Androids: Alexa as the default assistant

The update now allows you to use Alexa as your default voice assistant on just about any Android device.

Before getting started, you’ll need to download the Amazon Alexa app from the Play Store. After the app is installed, you will need to log into your Amazon account to get everything working.

http://www.androidguys.com/2018/05/08/amazon-alexa-galaxy-s9/