diff --git a/core/apicheck_msg_current.txt b/core/apicheck_msg_current.txt
deleted file mode 100644
index 440e7f8..0000000
--- a/core/apicheck_msg_current.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-
-******************************
-You have tried to change the API from what has been previously approved.
-
-To make these errors go away, you have two choices:
-   1) You can add "@hide" javadoc comments to the methods, etc. listed in the
-      errors above.
-
-   2) You can update current.txt by executing the following command:
-         make update-api
-
-      To submit the revised current.txt to the main Android repository,
-      you will need approval.
-******************************
-
-
-
diff --git a/core/apicheck_msg_last.txt b/core/apicheck_msg_last.txt
deleted file mode 100644
index 2993157..0000000
--- a/core/apicheck_msg_last.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-
-******************************
-You have tried to change the API from what has been previously released in
-an SDK.  Please fix the errors listed above.
-******************************
-
-
diff --git a/core/apidiff.mk b/core/apidiff.mk
deleted file mode 100644
index 8887ea4..0000000
--- a/core/apidiff.mk
+++ /dev/null
@@ -1,180 +0,0 @@
-#
-# Copyright (C) 2017 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-##
-##
-## Common to both jdiff and javadoc
-##
-##
-
-LOCAL_IS_HOST_MODULE := $(call true-or-empty,$(LOCAL_IS_HOST_MODULE))
-ifeq ($(LOCAL_IS_HOST_MODULE),true)
-my_prefix := HOST_
-LOCAL_HOST_PREFIX :=
-else
-my_prefix := TARGET_
-endif
-
-LOCAL_MODULE_CLASS := $(strip $(LOCAL_MODULE_CLASS))
-ifndef LOCAL_MODULE_CLASS
-$(error $(LOCAL_PATH): LOCAL_MODULE_CLASS not defined)
-endif
-
-full_src_files := $(patsubst %,$(LOCAL_PATH)/%,$(LOCAL_SRC_FILES))
-out_dir := $(OUT_DOCS)/$(LOCAL_MODULE)/api_diff/current
-full_target := $(call doc-timestamp-for,$(LOCAL_MODULE)-diff)
-
-ifeq ($(LOCAL_IS_HOST_MODULE),true)
-$(full_target): PRIVATE_BOOTCLASSPATH :=
-full_java_libs := $(addprefix $(HOST_OUT_JAVA_LIBRARIES)/,\
-  $(addsuffix $(COMMON_JAVA_PACKAGE_SUFFIX),$(LOCAL_JAVA_LIBRARIES)))
-full_java_lib_deps := $(full_java_libs)
-
-else
-
-ifneq ($(LOCAL_SDK_VERSION),)
-  ifeq ($(LOCAL_SDK_VERSION)$(TARGET_BUILD_APPS),current)
-    # Use android_stubs_current if LOCAL_SDK_VERSION is current and no TARGET_BUILD_APPS.
-    LOCAL_JAVA_LIBRARIES := android_stubs_current $(LOCAL_JAVA_LIBRARIES)
-    $(full_target): PRIVATE_BOOTCLASSPATH := $(call java-lib-files, android_stubs_current)
-  else ifeq ($(LOCAL_SDK_VERSION)$(TARGET_BUILD_APPS),system_current)
-    LOCAL_JAVA_LIBRARIES := android_system_stubs_current $(LOCAL_JAVA_LIBRARIES)
-    $(full_target): PRIVATE_BOOTCLASSPATH := $(call java-lib-files, android_system_stubs_current)
-  else ifeq ($(LOCAL_SDK_VERSION)$(TARGET_BUILD_APPS),test_current)
-    LOCAL_JAVA_LIBRARIES := android_test_stubs_current $(LOCAL_JAVA_LIBRARIES)
-    $(full_target): PRIVATE_BOOTCLASSPATH := $(call java-lib-files, android_test_stubs_current)
-  else
-    # TARGET_BUILD_APPS is set. Use the modules defined in prebuilts/sdk/Android.mk.
