Add Nix flake

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,7 +1,6 @@
-local/
+.direnv/
 
 pubspec.lock
-Gemfile.lock
 
 # Miscellaneous
 *.class

flake.nix

@@ -0,0 +1,53 @@
+{
+  inputs = {
+    nixpkgs.url =
+      "github:nixos/nixpkgs?ref=a22a985f13d58b2bafb4964dd2bdf6376106a2d2";
+    # https://github.com/NixOS/nixpkgs/pull/311815
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          config = {
+            android_sdk.accept_license = true;
+            allowUnfree = true;
+          };
+        };
+
+        flutter = pkgs.flutterPackages.v3_22;
+
+        # Android
+        androidSdkArgs = {
+          buildToolsVersions = [ "30.0.3" ];
+          platformVersions = [ "34" ];
+        };
+        androidComposition =
+          pkgs.androidenv.composeAndroidPackages androidSdkArgs;
+        androidSdk = androidComposition.androidsdk;
+        androidEmulator = pkgs.androidenv.emulateApp {
+          name = "Emulator";
+          platformVersion = "34";
+          systemImageType = "google_apis_playstore";
+          abiVersion = "x86_64";
+          configOptions = {
+            # https://android.googlesource.com/platform/external/qemu/+/refs/heads/master/android/avd/hardware-properties.ini
+            "hw.ramSize" = "4096";
+            "hw.lcd.width" = "1170";
+            "hw.lcd.height" = "2532";
+            "hw.lcd.density" = "460";
+            "hw.keyboard" = "yes";
+          };
+          sdkExtraArgs = androidSdkArgs;
+        };
+      in {
+        devShell = with pkgs;
+          mkShell {
+            ANDROID_SDK_ROOT = "${androidSdk}/libexec/android-sdk";
+            FLUTTER_ROOT = flutter;
+            buildInputs = [ androidEmulator androidSdk flutter ];
+          };
+      });
+}