Fix gradle aapt2 linking

flake.nix

@@ -43,30 +43,37 @@
         sdkRoot = "${androidSdk}/libexec/android-sdk";
 
         fonts = with pkgs; [ noto-fonts dejavu_fonts freefont_ttf ];
+
+        # NixOS gotcha: AGP downloads a dynamically-linked aapt2 from Maven
+        # that can't run on NixOS. android.aapt2FromMavenOverride is a Gradle
+        # *project* property; `-Dorg.gradle.project.<name>` on the command line
+        # sets one. It must be a CLI arg, not GRADLE_OPTS: the gradle package
+        # in nixpkgs 25.11 is a raw `exec java ... GradleMain "$@"` wrapper
+        # that ignores GRADLE_OPTS (fixed post-25.11 in nixpkgs PR #449037 —
+        # once we're past 25.11, plain GRADLE_OPTS works and this wrapper can go).
+        gradle = pkgs.symlinkJoin {
+          name = "gradle-nixos-aapt2";
+          paths = [ pkgs.gradle ];
+          nativeBuildInputs = [ pkgs.makeWrapper ];
+          postBuild = ''
+            wrapProgram $out/bin/gradle \
+              --add-flags "-Dorg.gradle.project.android.aapt2FromMavenOverride=${sdkRoot}/build-tools/${buildToolsVersion}/aapt2"
+          '';
+        };
       in
       {
         devShells.default = pkgs.mkShell {
           packages = [
             androidSdk
             pkgs.jdk17
-            pkgs.gradle
+            gradle # wrapped, see above
             pkgs.imagemagick # banner/icon generation
             pkgs.android-tools # adb for sideloading
           ] ++ fonts;
 
-
           ANDROID_HOME = sdkRoot;
           ANDROID_SDK_ROOT = sdkRoot;
           FONTCONFIG_FILE = pkgs.makeFontsConf { fontDirectories = fonts; };
-
-          # NixOS gotcha: AGP downloads a dynamically-linked aapt2 from Maven
-          # that can't run on NixOS. AGP reads the override from gradle.properties
-          # as a project property (not a JVM system property), so GRADLE_OPTS -D
-          # flags don't work. The shellHook writes the correct nix store path
-          # directly into gradle.properties so providers.gradleProperty() finds it.
-          shellHook = ''
-            sed -i "s|android.aapt2FromMavenOverride=.*|android.aapt2FromMavenOverride=${sdkRoot}/build-tools/${buildToolsVersion}/aapt2|" gradle.properties
-          '';
         };
       }
     );