-    _module_name := $(call resolve-prebuilt-sdk-module,$(LOCAL_SDK_VERSION))
-    LOCAL_JAVA_LIBRARIES := $(_module_name) $(LOCAL_JAVA_LIBRARIES)
-    $(full_target): PRIVATE_BOOTCLASSPATH := $(call java-lib-files, $(_module_name))
-    _module_name :=
-  endif
-else
-  LOCAL_JAVA_LIBRARIES := core-oj core-libart core-simple ext framework $(LOCAL_JAVA_LIBRARIES)
-  $(full_target): PRIVATE_BOOTCLASSPATH := $(call java-lib-files, core-oj):$(call java-lib-files, core-libart):$(call java-lib-files, core-simple)
-endif  # LOCAL_SDK_VERSION
-LOCAL_JAVA_LIBRARIES := $(sort $(LOCAL_JAVA_LIBRARIES))
-
-full_java_libs := $(call java-lib-files,$(LOCAL_JAVA_LIBRARIES)) $(LOCAL_CLASSPATH)
-full_java_lib_deps := $(call java-lib-deps,$(LOCAL_JAVA_LIBRARIES)) $(LOCAL_CLASSPATH)
-endif # !LOCAL_IS_HOST_MODULE
-
-$(full_target): PRIVATE_CLASSPATH := $(subst $(space),:,$(full_java_libs))
-$(full_target): PRIVATE_DOCLAVA_CLASSPATH := $(HOST_OUT_JAVA_LIBRARIES)/jsilver$(COMMON_JAVA_PACKAGE_SUFFIX):$(HOST_OUT_JAVA_LIBRARIES)/doclava$(COMMON_JAVA_PACKAGE_SUFFIX)
-
-intermediates.COMMON := $(call local-intermediates-dir,COMMON)
-
-$(full_target): PRIVATE_SOURCE_PATH := $(call normalize-path-list,$(LOCAL_DROIDDOC_SOURCE_PATH))
-$(full_target): PRIVATE_JAVA_FILES := $(filter %.java,$(full_src_files))
-$(full_target): PRIVATE_JAVA_FILES += $(addprefix $($(my_prefix)OUT_COMMON_INTERMEDIATES)/, $(filter %.java,$(LOCAL_INTERMEDIATE_SOURCES)))
-$(full_target): PRIVATE_SOURCE_INTERMEDIATES_DIR := $(intermediates.COMMON)/src
-$(full_target): PRIVATE_SRC_LIST_FILE := $(intermediates.COMMON)/droiddoc-src-list
-
-ifneq ($(strip $(LOCAL_ADDITIONAL_JAVA_DIR)),)
-$(full_target): PRIVATE_ADDITIONAL_JAVA_DIR := $(LOCAL_ADDITIONAL_JAVA_DIR)
-endif
-
-# Lists the input files for the doc build into a text file
-# suitable for the @ syntax of javadoc.
-# $(1): the file to create
-# $(2): files to include
-# $(3): list of directories to search for java files in
-define prepare-doc-source-list
-$(hide) mkdir -p $(dir $(1))
-$(call dump-words-to-file, $(2), $(1))
-$(hide) for d in $(3) ; do find $$d -name '*.java' -and -not -name '.*' >> $(1) 2> /dev/null ; done ; true
-endef
-
-##
-##
-## jdiff only
-##
-##
-
-jdiff := \
-	$(HOST_JDK_TOOLS_JAR) \
-	$(HOST_OUT_JAVA_LIBRARIES)/jdiff$(COMMON_JAVA_PACKAGE_SUFFIX)
-
-doclava := \
-	$(HOST_JDK_TOOLS_JAR) \
-	$(HOST_OUT_JAVA_LIBRARIES)/doclava$(COMMON_JAVA_PACKAGE_SUFFIX)
-
-$(full_target): PRIVATE_NEWAPI := $(LOCAL_APIDIFF_NEWAPI)
-$(full_target): PRIVATE_OLDAPI := $(LOCAL_APIDIFF_OLDAPI)
-$(full_target): PRIVATE_OUT_DIR := $(out_dir)
-$(full_target): PRIVATE_OUT_NEWAPI := $(out_dir)/current.xml
-$(full_target): PRIVATE_OUT_OLDAPI := $(out_dir)/$(notdir $(basename $(LOCAL_APIDIFF_OLDAPI))).xml
-$(full_target): PRIVATE_DOCLETPATH := $(HOST_OUT_JAVA_LIBRARIES)/jdiff$(COMMON_JAVA_PACKAGE_SUFFIX)
-$(full_target): \
-		$(full_src_files) \
-		$(full_java_lib_deps) \
-		$(jdiff) \
-		$(doclava) \
-		$(OUT_DOCS)/$(LOCAL_MODULE)-docs-stubs.srcjar \
-		$(LOCAL_ADDITIONAL_DEPENDENCIES)
-	@echo Generating API diff: $(PRIVATE_OUT_DIR)
-	@echo   Old API: $(PRIVATE_OLDAPI)
-	@echo   New API: $(PRIVATE_NEWAPI)
-	@echo   Old XML: $(PRIVATE_OUT_OLDAPI)
-	@echo   New XML: $(PRIVATE_OUT_NEWAPI)
-	$(hide) mkdir -p $(dir $@)
-	@echo Converting API files to XML...
