image with android-sdk and gradle

Dockerfile

FROM openjdk:8u141-jdk-slim

ENV ANDROID_HOME /opt/android-sdk
ARG ANDROID_BUILD_TOOLS_VERSION=25.0.0
ARG ANDROID_SDK_TOOLS_SHA256=444e22ce8ca0f67353bda4b85175ed3731cae3ffa695ca18119cbacef1c1bea0
ARG ANDROID_SDK_TOOLS_FILE=sdk-tools-linux-3859397.zip

ARG GRADLE_VERSION=3.5.1
ARG GRADLE_SHA256=8dce35f52d4c7b4a4946df73aa2830e76ba7148850753d8b5e94c5dc325ceef8
ENV GRADLE_HOME /opt/gradle-${GRADLE_VERSION}

ENV PATH ${PATH}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools:${GRADLE_HOME}/bin

RUN echo "-= update packages list =-" \
    && apt-get update \
    && echo "-= install curl =-" \
    && apt-get install curl -y \
    # android sdk (https://developer.android.com/studio/index.html#command-tools)
    && echo "-= download Android SDK Tools =-" \
    && curl -SLO "https://dl.google.com/android/repository/${ANDROID_SDK_TOOLS_FILE}" \
    && echo "-= check Android SDK Tools hash =-" \
    && echo "${ANDROID_SDK_TOOLS_SHA256} *${ANDROID_SDK_TOOLS_FILE}" | sha256sum -c - \
    && echo "-= install Android SDK Tools =-" \
    && mkdir -p "${ANDROID_HOME}" \
    && unzip "${ANDROID_SDK_TOOLS_FILE}" -d "${ANDROID_HOME}" \
    && rm -Rf "${ANDROID_SDK_TOOLS_FILE}" \
    && echo "-= install Android SDK Components =-" \
    && echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;${ANDROID_BUILD_TOOLS_VERSION}" \
    && echo "-= accept install Android SDK Licenses =-" \
    && yes | ${ANDROID_HOME}/tools/bin/sdkmanager --licenses \
    # gradle (https://gradle.org/releases/)
    && echo "-= download Gradle =-" \
    && curl -SLO "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
    && echo "-= check check Gradle hash =-" \
    && echo "${GRADLE_SHA256} *gradle-${GRADLE_VERSION}-bin.zip" | sha256sum -c - \
    && echo "-= install Gradle =-" \
    && mkdir -p "${GRADLE_HOME}" \
    && unzip "gradle-${GRADLE_VERSION}-bin.zip" -d "/opt" \
    && rm -f "gradle-${GRADLE_VERSION}-bin.zip" \
    # gnupg
    && echo "-= install GnuPG =-" \
    && apt-get install gnupg -y