FlutterBoostActivity不会立即调用，需要过几秒钟

[yahooyee]

混合开发的时候，返回到原生页面，FlutterBoostActivity的onStop，onDestroy需要过几秒钟，才会调用，导致flutter的dispose不调用，要等下次push的时候才调用

2022-07-12 13:52:51.652 18458-18458/com.exam D/FlutterBoostActivity: #onBackPressed: com.exam.flutter.activity.FlutterRouterActivity@ba8a798 2022-07-12 13:52:51.693 18458-18458/com.exam D/FlutterBoostActivity: #finishContainer: com.exam.flutter.activity.FlutterRouterActivity@ba8a798 2022-07-12 13:52:51.718 18458-18458/com.exam D/FlutterBoostActivity: #onPause: com.exam.flutter.activity.FlutterRouterActivity@ba8a798, isOpaque=false

2022-07-12 13:52:58.091 18458-18458/com.exam D/FlutterBoostActivity: #onStop: com.exam.flutter.activity.FlutterRouterActivity@ba8a798 2022-07-12 13:52:58.095 18458-18458/com.exam D/FlutterBoostActivity: start #onDestroy: com.exam.flutter.activity.FlutterRouterActivity@ba8a798 2022-07-12 13:52:58.109 18458-18458/com.exam D/FlutterBoostActivity: #performDetach: com.exam.flutter.activity.FlutterRouterActivity@ba8a798 2022-07-12 13:52:58.114 18458-18458/com.exam D/FlutterBoostActivity: end #onDestroy: com.exam.flutter.activity.FlutterRouterActivity@ba8a798