example

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Android example

To compile example to shared library you will need Android NDK. To build Android apk you will need Android SDK.

Export path to Android NDK, point to location where you have unpacked archive:

export ANDROID_NDK_HOME=/opt/android-ndk

Add toolchain bin directory to PATH:

export PATH=${ANDROID_NDK_HOME}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:${PATH}

Export sysroot and libdirs:

export ANDROID_SYSROOT=${ANDROID_NDK_HOME}/sysroot
export ANDROID_PLATFORM=${ANDROID_NDK_HOME}/platforms/android-16/arch-arm
export ANDROID_TOOLCHAIN=${ANDROID_NDK_HOME}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64

And compile shared library:

CC="arm-linux-androideabi-gcc" \
CGO_CFLAGS="-I${ANDROID_SYSROOT}/usr/include -I${ANDROID_SYSROOT}/usr/include/arm-linux-androideabi --sysroot=${ANDROID_SYSROOT} -D__ANDROID_API__=16" \
CGO_LDFLAGS="-L${ANDROID_SYSROOT}/usr/lib/arm-linux-androideabi -L${ANDROID_PLATFORM}/usr/lib -L${ANDROID_TOOLCHAIN}/arm-linux-androideabi/lib -L${ANDROID_TOOLCHAIN}/lib/gcc/arm-linux-androideabi/4.9.x --sysroot=${ANDROID_PLATFORM}" \
CGO_ENABLED=1 GOOS=android GOARCH=arm \
go build -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

Or with gradle:

./gradlew assembleDebug

If everything is successfully built apk can be found in bin/ directory or in the android/build/outputs in case gradle is used.