Starting with Marshmallow, Android added a built-in theme engine called “Runtime Resource Overlay,” or RRO. This theme engine was intended to be used only by smartphone manufacturers, not end-users, so unlike Cyanogen’s CM Theme Engine, owners can’t use it to change the look and feel of their phones.

But this is Android we’re talking about here—of course there’s a way to activate this hidden theme engine. In the past, we’ve been able to activate RRO using an app called Layers, and now, that same app has been completely revamped to work on Nougat and make the whole process of unlocking these… more


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