Check if an application is on its first run with F

问题:

Basically, I want to have a screen/view that will open when the user opens up the app for the first time. This will be a login screen type of thing.

回答1:

Use Shared Preferences Package. You can read it with FutureBuilder, and you can check if there is a bool named welcome for example. This is the implementation I have in my code:

return new FutureBuilder<SharedPreferences>(
      future: SharedPreferences.getInstance(),
      builder:
          (BuildContext context, AsyncSnapshot<SharedPreferences> snapshot) {
        switch (snapshot.connectionState) {
          case ConnectionState.none:
          case ConnectionState.waiting:
            return new LoadingScreen();
          default:
            if (!snapshot.hasError) {
              @ToDo("Return a welcome screen")
              return snapshot.data.getBool("welcome") != null
                  ? new MainView()
                  : new LoadingScreen();
            } else {
              return new ErrorScreen(error: snapshot.error);
            }
        }
      },
    );