The specified child already has a parent. You must call removeView() on the child's parent first.

在使用fragmentActivity和fragment时，调用replace时出现Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.错误。

解决办法：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {

View rootView = inflater.inflate(R.layout.fragment_exchange, container,false);