# Build and release an Android app

### Signing the app <a href="#signing-the-app" id="signing-the-app"></a>

To publish on the Play Store, you need to give your app a digital signature. Use the following instructions to sign your app.

#### Create a keystore <a href="#create-a-keystore" id="create-a-keystore"></a>

If you have an existing keystore, skip to the next step. If not, create one by running the following at the command line:

On Mac/Linux, use the following command:

```
keytool -genkey -v -keystore ~/key.jks -keyalg RSA -keysize 2048 -validity 10000 -alias key
```

On Windows, use the following command:

```
keytool -genkey -v -keystore c:\Users\USER_NAME\key.jks -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 -alias key
```

This command stores the `key.jks` file in your home directory. If you want to store it elsewhere, change the argument you pass to the `-keystore` parameter. **However, keep the `keystore` file private; don’t check it into public source control!**

#### Reference the keystore from the app <a href="#reference-the-keystore-from-the-app" id="reference-the-keystore-from-the-app"></a>

**Go to** `<app dir>/android/key.properties` change your keystore reference:

![](https://3055596817-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MFydntNulzdMw3Es2MW%2F-MFzPtK6JEJ-k0Kcg2w4%2F-MFzT0IERwiSGwDZXzOq%2Fscreenshot_21.png?alt=media\&token=d4b95c80-9a2a-4532-9c6d-19fefc1a8599)

### Building the app for release <a href="#building-the-app-for-release" id="building-the-app-for-release"></a>

**command line for appbundle:**

1. Enter `cd <app dir>`\
   (Replace `<app dir>` with your application’s directory.)
2.

````
```
````

````
flutter build appbundle --release
```
````

The release bundle for your app is created at `<app dir>/build/app/outputs/bundle/release/app.aab`.


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