Building Third-Party Code in Android Studio using CMake

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First, make sure you have installed both the Android Studio and the Android NDK. You can download them from their respective websites.

2. Create or open an existing Android Studio project that uses Gradle as its build system. If you’re starting a new project, select “Start a New Project” in the welcome screen and choose “Basic Activity.” Then follow the prompts to set up your project.

3. Add the third-party library source code to your project by copying it into a subdirectory of your main project directory (e.g., `libs/third_party`). Make sure you have all the necessary files, including header and implementation files for any C or C++ libraries that need to be built.

4. Create a new file called `CMakeLists.txt` in the root of your project directory (i.e., outside the subdirectory containing the third-party library source code). This is where you’ll define how CMake should build and package the library for use by your Android app.

5. Add the following lines to `CMakeLists.txt`:

# Set the project name
project(MyApp)

# Set the target architecture for the Android device
set(CMAKE_ANDROID_ARCH_ABI "armeabi-v7a") # replace with appropriate architecture for your device

# Find the Android platform and set the required STL (Standard Template Library)
find_package(Android NAMES AndroidPlatform.cmake ANDROID_STL REQUIRED)

# Include the android.toolchain.cmake file from the Android platform path
include(${ANDROID_PLATFORM_PATH}/android.toolchain.cmake)

# Add a subdirectory for the third-party library source code
add_subdirectory(libs/third_party) # replace with the name of your subdirectory containing third-party library source code

6. In `CMakeLists.txt`, add a target for the third-party library by adding the following lines:

# Set the name of the third-party library
set(THIRDPARTY_LIB_NAME "third_library")

# Find the third-party library using the find_package command
find_package(ThirdPartyLibrary REQUIRED)

# Include the directories of the third-party library in the project
include_directories(${ThirdPartyLibrary_INCLUDE_DIRS})

# Add the subdirectory containing the third-party library source code to the project
# Use EXCLUDE_FROM_ALL to exclude it from the default build target
add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/../libs/third_library ${CMAKE_CURRENT_LIST_DIR} EXCLUDE_FROM_ALL)

# Set the include directories for the third-party library
set(THIRDPARTY_LIB_INCLUDE_DIRS "${ThirdPartyLibrary_INCLUDE_DIRS}")

# Set the libraries for the third-party library
set(THIRDPARTY_LIB_LIBRARIES "${ThirdPartyLibrary_LIBRARIES}")

# Create a static imported library target for the third-party library
add_library(${THIRDPARTY_LIB_NAME} STATIC IMPORTED)

# Set the properties for the third-party library target
set_target_properties(${THIRDPARTY_LIB_NAME} PROPERTIES 
    VERSION "1.0" # Set the version of the library
    OUTPUT_NAME "${THIRDPARTY_LIB_NAME}" # Set the output name of the library
    ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/libs/third_library # Set the output directory for the library archive
)

# Add the third-party library target to the list of dependencies for the main app target
set(TARGET_DEPENDS ${THIRDPARTY_LIB_NAME})

7. In `build.gradle`, add the following lines:

// This script adds dependencies to the project
dependencies {
    // The following line adds all jar files in the 'libs' directory to the project
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    // The following line adds the third-party library source code from the specified subdirectory
    implementation project(':third_party') // replace with appropriate name of your subdirectory containing third-party library source code
}

8. Run `gradle clean assembleDebug` to build and package the app, including the third-party library.

9. If you encounter any issues or errors during this process, check out the Android NDK documentation for more information on using CMake with Gradle. You can also consult the official Haskell documentation for guidance on learning Haskell.

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