Android Icon Sizes
Android devices use the following screen pixel densities:
Low - ldpi - 120 dpi
Medium - mdpi - 160 dpi
High - hdpi - 240 dpi
Extra high - xhdpi - 320 dpi
Extra Extra high - xxhdpi - 480 dpi
Because each icon is required in multiple sizes to support different densities, the official design guidelines refer to the icon dimensions in dp (density-independent pixels) units, which are based on the pixel dimensions of a medium-density (MDPI) screen.
To create an icon for different densities, you should follow the 1.5:2:3:4:6 scaling ratio between these screen densities (low, medium, high, x-high, and xx-high).
For example, consider that the size for a launcher icon is specified to be 48x48 dp. This means the baseline (MDPI) asset is 48x48 px, and the high density (HDPI) asset should be 1.5x the baseline at 72x72 px, and the x-high density (XHDPI) asset should be 2x the baseline at 96x96 px, and the xx-high density (XXHDPI) asset should be 3x the baseline at 144x144 px, and the low density (LDPI) asset should be at 36x36 px.
Note: Normally you don't need to create custom assets for low density screens because Android effectively down-scales your HDPI assets by 1/2 to match the expected size.
Use a distinct silhouette. Three-dimensional, front view, with a slight perspective as if viewed from above, so that users perceive some depth.
Launcher icons for Android Market must be 512x512 pixels.
Generally you should use an optical square inside full PNG images to draw objects and do not use a space between the optical square and icon borders.
The following table shows sizes of interface icons in pixels
|Density||Launcher||Menu||Action Bar||Status Bar and Notification||Tab||Pop-up Dialog and List View||Small and Contextual|
|ldpi||36x36 px||36x36 / 24x24 px||24x24 / 18x18 px||18x18 / 16x16 px||24x24 / 22x22 px||24x24 px||12x12 / 9x9 px|
|mdpi||48x48 px||48x48 / 32x32 px||32x32 / 24x24 px||24x24 / 22x22 px||32x32 / 28x28 px||32x32 px||16x16 / 12x12 px|
|hdpi||72x72 px||72x72 / 48x48 px||48x48 / 36x36 px||36x36 / 33x33 px||48x48 / 42x42 px||48x48 px||24x24 / 18x18 px|
|xhdpi||96x96 px||96x96 / 64x64 px||64x64 / 48x48 px||48x48 / 44x44 px||64x64 / 56x56 px||64x64 px||32x32 / 24x24 px|
|xxhdpi||144x144 px||144x144 / 96x96 px||96x96 / 72x72 px)||72x72 / 66x66 px||96x96 / 84x84 px||96x96 px||48x48 / 36x36 px|
Note: the first icon dimension in table cell is full asset size, the second icon dimension is optical square. Dimension values are in pixels.
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