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我的日历应用程序有这个问题，这是可以理解的，但我不知道如何解决它！

我有一个用作无限寻呼机的视图寻呼机（页数设置为 3，当我向左或向右滑动时，我会移动页面的内容）。我使用 3 个相同的视图（当天事件的视图）。每个视图/天由事件列表视图表示。listview 有一个用于自定义显示事件的适配器。

我在 viewpager 上实现了 onPageScrollStateChanged。向左（前一天）时，当 onPageScrollStateChanged 设置好时，我将数据从中心一天移到右侧，将左侧的数据移到中心并生成前一天的视图设置到左侧，最后我使用 SetCurrentItem 返回中心（允许无限滚动）。我的问题是列表视图的内容闪烁！我清楚地看到我正在从左侧的页面传递到中心的页面，它们是相同的，但中心页面还没有调用 listview 适配器，所以当我将位置强制为一个时，我的印象是列表在第一次加载时重新加载......（因为它由适配器填充）。我该如何解决这个问题？

有些代码可能更容易理解：

活动类：

DayPagerAdapter dayAdapter;
ViewPager myViewPager;
int focusedPage;

 @Override 
public void onCreate(Bundle savedInstanceState) { 
    super.OnCreate(savedInstanceState);
    setContentView(R.layout.main);

    dayAdapter = new DayAdapter(this);
    myViewPager = (ViewPager) findViewyId(R.id.mypager);
    myViewPager.setAdapter(dayAdapter);

    myViewPager.setOnPageChangeListener(new onPageChangeListener(){
   ....
 @Override
public void onPageScrollStateChanged(int state) { 
if (state == ViewPager.SCROLL_STATE_IDLE) {
if (mFocusedPage == 0) 
{
   View dayBefore = (View) myViewPager.getChildAt(0);
   View dayCurrent = (View) myViewPager.getChildAt(1);
   View dayNext = (View) myViewPager.getChildAt(2);
   View newView = (View) dayAdapter.istantiateItem(myViewPager,0);
  //move data
  ListView lvBef = (ListView) dayBefore.findViewById(R.id.lvDay);
  ListView lCur = (ListView) dayCurrent.findViewById(R.id.lvDay);
  ListView lvNext = (ListView) dayNext.findViewById(R.id.lvDay);
  ListView lvNew = (ListView) newView.findViewById(R.id.lvDay);

  lvNext.setAdapter(lvCur.getAdapter());
  lvCur.setAdapter(lvBef.getAdapter());
  lvBefore.setAdapter(lvNew.getAdapter());

  dayAdapter.notifyDataSetChanged();
}                                    
else if (mFocusedPage == 2)  
{
  ..........
}    
// go back to the center allowing to scroll indefinitely
mDayPager.setCurrentItem(1, false);

ViewPager 适配器类

class DayAdapterextends PagerAdapter  {

ViewPager container;
Context theContext;
LayoutInflater inflater;

public DayAdapter(Context activityContext)
{
theContext = activityContext;
inflater = (LayoutInflater)theContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeViewAt(position);
}

@Override
public void finishUpdate(View container) {

}

@Override
public int getCount() {
return 3;
}

 @Override
public Object instantiateItem(View container, int position) {

    View newview = infater.inflate(R.layout.dayLayout, null);
    ListView lvListViewDay = (ListView) newview.findViewById(R.id.lvDay);
    ArrayList events = getSomeEvents();
    DayEventAdapter dayAdap = new DayEventAdapter(newview.getContext(), events);
    lvListViewDay.setAdapter(adapSat);
    container.addView(newview,position);
    return newview;
}

@Override
public boolean isViewFromObject(View view, Object object) {
 return view == object;
}

@Override
public void restoreState(Parcelable state, ClassLoader loader) {

}   

@Override
public Parcelable saveState() {
  return null;
}

@Override
public void startUpdate(View container) {

}

ListView 适配器类

public class DayEventAdapter extends BaseAdapter 
....
public View getView(int position, View convertView, ViewGroup parent) {

if(convertView == null)
  {
   convertView = layoutInflater.inflate(R.layout.event_cell, null);
  }

  //get the event
  CalendarEvent event = (CalendarEvent) getItem(position);
  if(event != null)
  {
    ((TextView) convertView.findViewById(R.id.tvEventCellEventHour)).setText(event.getEvDate());
    ((TextView) convertView.findViewById (R.id.tvEventCellEventDesc)).setText(event.getEvDesc());
  }
  return convertView;
}

请给我一个帮助，或者如果我的问题不清楚，请不要犹豫！干杯

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0 回答 0