As another option, App Inventor has an Android emulator that puts a simulated Android screen on the computer desktop. This enables you to view the app’s progression if you do not have an Android device. It also is useful for anyone using App Inventor in a classroom environment.
An installer package is available for Windows or Mac. Choose the proper platform from the App Inventor site and download it to your computer (see Figure 2.10).
To view your app, choose Emulator from the same menu in Figure 2.8.