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Add Android instructions and bootstrap script

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This commit is contained in:
Milan Nikolic 2017-01-29 00:58:16 +01:00
parent 96cd196d32
commit 55dd52f386
3 changed files with 133 additions and 0 deletions
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36
examples/android/example/README.md Normal file
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### Android example
To compile example to shared library you will need [Android NDK](https://developer.android.com/ndk/downloads/index.html).
To build Android apk you will need [Android SDK](http://developer.android.com/sdk/index.html#Other).
Download and unpack archives somewhere.
Go must be cross compiled for android. There is a bootstrap.sh script that you can use to compile Go and OpenAL for android/arm and android/arm64.
Export path to Android NDK, point to location where you have unpacked archive:
export ANDROID_NDK_HOME=/opt/android-ndk
Compile Go, OpenAL and android_native_app_glue, /usr/local is prefix where Go and Android toolchains will be installed:
./bootstrap.sh /usr/local
After build is complete point GOROOT to new Go installation in /usr/local, and add toolchain bin directory to PATH:
export GOROOT=/usr/local/go
export PATH=/usr/local/android-arm7/bin:${PATH}
And compile shared library:
CGO_CFLAGS="-I/usr/local/android-arm7/include" CGO_LDFLAGS="-L/usr/local/android-arm7/lib" CC=arm-linux-androideabi-gcc CGO_ENABLED=1 GOOS=android GOARCH=arm \
${GOROOT}/bin/go build -work -v -x -buildmode=c-shared -ldflags="-s -w -extldflags=-Wl,-soname,libexample.so" -o=android/libs/armeabi-v7a/libexample.so
To build apk export path to Android SDK, point to location where you unpacked archive:
export ANDROID_HOME=/opt/android-sdk
And build apk with ant:
cd android
ant clean debug
If everything is successfully built apk can be found in bin/ directory.

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examples/android/example/bootstrap.sh Executable file
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#!/bin/sh
if [ -z "$ANDROID_NDK_HOME" ]; then
echo "You must define ANDROID_NDK_HOME before starting. It should point to your NDK directories."
exit 1
fi
if [ -z "$1" ]; then
echo "Usage: bootstrap.sh <install prefix>"
exit 1
fi
GO_OS="linux"
GO_ARCH="amd64"
GO_VERSION=`curl -s https://golang.org/dl/ | grep 'id="go' | head -n1 | awk -F'"' '{print $4}'`
OPENAL_VERSION="1.17.2"
INSTALL_PREFIX="$1"
export PATH=${INSTALL_PREFIX}/android-arm7/bin:${INSTALL_PREFIX}/android-arm64/bin:${PATH}
BUILD_DIR=`mktemp -d`
mkdir -p ${BUILD_DIR}/bootstrap
echo "Make standalone android toolchains"
${ANDROID_NDK_HOME}/build/tools/make-standalone-toolchain.sh --platform=android-9 --install-dir=${INSTALL_PREFIX}/android-arm7 --toolchain=arm-linux-androideabi-4.9
${ANDROID_NDK_HOME}/build/tools/make-standalone-toolchain.sh --platform=android-21 --install-dir=${INSTALL_PREFIX}/android-arm64 --toolchain=aarch64-linux-android-4.9
echo "Download Go binaries"
cd ${BUILD_DIR}/bootstrap && curl -s -L http://storage.googleapis.com/golang/${GO_VERSION}.${GO_OS}-${GO_ARCH}.tar.gz | tar xz
echo "Download Go source"
cd ${BUILD_DIR} && curl -s -L http://storage.googleapis.com/golang/${GO_VERSION}.src.tar.gz | tar xz && cd ${BUILD_DIR}/go/src
echo "Compile Go for host"
GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go ./make.bash || exit 1
echo "Compile Go for arm-linux-androideabi"
GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go CC_FOR_TARGET=arm-linux-androideabi-gcc GOOS=android GOARCH=arm CGO_ENABLED=1 ./make.bash --no-clean || exit 1
echo "Compile Go for aarch64-linux-android"
GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go CC_FOR_TARGET=aarch64-linux-android-gcc GOOS=android GOARCH=arm64 CGO_ENABLED=1 ./make.bash --no-clean || exit 1
cp -r -f ${BUILD_DIR}/go ${INSTALL_PREFIX}
echo "Compile OpenAL"
cd ${BUILD_DIR} && curl -s -L http://kcat.strangesoft.net/openal-releases/openal-soft-${OPENAL_VERSION}.tar.bz2 | tar -xj
cat << EOF > ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/android-arm7.cmake
set(TOOLCHAIN_PREFIX arm-linux-androideabi)
set(CMAKE_C_COMPILER \${TOOLCHAIN_PREFIX}-gcc)
set(CMAKE_FIND_ROOT_PATH \${INSTALL_PREFIX}/android-arm7)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
EOF
cat << EOF > ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/android-arm64.cmake
set(TOOLCHAIN_PREFIX aarch64-linux-android)
set(CMAKE_C_COMPILER \${TOOLCHAIN_PREFIX}-gcc)
set(CMAKE_FIND_ROOT_PATH \${INSTALL_PREFIX}/android-arm64)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
EOF
mkdir -p ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-arm7
cd ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-arm7
cmake -DLIBTYPE=STATIC -DCMAKE_TOOLCHAIN_FILE=../android-arm7.cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX}/android-arm7 ..
make -j $(nproc) && make install
mkdir -p ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-arm64
cd ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-arm64
cmake -DLIBTYPE=STATIC -DCMAKE_TOOLCHAIN_FILE=../android-arm64.cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX}/android-arm64 ..
make -j $(nproc) && make install
echo "Compile android_native_app_glue"
mkdir -p ${BUILD_DIR}/native_app_glue/jni
cp -r ${ANDROID_NDK_HOME}/sources/android/native_app_glue/* ${BUILD_DIR}/native_app_glue/jni/
echo "APP_ABI := armeabi-v7a arm64-v8a" > ${BUILD_DIR}/native_app_glue/jni/Application.mk
cd ${BUILD_DIR}/native_app_glue && ${ANDROID_NDK_HOME}/ndk-build
cp ${BUILD_DIR}/native_app_glue/obj/local/armeabi-v7a/libandroid_native_app_glue.a ${INSTALL_PREFIX}/android-arm7/lib/
cp ${BUILD_DIR}/native_app_glue/obj/local/arm64-v8a/libandroid_native_app_glue.a ${INSTALL_PREFIX}/android-arm64/lib/
cp ${ANDROID_NDK_HOME}/sources/android/native_app_glue/android_native_app_glue.h ${INSTALL_PREFIX}/android-arm7/include/
cp ${ANDROID_NDK_HOME}/sources/android/native_app_glue/android_native_app_glue.h ${INSTALL_PREFIX}/android-arm64/include/
echo "Remove build directory"
rm -rf ${BUILD_DIR}