In my application I have a View pager that rotates 4 Fragments. Some of those fragments have other fragments inside them. The first time Viewpager starts a Fragment it works fine, but if I rotate around and return to the previous fragment, the inner fragments fail to show ( and I have noticed that getActivity() in them returns null).
For example, the app starts, I move through viewpager and see all the main fragments and they appear fine, then I scroll back, every main fragment that has inner fragments does not show properly.
I use "FragmentStatePagerAdapter" for my ViewPager and the code is below (variables names are for example).
private class ContentPagerAdapter extends FragmentStatePagerAdapter {
public ContentPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public Fragment getItem(int pos) {
Fragment fragment = null;
try {
if (pos == POS1) {
if (fragment1 == null) {
fragment1 = Fragment1.newInstance();
}
fragment = fragment1;
} else if (pos == POS2) {
if (fragment2 == null) {
fragment2 = Fragment2.newInstance(something);
}
fragment = fragment2;
} else if (pos == POS3) {
if ( fragment3 == null ) {
fragment3 = Fragment3.newInstance(something3);
}
fragment = fragment3;
} else { //default
if (fragment4 == null) {
fragment4 = Fragment4.newInstance(something4);
}
fragment = fragment4;
}
}catch (Exception e) {
Log.e(AppConstants.APP_TAG, "Cannot create fragment", e);
finish();
}
return fragment;
}
@Override
public int getCount() {
int count = 4;
return count;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
When instantiating the PagerAdapter, use getChildFragmentManager() instead of getFragmentManager(). If more info needed, similiar problem was solved here ViewPager in TabFragment not loading second time
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