Generating APK react Native

Open CMD with admin rights and navigate to android folder in JAVA jdk
execute
keytool -genkeypair -v -keystore my-upload-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 10000
copy my-upload-key.keystore file into projects android/app

add 
MYAPP_UPLOAD_STORE_FILE=my-upload-key.keystore
MYAPP_UPLOAD_KEY_ALIAS=my-key-alias
MYAPP_UPLOAD_STORE_PASSWORD=*****
MYAPP_UPLOAD_KEY_PASSWORD=*****
into android/gradle.properties

then inside android/app/build.gradle

  signingConfigs {
        release {
            if (project.hasProperty('MYAPP_UPLOAD_STORE_FILE')) {
                storeFile file(MYAPP_UPLOAD_STORE_FILE)
                storePassword MYAPP_UPLOAD_STORE_PASSWORD
                keyAlias MYAPP_UPLOAD_KEY_ALIAS
                keyPassword MYAPP_UPLOAD_KEY_PASSWORD
            }
        }
    }
    buildTypes {
        release {
            ...
            signingConfig signingConfigs.release
        }
    }
   





create Assets folder and index.android.bundle file in 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
cd android
gradlew clean
gradlew assembleRelease -x bundleReleaseJsAndAssets



https://reactnative.dev/docs/signed-apk-android
https://stackoverflow.com/questions/54634072/react-native-signed-release-apk-keeps-crashing-in-device