https://facebook.github.io/react-native/docs/signed-apk-android.html
Edit ~/.gradle/gradle.properties to configure the keystore
COOPCYCLE_RELEASE_STORE_FILE=my-release-key.keystore
COOPCYCLE_RELEASE_KEY_ALIAS=my-key-alias
COOPCYCLE_RELEASE_STORE_PASSWORD=*****
COOPCYCLE_RELEASE_KEY_PASSWORD=*****
Copy the keystore in android/app/
Generate a signed APK
cd android/
./gradlew clean && ./gradlew assembleRelease
Signed APK file can be found in android/app/build/outputs/apk/release/app-release.apk
For further testing, you can install the signed APK on the emulator.
If you have installed the debug APK, you have to uninstall it first.
cd $ANDROID_HOME/platform-tools
./adb install app-release.apk