1、通过源码查看 Android 版本
路径：build/core/version_defaults.mk
PLATFORM_VERSION := 5.1.1
2、通过编译时终端输出查看
============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=5.1.1 TARGET_PRODUCT=rk3288 TARGET_BUILD_VARIANT=eng TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm TARGET_ARCH_VARIANT=armv7-a-neon TARGET_CPU_VARIANT=cortex-a15 TARGET_2ND_ARCH= TARGET_2ND_ARCH_VARIANT= TARGET_2ND_CPU_VARIANT= HOST_ARCH=x86_64 HOST_OS=linux HOST_OS_EXTRA=Linux-3.13.0-39-generic-x86_64-with-Ubuntu-14.04-trusty HOST_BUILD_TYPE=release BUILD_ID=LMY49F OUT_DIR=out ============================================
3、通过编译后的输出文件查看
路径：out/target/product/xxx/system/build.prop
ro.build.version.release=5.1.1