Add flake.nix

flake.nix

@@ -0,0 +1,46 @@
+{
+  description = "SpMp development environment";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    android-nixpkgs = {
+      url = "github:HPRIOR/android-nixpkgs/516bd59caa6883d1a5dad0538af03a1f521e7764";
+      #follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, android-nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+    in
+    {
+      devShells."${system}".default =
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+          };
+
+          android-sdk = (android-nixpkgs.sdk.${system} (sdkPkgs: with sdkPkgs; [
+            cmdline-tools-latest
+            build-tools-34-0-0
+            platform-tools
+            platforms-android-34
+          ]));
+        in
+        pkgs.mkShell {
+          packages = with pkgs; [
+            jdk17
+            android-sdk
+
+            # Runtime
+            libglvnd
+            xorg.libX11
+            fontconfig
+          ];
+
+          JAVA_HOME = "${pkgs.jdk17}/lib/openjdk";
+
+          GRADLE_OPTS = "-Dorg.gradle.project.android.aapt2FromMavenOverride=${android-sdk}/share/android-sdk/build-tools/34.0.0/aapt2";
+        };
+    };
+}