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

最新推荐文章于 2023-05-10 17:07:49 发布

转载最新推荐文章于 2023-05-10 17:07:49 发布 · 358 阅读

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本文详细解释了Android开发中使用的各种UI单位，包括px（像素）、dp/dip（密度独立像素）、sp（比例独立像素）。这些单位如何根据屏幕密度进行转换，并推荐在不同场景下使用合适的单位。

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

You would use

sp for font sizes
dip for everything else.

dip==dp

From Android Developers center:

px
Pixels - corresponds to actual pixels on the screen.

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

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".

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.

http://stackoverflow.com/questions/2025282/difference-between-px-dp-dip-and-sp-in-android