Android:focusable="false" vanishes

Using the first edition book of BigNerdRanchGuide, Listing 9.21 (page 189), when I add the following line:

and try to run the app (Shift+F10), the mentioned line suddenly disappears from my list_item_crime.xml (And I guess that this is the reason why I can no more click the list itens and show the Log.d tags).

Could someone help me try to figure out why?

Hm. Not sure what’s going on here.

Are you sure you’re editing the right file? When there are errors, Android Studio will sometimes open up a intermediate version of the file that it created during the build process. This file is completely overwritten every time you build.

Try opening up the file from scratch in the Project Tool window and making the change.