CODEWITHSUNDEEP
androidbuildandroid-source
Almas Dusal
Almas Dusal

Reputation: 663

How to make custom Android Shared library publicly available?

About the Android Shared library.

We added the system shared library to the Android source code with the following code:

Android.bp:

cc_prebuilt_library_shared {
    name: "libfilamat-jni",
    arch: {
        arm64: {
            srcs: ["jniLibs/arm64-v8a/libfilamat-jni.so"],
        },
        arm: {
            srcs: ["jniLibs/armeabi-v7a/libfilamat-jni.so"],
        },
        x86_64: {
            srcs: ["jniLibs/x86_64/libfilamat-jni.so"],
        },
    },
    installable: true,
    stem: "libfilamat-jni",
    relative_install_path: "",
    shared_libs: ["liblog"],
    strip: {
        none: true,
    },
}

Same as other files.

product.mk

PRODUCT_PACKAGES += \
    libfilamat-jni \
    libfilament-jni \
    libgltfio-jni \
    libfilament-utils-jni

Then, the .so libraries copied to the /system/lib64 and app is working as a System app.

However, if we install over it with adb install command then app stops to access .so file and failing.

I confirmed that if we add .so file's name to the file /system/etc/public.libraries.txt then, problem will be resolved.

However, now I can not find the way to append the file name to the /system/etc/public.libraries.txt with Android.bp, product.mk or some kind of way to do it with the Android build system.

Or, are there any other way to achieve this?

Upvotes: 0

Views: 31

Answers (1)

Almas Dusal
Almas Dusal

Reputation: 663

Finally, I got the answer. We can add the file names to following file before build. It will be copied to the /system/etc/public.libraries.txt when build.

system/core/rootdir/etc/public.libraries.android.txt

product.mk:

LOCAL_PATH := vendor/path-to/my-module-dir

PUBLIC_LIBRARIES_PATH := system/core/rootdir/etc/public.libraries.android.txt

# Maybe file already exists. Therefore, we carefully append it.
$(shell touch $(PUBLIC_LIBRARIES_PATH))
$(shell while read -r line; do \
    if ! grep -q "$$line" $(PUBLIC_LIBRARIES_PATH); then \
        echo "$$line" >> $(PUBLIC_LIBRARIES_PATH); \
    fi; \
done < $(LOCAL_PATH)/etc/public.libraries.txt)

Upvotes: 0

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