During the initialization of Gaud map, a bundle object of savedInstanceState is needed. The first button knife is used in the project. This is how I encapsulate the base class. There is no problem

  @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        if (null != rootView) {
            ViewGroup parent = (ViewGroup) rootView.getParent();
            if (null != parent) {
                parent.removeView(rootView);
            }
        } else {
            int layout = getContentView();
            rootView = inflater.inflate(layout, container, false);
        }
        this.mContext = getActivity();
        ButterKnife.bind(this, rootView);
        savedstanceState(savedInstanceState);
        if (useEventBus()) {
            EventBusUtils.register(this);
        }
        refWatcher = BaseApplication.getRefWatcher(getActivity());//leakcanary tool to detect memory leaks in ondestore
        return rootView;

    }

The project uses kotlin. Because kotlin has its own extension, it doesn't need butterKnife, so it cancels butterKnife, thus encapsulating the following

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
//        if (null != rootView) {
//            val parent = rootView?.parent as ViewGroup
//            parent.removeView(rootView)
//        } else {
//        }
        val layout = getContentView()
        rootView = inflater.inflate(layout, container, false)
        this.mContext = context
        savedstanceState(savedInstanceState)
        if (useEventBus()) {
           EventBusUtils.register(context)
        }
        //leakcanary tool to detect memory leaks in ondestore
        refWatcher = LibApplication.getRefWatcher(context)
        return rootView
    }

    open fun savedstanceState(savedInstanceState: Bundle?) {}

    protected abstract fun initData()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        isViewPrepare = true
        initDialog()
        initView(view)
        initData()
        lazyLoadDataIfPrepared()
    }

At this time, the pit will come. After that, configure the map

  override fun savedstanceState(savedInstanceState: Bundle?) {
        mapView?.onCreate(savedInstanceState)
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        mapView?.onSaveInstanceState(outState)
    }

No doubt about the base class at first
Later, I saw the following base class. savedstanceState(savedInstanceState) should not be placed under onCreateView(), but under onViewCreated()

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        isViewPrepare = true
        initDialog()
        initView(view)
        savedstanceState(savedInstanceState)
        initData()
        lazyLoadDataIfPrepared()
    }

So it can be used, and the problem can be solved