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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