Option #1: Just ship the -xxhdpi
drawables and let Android downsample them for you at runtime (downside: will only work on fairly recent devices, where -xxhdpi
is known).
Option #2: Use Android Asset Studio to downsample them for you.
Option #3: Automate the process within a graphics editor, per ssantos’ answer.
Option #4: Script yourself a solution, using something like ImageMagick.
Option #5: Use image baker