android系统源码中引用第三方jar包

如要在PMS中引用第三方的JAR包也是可以做到的（不建议这样）

在/android4.4/frameworks/base/services/java的Android.mk文件中做如下修改：

LOCAL_PATH:= $(call my-dir)

# the library
# ============================================================
include $(CLEAR_VARS)

LOCAL_SRC_FILES := \
            $(call all-subdir-java-files) \
     com/android/server/EventLogTags.logtags \
     com/android/server/am/EventLogTags.logtags

LOCAL_MODULE:= services

LOCAL_JAVA_LIBRARIES := android.policy conscrypt telephony-common

#modify by kingofwlh
LOCAL_STATIC_JAVA_LIBRARIES := gson-2.2.4

LOCAL_REQUIRED_MODULES := gson-2.2.4
#modify end

include $(BUILD_JAVA_LIBRARY)

include $(BUILD_DROIDDOC)

#modify by kingofwlh
include $(call all-makefiles-under,$(LOCAL_PATH))

#modify end

增加一个libs目录，把第三方jar包（gson-2.2.4.jar）放到里面，再新建一个Android.mk，内容如下：

LOCAL_PATH := $(call my-dir)

# ============================================================
include $(CLEAR_VARS)
LOCAL_MODULE := gson-2.2.4
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_CLASS := JAVA_LIBRARIES
LOCAL_SRC_FILES := $(LOCAL_MODULE).jar
include $(BUILD_PREBUILT)

这样再编译此模块就可以了。