Unity supports many target platforms. Switching to a new target is easy as long as our plugins support it. We just need to set a few build configuration values, some of which are shared across multiple targets and some of which are platform-specific.

From the menu bar, select Preferences under Unity, which should bring up the Unity Preferences window. Click on the External Tools tab and set Android SDK Location to be the base path to your Android SDK installation. (We referred to this location as <android_sdk> in the Tegra Android Developer Pack section of Chapter 1, Preparing for the Mission.) Recent versions of Unity support API level 9 (Android 2.3) and newer versions, so you probably already have an appropriate API version installed with your Android SDK. Now, the window should look similar to the following screenshot:

Now, from the menu bar, select Build Settings under File. The Build Settings window should appear. Drag all of the sample...