Android应用启动器图标实际大小

Question

According to android info over the web app launcher sizes should be following:

48 × 48 (mdpi)
72 × 72 (hdpi)
96 × 96 (xhdpi)
144 × 144 (xxhdpi)
192 × 192 (xxxhdpi)

But when I make screenshot from my Nexus5 actual pixel size is different (180x180 for xxhdpi), looks like Lollipop use different icon size.

What I mean:

PS I am using default android launcher, no mods or accessibility settings.

Answer 1

Some devices scale-up the launcher icon by as much as 25%. For example, if your highest density launcher icon image is already extra-extra-high density, the scaling process will make it appear less crisp. So you should provide a higher density launcher icon in the mipmap-xxxhdpi directory, which the system uses instead of scaling up a smaller version of the icon.

Note: The mipmap-xxxhdpi qualifier is necessary only to provide a launcher icon that can appear larger than usual on an xxhdpi device. It is best practice to place all your launcher icons in the res/mipmap-[density]/ folders. This enables your app to display launcher icons that have a higher density than the device, without scaling up a lower density version of the icon. You do not need to provide xxxhdpi assets for all your app's images.