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flutter - 使用 Navigator 时，如何解决在 null 上调用了“ancestorStateOfType”方法？

问题描述

我正在使用 firebase_dynamic_links: ^0.5.0 在我的颤振应用程序中实现设置密码功能。当管理员创建用户时，用户会收到一封电子邮件。在这封电子邮件中有一个动态链接。点击它后，如果他/她没有应用程序，用户将被重定向到 1.App 商店/Play 商店。2.如果应用程序已经安装，在应用程序中打开设置密码屏幕。firebase_dynamic_links 提供了两种方法：- 1.getInitialLink 未来检索打开应用程序的链接。2.onLink 一个回调来监听应用程序处于活动状态或后台时打开的链接。

当应用程序处于终止状态并按下链接时一切顺利，但是当应用程序处于后台时，导航不起作用。

void main() => runApp(MaterialApp(
    theme: new ThemeData(
      primaryColor: Colours.appThemeColour,
    ),
    onGenerateRoute: (RouteSettings settings) {
      switch (settings.name) {
        case '/': return new MyCustomRoute(
          builder: (_) => new SplashScreen(),
          settings: settings,
        );
        case '/setpassword': return new MyCustomRoute(
          builder: (_) => new SetPassword(settings.arguments),
          settings: settings,
        );
     ...


      }
    }
)
);

class SplashScreen extends StatefulWidget {

  @override
  _SplashScreenState createState() => new _SplashScreenState();
}
class _SplashScreenState extends State<SplashScreen> {
Uri deepLink;


  _handleDeepLink(Uri deepLink) async{
    if (deepLink != null) {
      print("querParam=${deepLink.queryParameters["token"]}");
      if(deepLink.queryParameters["otp"].toString()=="1"){
        if(deepLink.queryParameters["token"]!=null){
          String _status =await _networkUtil.verifyUser(deepLink.queryParameters["token"].toString());
            Navigator.of(context).pushReplacementNamed('/setpassword',arguments: _status );


        }else{
          Navigator.of(context).pushReplacementNamed('/setpassword',arguments: "unknownError" );
        }
      }
      else{
        if(deepLink.queryParameters["token"]!=null){
          String _status =await _networkUtil.verifyUser(deepLink.queryParameters["token"].toString());
          SchedulerBinding.instance.addPostFrameCallback((_) {
            Navigator.of(context).pushReplacementNamed('/resetpassword');
          });
        }else{
          Navigator.of(context).pushReplacementNamed('/resetpassword');
        }
      }

    }
  }
}
  initDynamicLinks() async {

    final PendingDynamicLinkData data = await FirebaseDynamicLinks.instance.getInitialLink();
    final Uri deepLink = data?.link;

    if (deepLink != null) {
      _handleDeepLink(deepLink);

    }

    FirebaseDynamicLinks.instance.onLink(
        onSuccess: (PendingDynamicLinkData dynamicLink) async {
          final Uri deepLink = dynamicLink?.link;
          _handleDeepLink(deepLink);

        },
        onError: (OnLinkErrorException e) async {
          print('onLinkError');
          print(e.message);
        }
    );
  }
@override
initState(){
initDynamicLinks().then((){
...

