{
  # If you copy this example out of nixpkgs, use these lines instead of the next.
  # This example pins nixpkgs: https://nix.dev/tutorials/towards-reproducibility-pinning-nixpkgs.html
  /*nixpkgsSource ? (builtins.fetchTarball {
    name = "nixpkgs-20.09";
    url = "https://github.com/NixOS/nixpkgs/archive/20.09.tar.gz";
    sha256 = "1wg61h4gndm3vcprdcg7rc4s1v3jkm5xd7lw8r2f67w502y94gcy";
  }),
  pkgs ? import nixpkgsSource {
    config.allowUnfree = true;
  },
  */

  # If you want to use the in-tree version of nixpkgs:
  pkgs ? import ../../../../.. {
    config.allowUnfree = true;
  },

  config ? pkgs.config
}:

# Copy this file to your Android project.
let
  # Declaration of versions for everything. This is useful since these
  # versions may be used in multiple places in this Nix expression.
  android = {
    versions = {
      cmdLineToolsVersion = "8.0";
      platformTools = "33.0.3";
      buildTools = "30.0.3";
      ndk = [
        "25.1.8937393" # LTS NDK
        "24.0.8215888"
      ];
      cmake = "3.22.1";
      emulator = "31.3.14";
    };

    platforms = ["23" "24" "25" "26" "27" "28" "29" "30" "31" "32" "33"];
    abis = ["armeabi-v7a" "arm64-v8a"];
    extras = ["extras;google;gcm"];
  };

  # If you copy this example out of nixpkgs, something like this will work:
  /*androidEnvNixpkgs = fetchTarball {
    name = "androidenv";
    url = "https://github.com/NixOS/nixpkgs/archive/<fill me in from Git>.tar.gz";
    sha256 = "<fill me in with nix-prefetch-url --unpack>";
  };

  androidEnv = pkgs.callPackage "${androidEnvNixpkgs}/pkgs/development/mobile/androidenv" {
    inherit config pkgs;
    licenseAccepted = true;
  };*/

  # Otherwise, just use the in-tree androidenv:
  androidEnv = pkgs.callPackage ./.. {
    inherit config pkgs;
    licenseAccepted = true;
  };

  androidComposition = androidEnv.composeAndroidPackages {
    cmdLineToolsVersion = android.versions.cmdLineToolsVersion;
    platformToolsVersion = android.versions.platformTools;
    buildToolsVersions = [android.versions.buildTools];
    platformVersions = android.platforms;
    abiVersions = android.abis;

    includeSources = true;
    includeSystemImages = true;
    includeEmulator = true;
    emulatorVersion = android.versions.emulator;

    includeNDK = true;
    ndkVersions = android.versions.ndk;
    cmakeVersions = [android.versions.cmake];

    useGoogleAPIs = true;
    includeExtras = android.extras;

    # If you want to use a custom repo JSON:
    # repoJson = ../repo.json;

    # If you want to use custom repo XMLs:
    /*repoXmls = {
      packages = [ ../xml/repository2-1.xml ];
      images = [
        ../xml/android-sys-img2-1.xml
        ../xml/android-tv-sys-img2-1.xml
        ../xml/android-wear-sys-img2-1.xml
        ../xml/android-wear-cn-sys-img2-1.xml
        ../xml/google_apis-sys-img2-1.xml
        ../xml/google_apis_playstore-sys-img2-1.xml
      ];
      addons = [ ../xml/addon2-1.xml ];
    };*/

    # Accepting more licenses declaratively:
    extraLicenses = [
      # Already accepted for you with the global accept_license = true or
      # licenseAccepted = true on androidenv.
      # "android-sdk-license"

      # These aren't, but are useful for more uncommon setups.
      "android-sdk-preview-license"
      "android-googletv-license"
      "android-sdk-arm-dbt-license"
      "google-gdk-license"
      "intel-android-extra-license"
      "intel-android-sysimage-license"
      "mips-android-sysimage-license"
    ];
  };

  androidSdk = androidComposition.androidsdk;
  platformTools = androidComposition.platform-tools;
  jdk = pkgs.jdk;
in
pkgs.mkShell rec {
  name = "androidenv-demo";
  packages = [ androidSdk platformTools jdk pkgs.android-studio ];

  LANG = "C.UTF-8";
  LC_ALL = "C.UTF-8";
  JAVA_HOME = jdk.home;

  # Note: ANDROID_HOME is deprecated. Use ANDROID_SDK_ROOT.
  ANDROID_SDK_ROOT = "${androidSdk}/libexec/android-sdk";
  ANDROID_NDK_ROOT = "${ANDROID_SDK_ROOT}/ndk-bundle";

  # Ensures that we don't have to use a FHS env by using the nix store's aapt2.
  GRADLE_OPTS = "-Dorg.gradle.project.android.aapt2FromMavenOverride=${ANDROID_SDK_ROOT}/build-tools/${android.versions.buildTools}/aapt2";

  shellHook = ''
    # Add cmake to the path.
    cmake_root="$(echo "$ANDROID_SDK_ROOT/cmake/${android.versions.cmake}"*/)"
    export PATH="$cmake_root/bin:$PATH"

    # Write out local.properties for Android Studio.
    cat <<EOF > local.properties
    # This file was automatically generated by nix-shell.
    sdk.dir=$ANDROID_SDK_ROOT
    ndk.dir=$ANDROID_NDK_ROOT
    cmake.dir=$cmake_root
    EOF
  '';

  passthru.tests = {
    sdkmanager-licenses-test = pkgs.runCommand "sdkmanager-licenses-test" {
      buildInputs = [ androidSdk jdk ];
    } ''
      if [[ ! "$(sdkmanager --licenses)" =~ "All SDK package licenses accepted." ]]; then
        echo "At least one of SDK package licenses are not accepted."
        exit 1
      fi
      touch $out
    '';

    sdkmanager-packages-test = pkgs.runCommand "sdkmanager-packages-test" {
      buildInputs = [ androidSdk jdk ];
    } ''
      output="$(sdkmanager --list)"
      installed_packages_section=$(echo "''${output%%Available Packages*}" | awk 'NR>4 {print $1}')

      packages=(
        "build-tools;30.0.3" "ndk-bundle" "platform-tools" \
        "platforms;android-23" "platforms;android-24" "platforms;android-25" "platforms;android-26" \
        "platforms;android-27" "platforms;android-28" "platforms;android-29" "platforms;android-30" \
        "platforms;android-31" "platforms;android-32" "platforms;android-33" \
        "sources;android-23" "sources;android-24" "sources;android-25" "sources;android-26" \
        "sources;android-27" "sources;android-28" "sources;android-29" "sources;android-30" \
        "sources;android-31" "sources;android-32" "sources;android-33" \
        "system-images;android-28;google_apis_playstore;arm64-v8a" \
        "system-images;android-29;google_apis_playstore;arm64-v8a" \
        "system-images;android-30;google_apis_playstore;arm64-v8a" \
        "system-images;android-31;google_apis_playstore;arm64-v8a" \
        "system-images;android-32;google_apis_playstore;arm64-v8a" \
        "system-images;android-33;google_apis_playstore;arm64-v8a"
      )

      for package in "''${packages[@]}"; do
        if [[ ! $installed_packages_section =~ "$package" ]]; then
          echo "$package package was not installed."
          exit 1
        fi
      done

      touch "$out"
    '';
  };
}