4. Change ActionBarActivity in every activity class to Activity and remove the import statement that imports ActionBarActivity. The shortcut for this in Android Studio is Ctrl+Alt+O. 5. xml files, replace app:showAsAction with android:showAsAction. For example, replace app:showAsAction="never" with android:showAsAction="never" 6. Rebuild the project by selecting Project > Rebuild Project. Summary This chapter discusses how to install the required software and create your first application.