java.lang.IllegalStateException:The specified child already has a parent.

就是在fragment中的onCreateView方法中

override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {    return inflater!!.inflate(R.layout.fragment_flight_telemetry_1, container)}

该方法的返回值调用错误，如果按照上面这样写，一般来说会报这个错误

override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {    return inflater!!.inflate(R.layout.fragment_flight_telemetry_1, container, false)}

这样写就不会了，原因暂时我还不太清楚