build Gradle Key Store

buildGradleKeyStore

android {
....
  signingConfigs {
    release {
      storeFile file('your_key_name.keystore')
      storePassword 'your_key_store_password'
      keyAlias 'your_key_alias'
      keyPassword 'your_key_file_alias_password'
    }
  }
  buildTypes {
    release {
      ....
      signingConfig signingConfigs.release
    }
  }
}