React-Native: Application has not been registered error

Question

I am currently going through the React-Native tutorials. I began with the Getting Started tutorial, where I made a new react native project and successfully managed to run t

Answer 1

After have read all the above, I have found that there could be another reason for this.

In my case:

react-native-cli: 2.0.1

react-native: 0.60.4

and following structure:

First has to be noted that index.android is not been update in Android Studio when the build run by Metro builder( react-native run-android) so it has to be done manually. Also in Android studio does not "read" the

app.json(created by default together with index.js, that renamed index.android.js):

 {
    "name": "authApp",
    "displayName": "authApp"
 }

and so this like

(in my case)

import {authApp as appName} from './app.json';

cause the fact that android studio does not know what authApp refer to. I fix for the moment referring to the app name with its string name and not using that import from app.json:

AppRegistry.registerComponent('authApp', () => MyApp);