Android icon尺寸

1.屏幕尺寸

ldpi (low) ~120dpi
mdpi (medium) ~160dpi
hdpi (high) ~240dpi
xhdpi (extra-high) ~320dpi
xxhdpi (extra-extra-high) ~480dpi
xxxhdpi (extra-extra-extra-high) ~640dpi

xlarge screens are at least 960dp x 720dp
large screens are at least 640dp x 480dp
normal screens are at least 470dp x 320dp
small screens are at least 426dp x 320dp

2.icon的类别

mdpi (Baseline): 160 dpi 1×
hdpi: 240 dpi 1.5×
xhdpi: 320 dpi 2×
xxhdpi: 480 dpi 3×
xxxhdpi: 640 dpi 4× (launcher icon only)

Launcher icons (.Png)
48 × 48 (mdpi)
72 × 72 (hdpi)
96 × 96 (xhdpi)
144 × 144 (xxhdpi)
192 × 192 (xxxhdpi)
512 × 512 (Google Play store)

Action bar, Dialog & Tab icons
24 × 24 area in 32 × 32 (mdpi)
36 × 36 area in 48 × 48 (hdpi)
48 × 48 area in 64 × 64 (xhdpi)
72 × 72 area in 96 × 96 (xxhdpi)
96 × 96 area in 128 × 128 (xxxhdpi)*

Notification icons
22 × 22 area in 24 × 24 (mdpi)
33 × 33 area in 36 × 36 (hdpi)
44 × 44 area in 48 × 48 (xhdpi)
66 × 66 area in 72 × 72 (xxhdpi)
88 × 88 area in 96 × 96 (xxxhdpi)*

Small Contextual Icons
16 × 16 (mdpi)
24 × 24 (hdpi)
32 × 32 (xhdpi)
48 × 48 (xxhdpi)
64 × 64 (xxxhdpi)*

3.常见手机尺寸

HVGA ---- mdpi ------- 480 × 320
WVGA ---- hdpi ------- 800 × 480
FWVGA --- hdpi ------- 854 × 480
QHD ------ hdpi ------- 960 × 540
720P ----- xhdpi ------ 1280 × 720 标清
1080P ---- xxhdpi ---- 1920 × 1080 高清

自动生成不同尺寸的工具

另外

res/layout/my_layout.xml // layout for normal screen size ("default")

res/layout-large/my_layout.xml // layout for large screen size
res/layout-xlarge/my_layout.xml // layout for extra-large screen size
res/layout-xlarge-land/my_layout.xml // layout for extra-large in landscape orientation

res/drawable-mdpi/graphic.png // bitmap for medium-density
res/drawable-hdpi/graphic.png // bitmap for high-density

res/drawable-xhdpi/graphic.png // bitmap for extra-high-density
res/drawable-xxhdpi/graphic.png // bitmap for extra-extra-high-density

res/mipmap-mdpi/my_icon.png // launcher icon for medium-density
res/mipmap-hdpi/my_icon.png // launcher icon for high-density
res/mipmap-xhdpi/my_icon.png // launcher icon for extra-high-density
res/mipmap-xxhdpi/my_icon.png // launcher icon for extra-extra-high-density
res/mipmap-xxxhdpi/my_icon.png // launcher icon for extra-extra-extra-high-density

参考链接

1.http://stackoverflow.com/questions/12768128/android-launcher-icon-size
2.https://developer.android.com/guide/practices/screens_support.html#xxxhdpi-note