fix automatized android artifact build

src/csharp/experimental/build_native_ext_for_android.sh

@@ -23,18 +23,20 @@ mkdir -p build
 cd build
 
 # set to the location where Android SDK is installed
-ANDROID_SDK_PATH="$HOME/Android/Sdk"
+# e.g. ANDROID_SDK_PATH="$HOME/Android/Sdk"
 
 # set to location where Android NDK is installed, usually a subfolder of Android SDK
-# install the Android NDK through the Android SDK Manager
-ANDROID_NDK_PATH=${ANDROID_SDK_PATH}/ndk-bundle
+# to install the Android NKD, use the "sdkmanager" tool
+# e.g. ANDROID_NDK_PATH=${ANDROID_SDK_PATH}/ndk-bundle
 
-# set to location of the cmake executable
-# by default, use cmake binary from the Android SDK
-CMAKE_PATH="${ANDROID_SDK_PATH}/cmake/3.6.4111459/bin/cmake"
+# set to location of the cmake executable from the Android SDK
+# to install cmake, use the "sdkmanager" tool
+# e.g. ANDROID_SDK_CMAKE=${ANDROID_SDK_PATH}/cmake/3.6.4111459/bin/cmake
 
 # ANDROID_ABI in ('arm64-v8a', 'armeabi-v7a')
-${CMAKE_PATH} ../.. \
+# e.g. ANDROID_ABI=armeabi-v7a
+
+${ANDROID_SDK_CMAKE} ../.. \
   -DCMAKE_TOOLCHAIN_FILE="${ANDROID_NDK_PATH}/build/cmake/android.toolchain.cmake" \
   -DCMAKE_ANDROID_NDK="${ANDROID_NDK_PATH}" \
   -DCMAKE_ANDROID_STL_TYPE=c++_static \
@@ -43,8 +45,7 @@ ${CMAKE_PATH} ../.. \
   -DRUN_HAVE_STEADY_CLOCK=0 \
   -DCMAKE_BUILD_TYPE=Release \
   -DANDROID_PLATFORM=android-28 \
-  -DANDROID_ABI=arm64-v8a \
+  -DANDROID_ABI="${ANDROID_ABI}" \
   -DANDROID_NDK="${ANDROID_NDK_PATH}"
 
 make -j4 grpc_csharp_ext
-

tools/dockerfile/grpc_artifact_android_ndk/Dockerfile

@@ -12,9 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Docker file for building gRPC artifacts.
+# Docker file for building gRPC artifacts for Android.
 
-# Recent enough cmake (>=3.9) needed by Android SDK
 FROM debian:sid
 
 RUN apt-get update && apt-get install -y debian-keyring && apt-key update
@@ -47,20 +46,26 @@ RUN apt-get update && apt-key update && apt-get install -y \
   wget \
   zip && apt-get clean
 
-# Cmake for cross-compilation
-RUN apt-get update && apt-get install -y cmake golang && apt-get clean
+# golang needed to build BoringSSL with cmake
+RUN apt-get update && apt-get install -y golang && apt-get clean
 
-##################
-# Android NDK
+# Java required by Android SDK
+RUN apt-get update && apt-get -y install openjdk-8-jdk && apt-get clean
 
-# Download and install Android NDK
-RUN wget -q https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip -O android_ndk.zip \
-    && unzip -q android_ndk.zip \
-    && rm android_ndk.zip \
-    && mv ./android-ndk-r16b /opt
-ENV ANDROID_NDK_PATH /opt/android-ndk-r16b
+# Install Android SDK
+ENV ANDROID_SDK_VERSION 4333796
+RUN mkdir -p /opt/android-sdk && cd /opt/android-sdk && \
+    wget -q https://dl.google.com/android/repository/sdk-tools-linux-${ANDROID_SDK_VERSION}.zip && \
+    unzip -q sdk-tools-linux-${ANDROID_SDK_VERSION}.zip && \
+    rm sdk-tools-linux-${ANDROID_SDK_VERSION}.zip
+ENV ANDROID_SDK_PATH /opt/android-sdk
 
-RUN apt-get update && apt-get install -y libpthread-stubs0-dev && apt-get clean
+# Install Android NDK and cmake using sdkmanager
+RUN mkdir -p ~/.android && touch ~/.android/repositories.cfg
+RUN yes | ${ANDROID_SDK_PATH}/tools/bin/sdkmanager --licenses  # accept all licenses
+RUN ${ANDROID_SDK_PATH}/tools/bin/sdkmanager ndk-bundle 'cmake;3.6.4111459'
+ENV ANDROID_NDK_PATH ${ANDROID_SDK_PATH}/ndk-bundle
+ENV ANDROID_SDK_CMAKE ${ANDROID_SDK_PATH}/cmake/3.6.4111459/bin/cmake
 
 RUN mkdir /var/local/jenkins
 

tools/run_tests/artifacts/build_artifact_csharp_android.sh

@@ -17,6 +17,7 @@ set -ex
 
 cd "$(dirname "$0")/../../.."
 
+export ANDROID_ABI=armeabi-v7a
 src/csharp/experimental/build_native_ext_for_android.sh
 
 mkdir -p "${ARTIFACTS_OUT}"