Android screen adaptation guide (1) core concept and unit detailed

What do you mean, fragmentation?

Popular speaking also means that the whole Android platform is becoming more and more differentiated,

Any successful intelligent operating system is supported by a large amount of software resources, which requires a certain degree of consistency between the system and hardware,

This ensures software compatibility, and third-party software developed by individuals and groups also has certain specifications to ensure that software and equipment

Fully compatible. And because Android is completely free and full of open source nature, it eventually leads to software compatibility for Android devices

To make software development more difficult (the main difficulty is to let the software run on more devices), resulting in a knot

Result: Software developers and software developers will abandon development because of the difficulty of development and the increased cost of development. Eventually Android will

died because of "bleeding too much".

Screen resolution: Pixel dots in portrait px = 1 pixels

Transverse pixels * Portrait pixels

Screen pixel density: pixel points per inch

Unit: DPI per dot inch

Related to screen size and screen resolution

How to calculate:

Screen size is the length of the diagonal line

Screen resolution is a cross-portrait pixel point

To Nexus 5:

Screen 4.95inch

Resolution 1920*1080

DPI = 455

1920*1920+1080*1080 2202.9 of the square that writes the diagonal pixel point

Divided by Screen 4.95 = 455;

　

　　　　

Android screen adaptation guide (1) core concept and unit detailed