Generate Signed App Bundle for android

1.Create an upload keystore

1.Command Line:

For Mac:

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

In above upload is alias name this will be your path /upload-keystore.jks

For Windows:

keytool -genkey -v -keystore %userprofile%\upload-keystore.jks ^ -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 ^ -alias upload

2. Android Studio through create :

1.Click on Build > Generate Signed/APK

2.Dialog appears

Select Android App Bundle and click on Next

3.On Key store path click Create new.

4.Fill required fields

Click Next

Select release and Click on Create

2.Reference the keystore from the app

Create a file named [project]/android/key.properties

Code in key.properties:

storePassword=<password-from-previous-step>
keyPassword=<password-from-previous-step>
keyAlias=upload
storeFile=<keystore-file-location>

Configure signing in gradle

Open [project]/android/app/build.gradle

Add following code in gradle:

def keystoreProperties = new Properties()
   def keystorePropertiesFile = rootProject.file('key.properties')
   if (keystorePropertiesFile.exists()) {
       keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
   }

signingConfigs {
       release {
           keyAlias keystoreProperties['keyAlias']
           keyPassword keystoreProperties['keyPassword']
           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
           storePassword keystoreProperties['storePassword']
       }
   }
   buildTypes {
       release {
           signingConfig signingConfigs.release
       }
   }

Now run command in terminal : flutter build appbundle

You will get your output in:

build/app/outputs/bundle/release/app-release.aab (17.6MB).