CHAPTER 3: An Introduction to the Android Application Development Platform 99Finally, we learned how to create a custom Android application icon, which is always a top request
from any new Android app developer. You learned how to use GIMP 2.8.10 to create a launcher icon
with a transparent background, and how to save it in all the required screen density resolutions. In
the next chapter, you will learn all about the XML markup language by taking an in-depth look at the
Android application that you created during this chapter, including the XML files in the /res/values/
folder as well as the /res/layout/ folder and the AndroidManifest.xml file from your HelloUniverse
project root folder.