How to generate release apks

1. Create an upload keystore

Running the following at the command line:

On Mac/Linux, use the following command:

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

On Windows, use the following command:

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

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2. Reference the keystore from the app

Create a file named [project]/android/key.properties that contains a reference to your keystore:

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3. Copy below code, Paste in to key.propertirs file and change as per shown in image.

storePassword=<password from previous step>
keyPassword=<password from previous step>
keyAlias=upload 
storeFile=location of the key store file, such as /Users/user name/upload-keystore.jks

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4. Configure signing in gradle

Configure gradle to use your upload key when building your app in release mode by editing the [project]/android/app/build.gradle file.

Add the below keystore information from your properties file before the android block:

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

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Find the buildTypes block, and replace it with the following signing configuration info:

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

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5. Run following commands in Terminal as per your need:

To generate an APK: flutter build apk
To generate an App Bundle: flutter build appbundle

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