Pixel Densities
Android icons require five separate sizes for different screen pixel densities. Icons for lower resolution are created automatically from the baseline.
| mdpi (Baseline) | 160 dpi | 1× |
| hdpi: | 240 dpi | 1.5× |
| xhdpi: | 320 dpi | 2× |
| xxhdpi: | 490 dpi | 3× |
| xxxhdpi: | 640 dpi | 4× |
Launcher icons
| 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) |
These icons are used in the action bar menu. The first number is the size of the icon area, and the second is file size.
Small Contextual Icons
| 16 × 16 (mdpi) |
|---|
| 24 × 24 (hdpi) |
| 32 × 32 (xhdpi) |
| 48 × 48 (xxhdpi) |
| 64 × 64 (xxxhdpi) |
Small icons are used to surface actions and/or provide status for specific items. For example, in the Gmail app, each message has a star icon that marks the message as important.
Notification icons
These are used to represent application notifications in the status bar. They should be flat (no gradients), white and face-on perspective
| 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) |
Taken from here
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