Unable to instantiate Fragment

Question

Unable to instantiate fragment make sure class name exists, is public, and has an empty constructor that is public

Is it because my Fr

Answer 1

Using setRetainInstance(true) worked for us. Our inner classes now look like this:

public class SectionsPagerAdapter extends FragmentPagerAdapter {
    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
    // getItem is called to instantiate the fragment for the given page.
        Fragment fragment = new MySectionFragment();
        Bundle args = new Bundle();
        args.putInt(MySectionFragment.ARG_SECTION_NUMBER, position + 1);
        fragment.setArguments(args);
        fragment.setRetainInstance(true);
        return fragment;
    }
    // ...
}

public class MySectionFragment extends Fragment {
    public static final String ARG_SECTION_NUMBER = "section_number";
    @SuppressLint("ValidFragment")
    public MySectionFragment() {
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //...
    }       
    // ...
}

PS. Here's an interesting one about setRetainInstance(boolean): Understanding Fragment's setRetainInstance(boolean)