initial flutter android build

android/app/build.gradle

@@ -39,6 +39,11 @@ android {
         targetCompatibility = JavaVersion.VERSION_17
     }
 
+    kotlinOptions {
+        // do we want to update.. eventually?
+        jvmTarget = "17"
+    }
+
     defaultConfig {
         applicationId = "nexus.federated.Nexus"
         minSdk = 29
@@ -50,7 +55,8 @@ android {
 	signingConfigs {
 		release {
 			keyAlias "key"
-			storeFile keystoreProperties['path'] ? file(keystoreProperties['path']) : file(System.getenv("KEYSTORE_PATH"))
+			def storePath = keystoreProperties['path'] ?: System.getenv("KEYSTORE_PATH")
+			storeFile storePath ? file(storePath) : null
 			keyPassword keystoreProperties['password'] ?: System.getenv("KEYSTORE_PASSWORD")
 			storePassword keystoreProperties['password'] ?: System.getenv("KEYSTORE_PASSWORD")
 		}

android/app/src/main/AndroidManifest.xml

@@ -10,7 +10,7 @@
         android:label="Nexus"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher"
-        android:roundIcon="@mipmap/nexus_round"
+        android:roundIcon="@mipmap/ic_launcher"
 		android:allowBackup="false"
     	android:fullBackupContent="false">
         <activity

flake.nix

@@ -33,7 +33,6 @@
           _module.args.pkgs = import nixpkgs {
             inherit system;
             config = {
-              permittedInsecurePackages = [ "olm-3.2.16" ];
               android_sdk.accept_license = true;
               allowUnfree = true;
             };
@@ -43,7 +42,6 @@
             let
               packages = with pkgs; [
                 go
-                olm
                 git
               ];
 

hook/build.dart

@@ -6,8 +6,12 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
   final buildDir = input.packageRoot.resolve("src/");
   if (await File(buildDir.resolve("lock").toFilePath()).exists()) return;
 
-  final targetOS = input.config.code.targetOS;
+  final codeConfig = input.config.code;
+  final targetOS = codeConfig.targetOS;
+  final targetArch = codeConfig.targetArchitecture;
+
   String libFileName;
+  Map<String, String> env = {};
   switch (targetOS) {
     case OS.linux:
       libFileName = "libgomuks.so";
@@ -18,20 +22,51 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
     case OS.windows:
       libFileName = "libgomuks.dll";
       break;
+    case OS.android:
+      libFileName = "libgomuks.so";
+
+      final targetNdkApi = codeConfig.android.targetNdkApi;
+
+      final ndkHome = Platform.environment["ANDROID_NDK_HOME"]
+          ?? Platform.environment["ANDROID_NDK_ROOT"]
+          ?? