[android-developers] Negative resource id value?

Is it possible that a resource id (such as a generated id for a string
resource) can be a negative int?

Often, when defining a method that accepts a resource id, I want the
caller to be able to specify a "null" value. For primitives this is
not possible, but I'm wondering whether "any negative value" may be a
good approach?

Alternatively I suppose it would be OK to specify the argument as an
Integer and take advantage of auto-boxing.

Thoughts?

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