creating android project files

flake.nix

@@ -9,7 +9,13 @@
   outputs = { self, nixpkgs, utils }:
     utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        pkgs = import nixpkgs {
+          inherit system;
+          config = {
+            allowUnfree = true;
+            android_sdk.accept_license = true;
+          };
+        };
 
         rmlui = pkgs.stdenv.mkDerivation rec {
           pname = "rmlui";
@@ -66,10 +72,31 @@
           sqlitecpp
           toml11
         ];
+
+        ndkVersion = "26.3.11579264";
+
+        androidComposition = pkgs.androidenv.composeAndroidPackages {
+          platformVersions = [ "34" ];
+          buildToolsVersions = [ "34.0.0" ];
+          includeNDK = true;
+          ndkVersions = [ ndkVersion ];
+          abiVersions = [ "arm64-v8a" ];
+          includeEmulator = false;
+        };
+
+        androidSdkRoot = "${androidComposition.androidsdk}/libexec/android-sdk";
+        androidNdkRoot = "${androidSdkRoot}/ndk/${ndkVersion}";
+
+        androidDeps = [
+          androidComposition.androidsdk
+          pkgs.gradle
+          pkgs.jdk17
+          pkgs.ninja
+        ];
       in
       {
         devShells.default = pkgs.mkShell {
-          nativeBuildInputs = buildDeps;
+          nativeBuildInputs = buildDeps ++ androidDeps;
           buildInputs = runtimeDeps;
 
           shellHook = ''
@@ -77,7 +104,12 @@
             export LIBRARY_PATH="${pkgs.libGL}/lib:${rmlui}/lib"
             export LD_LIBRARY_PATH="$LIBRARY_PATH:$LD_LIBRARY_PATH"
 
-            echo "Env ready"
+            export ANDROID_HOME="${androidSdkRoot}"
+            export ANDROID_SDK_ROOT="${androidSdkRoot}"
+            export ANDROID_NDK_HOME="${androidNdkRoot}"
+            export ANDROID_NDK_ROOT="${androidNdkRoot}"
+
+            echo "Env ready (desktop + Android NDK ${ndkVersion}, arm64-v8a)"
           '';
         };