Using .env variables in android/MainApplication.java file?

[ATypescriptEnjoyer]

Hi,

Is there any detailed way of using the .env file and building it into either the BuildConfig.java or using the files directly in a different way? Any help is appreciated :)

[ATypescriptEnjoyer]

Used this instead: https://github.com/luggit/react-native-config

[brendonhc]

Used this instead: https://github.com/luggit/react-native-config

Thanks! This library is perfect for that! Before I was using the react-native-dotenv to import my .env file inside my js code, but, now I need that my MainApplication.java code import the .env file too and I Can't do this with react-native-dotenv lib.

My solution was to use both libs, react-native-dotenv to my JS code, and react-native-config to java code (native).

For any who would find the solution is easy:

1. First install the react-native-library:

yarn add react-native-config
react-native link react-native-config

2. PRINCIPAL STEP: Add inside your MainApplication.java file this code where you need to use the environment var:

   // example, here I added the code inside onCreate() method of my MainApplication class
   public void onCreate() {
   String VAR_WITH_ANY_NAME = BuildConfig.ANY_ENV_VAR_AS_YOU_WANT;
   // ... any code ...
   }

3. Now, rebuild your project (I like to do it in different terminals, one for the bundle and another for build)

   • Init your js bundle

     yarn && yarn start --reset-cache

   • recompile your native project

     yarn run android

I recommend to read react-native-config README.md with most updated doc: https://github.com/luggit/react-native-config#native-usage