Use Prebuilt C++ library from LiteRT Maven

You can use prebuilt C++ library from the LiteRT Maven package for your Android applications without building the entire LiteRT source tree. The integration can be done with CMake.

The following shows basic steps to use LiteRT CompiledModel API in your C++ NDK code.

Integrate prebuilt LiteRT C++ library

Choose a folder to host LiteRT C++ SDK. We'll refer to it as <litert_cc_sdk_location>.

1. Download C++ SDK

   You need to prepare the necessary files (CMakeLists.txt, source and header files) from LiteRT C++ SDK zip file under <litert_cc_sdk_location>.

   wget https://github.com/google-ai-edge/LiteRT/releases/download/<litert_version>/litert_cc_sdk.zip
   unzip litert_cc_sdk.zip -d <litert_cc_sdk_location>
   

2. Place libLiteRt.so from the LiteRT Maven package under <litert_cc_sdk_location>.

   cp <path_to_prebuilt_lib>/libLiteRt.so <litert_cc_sdk_location>/litert_cc_sdk/
   

3. Update your CMakeLists.txt to use LiteRT API.

   add_subdirectory("<litert_cc_sdk_location>" "<litert_cc_sdk_location>/build")
   include_directories("<litert_cc_sdk_location>")
   
   target_link_libraries(${CMAKE_PROJECT_NAME}
           # Use `litert_cc_api` for LiteRT C++ SDK
           litert_cc_api
           android
           log)
   

4. Update your build.gradle.kts to configure LiteRT C++ SDK.

       externalNativeBuild {
           cmake {
               path = file("<litert_cc_sdk_location>/CMakeLists.txt")
               version = "3.22.1"
           }
       }