Actionable Messages enable you to take quick actions right from within Outlook. For example, an leave approval email from an employee to his manager will include approve/decline button, allowing manager to take action within Outlook. Microsoft today released an updated Outlook for Android app that supports Actionable Messages for emails from Microsoft Flow, SharePoint, MyAnalytics, and more. You’ll find buttons in the body of supported messages that let you take action in context. Actionable Messages are supported only for Office 365 and Outlook.com accounts.
You can download the updated app here from Play Store.