问题一：

    java.lang.RuntimeException: Unable to start activity ComponentInfo{包名/包名.flutter_page.CeshiActivity}: 
    java.lang.IllegalArgumentException: Parameter specified as non-null is null: method a.b.a.b.b, parameter savedInstanceState
    Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method a.b.a.b.b, parameter savedInstanceState
    最终问题直指：super.onCreate(savedInstanceState)

问题原因：

    查看源码java： protected void onCreate(@Nullable Bundle savedInstanceState) {}
    savedInstanceState为可空对象
    然而kotlin ：override fun onCreate(savedInstanceState: Bundle?) {}
    savedInstanceState为不可空对象

解决问题：

    override fun onCreate(savedInstanceState: Bundle?) {
        if(savedInstanceState==null){
            super.onCreate(Bundle())
        }else{
            super.onCreate(savedInstanceState)
        }
    }