日历和PagerAdapter - 无限浏览 [英] Calendar and PagerAdapter - Unlimited Views
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问题描述
在我的活动，我使用ViewPager刷卡左/右相应的显示和月视图。我是从的onCreate 传递月份和年份的PagerAdapter：
私有静态诠释NUM_AWESOME_VIEWS = 3;
viewPager =（ViewPager）v.findViewById（R.id.pager）;
cAdapter =新CalendarPagerAdapter（this.getActivity（）getApplicationContext（），DATE_VALUE，fragmentManager，月，年）;
viewPager.setAdapter（cAdapter）;
viewPager.setOffscreenPageLimit（3）;
日历始于十一月，然后滚动至一月。我想日历显示无限的意见前进和后退。
PagerAdapter：
公共CalendarPagerAdapter（上下文的背景下，INT DV，FragmentManager FM，月，年整型）{
this.context =背景;
this.dv = DV;
this.fm = FM;
this.month =月;
this.year =年;
}
公共对象instantiateItem（查看收集，INT位置）{
Log.d（对象，实例化）;
LayoutInflater充气=（LayoutInflater）collection.getContext（）
.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
视图V = inflater.inflate（R.layout.simple_calendar_view，NULL）;
_calendar.set（Calendar.MONTH，月）;
_calendar.set（Calendar.YEAR，一年）;
一个月= _calendar.get（Calendar.MONTH）+ 1;
年= _calendar.get（Calendar.YEAR）;
currentMonth =（按钮）v.findViewById（R.id.currentMonth）;
currentMonth.setText（hijri.getMonthForInt（月-1）.toUpperCase（）++年）;
calendarView =（GridView控件）v.findViewById（R.id.calendar）;
calendarWeek =（GridView控件）v.findViewById（R.id.calendarweek）;
calendarWeek.setAdapter（新CalendarWeekAdapter（上下文，firstDay））;
//初始化
适配器=新GridCellAdapter（calendarView，上下文，R.id.calendar_day_gridcell，月，年，0，0，0）;
adapter.notifyDataSetChanged（）;
calendarView.setAdapter（适配器）;
（（ViewPager）集合）.addView（V，0）;
返回伏;
}
，这就是我来了，但是当所述viewpager的位置为0或2，页变为空白，然后显示下月+ 1（即，后余滚动一月，页面闪烁，并显示3月）。不能平稳滚动。我不知道怎么回事，要做到这一点。
viewPager.setOnPageChangeListener（新OnPageChangeListener（）{
@覆盖
公共无效onPageScrolled（INT位置，浮positionOffset，诠释positionOffsetPixels）{
}
@覆盖
公共无效onPageScrollStateChanged（INT状态）{
如果（国家== ViewPager.SCROLL_STATE_IDLE）
Log.d（日历ViewPager，日历ViewPager+ viewPager.getCurrentItem（））;
如果（focusedPage == 0）{
_calendar.add（Calendar.MONTH，-1）;
月= _calendar.get（Calendar.MONTH）;
年= _calendar.get（Calendar.YEAR）;
setGridCellAdapter（上下文，月，年）;
}否则如果（focusedPage == 2）{
_calendar.add（Calendar.MONTH，+ 1）;
月= _calendar.get（Calendar.MONTH）;
年= _calendar.get（Calendar.YEAR）;
setGridCellAdapter（上下文，月，年）;
}
viewPager.setCurrentItem（1，假）;
}
}
@覆盖
公共无效onPageSelected（INT位置）{
focusedPage =位置;
}
}）;
公共无效setGridCellAdapter（上下文CTX，INT月，年整型）
{
cAdapter =新CalendarPagerAdapter（CTX，DATE_VALUE，fragmentManager，月，年）;
Log.d（对象，重新instantiatted+月+年）;
cAdapter.notifyDataSetChanged（）;
viewPager.setAdapter（cAdapter）;
}
解决方案
我必须做到实现这一点，但不是完全用在每一页的3个片段。当用户迅速向左或向右，它会重新设置为中，更新的新数据源的每个片段。
在主
MonthViewContentFragment [] fragList =新MonthViewContentFragment [3];
fragList [0] = MonthViewContentFragment.newInstance（prevMonth）;
fragList [1] = MonthViewContentFragment.newInstance（currentMonth）;
fragList [2] = MonthViewContentFragment.newInstance（nextMonth）;
ViewPager monthPage =（ViewPager）v.findViewById（R.id.monthview_content）;
MonthPageAdapter monthPageAdapter =新MonthPageAdapter（getFragmentManager（），fragList）;
monthPage.setAdapter（monthPageAdapter）;
monthPage.setOnPageChangeListener（本）;
monthPage.setCurrentItem（1，假）;
在 onPageScrollStateChanged
如果（国家== ViewPager.SCROLL_STATE_IDLE）{
如果（focusPage＆LT; PAGE_CENTER）{
currentMonth.add（Calendar.MONTH，-1）;
}否则如果（focusPage＆GT; PAGE_CENTER）{
