Once launched, the tool will appear as outlined in Figure 4-2 if existing AVD instances have been created: This can be achieved from within the Android Studio environment by selecting the Tools -> Android -> AVD Manager menu option from within the main window. To create a new AVD, the first step is to launch the AVD Manager. In order to test the behavior of an application in the absence of a physical device, it will be necessary to create an AVD for a specific Android device configuration.
New AVDs are created and managed using the Android Virtual Device Manager, which may be used either in command-line mode or with a more user-friendly graphical user interface. Figure 4-1, for example, shows an AVD session configured to emulate the Google Nexus 5X model.
When launched, an AVD will appear as a window containing an emulated Android device environment. Check the online developer documentation for your device to find out if emulator definitions are available for download and installation into the AVD environment. Additional templates may be loaded or custom configurations created to match any physical Android device by specifying properties such as processor type, memory capacity and the size and pixel density of the screen. As part of the standard Android Studio installation, a number of emulator templates are installed allowing AVDs to be configured for a range of different devices. An AVD may be configured to emulate a variety of hardware features including options such as screen size, memory capacity and the presence or otherwise of features such as a camera, GPS navigation support or an accelerometer. AVDs are essentially emulators that allow Android applications to be tested without the necessity to install the application on a physical Android based device.
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