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android - fragment isInLayout 返回 false

fragment何时应从isInLayout方法返回true?在我的例子中,它返回false,但我可以看到fragment,isVisible和isAdded返回true。在我的ActivityonCreate方法中,我调用了这个:FragmentManagerfragmentManager=getSupportFragmentManager();FragmentTransactiontransaction=fragmentManager.beginTransaction();FragEventListlistFrag=newFragEventList();transaction.re