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For those of use who have spent any amount of time in the Android source code, it's not news that the IDs generated in the android.R class do not 1:1 reflect the actual resources found in the res/ directories of the supplied JAR. Many of the drawables/styles/layouts are not "public" and accessible to applications by referencing android.R.xxx . My question is does anyone know the mechanism by which Android is able to generate an R.java class that differs from the actual resource graph? Secondarily, is it a mechanism (using build rules, etc.) that we as developers could leverage to partially protect the ids that get made public in applications used as libraries? Thanks in advance! Source: Tips4all