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我有一个基于 SherlockFragment 的片段，其中包括一个通过 FragmentStatePagerAdapter 与片段一起操作的 ViewPager。我实现了“无限”滚动，因此适配器返回 getCount() 1000。它可以工作。当我用另一个数据替换（）来自主活动的主片段时出现问题，这个主片段的 onCreateView 在第一次初始化期间调用：我重新创建适配器并将其设置为 ViewPager，运行 notifyDataSetChanged（）并设置相关视图设置当前项（）。此时我没有看到 Fragment，因为 getItem() 没有被调用。如果我向左或向右滑动 ViewPager，则显示中间的第三个片段，然后一切正常，即 getItem() 仅在滑动期间被调用：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_timebar, container, false);      
    mPager = (ViewPager)view.findViewById(R.id.timebar_pager);
    mTitleIndicator = (TitlePageIndicator)view.findViewById(R.id.timebar_titles);

    mPagerAdapter = new MyAdapter(container.getContext(), getSherlockActivity().getSupportFragmentManager(), mPager);
    mPager.setAdapter(mPagerAdapter);
mPagerAdapter.setDate(mStartDate, mPagerAdapter.MIDDLE_POSITION);
    return view;
 }

 public class MyAdapter extends FragmentStatePagerAdapter {
    public final int FULL_COUNT = 1000;
    private final int MIDDLE_POSITION = FULL_COUNT/2;
    private long mMiddleFragmentDate;
    private ViewPager mViewPager;

    public MyAdapter(Context context, FragmentManager fragmentManager, ViewPager viewPager)
    {
      super(fragmentManager);
      mMiddleFragmentDate = mStartDate;
      mViewPager = viewPager;
    }

    public long getMiddlePosDate()
    {
      return mMiddleFragmentDate;
    }

    private void refreshData(int position)
    {
      Log.d("TIMEBAR","@@@@@ refreshData pos=" + position); 
      mViewPager.setCurrentItem(position);
      notifyDataSetChanged();
      View localView = mViewPager.findViewWithTag(Integer.valueOf(position));         
      if (localView != null)
      {
        Log.d("TIMEBAR","@@@@@ refreshData localView found & != null");  
        localView.invalidate();
      }
      mTitleIndicator.notifyDataSetChanged();
    }

    public Calendar getDateByPosition(int position)
    {
      Calendar cal = Calendar.getInstance();
      cal.setTimeInMillis(mMiddleFragmentDate);       
      cal.add(Calendar.DAY_OF_YEAR, (position - MIDDLE_POSITION) * mNumOfDaysPerView);
      return cal;
    }


    @Override
    public void destroyItem(ViewGroup viewGroup, int position, Object object)
    {
      super.destroyItem(viewGroup, position, object);
    }

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

    @Override
    public Fragment getItem(int position)
    {
      GregorianCalendar cal = (GregorianCalendar)getDateByPosition(position);
      return TimebarFragment.newInstance(position, cal.getTimeInMillis(), mNumOfDaysPerView);
    }

    @Override
    public int getItemPosition(Object paramObject)
    {
      return POSITION_NONE;
    }

    @Override
    public CharSequence getPageTitle(int position)
    {
        Calendar cal = getDateByPosition(position);
        StringBuilder sb = new StringBuilder();
        sb.append(mCalendarUtils.getDayOfMonth(cal));
        sb.append(" ");
        if (mNumOfDaysPerView > 1) {
            sb.append(mCalendarUtils.getMonthNameShort(cal));
        } else {
            sb.append(mCalendarUtils.getMonthNameLong(cal));
        }
        if (mNumOfDaysPerView > 1) {
            sb.append(" - ");           
            cal.add(Calendar.DAY_OF_YEAR, mNumOfDaysPerView - 1); 
            sb.append(mCalendarUtils.getDayOfMonth(cal));
            sb.append(" ");
            sb.append(mCalendarUtils.getMonthNameShort(cal));
        }           
        if (calNow.get(Calendar.YEAR) != cal.get(Calendar.YEAR)) {
            sb.append(",");
            sb.append(cal.get(Calendar.YEAR));
        }               
        return sb.toString();
    }

    public void setDate(long date, int position)
    {
      mMiddleFragmentDate = date;
      refreshData(position);
    }
  }
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1 回答 1

3

最后使用android-support-v13库代替android-support-v4库并使用getChildFragmentManager()代替getSupportFragmentManager()解决了所有这些问题。现在：

  • 重新加载主片段会导致在寻呼机中重新加载相关片段（调用 onCreateView()）

  • 同时实例化多个 ViewPager 实例没有问题。

于 2013-02-17T08:34:15.477 回答