java.lang.IllegalStateException: The specified child already has a parent. You must call removeView(

public class BeatBoxFragment extends Fragment {
  ......
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
      //这里的false不能省略
    View view = inflater.inflate(R.layout.fragment_beat_box, container, false);
    ......
    return view;
  }
  }
  ......
  ......
}

上面的false不能省略，否则就会抛出如下异常：

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

因为itemView已经被添加到另一个父类里了，如果这里再将false省略，那就是默认将itemView添加到container，一个子项不允许添加到两个父类容器中。这一点跟Java FX中的节点是一致的。