编译报错：
NavigatorState navState = Navigator.of(globalKeyForRouter.currentContext);
List<Route> navHistory = navState.history;
history在flutter1.0及其以上版本已经是私有变量了；
运行时报错：
Field privateField0 = FlutterView.class.getDeclaredField("mDiscoveryReceiver");
mDiscoveryReceiver在新版本引擎中已经不存在该定义了。
编译报错：
NavigatorState navState = Navigator.of(globalKeyForRouter.currentContext);
List<Route> navHistory = navState.history;
history在flutter1.0及其以上版本已经是私有变量了；
运行时报错：
Field privateField0 = FlutterView.class.getDeclaredField("mDiscoveryReceiver");
mDiscoveryReceiver在新版本引擎中已经不存在该定义了。