There should be a way to launch the powerbi app through a URI protocol / scheme and link back to the calling app. (See http://community.powerbi.com/t5/Mobile-Apps/Integration-Options-with-other-apps...
Hi, We added support for mobile deep linking. You can create and use a uniform resource identifier (URI) to link to a specific location (a deep link) within the Power BI mobile apps on all the mobile platforms: iOS, Android devices, and Windows 10. URI links can point directly to dashboards, tiles, and reports. Read more in our documentation: https://powerbi.microsoft.com/en-us/documentation/powerbi-mobile-deep-link-specific-location/
