怎么查看android 版本

怎么查看android 版本
可以查看文件：　/build/core/version_defaults.mk

可以看到里面有大概如下内容：

ifeq "" "$(PLATFORM_VERSION)"
  # This is the canonical definition of the platform version,
  # which is the version that we reveal to the end user.
  # Update this value when the platform version changes (rather
  # than overriding it somewhere else).  Can be an arbitrary string.
  PLATFORM_VERSION := 2.3.6
endif

 PLATFORM_VERSION := 2.3.6