Android ROM修改编译出的apk对应sdk版本

/build/core/version_defaults.mk文件中这一段

ifeq "" "$(DEFAULT_APP_TARGET_SDK)" 
  # This is the default minSdkVersion and targetSdkVersion to use for 
  # all .apks created by the build system.  It can be overridden by explicitly 
  # setting these in the .apk's AndroidManifest.xml.  It is either the code 
  # name of the development build or, if this is a release build, the official 
  # SDK version of this release. 
  ifeq "REL" "$(PLATFORM_VERSION_CODENAME)" 
    DEFAULT_APP_TARGET_SDK := $(PLATFORM_SDK_VERSION) 
  else 
    DEFAULT_APP_TARGET_SDK := $(PLATFORM_VERSION_CODENAME) 
  endif 
endif 

将DEFAULT_APP_TARGET_SDK直接赋值相应的API等级即可。