Android's theming system does not have the ability to dynamically re-set <color> IDs. And, assuming they managed to do so and keep the reference unaccessible to

Android's theming system does not have the ability to dynamically re-set <color> IDs. And, assuming they managed to do so and keep the reference unaccessible to users (because then you could just do context.getColor(android.R.color.material_you_color_primary) to resolve it), you can still access it through reflection.