Generating the Android APK

Building the Android Application Package (APK) is a bit more cryptic than releasing for iOS. There are a few steps that we need to follow before we generate the static bundle, like we did in iOS:

First, we need to generate a key that we can use to sign our application using keytool. Navigate to the android/app folder in a terminal and run this command:
```
$ keytool -genkey -v -keystore my-release-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 10000
[Storing my-release-key.keystore]
```
Note
Note that this is a private file and should never be shared with anyone. Keep it somewhere safe!
Next we have a few configuration files to update. Up a level in the android/ directory open gradle.properties and add these four lines, replacing YOUR_KEY_PASSWORD with the password you used for keytool:
```
MYAPP_RELEASE_STORE_FILE=my-release-key.keystore MYAPP_RELEASE_KEY_ALIAS=my-key-alias MYAPP_RELEASE_STORE_PASSWORD=YOUR_KEY_PASSWORD
MYAPP_RELEASE_KEY_PASSWORD= YOUR_KEY_PASSWORD
```

Add the following in android/app/build.gradle:

android {
    ...

    signingConfigs {
        release {
            storeFile file(MYAPP_RELEASE_STORE_FILE)
            storePassword MYAPP_RELEASE_STORE_PASSWORD
            keyAlias MYAPP_RELEASE_KEY_ALIAS
            keyPassword MYAPP_RELEASE_KEY_PASSWORD
        }
    }
    buildTypes {
        release {
            ...
            signingConfig signingConfigs.release
        }
    }
}

Now, we can generate the static bundle for Android. Create a new directory android/app/src/main/assets/ and run this modified form of the react-native bundle command:

react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

This gives the following output:

$ react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/
Building package...
transforming [========================================] 100% 326/326
Build complete
Successfully saved bundle to android/app/src/main/assets/index.android.bundle

Build the final APK in the android/ directory using the gradle command:
```
./gradlew assembleRelease
```
If you have set up the key signing correctly, you can test your release in the simulator or on a device with the following:
```
./gradlew installRelease
```
With this, we have our final release APK (that can be found in android/app/build/outputs/apk/app-release.apk). Check out the launch checklist on Android developers for more information on the Play Store submission process at https://developer.android.com/distribute/tools/launch-checklist.html.

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Generating the Android APK

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Generating the Android APK