Add .so file in Android AOSP source code

Hello Guys !!! Hope You are doing well.
Today I am going to discuss How to add .so file in Android AOSP source code external folder.
You can add your prebuilt library in Android AOSP source code and it be a part of your AOSP System Image. I am describing step by step procedure for it.

Step 1 Create a folder ( let say myLibs) inside external folder of AOSP source code.

external folder of AOSP source code refers to external open source libraries.
That means libraries that the Android platform depend upon but that are not primarily developed and maintained by the Android open source project.

examples are webkit for the browser, FreeType for fonts, SqlLite for databases and so on. As more features are added to Android, more of these libraries are included in external.

Step 2 Create a Android.mk file

Create a Android.mk file inside your folder(let say myLibs) and copy your .so file in it.
You can use following content for your android.mk file

# Prebuilt Lib
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libMyabc # your lib name
LOCAL_SRC_FILES := libMyabc.so
# your lib .so file name
include $(BUILD_SHARED_LIBRARY)

Step 3 Add your library in Framework

In final step you have to add your library in Android AOSP framework makefile so that it will recognise and build as a part of System image.
You find Framework Android.mk file on following location
/android_aosp_sourcecode_download_folder/frameworks/base/core/jni/
Open Android.mk file and add your library in following section
LOCAL_SHARED_LIBRARIES := \
You can put your library name in that section example libMyabc \
That's it... now make it (make -j4) and you find your added so file in following folder
/android_aosp_sourcecode_download_folder/out/target/product/generic/obj/lib
with file name like :- libMyabc.so and libMyabc.so.toc
and you also found it in system/lib folder
/android_aosp_sourcecode_download_folder/out/target/product/system/lib

If you want to add .so files directly in your app, Then add below flag in your Android.mk file

LOCAL_PATH := $(call my-dir)
	include $(CLEAR_VARS)
	LOCAL_MODULE := AndroidMediaShell
	LOCAL_PRIVILEGED_MODULE := true
	LOCAL_MODULE_TAGS := optional
	LOCAL_MODULE_CLASS := APPS
	LOCAL_SRC_FILES := app/$(LOCAL_MODULE).apk
	LOCAL_PREBUILT_JNI_LIBS := (complete_path*)lib/your_lin_so_file.so
	LOCAL_MODULE_TARGET_ARCH := arm or arm64 or x86
	LOCAL_CERTIFICATE := PRESIGNED
	LOCAL_OVERRIDES_PACKAGES :=
	include $(BUILD_PREBUILT)

* If .so files in your current app lib folder then path is  lib/your_so_file.so

Thanks

Saurabh

Happy Coding!!!!