flake-template-hell/templates/android/flake.nix

{
  description = "My Android project";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    devshell.url = "github:numtide/devshell";
    flake-parts.url = "github:hercules-ci/flake-parts";
    android.url = "github:tadfisher/android-nixpkgs";
  };

  outputs = inputs @ {
    self,
    nixpkgs,
    ...
  }:
    inputs.flake-parts.lib.mkFlake {inherit inputs;} {
      systems = ["x86_64-linux"];
      imports = [
        inputs.devshell.flakeModule
      ];
      flake = {
        overlays.default = final: prev: {
          android-sdk = inputs.android.sdk.${final.system} (sdkPkgs:
            builtins.attrValues {
              inherit
                (sdkPkgs)
                build-tools-34-0-0
                cmdline-tools-latest
                emulator
                platform-tools
                platforms-android-34
                ;
            });
          android-studio = prev.androidStudioPackages.stable;
        };
      };
      perSystem = {
        pkgs,
        system,
        self',
        ...
      }: {
        _module.args.pkgs = import nixpkgs {
          config.allowUnfree = true;
          inherit system;
          overlays = [
            inputs.devshell.overlays.default
            self.overlays.default
          ];
        };
        packages = {inherit (pkgs) android-studio android-sdk;};
        devshells.default = {
          env = [
            {
              name = "ANDROID_HOME";
              value = "${self'.packages.android-sdk}/share/android-sdk";
            }
            {
              name = "ANDROID_SDK_ROOT";
              value = "${self'.packages.android-sdk}/share/android-sdk";
            }
            {
              name = "JAVA_HOME";
              value = pkgs.jdk.home;
            }
          ];
          packages = builtins.attrValues {
            inherit
              (pkgs)
              android-sdk
              gradle
              jdk
              android-studio
              ;
          };
        };
      };
    };
}