Define a custom Android SDK addon with java sources, aidl, JNI part and droiddoc

Android.mk

LOCAL_PATH := $(call my-dir)

# ============================================================
# Build the library
# ============================================================
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
    $(call all-java-files-under,src) \
    $(call all-subdir-Iaidl-files)
LOCAL_AIDL_INCLUDES += $(LOCAL_PATH)/src/
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE:= com.example.hello
LOCAL_DEX_PREOPT := false
LOCAL_JAVA_LIBRARIES := \
    services
include $(BUILD_JAVA_LIBRARY)

# ============================================================
# Generate offline docs (build/make/core/droiddoc.mk)
# ============================================================
include $(CLEAR_VARS)
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_MODULE:= com.example.hello-docs
LOCAL_MODULE_CLASS := JAVA_LIBRARIES
LOCAL_JAVA_LIBRARIES := \
    services

# Specifies the search paths for intermediates (Ex: *.java files generated by *.aidl)
LOCAL_ADDITIONAL_JAVA_DIR := \
    $(call intermediates-dir-for,JAVA_LIBRARIES,com.example.hello,,COMMON)

# Use Standard Doclet instead of Doclava (a new javadoc doclet written by Google for Android Developer Docs)
LOCAL_DROIDDOC_USE_STANDARD_DOCLET := true

include $(BUILD_DROIDDOC)

# ============================================================
# The JNI component
# Also build all of the sub-targets under this one: the library's
# associated JNI code, and a sample client of the library.
# ============================================================
include $(CLEAR_VARS)

include $(call all-makefiles-under,$(LOCAL_PATH))

device.mk

# ============================================================
# SDK Add-On (build/make/core/tasks/sdk-addon.mk)
# ============================================================
ifeq (,$(ONE_SHOT_MAKEFILE))
# Real name of the add-on. This is the name used to build the add-on.
# Use 'make PRODUCT-<PRODUCT_NAME>-sdk_addon' to build the add-on.
# If they didn't define PRODUCT_SDK_ADDON_NAME, then we won't define
# any of sdk_addon rules.
PRODUCT_SDK_ADDON_NAME := hello_my_addon
endif   ##end of ifeq (,$(ONE_SHOT_MAKEFILE))

# Copy the manifest and hardware files for the SDK add-on.
PRODUCT_SDK_ADDON_COPY_FILES := \
    vendor/hello/your/path/sdk_addon/manifest.ini:manifest.ini \
    another/path/source.properties:source.properties

# Rules for public APIs
PRODUCT_SDK_ADDON_STUB_DEFS := \
    another/path/addon_stub_defs

# Copy the jar files for the optional libraries that are exposed as APIs.
PRODUCT_SDK_ADDON_COPY_MODULES := \
    com.example.hello:libs/com.example.hello.jar

# Name of the doc to generate and put in the add-on. 
# This must match the name defined in the optional library with the tag
PRODUCT_SDK_ADDON_DOC_MODULES := \
    com.example.hello-docs

PRODUCT_SDK_ADDON_SYS_IMG_SOURCE_PROP := \
    another/path/source.properties
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