Lesson 0.5 Previewing app layout on various devices and screen sizes (without having them)

The previous lesson was finished after we managed to open activity_main.xml file with a layout of our first app. You should see preview of app interface on the screen: app name, Hello word text and system menu at the bottom. This is not working app in which you could click (we would run app in the next lesson), but preview of the app layout.

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