Fragment already added IllegalStateException

Question

I use this method on my container Activity to show a BFrag ``` public void showBFrag() { // Start a new FragmentTransaction FragmentTransaction fragmentTransaction = mFragmentMgr.beginTransaction(); if(mBFrag.isAdded()) { Log.d(LOG_TAG, "Show() BFrag"); fragmentTransaction.show(mBFrag); } else { Log.d(LOG_TAG, "Replacing AFrag -> BFrag"); fragmentTransaction.replace(R.id.operation_fragments_frame, mBFrag); } // Keep the transaction in the back stack so it will be reversed when backbutton is pressed fragmentTransaction.addToBackStack(null); // Commit transaction fragmentTransaction.commit(); } ``` I call it from my container Activity; for the first time: - gets into the else statement and mBFrag replace mAFrag. Then I press the back button: - and the operation is reversed (mAFrag is shown but.. does mBFrag is removed?). Then I go forward again by calling showBFrag() from the same Activity: - and it gets AGAIN into the else statement. (so I can deduce that mBFrag is NOT ADDED) - but I g…

Accepted Answer

In the end my workaround was to execute remove() of the previous fragment and add() the new one. Although that's what replace() method was meant to do.

But I am still guessing why replace() method didn't work properly in this case. It is really weird and I want to discard that it is because I am misunderstanding something or doing something wrong.

Fragment already added IllegalStateException

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