aar support in Android.mk

Question

I am doing android custom ROM development now. the build system of aosp is based on Android.mk, But I want to include some aar libraries, is it possible to include aar libar

Answer 1

My Android.mk

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

LOCAL_STATIC_JAVA_LIBRARIES += android-support-v7-appcompat
LOCAL_STATIC_JAVA_LIBRARIES += android-common

LOCAL_SRC_FILES := $(call all-java-files-under, app/src)

LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/app/src/main/res
LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/v7/appcompat/res

LOCAL_MANIFEST_FILE :=  app/src/main/AndroidManifest.xml

LOCAL_PACKAGE_NAME := PackageName

LOCAL_SDK_VERSION := current

LOCAL_PROGUARD_FLAG_FILES := app/proguard-rules.pro

LOCAL_AAPT_FLAGS := --auto-add-overlay
LOCAL_AAPT_FLAGS += --extra-packages android.support.v7.appcompat
LOCAL_AAPT_FLAGS += --extra-packages com.exp.librairy

LOCAL_STATIC_JAVA_AAR_LIBRARIES := explibrairy

include $(BUILD_PACKAGE)

#Build aar libs
include $(CLEAR_VARS)
LOCAL_PREBUILT_STATIC_AAR_LIBRARIES := explibrairy:project/build/outputs/aar/explibrairy-debug.aar
include $(BUILD_MULTI_PREBUILT)

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

Answer 2

Kostiantyn Luzan's answer has a problem. After compile, the resources in the aar will be added to my main package's R file, but not in the aar package's R file. For example, the aar's package name is my.aar， the main project's package name is my.main. The aar has a string named "string_in_aar". After compile, the strings id is my.main.R.string_in_aar rather than my.aar.R.string_in_aar. This makes the apk crash, because the code in the aar uses my.aar.R.string_in_aar.

The solution is use: LOCAL_AAPT_FLAGS += --extra-packages {aar package name}. You will get two R file. They has the some content. One's package is the main package, the other is the aar package.

Answer 3

You should add following blocks into your Android.mk

LOCAL_STATIC_JAVA_AAR_LIBRARIES:= <aar alias>
.
.
.
include $(BUILD_PACKAGE)

include $(CLEAR_VARS)

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := <aar alias>:libs/<lib file>.aar

include $(BUILD_MULTI_PREBUILT)

Please also be aware of satisfy minSdkVersion required by library into your manifest file.