ViewPager fragments disappear when change screen rotation

It looks like your main activity is using the getSupportFragmentManager() while your fragment is using getFragmentManager().

Not sure if this is worthy of an answer post but my rating is too low to reply any other way. :)

Edit: I believe you may also need to extend a FragmentActivity with the support library.

See: https://stackoverflow.com/a/10609839/2640693

Edit 2:

public class MainActivityFragment extends FragmentActivity {
    private ViewPager mPager = null;
    private PagerAdapter mPageAdapter = null;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View reVal = inflater.inflate(R.layout.activity_main, container, false);
        mPager = (ViewPager) reVal.findViewById(R.id.pagerMainContent);
        mPageAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
        mPager.setAdapter(mPageAdapter);
        return reVal;
    }

    private MainGridViewFragment mainGridFragment;
    private AlphabetGridViewFragment alphabetGridFragment;

    private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
        public ScreenSlidePagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
                case 1:
                    mainGridFragment = new MainGridViewFragment();
                    return (Fragment)mainGridFragment;
                case 0:
                    alphabetGridFragment = new AlphabetGridViewFragment();
                    return (Fragment)alphabetGridFragment;
                default:
                    return null;
            }
        }

        @Override
        public int getCount() {
            return 2;
        }
    }
}

I tried many solution but get success in any one. At last I fixed as below:

• Use getActivity().getSupportFragmentManager() rather than getChildFragmentManager()

• Override getItemId(int position) method in your ViewPagerAdapter class like below:

  @Override
  public long getItemId(int position) {
      return System.currentTimeMillis();
  }
  

For me it's working like charm, please also comment here your view.

For the ones that are having problems with this you can try this:

private void InitializeUI(){
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);

}

@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.activity_exame2);
InitializeUI();
}

i spent 2 days around this problem this was the only thing that worked for me, remeber to add android:configChanges="screenSize|orientation" to your activity in manifest