android - 我怎样才能得到 FragmentPagerAdapter 的当前 fragment

Question

public class FolioPageFragmentAdapter extends FragmentStatePagerAdapter{
    private List<SpineReference> mSpineReferences;
    private Book mBook;
    private String mEpubFileName;
    private boolean mIsSmilAvailable;
    private FolioPageFragment mFolioPageFragment;

    public FolioPageFragmentAdapter(FragmentManager fm, List<SpineReference> spineReferences,
                                    Book book, String epubFilename, boolean isSmilAvilable) {
        super(fm);
        this.mSpineReferences = spineReferences;
        this.mBook = book;
        this.mEpubFileName = epubFilename;
        this.mIsSmilAvailable = isSmilAvilable;
    }

    @Override
    public Fragment getItem(int position) {
        mFolioPageFragment = FolioPageFragment.newInstance(position, mBook, mEpubFileName, mIsSmilAvailable);
        return mFolioPageFragment;
    }

    @Override
    public int getCount() {
        return mSpineReferences.size();
    }


    public FolioPageFragment getCurrentFragment(){
         return mFolioPageFragment;
    }
}



 It   doesn't   give   me   the   correct   current   fragment.  

有什么办法可以让我得到当前的 fragment 。我已将 FragmentPagerAdapter 更改为 FragmentStatePagerAdapter。以下方法不提供当前 fragment 。Evert 创建实例时，我将其存储在全局变量中，但它对我不起作用。

private Fragment getFragment(int pos) {
        return getSupportFragmentManager().
                findFragmentByTag("android:switcher:" + R.id.folioPageViewPager + ":" + (pos));
    }

Answer 1

这可能行不通，因为 getItem() 可以返回下一个/上一个 fragment 。尝试制作 fragment 数组，将创建的 fragment 存储在那里并从当前数组中检索。