You can generate a private signing key using
keytool. On Windows
keytool must be run from
This command prompts you for passwords for the keystore and key, and to provide the Distinguished Name fields for your key. It then generates the keystore as a file called
The keystore contains a single key, valid for 10000 days. The alias is a name that you will use later when signing your app, so remember to take note of the alias.
Note: Remember to keep your keystore file private and never commit it to version control.
my-release-key.keystorefile under the
android/appdirectory in your project folder.
android/gradle.propertiesand add the following (replace
*****with the correct keystore password, alias and key password),
These are going to be global gradle variables, which we can later use in our gradle config to sign our app.
Note about saving the keystore:
Once you publish the app on the Play Store, you will need to republish your app under a different package name (losing all downloads and ratings) if you want to change the signing key at any point. So backup your keystore and don't forget the passwords.
Note about security: If you are not keen on storing your passwords in plaintext and you are running OSX, you can also store your credentials in the Keychain Access app. Then you can skip the two last rows in
Edit the file
android/app/build.gradle in your project folder and add the signing config,
Simply run the following in a terminal:
android/app/build.gradle to see how you can update it to reflect these changes.
The generated APK can be found under
android/app/build/outputs/apk/app-release.apk, and is ready to be distributed.
Before uploading the release build to the Play Store, make sure you test it thoroughly. First uninstall any previous version of the app you already have installed. Install it on the device using:
--variant=release is only available if you've set up signing as described above.
By default, the generated APK has the native code for both x86 and ARMv7a CPU architectures. This makes it easier to share APKs that run on almost all Android devices. However, this has the downside that there will be some unused native code on any device, leading to unnecessarily bigger APKs.
You can create an APK for each CPU by changing the following line in android/app/build.gradle:
Upload both these files to markets which support device targetting, such as Google Play and Amazon AppStore and the users will automatically get the appropriate APK. If you want to upload to other markets such as APKFiles, which do not support multiple APKs for a single app, change the following line as well to create the default universal APK with binaries for both CPUs.
Proguard is a tool that can slightly reduce the size of the APK. It does this by stripping parts of the React Native Java bytecode (and its dependencies) that your app is not using.
IMPORTANT: Make sure to thoroughly test your app if you've enabled Proguard. Proguard often requires configuration specific to each native library you're using. See
To enable Proguard, edit
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