Dpi, ppi, dip, dp, px, sp, dpippi

Source: Internet
Author: User

Dpi, ppi, dip, dp, px, sp, dpippi

Basic Concepts

1. dpi (dots per inch): The number of dots per inch; ppi (Pixel per inch): The number of dots per inch. Designed for the monitor, dpi = ppi.

2. dip (device independent pixels) devices are independent pixels. Different devices have different display effects, which are related to device hardware and do not depend on pixels.

3. dp (Density-independent pixel), an abstract unit based on screen Density. 1dp = 1px on a display at 160 o'clock per inch.

4. px (pixels) pixels are the actual pixel units on the screen.

5. sp (Scale-independent pixels), which is the font unit of Android, based on the 160PPI screen. When the font size is 100%, 1sp = 1px.


Second calculation method and conversion

Dpi = √ (Length: + width:)/screen diagonal inches

Conversion Formula of dp and px:

Dp * ppi/160 = px. For example, 1dp x 320ppi/160 = 2px.

Sp and px conversion formula:

Sp * ppi/160 = px

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