The project you created in Chapter 3 is composed of just the default files generated by the Android build tools—you did not write any Java code yourself. In this chapter, you will modify that project to make it somewhat more interactive. Along the way, you will examine the basic Java code that comprises an Android activity.
The instructions in this chapter assume you followed the original instructions in Chapter 3 in terms of the names of packages and files. If you used different names, you will need to adjust the names in the following steps to match yours.
src/ directory contains the standard Java-style tree of directories based on the Java package you used when you created ...