Android is open for apps. If you write an app once, it should run on all Android devices, in theory. In practise Android application developers are facing an increasing fragementation problem caused by different OS versions, hardware form factors, OEM specifics, device types (car computers, set top boxes, routers, ..), etc. Building apps that run on all (or at least most) Android devices is getting extremely difficult and expensive, thus the reach of apps is significantly reduced. The fragmentation problem is just starting and most certainly it is going to grow rapidly as more and more devices, firmware images, device types and OS version will enter the market. Fact is that fragmentation is there and that will be there always. What can we do about it? Embrace it!