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# Vcpkg and Android
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**The latest version of this documentation is available on [GitHub](https://github.com/Microsoft/vcpkg/tree/master/docs/users/android.md).**
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*Android is not tested as part of vcpkg repository's CI process, so regressions can occur as part of library updates. PRs improving support are welcome!*
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## Android build requirements
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1. Download the [android ndk](https://developer.android.com/ndk/downloads/)
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2. Set environment variable `ANDROID_NDK_HOME` to your android ndk installation.
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For example:
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````bash
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export ANDROID_NDK_HOME=/home/your-account/Android/Sdk/ndk-bundle
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````
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Or:
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````bash
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export ANDROID_NDK_HOME=/home/your-account/Android/android-ndk-r21b
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````
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3. Install [vcpkg](https://github.com/microsoft/vcpkg)
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4. Set environment variable `VCPKG_ROOT` to your vcpkg installation.
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````bash
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export VCPKG_ROOT=/path/to/vcpkg
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````
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## vcpkg triplets and their corresponding android ABI
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There are four different Android ABI, each of which maps to
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a vcpkg triplet. The following table outlines the mapping from vcpkg architectures to android architectures
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|VCPKG_TARGET_TRIPLET | ANDROID_ABI |
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|---------------------------|----------------------|
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|arm64-android | arm64-v8a |
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|arm-android | armeabi-v7a |
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|x64-android | x86_64 |
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|x86-android | x86 |
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## Install libraries for Android using vcpkg
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Example for jsoncpp:
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````bash
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cd $VCPKG_ROOT
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# specify the triplet like this
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./vcpkg install jsoncpp --triplet arm-android
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# or like this
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./vcpkg install jsoncpp:arm64-android
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./vcpkg install jsoncpp:x86-android
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./vcpkg install jsoncpp:x64-android
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````
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### Using Vulkan SDK
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Vcpkg has a [`vulkan` package](https://github.com/microsoft/vcpkg/blob/master/ports/vulkan/portfile.cmake) which allows you to `find_package(Vulkan)`. To use it you have to provide `VULKAN_SDK` environment variable.
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```bash
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export VULKAN_SDK=/usr/local
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./vcpkg install vulkan
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```
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NDK already contains [Vulkan](https://developer.android.com/ndk/guides/graphics/getting-started) headers and `libvulkan.so` binaries for each of its architecture.
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To expose them to VcPkg, you can consider `export VULKAN_SDK=...` for each installation.
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But by placing `set(ENV{VULKAN_SDK} ...)` in the triplet files, you can skip the tedious work.
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If you are using NDK 21.3.6528147 or earlier version, it will be like the following.
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```cmake
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# In android triplets... (e.g. arm64-android.cmake)
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set(VCPKG_CMAKE_SYSTEM_NAME Android)
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# ...
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# If your API level is 30, libvulkan.so is at $ENV{ANDROID_NDK_HOME}/platforms/android-30/arch-arm64/usr/lib
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set(ENV{VULKAN_SDK} $ENV{ANDROID_NDK_HOME}/sysroot/usr)
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```
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Notice that **the location of the sysroot has changed since NDK 22**. (see https://github.com/android/ndk/issues/1407)
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If you prefer using [the latest version](https://developer.android.com/studio/projects/install-ndk#default-ndk-per-agp), check the [BuildSystemMaintainers.md of the NDK document](https://android.googlesource.com/platform/ndk/+/master/docs/BuildSystemMaintainers.md#sysroot) and then put appropriate path for your system.
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For example, Mac OS users will use the path like this.
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```cmake
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# In android triplets... (e.g. arm64-android.cmake)
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set(VCPKG_CMAKE_SYSTEM_NAME Android)
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# ...
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# If your API level is 30, libvulkan.so is at $ENV{ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/usr/lib/aarch64-linux-android/30
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set(ENV{VULKAN_SDK} $ENV{ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/usr)
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```
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By doing this for all android triplets, you can install `vulkan` and the packages that require it. (e.g. `vulkan-hpp`)
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<details>
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<summary markdown="span">`vcpkg install vulkan-hpp:arm64-android`</summary>
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```console
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user@host$ ./vcpkg install vulkan-hpp:arm64-android
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Computing installation plan...
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The following packages will be built and installed:
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* vulkan[core]:arm64-android -> 1.1.82.1-1
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vulkan-hpp[core]:arm64-android -> 2019-05-11-1
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Additional packages (*) will be modified to complete this operation.
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Detecting compiler hash for triplet arm64-android...
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...
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Starting package 1/2: vulkan:arm64-android
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Building package vulkan[core]:arm64-android...
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-- Using community triplet arm64-android. This triplet configuration is not guaranteed to succeed.
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-- [COMMUNITY] Loading triplet configuration from: /.../vcpkg/triplets/community/arm64-android.cmake
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-- Querying VULKAN_SDK Environment variable
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-- Searching /.../Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/usr/include/vulkan/ for vulkan.h
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-- Found vulkan.h
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-- Performing post-build validation
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-- Performing post-build validation done
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...
