Google launched custom voice actions on Android, allowing users to control select third-party apps by starting with the “Ok Google” command. Today, that functionality has expanded to messaging apps, including WhatsApp, WeChat, NextPlus, Telegram, and Viber.
If you already use “Ok Google” and your voice to send quick 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, just say: “Ok Google, send a Viber message to Josh: let’s do dinner tomorrow night.”
To be able to take advantage of this new feature, you do need to update both the Google app for Android, as well as your individual messaging apps. If either is outdated, you’ll just get an error or a bunch of search results.