FragmentStatePagerAdapter instantiates all fragments after updating to ADT 22

Question

My app was working with the android support library rev 12 but when I updated to revision 13, my FragmentStatePagerAdapter started driving me nuts:

My activity:

import android.app.Fragment;
import android.app.FragmentManager;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
...

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mAdapter = new MyAdapter(getFragmentManager());

    mPager = (ViewPager)findViewById(R.id.main_frame_pager);
    mPager.setAdapter(mAdapter);
}

public static class MyAdapter extends FragmentStatePagerAdapter {
    public MyAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public int getCount() {
        return 5;
    }

    @Override
    public Fragment getItem(int position) {
        Log.i(TAG, "getItem() -> New fragment at position " + position);
        switch (position) {
        case 0:
            IdentityFragment idFrag = new IdentityFragment();
            return idFrag;
        case 1:
            SkillFragment skFrag = new SkillFragment();
            return skFrag;
        case 2:
            ExperiencesFragment expFrag2 = new ExperiencesFragment();
            return expFrag2;
        case 3:
            EducationFragment eduFrag = new EducationFragment();
            return eduFrag;
        case 4:
            MiscFragment mFrag = new MiscFragment();
            return mFrag;
        }
        return null;
    }
}

All my fragments are instanciated (LogCat displays "getItem() -> New fragment at position [0 -> 4]") while only 0 and 1 were expected (offscreenPageLimit = 1)

score 2 · Accepted Answer · answered Jul 19 '13 at 08:25

2

Make sure your ViewPager declaration has not a layout_width="0dip". Use this instead :

<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    ...

</android.support.v4.view.ViewPager>

It appeared in the 13rd revision of the support library since they're more strict about what you can do and what you cannot do with the ViewPager.

answered Jul 19 '13 at 08:25

tyxie

36
2

Wow! I would have never thought about that one! Indeed I was using `layout_width="0dip"` along with `android:layout_weight="1"` Thanks a lot! – Mathieu Castets Jul 19 '13 at 08:27
Seems like guys at Google were aware of the issue. Bug has been fixed since revision 18 of the support library (July 2013): "Modified ViewPager to better handle cases where the pager has a measured width of zero in the initial layout processing." – Mathieu Castets Sep 05 '13 at 09:17

FragmentStatePagerAdapter instantiates all fragments after updating to ADT 22

1 Answers1