Ideally, these two layers should be vector assets, but they can also be PNGs. So… Adaptive IconsĪn Adaptive Icon is made up of two layers, foreground, and background, both of 108x108 dp.

This was solved in Android 8.0 with the introduction of Adaptive Icons. This new feature had some restrictions, especially with OEMs looking to differentiate their devices by having different icon shapes (ie: Pixel devices use circular icons, Samsung a rounded square shape, and other OEMs might use a rectangular shape). The second attempt at trying to introduce a more consistent icon experience was in Android 7.1 (Nougat) with the introduction of the roundIcon. Samsung was the first OEM that introduced a background behind the icons that make them look more consistent. This started a new movement in trying to normalize the icon shapes and sizes in the Android Platform. But this resulted in a Launcher full of icons with different shapes and sizes and a lot of inconsistency. Initially having a unique shape was a good practice because it meant your app icon was more likely going to stand out compared to other apps. It means your icon can be a circle, square, or any shape really. This opens the opportunity to have icons with different types of shapes. The icon's size needs to be 48x48 dp and it can have any transparency. You need to have at least one PNG for each different density from mdpi to xxhdpi (four in total), but ideally, you should also add one for the xxxhdpi. Let's talk about how icons were implemented in versions prior to Oreo, which we will call legacy icons from now on. Not so many things have changed since then, but I think it will be good if we do a quick review on the topic. They were introduced in Android 8.0 (Oreo), around four years ago. Adaptive icons are definitely not a new thing in the Android world.

Rounded square icon android studio