-	$(hide) mkdir -p $(PRIVATE_OUT_DIR)
-	$(hide) ( \
-		$(JAVA) \
-				$(addprefix -classpath ,$(PRIVATE_CLASSPATH):$(PRIVATE_DOCLAVA_CLASSPATH):$(PRIVATE_BOOTCLASSPATH):$(HOST_JDK_TOOLS_JAR)) \
-				com.google.doclava.apicheck.ApiCheck \
-				-convert2xml \
-					$(basename $(PRIVATE_NEWAPI)).txt \
-					$(basename $(PRIVATE_OUT_NEWAPI)).xml \
-	) || (rm -rf $(PRIVATE_OUT_DIR) $(PRIVATE_SRC_LIST_FILE); exit 45)
-	$(hide) ( \
-		$(JAVA) \
-				$(addprefix -classpath ,$(PRIVATE_CLASSPATH):$(PRIVATE_DOCLAVA_CLASSPATH):$(PRIVATE_BOOTCLASSPATH):$(HOST_JDK_TOOLS_JAR)) \
-				com.google.doclava.apicheck.ApiCheck \
-				-convert2xml \
-					$(basename $(PRIVATE_OLDAPI)).txt \
-					$(basename $(PRIVATE_OUT_OLDAPI)).xml \
-	) || (rm -rf $(PRIVATE_OUT_DIR) $(PRIVATE_SRC_LIST_FILE); exit 45)
-	@echo Running JDiff...
-	$(call prepare-doc-source-list,$(PRIVATE_SRC_LIST_FILE),$(PRIVATE_JAVA_FILES), \
-			$(PRIVATE_SOURCE_INTERMEDIATES_DIR) $(PRIVATE_ADDITIONAL_JAVA_DIR))
-	$(hide) ( \
-		$(JAVADOC) \
-				-encoding UTF-8 \
-				\@$(PRIVATE_SRC_LIST_FILE) \
-				-J-Xmx1600m \
-				-XDignore.symbol.file \
-				-quiet \
-				-doclet jdiff.JDiff \
-				-docletpath $(PRIVATE_DOCLETPATH) \
-				$(addprefix -bootclasspath ,$(PRIVATE_BOOTCLASSPATH)) \
-				$(addprefix -classpath ,$(PRIVATE_CLASSPATH)) \
-				-sourcepath $(PRIVATE_SOURCE_PATH)$(addprefix :,$(PRIVATE_CLASSPATH)) \
-				-d $(PRIVATE_OUT_DIR) \
-				-newapi $(notdir $(basename $(PRIVATE_OUT_NEWAPI))) \
-				-newapidir $(dir $(PRIVATE_OUT_NEWAPI)) \
-				-oldapi $(notdir $(basename $(PRIVATE_OUT_OLDAPI))) \
-				-oldapidir $(dir $(PRIVATE_OUT_OLDAPI)) \
-				-javadocnew ../../../reference/ \
-		&& touch -f $@ \
-	) || (rm -rf $(PRIVATE_OUT_DIR) $(PRIVATE_SRC_LIST_FILE); exit 45)
-
-ALL_DOCS += $(full_target)
-
-.PHONY: $(LOCAL_MODULE)-diff
-$(LOCAL_MODULE)-diff : $(full_target)
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index f738ab4..97a74ec 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -72,6 +72,7 @@
 LOCAL_DROIDDOC_CUSTOM_ASSET_DIR:=
 LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR:=
 LOCAL_DROIDDOC_DOC_ZIP :=
+LOCAL_DROIDDOC_JDIFF_DOC_ZIP :=
 LOCAL_DROIDDOC_HTML_DIR:=
 LOCAL_DROIDDOC_OPTIONS:=
 LOCAL_DROIDDOC_SOURCE_PATH:=
