log中引发的一个空指针异常

[junixapp]

日志信息：

════════ Exception caught by gesture ═══════════════════════════════════════════════════════════════
The following NoSuchMethodError was thrown while handling a gesture:
The getter 'settings' was called on null.
Receiver: null
Tried calling: settings

When the exception was thrown, this was the stack: 
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      LifecycleObserver.didRemove (package:lifecycle/src/lifecycle_observer.dart:197:41)
#2      _NavigatorRemoveObservation.notify (package:flutter/src/widgets/navigator.dart:2679:14)
#3      List.forEach (dart:core-patch/growable_array.dart:313:8)
#4      NavigatorState._flushObserverNotifications (package:flutter/src/widgets/navigator.dart:3303:27)
...
Handler: "onTap"

具体代码定位到：

/// [route] 被移除的route
  /// [previousRoute] 被移除route下面的route,移除多个route时,该参数值不变
  @override
  void didRemove(Route route, Route previousRoute) {
    super.didRemove(route, previousRoute);
    log('LifecycleObserver($hashCode)#didRemove('
        'route: ${route.settings.name}, '
        'previousRoute: ${previousRoute.settings.name})');

    _sendEventToGivenRoute(route, LifecycleEvent.pop);
    if (previousRoute.isCurrent) {
      _sendEventToGivenRoute(previousRoute, LifecycleEvent.active);
    }

    _routes.remove(route);
  }

打印previousRoute.settings.name时报错的。
我的场景是移除所有router然后pushName一个新的就报错了，使用的方法是pushNamedAndRemoveUntil；
此时previousRoute是null

flutter版本 1.22.4

我把代码修改为下面这样后就可以了：

 void didRemove(Route route, Route previousRoute) {
    super.didRemove(route, previousRoute);
    log('LifecycleObserver($hashCode)#didRemove('
        'route: ${route?.settings?.name}, '
        'previousRoute: ${previousRoute?.settings?.name})');

    _sendEventToGivenRoute(route, LifecycleEvent.pop);
    if (previousRoute?.isCurrent??false) {
      _sendEventToGivenRoute(previousRoute, LifecycleEvent.active);
    }

    _routes.remove(route);
  }

[chenenyu]

谢谢反馈 👍 最晚明天会发一个修复版本

[junixapp]

@chenenyu 0.1.1版本少加一个地方，目前还是报错：

 @override
  void didRemove(Route route, Route previousRoute) {
    super.didRemove(route, previousRoute);
    log('LifecycleObserver($hashCode)#didRemove('
        'route: ${route?.settings?.name}, '
        'previousRoute: ${previousRoute?.settings?.name})');

    _sendEventToGivenRoute(route, LifecycleEvent.pop);
    if (previousRoute.isCurrent) {
      _sendEventToGivenRoute(previousRoute, LifecycleEvent.active);
    }

    _routes.remove(route);
  }

if判断哪里也要加 ?:

if (previousRoute.isCurrent) {
  _sendEventToGivenRoute(previousRoute, LifecycleEvent.active);
}

应修改为：

if (previousRoute?.isCurrent??false) {
  _sendEventToGivenRoute(previousRoute, LifecycleEvent.active);
}

今天能更新个版本吗，有点着急。。。。

[chenenyu]

不好意思 才看到，现在处理下

[chenenyu]

try lifecycle: ^0.1.1+1