currentMonth.add（Calendar.MONTH，1）;
}
monthPageAdapter.setCalendar（currentMonth）;
monthPage.setCurrentItem（1，假）;
updateTitle（）;
}
在 onPageSelected
公共无效onPageSelected（INT位置）{
// TODO自动生成方法存根
focusPage =位置;
}
在MonthPageAdapter
MonthViewContentFragment [] fragList;
MonthViewContentFragment温度;
INT fragNumber = 3;
公共MonthPageAdapter（FragmentManager FM，MonthViewContentFragment [] fragList）{
超（FM）;
this.fragList = fragList;
}
@覆盖
公众诠释getItemPosition（Object对象）{
// TODO自动生成方法存根
返回POSITION_NONE;
}
@覆盖
公共片段的getItem（INT位置）{
返回fragList [位置]
}
@覆盖
公众诠释getCount将（）{
返回3;
}
公共无效setCalendar（日历currentMonth）{
日历prevMonth = Calendar.getInstance（）;
prevMonth.setTime（currentMonth.getTime（））;
prevMonth.add（Calendar.MONTH，-1）;
日历nextMonth = Calendar.getInstance（）;
nextMonth.setTime（currentMonth.getTime（））;
nextMonth.add（Calendar.MONTH，1）;
//更新所有3个片段
fragList [0] .updateUI（prevMonth）;
fragList [1] .updateUI（currentMonth）;
fragList [2] .updateUI（nextMonth）;
}
在MonthViewContentFragment
@覆盖
方法public void updateUI（日历monthYear）{
视图V = getView（）;
如果（V == NULL）
返回;
// setNewDataSource calcurate新的名单，其中，字符串＆GT;日期
calendarViewAdapter.setNewDataSource（monthYear）;
calendarViewAdapter.notifyDataSetChanged（）;
}
这是不完美的，因为当用户迅速太快。滚动不改变闲置但随后 ViewPager 到达其终点。
In my activity, I'm using ViewPager to swipe left/right and show month view accordingly. I'm passing the month and year values from onCreate to the PagerAdapter:
private static int NUM_AWESOME_VIEWS = 3;
viewPager = (ViewPager) v.findViewById(R.id.pager);
cAdapter = new CalendarPagerAdapter(this.getActivity().getApplicationContext(), date_value, fragmentManager, month, year);
viewPager.setAdapter(cAdapter);
viewPager.setOffscreenPageLimit(3);
The Calendar starts from November and then scrolls till January. I would like the Calendar to display unlimited views forward and backward.
PagerAdapter:
public CalendarPagerAdapter(Context context, int dv, FragmentManager fm, int month, int year){
this.context = context;
this.dv = dv;
this.fm = fm;
this.month = month;
this.year = year;
}
public Object instantiateItem(View collection, int position) {
Log.d("Object", "Instantiated");
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.simple_calendar_view, null);
_calendar.set(Calendar.MONTH, month);
_calendar.set(Calendar.YEAR, year);
month = _calendar.get(Calendar.MONTH) + 1;
year = _calendar.get(Calendar.YEAR);
currentMonth = (Button) v.findViewById(R.id.currentMonth);
currentMonth.setText(hijri.getMonthForInt(month-1).toUpperCase() + " " + year);
calendarView = (GridView) v.findViewById(R.id.calendar);
calendarWeek = (GridView) v.findViewById(R.id.calendarweek);
calendarWeek.setAdapter(new CalendarWeekAdapter(context, firstDay));
// Initialised
adapter = new GridCellAdapter(calendarView, context, R.id.calendar_day_gridcell, month, year, 0, 0, 0);
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
((ViewPager) collection).addView(v, 0);
return v;
}
Based on Jon Willis' code, this is what I have come up with, but when the position of the viewpager is 0 or 2, the page goes blank and then displays the next month + 1 (that is, after I scroll January, the page flickers and displays March). It does not scroll smoothly. I am not sure how else to do it.
