Android phone screen resolution and the difference between sp, dip (dp), and px
Resolution refers to the number of pixels contained in a unit length, and its unit is usually pixels per inch (ppi). For a screen with a resolution of 1024×768 , that is, each horizontal line contains 1024 pixels , and there are 768 lines in total, that is, the number of scanning columns is 1024 columns and the number of rows is 768 lines. The resolution is not only related to the display size, but also affected by factors such as the dot pitch of the picture tube and the video bandwidth.
Mainstream resolution:
| code | Resolution | code | Resolution |
| QVGA | 320*240 pixels | WQVGA | 400*240 pixels |
| HVGA | 320*480 pixels | VGA | 640*480 pixels |
| WVGA | 800*480 pixels | XGA | 1024*480 pixels |
QVGA stands for Quarter VGA. As the name implies, it is the quarter size of VGA.
HVGA (Half-size VGA) is half of VGA (640*480).
WVGA is Wide VGA
WQVGA Full name: Wide Quarter Video Graphics Array
sp dip px
sp : (scaled pixels—best for text size)—scaled pixels . It is mainly used for font display. Therefore, according to google's suggestion, the font size of TextView is best to use sp as the unit, and viewing the source code of TextView shows that Android uses horizontal as the font size unit by default.
dip:(device independent pixels)——Device independent pixel : This is related to the device hardware. Generally, we recommend using this to pixels . Equivalent to dp.
Generally, HVGA (320*480) is used as the standard. For example, if a Button control has a width of 160dip, the width of the Button in WVGA, HVGA, QVGA, and WQVGA is half of the screen.
px:px(pixels)——Pixels : Different devices have the same display effect. Generally, our HVGA represents 320x480 pixels , which is used more. 1dip = 1px in HVGA (use with caution!)
Summary: use sp for fonts, and dip(dp) for other controls
Mobile phone screen width: It is usually expressed in inches, such as 2.4 inches, which means that the diagonal length of the screen is 2.4 inches (1 inch = 2.54 cm)