Now its easier to create and share the apk file to test in different environments. In react native we can bundle and release the apk with jus 2 steps.

  1. Create bundle

    If you dont have the assets folder inside the     android\app\src\main , Create it before running the below comment. 

    react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

  2.   Create release

    gradlew assembleDebug

    3. Now your apk file will be ready to share as unsigned under the folder - android\app\build\outputs