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Building package vulkan[core]:arm64-android... done
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Installing package vulkan[core]:arm64-android...
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Installing package vulkan[core]:arm64-android... done
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Elapsed time for package vulkan:arm64-android: 35.9 ms
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Starting package 2/2: vulkan-hpp:arm64-android
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Building package vulkan-hpp[core]:arm64-android...
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-- Using community triplet arm64-android. This triplet configuration is not guaranteed to succeed.
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-- [COMMUNITY] Loading triplet configuration from: /.../vcpkg/triplets/community/arm64-android.cmake
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-- Using cached /.../vcpkg/downloads/KhronosGroup-Vulkan-Hpp-5ce8ae7fd0d9c0543d02f33cfa8a66e6a43e2150.tar.gz
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-- Cleaning sources at /.../vcpkg/buildtrees/vulkan-hpp/src/e6a43e2150-4f344cd911.clean. Use --editable to skip cleaning for the packages you specify.
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-- Extracting source /.../vcpkg/downloads/KhronosGroup-Vulkan-Hpp-5ce8ae7fd0d9c0543d02f33cfa8a66e6a43e2150.tar.gz
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-- Using source at /.../vcpkg/buildtrees/vulkan-hpp/src/e6a43e2150-4f344cd911.clean
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-- Performing post-build validation
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-- Performing post-build validation done
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...
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Building package vulkan-hpp[core]:arm64-android... done
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Installing package vulkan-hpp[core]:arm64-android...
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Installing package vulkan-hpp[core]:arm64-android... done
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Elapsed time for package vulkan-hpp:arm64-android: 144.5 ms
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Total elapsed time: 1.013 s
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The package vulkan-hpp:arm64-android is header only and can be used from CMake via:
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find_path(VULKAN_HPP_INCLUDE_DIRS "vulkan/vulkan.hpp")
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target_include_directories(main PRIVATE ${VULKAN_HPP_INCLUDE_DIRS})
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```
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</details>
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## Consume libraries using vpckg, cmake and the android toolchain
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1. Combine vcpkg and Android toolchains
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vcpkg and android both provide dedicated toolchains:
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````bash
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vcpkg_toolchain_file=$VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake
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android_toolchain_file=$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake
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````
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When using vcpkg, the vcpkg toolchain shall be specified first.
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However, vcpkg provides a way to preload and additional toolchain, with the VCPKG_CHAINLOAD_TOOLCHAIN_FILE option.
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````bash
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cmake \
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-DCMAKE_TOOLCHAIN_FILE=$vcpkg_toolchain_file \
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-DVCPKG_CHAINLOAD_TOOLCHAIN_FILE=$android_toolchain_file \
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...
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````
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2. Specify the android abi and vcpkg triplet
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When compiling for android, you need to select a matching "android abi" / "vcpkg triplet" pair.
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For example:
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````bash
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android_abi=armeabi-v7a
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vcpkg_target_triplet=arm-android
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cmake
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...
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-DVCPKG_TARGET_TRIPLET=$vcpkg_target_triplet \
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-DANDROID_ABI=$android_abi
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````
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### Test on an example
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The folder [docs/examples/vcpkg_android_example_cmake](../examples/vcpkg_android_example_cmake) provides a working example, with an android library that consumes the jsoncpp library:
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*Details*
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* The [CMakeLists](../examples/vcpkg_android_example_cmake/CMakeLists.txt) simply uses `find_package` and `target_link_library`
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* The [compile.sh](../examples/vcpkg_android_example_cmake/compile.sh) script enables you to select any matching pair of "android abi" / "vcpkg triplet" and to test the compilation
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* The dummy [my_lib.cpp](../examples/vcpkg_android_example_cmake/my_lib.cpp) file uses the jsoncpp library
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*Note*: this example only compiles an Android library, as the compilation of a full fledged Android App is beyond the scope of this document.
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### Test on an example, using [vcpkg_android.cmake](../examples/vcpkg_android_example_cmake_script/cmake/vcpkg_android.cmake)
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The folder [docs/examples/vcpkg_android_example_cmake_script](../examples/vcpkg_android_example_cmake_script) provides the same example, and uses a cmake script in order to simplify the usage.
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*Details*
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* The main [CMakeLists](../examples/vcpkg_android_example_cmake_script/CMakeLists.txt) loads [vcpkg_android.cmake](../examples/vcpkg_android_example_cmake_script/cmake/vcpkg_android.cmake) if the flag `VCPKG_TARGET_ANDROID` is set:
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````cmake
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if (VCPKG_TARGET_ANDROID)
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include("cmake/vcpkg_android.cmake")
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endif()
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````
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*Important: place these lines before calling project() !*
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* The [compile.sh](../examples/vcpkg_android_example_cmake_script/compile.sh) script shows that it is then possible to compile for android using a simple cmake invocation, for example:
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````bash
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cmake .. -DVCPKG_TARGET_ANDROID=ON -DANDROID_ABI=armeabi-v7a
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````
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## Consume libraries using vpckg, and Android prefab Archives (AAR files)
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See [prefab.md](../specifications/prefab.md)
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