March 2013
Beginner to intermediate
580 pages
16h 11m
English
Content preview from Android Programming: The Big Nerd Ranch GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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More Resource Rules and Regulations
Now that you are more familiar with the Android resource system, here are some system requirements you should know about when it comes time to build your own apps.
Resource naming
Resource names must be lowercase and must not have any spaces – one_small_step.wav, app_name, armstrong_on_moon.jpg.
Whether you reference a resource in XML or code, the reference does not include the file extension.
For example, you refer to @drawable/armstrong_on_moon in your layout files and R.drawable.armstrong_on_moon in your code.
This means that you cannot rely on extensions to distinguish identically named resource files in the same subdirectory.
Resource directory structure
Resources must be saved in a subdirectory of
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