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Next, you will choose how the layout resources will be qualified. Select layout in the Resource type drop-down box.

You should see a window similar to Figure 3.9 that lists the resource types and qualifiers for those types. In the Project tool window, right-click the res directory and select New → Android resource directory. To see this in action, let’s create an alternative resource for Android to find and use when the device’s screen orientation changes to landscape. When a runtime configuration change occurs, there may be resources that are a better match for the new configuration. On the other hand, some components, like screen orientation, can change at runtime. Screen density is a fixed component of the device configuration it cannot change at runtime.

You saw an example of this when you added multiple arrow icons to your project for different screen densities. Typically, applications provide alternative resources to match different device configurations. The characteristics that make up the configuration include screen orientation, screen density, screen size, keyboard type, dock mode, language, and more. The device configuration is a set of characteristics that describe the current state of an individual device. Rotating the device changes the device configuration. Device configurations and alternative resources First, let’s take a closer look at why this happens. Each time a new QuizActivity is created, mCurrentIndex is initialized to 0, and the user starts over at the first question. Rotate the device again to witness another round of destruction and rebirth. When you rotated the device, the instance of QuizActivity that you were looking at was destroyed, and a new one was created.