Add NDK

ndk/Dockerfile

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+# Android Dockerfile based on uber/android-build-environment
+
+FROM ubuntu:18.04
+
+# SDK version
+ENV ANDROID_SDK_VERSION 4333796
+ENV PLATFORM_VERSION 28
+ENV BUILD_TOOLS_VERSION 28.0.2
+
+# Never ask for confirmations
+ENV DEBIAN_FRONTEND noninteractive
+
+# Update apt-get
+RUN apt-get -qq update \
+  && apt-get -qq install -y --no-install-recommends \
+      software-properties-common \
+      unzip \
+      wget \
+      zip \
+      xxd \
+  && apt-add-repository ppa:openjdk-r/ppa \
+  && apt-get -qq update \
+  && apt-get -qq install -y openjdk-8-jdk \
+      -o Dpkg::Options::="--force-overwrite" \
+  && apt-get -qq autoremove -y \
+  && apt-get -qq clean \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install Android SDK
+RUN wget https://dl.google.com/android/repository/sdk-tools-linux-$ANDROID_SDK_VERSION.zip -q \
+  && mkdir /usr/local/android \
+  && unzip -q sdk-tools-linux-$ANDROID_SDK_VERSION.zip -d /usr/local/android \
+  && rm sdk-tools-linux-$ANDROID_SDK_VERSION.zip
+
+# Export JAVA_HOME variable
+ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64
+
+# Environment variables
+ENV ANDROID_HOME /usr/local/android
+ENV ANDROID_SDK_HOME $ANDROID_HOME
+ENV ANDROID_NDK_HOME $ANDROID_HOME/ndk-bundle
+ENV PATH $ANDROID_HOME/tools/bin:$ANDROID_HOME/build-tools/$BUILD_TOOLS_VERSION:$PATH
+
+# Install Android SDK components
+RUN echo "y" | sdkmanager \
+  "ndk-bundle" \
+  "lldb;3.1" \
+  "cmake;3.6.4111459" \
+  "extras;google;m2repository" \
+  "platform-tools" \
+  "platforms;android-$PLATFORM_VERSION" \
+  "build-tools;$BUILD_TOOLS_VERSION"
+
+# Add release helper
+COPY release /usr/local/bin/release
+
+# Build directory
+ENV SRC /src
+RUN mkdir $SRC
+WORKDIR $SRC
+
+RUN echo "sdk.dir=$ANDROID_HOME" > local.properties
+RUN echo "ndk.dir=$ANDROID_HOME" > local.properties
+
+CMD ["./gradlew", "build"]

ndk/release

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+set -e
+
+BUILT_APK=none
+ALIGNED_APK=app/build/outputs/apk/release/app-release-unsigned-aligned.apk
+SIGNED_APK=app/build/outputs/apk/release/app-release.apk
+# Ensure directory exists
+mkdir -p app/build/outputs/apk/release/
+
+TEMP_DIR="$(mktemp -d)"
+TEMP_STORE_FILE="$TEMP_DIR/store.jks"
+
+if [ -z "$STORE_FILE" ] || [ -z "$STORE_PASSWORD" ] || [ -z "$KEY_ALIAS" ]; then
+    echo "STORE_FILE, STORE_PASSWORD or KEY_ALIAS are not configured secrets. Aborting..."
+    exit 1
+fi
+
+echo
+echo "Reading STORE_FILE from environment"
+echo $STORE_FILE | xxd -ps -r > $TEMP_STORE_FILE
+
+# The following file is not required for the following process
+# but I'm gonna leave it here anyway
+echo > keystore.properties << EOF
+storeFile=$TEMP_STORE_FILE
+storePassword=$STORE_PASSWORD
+keyAlias=$KEY_ALIAS
+EOF
+
+echo
+echo "I think you're lazy so we will build a unsigned release APK and then sign it manually,"
+echo "rather than using the gradle process."
+
+echo
+echo "Building unsigned release APK"
+set -x
+./gradlew assembleRelease
+set +x
+
+BUILT_APK=$(find . -name "*.apk")
+
+echo
+echo "Doing zipalign"
+set -x
+zipalign -v -p 4 $BUILT_APK $ALIGNED_APK
+set +x
+
+echo
+echo "Signing"
+set -x
+apksigner sign \
+    --ks $TEMP_STORE_FILE \
+    --ks-pass pass:$STORE_PASSWORD \
+    --ks-key-alias $KEY_ALIAS \
+    --out $SIGNED_APK \
+    $ALIGNED_APK
+set +x
+
+echo
+echo "Verifying"
+set -x
+apksigner verify $SIGNED_APK
+set +x
+
+echo "Done!"