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

+3 votes
asked Nov 23, 2015 in Android by user234 (980 points)

Please explain me  the difference between the px, dip, dp and sp units in Android?

1 Answer

+1 vote
answered Nov 25, 2015 by jo (580 points)
Best answer

px is one pixel.
sp is scale-independent pixels.
dip is Density-independent pixels.

Pixels - corresponds to actual pixels on the screen.

Inches - based on the physical size of the screen.
1 Inch = 2.54 centimeters

Millimeters - based on the physical size of the screen.

Points - 1/72 of an inch based on the physical size of the screen.

Refer this for more info

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".

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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