[Android Learning note] Android Down and

Android Backwards-compatible ideas:
Use the high-version API to determine the API version of the real-world runtime platform at runtime, and to do different processing according to different versions

Key classes:
Build.class
It defines the API version related information

Inner class: VERSION
Defines the version information for the current system, which contains the SDK version information
Build.VERSION.SDK_INT can get the SDK version number of the currently running system

Inner class: Version_codes
Enumeration information for each version is defined

When fitting:

if (Build.VERSION.SDK_INT >= build.version_codes. Honeycomb) {    //  use a higher version of the API}orelse{    //  Use the lower version of the API here}