diff --git a/core/config.mk b/core/config.mk
index 676f325..676bd64 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -85,6 +85,7 @@
 $(KATI_obsolete_var PRODUCT_COMPATIBILITY_MATRIX_LEVEL_OVERRIDE,Set FCM Version in device manifest instead. See $(CHANGES_URL)#PRODUCT_COMPATIBILITY_MATRIX_LEVEL_OVERRIDE)
 $(KATI_obsolete_var USE_CLANG_PLATFORM_BUILD,Clang is the only supported Android compiler. See $(CHANGES_URL)#USE_CLANG_PLATFORM_BUILD)
 $(KATI_obsolete_var BUILD_DROIDDOC,Droiddoc is only supported in Soong. See details on build/soong/java/droiddoc.go)
+$(KATI_obsolete_var BUILD_APIDIFF,Apidiff is only supported in Soong. See details on build/soong/java/droiddoc.go)
 $(KATI_obsolete_var \
   DEFAULT_GCC_CPP_STD_VERSION \
   HOST_GLOBAL_CFLAGS 2ND_HOST_GLOBAL_CFLAGS \
@@ -174,7 +175,6 @@
 BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk
 BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk
 BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk
-BUILD_APIDIFF:= $(BUILD_SYSTEM)/apidiff.mk
 BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk
 BUILD_NATIVE_TEST := $(BUILD_SYSTEM)/native_test.mk
 BUILD_NATIVE_BENCHMARK := $(BUILD_SYSTEM)/native_benchmark.mk
diff --git a/core/soong_droiddoc_prebuilt.mk b/core/soong_droiddoc_prebuilt.mk
index 510609b..e2ec88c 100644
--- a/core/soong_droiddoc_prebuilt.mk
+++ b/core/soong_droiddoc_prebuilt.mk
@@ -23,3 +23,13 @@
 ifdef LOCAL_DROIDDOC_ANNOTATIONS_ZIP
 $(eval $(call copy-one-file,$(LOCAL_DROIDDOC_ANNOTATIONS_ZIP),$(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/$(LOCAL_MODULE)_annotations.zip))
 endif
+
+ifdef LOCAL_DROIDDOC_JDIFF_DOC_ZIP
+$(eval $(call copy-one-file,$(LOCAL_DROIDDOC_JDIFF_DOC_ZIP),$(OUT_DOCS)/$(LOCAL_MODULE)-jdiff-docs.zip))
+$(call dist-for-goals,docs,$(OUT_DOCS)/$(LOCAL_MODULE)-jdiff-docs.zip)
+
+ALL_DOCS += $(OUT_DOCS)/$(LOCAL_MODULE)-jdiff-docs.zip
+
+.PHONY: $(LOCAL_MODULE)-jdiff
+$(LOCAL_MODULE)-jdiff : $(OUT_DOCS)/$(LOCAL_MODULE)-jdiff-docs.zip
+endif
diff --git a/core/tasks/apidiff.mk b/core/tasks/apidiff.mk
index 4eb59af..76e4749 100644
--- a/core/tasks/apidiff.mk
+++ b/core/tasks/apidiff.mk
@@ -18,4 +18,4 @@
 
 .PHONY: api-diff
 
-api-diff: offline-sdk-referenceonly-diff
+api-diff: api-stubs-docs-jdiff