How to package prebuilt shared library inside an APK

In order to prebuild your native library you have to

1. Create jni folder in your project folder
2. Create libs folder in your project folder

3. Add Adnroid.mk make file to the jni folder, it should looks like this:

   LOCAL_PATH := $(call my-dir)
   
   include $(CLEAR_VARS)
   
   LOCAL_LDLIBS    := -llog
   LOCAL_MODULE    := Test
   LOCAL_SRC_FILES := Test.cpp
   
   include $(BUILD_SHARED_LIBRARY)
   

Note 1: Test.cpp is the main library source file containing implementation of native methods. You can add more sources as a space separated list.

Note 2: Do not include headers, they are included automatically.

Note 3: If you need to enable C++ STL, then create another make file - Application.mk, add it to the jni folder and set APP_STL := stlport_static flag in it.

Then you will have to set up a builder. Refer to this article for how to do that:

After these steps, the builder will create your library in the libs folder which will be automatically packed into the apk when building the whole application.

Note: Your library name should be lowercase, it is a Linux convention. The "lib" prefix will be automatically added, so the final library name will be libtest.so.