Drawable resources app launcher icon size

Question

I have some confusion regarding drawable resource icon size. As per the Android developer support guidelines here. I found below information

36x36 (0.75x) for low-density
48x48 (1.0x baseline) for medium-density
72x72 (1.5x) for high-density
96x96 (2.0x) for extra-high-density
180x180 (3.0x) for extra-extra-high-density
192x192 (4.0x) for extra-extra-extra-high-density (launcher icon only; see note above)

As per the my understanding 180x180 (3.0x) for extra-extra-high-density should be 144x144 (3.0x) because, if extra-high-density (96x96) is (2.0x) and extra-extra-high-density is (3.0x) So that extra-extra-high-density resolution should be 144x144.

One more solution found here for xxhdpi app launcher icon size should be (144X144)
Different resolution support android is

mipmap-mdpi (48X48)
mipmap-hdpi (72X72)
mipmap-xhdpi (96X96)
mipmap-xxhdpi (144X144)
mipmap-xxxhdpi (192X192)

I have doubt why they mentioned 180x180 (3.0x) for extra-extra-high-density. Kindly Suggest me.

Thanks for help

Answer 1

  LDPI should be 36 x 36.

MDPI should be 48 x 48.

HDPI should be 72 x 72.

XHDPI should be 96 x 96.

XXHDPI should be 144 x 144.

XXXHDPI should be 192 x 192.

Answer 2

To create alternative bitmap drawables for different densities, you should follow the 3:4:6:8:12:16 scaling ratiobetween the six generalized densities.

For example, if you have a bitmap drawable that's 48x48 pixels for medium-density screens, all the different sizes should be:

• 36x36 (0.75x) for low-density

• 48x48 (1.0x baseline) for medium-density

• 72x72 (1.5x) for high-density

• 96x96 (2.0x) for extra-high-density

• 180x180 (3.0x) for extra-extra-high-density

• 192x192 (4.0x) for extra-extra-extra-high-density