* Screen Size: Length of screen diagonal
* Resolution: The number of pixel points in 2 directions, common value 480X800, 320X480
* dpi:dots per inch, pixel density, which is the number of pixels per inch.
* Calculation method: Screen resolution/Screen physical size
* If you have a phone, the physical size of the screen is 1.5 inches x2 inches, the screen resolution is 240x320, the pixel density is 240/1.5=160dpi (landscape) or 320/2=160dpi (portrait), 160DPI is the pixel density of this phone. This value is the same for both landscape and portrait, because most phone screens use square pixels (except of course, a wonderful screen).
* Android Common pixel density: ldpi (MDPI), hdpi (x), xhdpi (320), their corresponding DP to PX coefficients are 0.75, 1, 1.5 and 2, this factor multiplied by the DP length is the number of pixels.
* For example, the interface has a length of "80dp" picture, then it is actually displayed as 80x1.5=120px on the 240dpi phone, on the 320dpi phone actually displayed as 80x2=160px
* px: pixels. 1px represents a physical pixel point on the screen
* dip/dp:density independent pixels, the device independent pixel point, and pixel density.
* on MDPI's cell phone, 1dp=1px
* on HDPI's cell phone, 1dp=1.5px
* on XHDPI's cell phone, 1dp=2px
* Sp:scale-independent Pixel, an abstract pixel independent of scale. Similar to DP, specifically used to identify text
* * Conclusion: On Android, the description text size is used SP, the other is used dp**
From for notes (Wiz)
Screen Size related concepts
