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Thursday, August 23, 2012

Difference between the px, dp, dip and sp used in Android?


px
Pixels - corresponds to actual pixels on the screen.
in
Inches - based on the physical size of the screen.
mm
Millimeters - based on the physical size of the screen.
pt
Points - 1/72 of an inch based on the physical size of the screen.
dp
Density-independent Pixels - an abstract unit that is based on the physical density of the screen. These units are relative to a 160 dpi screen, so one dp is one pixel on a 160 dpi screen. The ratio of dp-to-pixel will change with the screen density, but not necessarily in direct proportion. Note: The compiler accepts both "dip" and "dp", though "dp" is more consistent with "sp".
·         If running on hdpi device 150x150 px image will take up 100*100 dp of screen space.
·         If running on mdpi device 150x150 px image will take up 150*150 dp of screen space.
·         If running on xhdpi device 150x150 px image will take up 75*75 dp of screen space.

sp
Scale-independent Pixels - this is like the dp unit, but it is also scaled by the user's font size preference. It is recommend you use this unit when specifying font sizes, so they will be adjusted for both the screen density and user's preference.

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