本文详细介绍了Android的Build Types，包括user、userdebug和eng三种类型。user类型适用于最终发布，设置安全限制，关闭adb；userdebug增加了调试功能，适合有限调试；eng类型则针对平台级调试，安装所有调试相关模块，开启ro.kernel.android.checkjni，并默认关闭adb。
BuildType specifies the intended use (security restrictions)
* user
· Intended to be the final release
· Installs modules tagged as user
· Installs non-APK modules that have no tags specified
· Installs APKs according to the product definition files (tags are ignored for APK modules)
· Sets ro.secure=1
· Sets ro.debuggable=0
· adbd is disabled by default (i.e. has to be enabled via Settings ! Applications ! Development ! USB
Debugging)
* userdebug - the same as user, except:
· Intended for limited debugging
· Installs modules tagged with debug
· Sets ro.debuggable=1
· adbd is enabled by default
* eng
· Intended for platform-level debugging
· Installs modules tagged with: eng, debug, user, and/or development
· Installs non-APK modules that have no tags specified
· Installs APKs according to the product definition files, in addition to tagged APKs
· Sets ro.secure=1
· Sets ro.debuggable=0
· Sets ro.kernel.android.checkjni=1
· adbd is enabled by default
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