BlackBerry has added support for android and not seen a change. They have their Enterprise services, so reap revenue through that, but otherwise the consumer handset division is stagnant. Shame as, when it works, the android runtime can be rather good - though one must jump through hoops... And, as the sales show, people don't want to do that.
Windows 10 may change things up. They said that about windows 8. Whether it does out not will depend on the time and money msft throws at the platform. They have both.
But it isn't just about a viable platform. Android devices outnumber apple by a massive margin, but devs flock to apple. Why? Figure that out and sales will soar. Sure, selling bottom of the table devices, mass market, is an approach to making up the sales numbers but that isn't attracting devs - and some are leaving or restricting access to services. Even with the numbers as they are. Go figure.