Reading static variable during its initialization => Flutter Navigator.push

Question

I have a list of statefull widget which I use to navigate from pages. but when I was trying to push these List element in Navigator.push(), it says "Reading static variable during its initialization".

here's the list:

List<ActionScreen> fullBodyNavigation = [
          ActionScreen(title: 'demo data', number: 20, gifDirectory: "assets/gifs/demodata.gif", currentList: fullBodyNavigation,
              frameMin: 0, frameMax: 17, milisecondAnimation: 800, milisecondTimer: 800, sessionNumber: 1,),
          ActionScreen(title: 'demodata', number: 15, gifDirectory: "assets/gifs/demodata.gif", currentList: fullBodyNavigation,
              frameMin: 0, frameMax: 30, milisecondAnimation: 1200, milisecondTimer: 1200, sessionNumber: 2,),
          ActionScreen(title: 'demodata', number: 15, gifDirectory: "assets/gifs/demodata.gif", currentList: fullBodyNavigation,
              frameMin: 0, frameMax: 2, milisecondAnimation: 2000, milisecondTimer: 2000, sessionNumber: 3,),
          .............
        ]

here's the push method:

onPress: () {
      Navigator.push(context, MaterialPageRoute(builder: (context) => fullBodyNavigation[0],),);
},

I foud a solution in stackoverflow which said I have to use 'data' such as "fullBodyNavigation.data[0]". but ide said "getter data is not defined". can anyone pls help?

here's that solution's link: Reading static variable during its initialization | Flutter

Sisir · Accepted Answer · 2020-07-13 11:54:15Z

The problem is in the way you have created the navigation pages list:

    List<ActionScreen> fullBodyNavigation = [
        ActionScreen(title: 'demo data', 
          number: 20, 
          gifDirectory: "assets/gifs/demodata.gif", 
          currentList: fullBodyNavigation,
          frameMin: 0, 
          frameMax: 17,
          milisecondAnimation: 800, 
          milisecondTimer: 800, 
          sessionNumber: 1,
        ),
        .............
    ]

Why do you want to pass currentList: fullBodyNavigation to ActionScreen. So basically, you are trying to access the list inside the list itself. The chicken and egg problem. THat's what compiler is warning you with the error.

To fix this, dont pass currentList: fullBodyNavigation to ActionScreen. Instead make fullBodyNavigation a static field and in ActionScreen just access it with the class name. That should do your thing and also make the compiler happy

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