xxxhdpi

xxxhdpi is a pixel density qualifier used by the Android operating system to describe screens with very high resolution. It corresponds to about 640 dots per inch (dpi), four times the baseline mdpi density of 160 dpi. It is part of Android’s density bucket system, which also includes ldpi, mdpi, hdpi, xhdpi, and xxhdpi.

In Android development, bitmap resources can be organized into density-specific directories such as drawable-ldpi, drawable-mdpi, drawable-hdpi, drawable-xhdpi, drawable-xxhdpi, and drawable-xxxhdpi (and the mipmap variants for launcher icons). The system selects the most appropriate resource for the device’s screen density and scales assets if a matching density file is unavailable. For xxxhdpi devices, assets placed in the xxxhdpi bucket are used directly when available; otherwise, the system will scale from another density bucket.

xxxhdpi resources are typically used for ultra-high-density devices, including some modern smartphones where icons and images need very fine detail. The qualifier is most relevant for raster images and launcher icons; vector drawables can scale across densities without separate bitmap variants.

Best practices include providing density-specific assets for several buckets, including xxxhdpi, to avoid scaling artifacts on high-density screens. Where possible, using vector drawables for scalable UI elements reduces the need for multiple bitmap variants. When using bitmaps, remember that an asset for xxxhdpi is four times the size of its mdpi counterpart, aligning with the 4x density factor relative to mdpi.