Nested fragments are not supported by current fragment implementation (it was answered by Diane, Android engineer as well here:
Nested fragments are not currently supported. Trying to put a fragment
within the UI of another fragment will result in undefined and likely
broken behavior.
But it does not mean it is not doable - it can be achieved, however requires writing some more code than just fragment. There's comment in same thread by other user:
I managed this by extending FragmentActivity, FragmentManager, and
FragmentTransaction. Basic premise is extend DeferringFragmentActivity
in my activities, providing same api so no other code changes. When I
call getFragmentManager, I get an instance that
DeferringFragmentManager, and when I call beginTransaction, I get a
DeferredTransaction. This transaction stores POJOs with the called
method and arguments. When commit is call, we look for any pending
DeferredTransactions first. Once all transactions have been committed,
we start a real transaction and run all the stored methods with args
In general - unless you are desperated, just redesign your layout.