下面是我的实现，它包含了来自@Bill Phillips的信息 除非数据发生了变化，否则大多数情况下都会使用片段缓存。简单，而且似乎工作得很好。

MyFragmentStatePagerAdapter.java

private boolean mIsUpdating = false;
public void setIsUpdating(boolean mIsUpdating) {
        this.mIsUpdating = mIsUpdating;
    }


@Override
public int getItemPosition(@NonNull Object object) {

    if (mIsUpdating) {
        return POSITION_NONE;
    }
    else {
        return super.getItemPosition(object);
    }
}

MyActivity.java

mAdapter.setIsUpdating(true);
mAdapter.notifyDataSetChanged();
mAdapter.setIsUpdating(false);

对于那些仍然面临同样的问题，我以前遇到的时候，我有一个ViewPager与7个片段。这些片段默认从API服务加载英语内容，但这里的问题是，我想从设置活动和完成后更改语言 设置活动我想ViewPager在主活动刷新片段，以匹配从用户的语言选择和加载阿拉伯语内容，如果用户选择阿拉伯语在这里，我所做的工作从第一次

1-你必须使用FragmentStatePagerAdapter如上所述。

2-在mainActivity我覆盖onResume，并做以下

if (!(mPagerAdapter == null)) {
    mPagerAdapter.notifyDataSetChanged();
}

3-i覆盖了mPagerAdapter中的getItemPosition()，并使其返回POSITION_NONE。

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

工作很有魅力

我遇到过这个问题，今天终于解决了，所以我把我学到的东西写下来，希望对那些刚接触Android ViewPager并像我一样更新的人有帮助。我使用FragmentStatePagerAdapter在API级别17，目前只有2个片段。我想一定有什么地方不对，请指正，谢谢。

Serialized data has to be loaded into memory. This can be done using a CursorLoader/AsyncTask/Thread. Whether it's automatically loaded depends on your code. If you are using a CursorLoader, it's auto-loaded since there is a registered data observer. After you call viewpager.setAdapter(pageradapter), the adapter's getCount() is constantly called to build fragments. So if data is being loaded, getCount() can return 0, thus you don't need to create dummy fragments for no data shown. After the data is loaded, the adapter will not build fragments automatically since getCount() is still 0, so we can set the actually loaded data number to be returned by getCount(), then call the adapter's notifyDataSetChanged(). ViewPager begin to create fragments (just the first 2 fragments) by data in memory. It's done before notifyDataSetChanged() is returned. Then the ViewPager has the right fragments you need. If the data in the database and memory are both updated (write through), or just data in memory is updated (write back), or only data in the database is updated. In the last two cases if data is not automatically loaded from the database to memory (as mentioned above). The ViewPager and pager adapter just deal with data in memory. So when data in memory is updated, we just need to call the adapter's notifyDataSetChanged(). Since the fragment is already created, the adapter's onItemPosition() will be called before notifyDataSetChanged(） returns. Nothing needs to be done in getItemPosition(). Then the data is updated.

而不是从getItemPosition()返回POSITION_NONE并引起完整的视图重建，这样做:

//call this method to update fragments in ViewPager dynamically
public void update(UpdateData xyzData) {
    this.updateData = xyzData;
    notifyDataSetChanged();
}

@Override
public int getItemPosition(Object object) {
    if (object instanceof UpdateableFragment) {
        ((UpdateableFragment) object).update(updateData);
    }
    //don't return POSITION_NONE, avoid fragment recreation. 
    return super.getItemPosition(object);
}

你的片段应该实现UpdateableFragment接口:

public class SomeFragment extends Fragment implements
    UpdateableFragment{

    @Override
    public void update(UpdateData xyzData) {
         // this method will be called for every fragment in viewpager
         // so check if update is for this fragment
         if(forMe(xyzData)) {
           // do whatever you want to update your UI
         }
    }
}

以及界面:

public interface UpdateableFragment {
   public void update(UpdateData xyzData);
}

你的数据类:

public class UpdateData {
    //whatever you want here
}

在代码中的notifyDataSetChanged()之后尝试在ViewPager上销毁drawingcache()。

我尝试了很多不同的方法，但没有一个能真正解决我的问题。下面是我如何用你们提供的混合解决方案来解决这个问题。谢谢每一个人。

class PagerAdapter extends FragmentPagerAdapter {

    public boolean flag_refresh=false;

    public PagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int page) {
        FragmentsMain f;
        f=new FragmentsMain();
        f.page=page;
        return f;
    }

    @Override
    public int getCount() {
        return 4;
    }

    @Override
    public int getItemPosition(Object item) {
        int page= ((FragmentsMain)item).page;

        if (page == 0 && flag_refresh) {
            flag_refresh=false;
            return POSITION_NONE;
        } else {
            return super.getItemPosition(item);
        }
    }

    @Override
    public void destroyItem(View container, int position, Object object) {

        ((ViewPager) container).removeView((View) object);
    }
}

我只想在onResume()后刷新页面0。

 adapter=new PagerAdapter(getSupportFragmentManager());
 pager.setAdapter(adapter);

@Override
protected void onResume() {
    super.onResume();

    if (adapter!=null) {
        adapter.flag_refresh=true;
        adapter.notifyDataSetChanged();
    }
}

在我的FragmentsMain中，有一个公共整数“page”，它可以告诉我这是否是我想要刷新的页面。

public class FragmentsMain extends Fragment {

private Cursor cursor;
private static Context context;
public int page=-1;