:app:mergeDexRelease React-native signed apk code example

Example 1: export apk react native

Before uploading the release build to the Play Store, 
make sure you test it thoroughly. 

mkdir -p android/app/src/main/assets
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
react-native run-android --variant=release

Export Apk -
cd android && ./gradlew bundleRelease -x bundleReleaseJsAndAssets

- Your AAB BUNDLE will be present in the folder
<project>/android/app/build/outputs/bundle/release

Example 2: build apk react native

$ keytool -genkeypair -v -keystore my-upload-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 10000