从源码中查看当前android版本

1: 系统没有编译,从代码中查看当前版本

 vim build/core/version_defaults.mk
# Default versions for each TARGET_PLATFORM_VERSION# TODO: PLATFORM_VERSION, PLATFORM_SDK_VERSION, etc. should be conditional# on this# 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.# When you add a new PLATFORM_VERSION which will result in a new# PLATFORM_SDK_VERSION please ensure you add a corresponding isAtLeast*# method in the following java file:# frameworks/support/compat/gingerbread/android/support/v4/os/BuildCompat.java# When you change PLATFORM_VERSION for a given PLATFORM_SDK_VERSION# please add that PLATFORM_VERSION as well as clean up obsolete PLATFORM_VERSION's# in the following text file:# cts/tests/tests/os/assets/platform_versions.txtPLATFORM_VERSION.OPM1 := 8.1.0

 当前代码系统版本为 8.1.0

2 :   执行 配置选项,可以通过PLATFORM_VERSION查看到当前PLATFORM_VERSION版本号;

source build/envsetup.shlunch msm8953_64-userdebug