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageScrollStateChanged(int state) {
if (state == ViewPager.SCROLL_STATE_IDLE)
Log.d("Calendar ViewPager", "Calendar ViewPager" + viewPager.getCurrentItem());
if (focusedPage == 0) {
_calendar.add(Calendar.MONTH, -1);
month = _calendar.get(Calendar.MONTH);
year = _calendar.get(Calendar.YEAR);
setGridCellAdapter(context, month, year);
} else if (focusedPage == 2) {
_calendar.add(Calendar.MONTH, +1);
month = _calendar.get(Calendar.MONTH);
year = _calendar.get(Calendar.YEAR);
setGridCellAdapter(context, month, year);
}
viewPager.setCurrentItem(1, false);
}
}
@Override
public void onPageSelected(int position) {
focusedPage = position;
}
});
public void setGridCellAdapter(Context ctx, int month, int year)
{
cAdapter = new CalendarPagerAdapter(ctx, date_value, fragmentManager, month, year);
Log.d("Object", "Re-instantiatted" + month + year);
cAdapter.notifyDataSetChanged();
viewPager.setAdapter(cAdapter);
}
解决方案
I have achieve to implement this but not perfectly by using each page as 3 fragments. When User swift right or left, It will set back to middle and update new data source for each fragment.
In Main
MonthViewContentFragment[] fragList = new MonthViewContentFragment[3];
fragList[0] = MonthViewContentFragment.newInstance(prevMonth);
fragList[1] = MonthViewContentFragment.newInstance(currentMonth);
fragList[2] = MonthViewContentFragment.newInstance(nextMonth);
ViewPager monthPage = (ViewPager) v.findViewById(R.id.monthview_content);
MonthPageAdapter monthPageAdapter = new MonthPageAdapter(getFragmentManager(), fragList);
monthPage.setAdapter(monthPageAdapter);
monthPage.setOnPageChangeListener(this);
monthPage.setCurrentItem(1, false);
in onPageScrollStateChanged
if (state == ViewPager.SCROLL_STATE_IDLE) {
if (focusPage < PAGE_CENTER) {
currentMonth.add(Calendar.MONTH, -1);
} else if (focusPage > PAGE_CENTER) {
currentMonth.add(Calendar.MONTH, 1);
}
monthPageAdapter.setCalendar(currentMonth);
monthPage.setCurrentItem(1, false);
updateTitle();
}
in onPageSelected
public void onPageSelected(int position) {
// TODO Auto-generated method stub
focusPage = position;
}
In MonthPageAdapter
MonthViewContentFragment[] fragList;
MonthViewContentFragment temp;
int fragNumber = 3;
public MonthPageAdapter(FragmentManager fm, MonthViewContentFragment[] fragList) {
super(fm);
this.fragList = fragList;
}
@Override
public int getItemPosition(Object object) {
// TODO Auto-generated method stub
return POSITION_NONE;
}
@Override
public Fragment getItem(int position) {
return fragList[position];
}
@Override
public int getCount() {
return 3;
}
public void setCalendar(Calendar currentMonth) {
Calendar prevMonth = Calendar.getInstance();
prevMonth.setTime(currentMonth.getTime());
prevMonth.add(Calendar.MONTH, -1);
Calendar nextMonth = Calendar.getInstance();
nextMonth.setTime(currentMonth.getTime());
nextMonth.add(Calendar.MONTH, 1);
//update all 3 fragments
fragList[0].updateUI(prevMonth);
fragList[1].updateUI(currentMonth);
fragList[2].updateUI(nextMonth);
}
In MonthViewContentFragment
@Override
public void updateUI(Calendar monthYear) {
View v = getView();
if (v == null)
return;
//setNewDataSource calcurate new List<String> date
calendarViewAdapter.setNewDataSource(monthYear);
calendarViewAdapter.notifyDataSetChanged();
}
This is not perfect because when user swift too fast. The scroll is not change to idle yet then ViewPager reach its end.
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