This April, Google launched custom voice actions on Google Android, allowing users to control select third-party apps simply by starting with the “Ok Google” command.
Today, Google Now functionality has expanded to messaging apps, including WhatsApp, WeChat, NextPlus, Telegram, and Viber.
If you already use “Ok Google” and your voice to send emails, Hangouts, or text messages, this should be a natural progression. You can split the task into two, or just do it all in one go.
If you say, “Ok Google, send a WhatsApp message to Joe,” you’ll get a prompt asking you to dictate your message. Alternatively, you can just say: “Ok Google, send a Viber message to Josh: let’s do dinner tomorrow night.”