A collection of UI specifications/requirements for Android Apps

Android App UI Requirements

Icons:
Refer http://developer.android.com/design/style/iconography.html

App Launcher Icon:
Sizes – 48x48dp (Full Asset), 512x512dp
Extended:
drawable-ldpi (120 dpi, Low density screen) - 36px x 36px
drawable-mdpi (160 dpi, Medium density screen) - 48px x 48px
drawable-hdpi (240 dpi, High density screen) - 72px x 72px
drawable-xhdpi (320 dpi, Extra-high density screen) - 96px x 96px
drawable-xxhdpi (480 dpi, Extra-Extra-high density screen) - 144px x 144px

ActionBar Icons
Sizes – [32x32dp (Full Asset), 24x24 (Optical Square)]
 
Notification App Icon
Sizes – [24x24dp (Full Asset), 22x22 (Optical Square)]

Backgrounds: http://developer.android.com/guide/practices/screens_support.html
Mobile:
• 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
Tablet:
•	600dp: a 7” tablet (600x1024 mdpi).
•	720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).

Buttons:
Primary Action Buttons
•	48x48 for medium-density
•	72x72 for high-density
•	96x96 for extra high-density
Keep the same resolution for Wide Buttons too, as they can be extended using Draw 9-patch

ActionBar Background hex code
(Single Color or 2 color transition or a PNG image)

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ActionBar Icons:

Full asset size = 32x32
Image size = 24x24

Full asset size = 48x48
Image size = 32x32

Full asset size = 64x64
Image size = 48x48