I am getting a very puzzling bug that I have no idea how to even begin working through.
I have a simple app with one activity, the views are implemented with Fragments. One of the fragments has a ViewPager inside of it; so I decided I that I wanted to use the getChildFragmentManager class of the v4 support library. I also had to use ActionBarSherlock, which caused a problem, because it does not ship with the v11 of the v4 library.
I fixed this by replacing the v4 support library in ABS with the v11 library, and everything compiled and appeared to be working, including the ViewPager.
Here is the strange part:
The first time the fragment with the ViewPager opens, it works properly; but the SECOND time it is navigated to, the app crashes, giving a useless stack trace. From debugging, I discovered that the problem was with the FragmentManager returned by getChildFragmentManager; it throws the No Activity error.
Does anybody have any idea what could be causing this?
I will post code that you think is relevant.
Thank you, David
I followed the link in jeremyvillalobos answer (which was very helpful) that led me to this workaround.
public class CustomFragment extends Fragment {
private static final Field sChildFragmentManagerField;
static {
Field f = null;
try {
f = Fragment.class.getDeclaredField("mChildFragmentManager");
f.setAccessible(true);
} catch (NoSuchFieldException e) {
Log.e(LOGTAG, "Error getting mChildFragmentManager field", e);
}
sChildFragmentManagerField = f;
}
@Override
public void onDetach() {
super.onDetach();
if (sChildFragmentManagerField != null) {
try {
sChildFragmentManagerField.set(this, null);
} catch (Exception e) {
Log.e(LOGTAG, "Error setting mChildFragmentManager field", e);
}
}
}
...
}
It works for me well, without the need to reinstantiate the fragment.