});
}

当应用程序在后台并单击链接时，它应该导航到设置密码屏幕，但它（通过我在下面提到的一个例外）进入当应用程序移动到后台时打开的那个屏幕。

D/ViewRootImpl@5c26021MainActivity：MSG_WINDOW_FOCUS_CHANGED 0 D/SurfaceView(25703)：Relayout 返回：oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x5 surface={Surface( name=null)/@0x54b5e07 isValid=false 0} D/ViewRootImpl@5c26021MainActivity：mHardwareRenderer.destroy()#1 D/ViewRootImpl@5c26021MainActivity：Relayout 返回：oldFrame=[0,0][1440,2560] newFrame=[0 ,0][1440,2560] result=0x5 surface={isValid=false 0} surfaceGenerationChanged=true D/InputTransport(25703): 输入通道被破坏: fd=92 D/ViewRootImpl@5c26021MainActivity: mHardwareRenderer.destroy()#1 D /ViewRootImpl@5c26021MainActivity：Relayout 返回：oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x1 surface={isValid=false 0} surfaceGenerationChanged=false D/ViewRootImpl@ 5c26021MainActivity：mHardwareRenderer。destroy()#1 D/ViewRootImpl@5c26021MainActivity：Relayout 返回：oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x1 surface={isValid=false 0} surfaceGenerationChanged =false D/SurfaceView(25703): Relayout 返回: oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x7 surface={Surface(name=null)/@ 0x54b5e07 isValid=true 543154356736} D/mali_winsys(25703): EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBolean) 返回 0x3000, [1440x2560]-3:1/70 格式): querParam=e144efdbd666e615a47ebe18e25a556d D/ViewRootImpl@5c26021MainActivity: Relayout 返回： oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x7 surface={isValid=true 542519654912} surfaceGeneration =true D/ViewRootImpl@5c26021MainActivity：mHardwareRenderer。initialize() mSurface={isValid=true 542519654912} hwInitialized=true D/mali_winsys(25703): EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBoolean) 返回 0x3000, [1440x2]-5格式：1 D/ViewRootImpl@5c26021MainActivity：MSG_WINDOW_FOCUS_CHANGED 1 D/ViewRootImpl@5c26021MainActivity：mHardwareRenderer.initializeIfNeeded()#2 mSurface={isValid=true 542519654912} V/InputMethodManager(25703)：开始输入：tba=android.view.inputmethod。 EditorInfo@6fb193a nm：com.root.amployee ic=null I/InputMethodManager(25703)：[IMM] startInputInner - mService.startInputOrWindowGainedFocus D/InputTransport(25703)：输入通道构造：fd=93EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBolean) 返回 0x3000, [1440x2560]-format:1 D/ViewRootImpl@5c26021MainActivity: MSG_WINDOW_FOCUS_CHANGED 1 D/ViewRootImpl@5c26021MainActivity: mHardwareRenderer.initialize={mHardwareRenderer.initializeIfisValided=true) 542519654912} V/InputMethodManager(25703): 开始输入: tba=android.view.inputmethod.EditorInfo@6fb193a nm: com.root.amployee ic=null I/InputMethodManager(25703): [IMM] startInputInner - mService.startInputOrWindowGainedFocus D/ InputTransport(25703)：输入通道构造：fd=93EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBolean) 返回 0x3000, [1440x2560]-format:1 D/ViewRootImpl@5c26021MainActivity: MSG_WINDOW_FOCUS_CHANGED 1 D/ViewRootImpl@5c26021MainActivity: mHardwareRenderer.initialize={mHardwareRenderer.initializeIfisValided=true) 542519654912} V/InputMethodManager(25703): 开始输入: tba=android.view.inputmethod.EditorInfo@6fb193a nm: com.root.amployee ic=null I/InputMethodManager(25703): [IMM] startInputInner - mService.startInputOrWindowGainedFocus D/ InputTransport(25703)：输入通道构造：fd=93initializeIfNeeded()#2 mSurface={isValid=true 542519654912} V/InputMethodManager(25703)：开始输入：tba=android.view.inputmethod.EditorInfo@6fb193a nm：com.root.amployee ic=null I/InputMethodManager(25703) ：[IMM] startInputInner - mService.startInputOrWindowGainedFocus D/InputTransport(25703)：输入通道构造：fd=93initializeIfNeeded()#2 mSurface={isValid=true 542519654912} V/InputMethodManager(25703)：开始输入：tba=android.view.inputmethod.EditorInfo@6fb193a nm：com.root.amployee ic=null I/InputMethodManager(25703) ：[IMM] startInputInner - mService.startInputOrWindowGainedFocus D/InputTransport(25703)：输入通道构造：fd=93

E/flutter（25703）：[错误：flutter/lib/ui/ui_dart_state.cc（148）]未处理的异常：NoSuchMethodError：方法'ancestorStateOfType'被调用为null。E/flutter（25703）：接收者：null E/flutter（25703）：尝试调用：ancestStateOfType（'TypeMatcher'的实例） E/flutter（25703）：#0 Object.noSuchMethod（dart：core-patch/object_patch.dart :50:5)

标签： flutterdartfirebase-dynamic-links

解决方案

这是图书馆本身的问题。因为context目前无法访问您访问的内容。所以我建议你在你的MaterialAppor中创建全局导航器状态CupertinoApp

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _navigatorKey = GlobalKey<NavigatorState>();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      key: _navigatorKey,
      home: Container(),
    );
  }
}

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