Because Unity handles projects and assets in a generic way, there is no need to create multiple projects for multiple target platforms. This means that you could easily start development with the free version of Unity and target personal computers. Then, at a later date, you can switch targets to the Android platform with the click of a button. Perhaps, shortly after your game is launched, it takes the market by storm and there is a great call to bring it to other mobile platforms. With just another click of the button, you can easily target iOS without changing anything in your project.
Most systems require a long and complex set of steps to get your project running on a device. For the first application in this book, we will be going through that process because it is important to know about it. However, once your device is set up and recognized by the Android SDK, a single-button click will allow Unity to build your application, push it to a device, and start running it. There is nothing that has caused more headaches for some developers than trying to get an application on a device. Unity makes it simple.
With the addition of a free Android application, Unity Remote, it is simple and easy to test mobile inputs without going through the whole build process. While developing, there is nothing more annoying than waiting for 5 minutes for a build every time you need to test a minor tweak, especially in the controls and interface. After the first dozen little tweaks the build time starts to add up. Unity Remote makes it simple and easy to test it all without ever having to hit the Build button.
These are the big three: generic projects, a one-click build process, and Unity Remote. We could, of course, come up with several more great ways in which Unity and Android can work together. But these three are the major time and money savers. You could have the greatest game in the world but, if it takes 10 times as long to build and test, what is the point?