react-native-android-config v0.0.1

Config variables for React Native apps in Android

Module to expose config variables set in Gradle to your javascript code in React Native.

Bringing some 12 factor love to your mobile apps.

Usage

Declare config variables in Gradle, under android/app/build.gradle:

android {
    defaultConfig {
      buildConfigField "String",  "API_URL",     '"https://myapi.com"'
      buildConfigField "Boolean", "SHOW_ERRORS", "true"
      ...

Then access those from javascript:

var Config = require('react-native-android-config');

Config.API_URL     // "https://myapi.com"
Config.SHOW_ERRORS // true

More on Gradle and configs

In case you're wondering how to keep secrets outside your source: create android/config.properties:

API_URL="https://:secret@myapi.com"

Then load it from build.gradle like:

defaultConfig {
    def props = new Properties()
    props.load(new FileInputStream(rootProject.file('config.properties')))
    props.each { key, val -> buildConfigField "String", key, val }
}

You can do something similar under release in buildTypes to read a different set of credentials from another file.

Setup

1. Include this module in android/settings.gradle:

   include ':react-native-android-config'
   include ':app'
   
   project(':react-native-android-config').projectDir = new File(rootProject.projectDir,
     '../node_modules/react-native-android-config/android')

2. Add a dependency to your app build in android/app/build.gradle:

   dependencies {
       ...
       compile project(':react-native-android-config')
   }

3. Change your main activity to add a new package, in android/app/src/main/.../MainActivity.java:

   import com.lugg.ReactConfig.ReactConfigPackage; // add import
   
   public class MainActivity extends Activity implements DefaultHardwareBackBtnHandler {
   
       private ReactInstanceManager mReactInstanceManager;
       private ReactRootView mReactRootView;
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           mReactRootView = new ReactRootView(this);
   
           // initialize our PhotoRequest handler
           mPhotoRequest = new ReactPhotoRequestPackage(this);
   
           mReactInstanceManager = ReactInstanceManager.builder()
                   .setApplication(getApplication())
                   .setBundleAssetName("index.android.bundle")
                   .setJSMainModuleName("index.android")
                   .addPackage(new MainReactPackage())
                   .addPackage(new ReactConfigPackage()) // add the package here