To create an AAB binary locally using Android Studio:
- Open the Build menu
- Choose Generate Signed Bundle / APK
- Follow the prompts to sign the AAB with your keystore file
For complete details, view the Android documentation.
If you haven't made the switch to Android app bundles yet, you will need to opt into Play App Signing in the Google Play Console to be able to publish them.
First, create a new app in the Google Play Console. In order to enable app signing, you'll need to navigate to the new release screen, on one of the Production, Open testing, closed testing, or internal testing pages.
Select the Create new release button as seen below (it doesn't matter which release type, since you don't have to actually go through with creating a new release right now):
Under the App integrity section, click the Change app signing key button:
Next, select the Export and upload a key from Java Keystore option. This is the only way in which you can retain the key and have Google Play use it for signing. If you're using Appflow to build Android apps in the cloud, this is also the required option so you can upload the keystore file to Appflow.
Follow the instructions on the screen to generate the Keystore and you can use the same Keystore file to sign your app in the Appflow dashboard as well. If you need any help generating the Keystore file, you can refer to our docs here.
Once the generated zip file has been uploaded, you're all set! Build an AAB binary signed with the keystore file then upload it to Google Play.
As of now, existing apps aren't required to use the AAB format, but you can still enroll them using Play App signing.
To opt into app signing, you'll need to upload the app signing key used to sign previous releases of the app. Navigate to Setup -> App integrity, then choose one of the two methods seen in the screenshot below. Once the key has been uploaded, you can enroll in Play App Signing.
With smaller app sizes, improved performance, and enhanced security, the AAB binary format is a win for app developers and users alike. If you have an existing Android app using the APK format, consider migrating to AAB to take advantage of all the great features it provides.
First, the unsigned APK must be signed. If a signing key has already been generated, skip these steps and use that one instead. Generate a private key using the keytool command that comes with the Android SDK:
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
Once that command has been ran and its prompts have been answered a file called my-release-key.keystore will be created in the current directory.
Save this file and keep it somewhere safe. If it is lost the Google Play Store will not accept updates for this app!
To sign the unsigned APK, run the jarsigner tool which is also included in the Android SDK:
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore HelloWorld-release-unsigned.apk alias_name
Finally, the zip align tool must be ran to optimize the APK.
The zipalign tool can be found in /path/to/Android/sdk/build-tools/VERSION/zipalign.
For example, on macOS with Android Studio installed, zipalign is in ~/Library/Android/sdk/build-tools/VERSION/zipalign:
zipalign -v 4 HelloWorld-release-unsigned.apk HelloWorld.apk
This generates a final release binary called HelloWorld.apk that can be accepted into the Google Play Store.