Release Android

Navigate to that directory by using the command $ cd /android/app and use the keytool command with sudo permission as shown below

$ sudo keytool -genkey -v -keystore my-release-key.keystore -alias my-key-alias -keyalg RSA -keysize

Edit the file android/gradle.properties, and add the following (replace ***** with the correct keystore password, alias and key password)

MYAPP_RELEASE_STORE_FILE=my-release-key.keystore
MYAPP_RELEASE_KEY_ALIAS=my-key-alias
MYAPP_RELEASE_STORE_PASSWORD=*****
MYAPP_RELEASE_KEY_PASSWORD=*****

$ react-native run-android --variant=release

Please try this $./gradlew clean if some problem happen

The generated APK can be found under android/app/build/outputs/apk/release/app-release.apk, and is ready to be distributed.

Full doc https://facebook.github.io/react-native/docs/signed-apk-android

Usefull doc https://themanifest.com/app-development/how-publish-app-google-play-step-step-guide