如何在React Native中做更好的路由和应用程序结构？(How to do better routing and app structure in React Native?)

 我是一名Java Android开发人员，最近一直在尝试使用React Native。 我一直在研究的东西类似于Android Java代码的导航。 
 
 首先，我想要使用SplashScreen。 然后检查用户是否已登录，然后将用户带入应用程序或登录屏幕。 
 
 现在，要实现这一点，我需要知道用户是否已登录。我该怎么做？ 我不想在index.js中维护全局变量，也不希望index.js成为中央路由系统。 我可以存储一个标志，表明用户已经登录，以及登录用户的访问令牌是什么？ 
 
 我能够在本机Java代码中很好地可视化，但没有弄清楚如何在React Native中做。 

I'm a Java Android developer and been experimenting with React Native lately. What I've been looking into is something similar to the navigation as that of Android Java code. 
 
First, I want to get to SplashScreen. Then check if the user is logged inor not, then take the user into the app or to the login screen. 
 
Now, to achieve this, I need to know if the user is logged in. How do I do that? I don't want to maintain global variables in index.js nor do I want index.js to be the central routing system. Can I store somewhere a flag that says that the user is already logged in, and what's the access-token of the logged in user? 
 
I'm able to visualize this well in native Java code, but failing to figure out how to do in React Native.

原文：https://stackoverflow.com/questions/42423792