ServiceMode/Android.mk: Specifies both LOCAL_SDK_VERSION (system_current) and LOCAL_PRIVATE_PLATFORM_APIS (true) but should specify only one

Question

I am an Android Firmware developer, working with a source of Android 12. I am facing an issue while I try to build a system application called ServiceMode. I am trying to build this application along with Android build and move it to system partition.

I get the below build error in Android.mk definition written by me: "Specifies both LOCAL_SDK_VERSION (system_current) and LOCAL_PRIVATE_PLATFORM_APIS (true) but should specify only one"

In my makefile I have mentioned only LOCAL_PRIVATE_PLATFORM_APIS := true, since I am using hidden APIs and I haven't mentioned LOCAL_SDK_VERSION. But still I am getting a build error stating that both LOCAL_SDK_VERSION and LOCAL_PRIVATE_PLATFORM_APIS are mentioned in Android.mk

My Android.mk file looks like this:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_SRC_FILES += $(call all-java-files-under, java/com/foo/example/servicemode)
LOCAL_SRC_FILES += $(call all-java-files-under, java/com/bar)

ifeq "$(LOCAL_REGION)" "JP"
    LOCAL_MANIFEST_FILE := java/com/foo/example/servicemodejp/AndroidManifest.xml
    LOCAL_SRC_FILES += $(call all-java-files-under, java/com/foo/example/servicemodejp)
endif

ifeq "$(PROJECT_SERIES)_$(LOCAL_REGION)" "US"
    LOCAL_MANIFEST_FILE := java/com/foo/example/servicemodeus/AndroidManifest.xml
    LOCAL_SRC_FILES += $(call all-java-files-under, java/com/foo/example/servicemodeus)
endif

LOCAL_PACKAGE_NAME := ServiceMode
LOCAL_CERTIFICATE := platform
LOCAL_ODM_MODULE := true
LOCAL_JAVA_LIBRARIES := com.bar.twoworlds.mobile\
    com.foo.example.mobileinput.provider.util \

ifeq "$(LOCAL_REGION)" "JP"
    LOCAL_JAVA_LIBRARIES += com.foo.example.jp
endif

LOCAL_STATIC_JAVA_LIBRARIES := \
    com.foo.example.osdplanevisibilitymanager \
    com.foo.example.provider.modelvariation.util \
    com.foo.example.hardware.display-V1.0-java\
        android-support-annotations

ifeq "$(PROJECT_SERIES)_$(LOCAL_REGION)" "US"
    LOCAL_STATIC_JAVA_LIBRARIES += com.foo.example.mobileapi
endif

LOCAL_PROGUARD_ENABLED := disabled

LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_DEX_PREOPT := false

include $(BUILD_PACKAGE)
    
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := \
    com.foo.example.osdplanevisibilitymanager:libs/com.foo.example.osdplanevisibilitymanager.jar

ifeq "$(PROJECT_SERIES)_$(LOCAL_REGION)" "US"
    LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES += com.foo.example.mobileapi:libs/mobileapi-1.13.0.jar
endif

include $(BUILD_MULTI_PREBUILT)

Answer 1

Apps in vendor/odm/product partitions are not allowd to use private api.

ifdef BOARD_SYSTEMSDK_VERSIONS
  # Apps and jars in vendor, product or odm partition are forced to build against System SDK.
  _cannot_use_platform_apis :=
  ifneq (,$(filter true,$(LOCAL_VENDOR_MODULE) $(LOCAL_ODM_MODULE) $(LOCAL_PROPRIETARY_MODULE)))
    # Note: no need to check LOCAL_MODULE_PATH* since LOCAL_[VENDOR|ODM|OEM]_MODULE is already
    # set correctly before this is included.
    _cannot_use_platform_apis := true
  else ifeq ($(LOCAL_PRODUCT_MODULE),true)
    ifeq ($(PRODUCT_ENFORCE_PRODUCT_PARTITION_INTERFACE),true)
      _cannot_use_platform_apis := true
    endif
  endif
  ifneq (,$(filter JAVA_LIBRARIES APPS,$(LOCAL_MODULE_CLASS)))
    ifndef LOCAL_SDK_VERSION
      ifeq ($(_cannot_use_platform_apis),true)
        ifeq (,$(LOCAL_IS_RUNTIME_RESOURCE_OVERLAY))
          # Runtime resource overlays are exempted from building against System SDK.
          # TODO(b/155027019): remove this, after no product/vendor apps rely on this behavior.
          LOCAL_SDK_VERSION := system_current
        endif
      endif
    endif
  endif
endif

The rule is enforced to make sure that the system img(Android Framework) can be upgraded while the other img are not upgraded.

You have set LOCAL_ODM_MODULE to true, which will caused that LOCAL_SDK_VERSION are set as system_current. Then the error message will be shown.