I sincerely hope that Material You is improved upon in future versions, as while I love it and its concept, it needs a lot of work. Mishaal Rahman has confirmed that this denial of service attack will be fixed in Android 12L. If you change your wallpaper quickly, for instance, you can effectively institute a denial of service attack. Material You's dynamic colors are certainly not without their problems, and it's not all that hard to break it fundamentally. You can’t use them to override raw data resources, layouts, strings, or arrays - at least not easily. That includes integers, dimensions, booleans, and colors. Fabricated Overlays, on the other hand, can only override values that can be represented as integers. Android 11 made some changes to how RROs work, making overriding layouts not really feasible anymore. Before Android 11, RROs could override pretty much any resource: booleans, integers, dimensions, attributes, layouts, and even raw data files.
For one, RROs work through an overlay APK installed on a device, whereas a Fabricated Overlay simply tells an app what colors to use.įabricated Overlays are also a small bit more limited than RROs. Fabricated Overlays are a new addition to Android 12, and they work slightly differently from RROs. In the past, we've talked about how Fabricated Overlays can be used to bring back rootless theming. RROs haven't gone anywhere, and Material You works through the Fabricated Overlays API. What happened to Runtime Resource Overlays (RROs)? Afterward, those colors are mapped back to RGB for setting colors throughout the system. The CAM16 color appearance model is used for sorting and filtering the colors to determine the actual seed color, and then palettes are generated using that seed color. It extracts up to 128 colors from the wallpaper to the CIELAB color space as an intermediary, then those colors are mapped to CAM16. Dynamic theming or custom theming uses values in these tonal palettes to set the theme attributes for that color range. From these colors, the algorithm creates tonal palettes ranging from 0% luminance (BLACK) to 100% (WHITE). At the same time, it is applying color theory and accessibility rules. Two neutral colors are also chosen which give Material You its overall tint. When a user changes their wallpaper on an Android 12 device, the image is analyzed to select a color and algorithmically choose Primary, Secondary, Tertiary, and Error colors using an initial seed color.
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