How can i get current Fragment of FragmentPageAdapter

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.

Is there any way so that i can get the current Fragment. I have changed the FragmentPagerAdapter to FragmentStatePagerAdapter. The below method doesn't give the current Fragment. Evert time the instance is created i'm storing it in the global variable still it does not work for me.

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

Check answer with "makeFragmentName" here: [Retrieve a Fragment from a ViewPager](http://stackoverflow.com/questions/8785221/retrieve-a-fragment-from-a-viewpager) — Roman Kolomenskii, Dec 12 '16 at 11:08

score 1 · Answer 1 · answered Dec 12 '16 at 10:52

1

This probably don't work, because getItem() can return next/previous fragment. Try to make array of fragments, store there created fragments and retrieve from array current.

answered Dec 12 '16 at 10:52

Tomasz Czura

2,414
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score 1 · Answer 2 · answered Dec 12 '16 at 10:56

The problem is that the FragmentStatePagerAdapter has a different loading that you've expected to have.

When it's loaded and set a position it will load: the fragment at position - 1, fragment at position, fragment at position + 1. So in your case the global variable will hold the fragment at position+1.
When you swipe, the last loaded fragment will be position - 1 or position + 1 depending on the scroll direction.

What you should do, is to keep a HashMap with the position & the fragment for that position. Then based on the current position you'll query the HashMap and return the fragment.

You should also detect swipe/page changes and remove destroyed fragments from the HasMap so it won't keep reference to them, thus memory issues.

How can i get current Fragment of FragmentPageAdapter

2 Answers2