1cd android
2./gradlew assembleRelease

1Before uploading the release build to the Play Store, 
2make sure you test it thoroughly. 
3
4mkdir -p android/app/src/main/assets
5react-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
6react-native run-android --variant=release
7
8Export Apk -
9cd android && ./gradlew bundleRelease -x bundleReleaseJsAndAssets
10
11- Your AAB BUNDLE will be present in the folder
12<project>/android/app/build/outputs/bundle/release