BuildingForAndroid

Build on Android* Systems

This section describes how to build Inference Engine for Android operating systems.

Table of content

• Software Requirements
• Build Steps

Software Requirements

• CMake* 3.13 or higher
• Android NDK (this guide has been validated with r20 release)

Build Steps

1. Download and unpack Android NDK: https://developer.android.com/ndk/downloads. Let's assume that ~/Downloads is used as a working folder.

cd ~/Downloads
wget https://dl.google.com/android/repository/android-ndk-r20-linux-x86_64.zip

unzip android-ndk-r20-linux-x86_64.zip
mv android-ndk-r20 android-ndk

2. Clone submodules

cd openvino
git submodule update --init --recursive

3. Create a build folder:

  mkdir build

4. Change working directory to build and run cmake to create makefiles. Then run make.

cd build

cmake .. \
  -DCMAKE_TOOLCHAIN_FILE=~/Downloads/android-ndk/build/cmake/android.toolchain.cmake \
  -DANDROID_ABI=x86_64 \
  -DANDROID_PLATFORM=21 \
  -DANDROID_STL=c++_shared \
  -DENABLE_OPENCV=OFF

make --jobs=$(nproc --all)

• ANDROID_ABI specifies target architecture:
  • x86_64 for x64 build
  • armeabi-v7a with NEON for ARM with NEON support
  • arm64-v8a for ARM 64 bits
• ANDROID_PLATFORM - Android API version
• ANDROID_STL specifies that shared C++ runtime is used. Copy ~/Downloads/android-ndk/sources/cxx-stl/llvm-libc++/libs/x86_64/libc++_shared.so from Android NDK along with built binaries

5. To reduce the binaries size, use strip tool from NDK:

~/Downloads/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/x86_64-linux-android/bin/strip openvino/bin/intel64/Release/lib/*.so