day = day;
    notifyDataSetChanged();
}

public final void refreshDays() {
    final int year = calendar.get(Calendar.YEAR);
    final int month = calendar.get(Calendar.MONTH);
    Toast.makeText(context, "Date : " + month, Toast.LENGTH_SHORT).show();

    final int firstDayOfMonth = calendar.get(Calendar.DAY_OF_WEEK);
    final int lastDayOfMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
    final int blankies;
    final CalendarItem[] days;

    if (firstDayOfMonth == FIRST_DAY_OF_WEEK) {
        blankies = 0;
    } else if (firstDayOfMonth < FIRST_DAY_OF_WEEK) {
        blankies = Calendar.SATURDAY - (FIRST_DAY_OF_WEEK - 1);
    } else {
        blankies = firstDayOfMonth - FIRST_DAY_OF_WEEK;
    }
    days = new CalendarItem[lastDayOfMonth + blankies];

    for (int day = 1, position = blankies; position < days.length; position++) {
        days[position] = new CalendarItem(year, month, day++);//added dates


    }


    this.days = days;
    notifyDataSetChanged();
}




public static class CalendarItem {
    public int year;
    public int month;
    public int day;
    public String text;
    public long id;

    public CalendarItem(Calendar calendar) {
        this(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
    }

    public CalendarItem(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
        this.text = String.valueOf(day);
        this.id = Long.valueOf(year + "" + month + "" + day);
    }

    @Override
    public boolean equals(Object o) {
        if (o != null && o instanceof CalendarItem) {
            final CalendarItem item = (CalendarItem)o;
            return item.year == year && item.month == month && item.day == day;
        }
        return false;
    }
}    }

Answer 1

引用安卓工程师RomainGuy

This is not an issue, there is absolutely no guarantee on the order in which getView() will be called nor how many times.

因此，您可以处理的最好方法是正确地重复使用现有视图（行布局）。

这是另一篇好文章。

来源：ListView - getView is called too much times

http://developer.android.com/reference/android/widget/GridView.html - 正如你在这里看到的，GridView是一些ListView。它扩展了AbsListView，所以我敢打赌工作流程有点相同。

为什么getView（）方法会自动多次调用？

1 个答案: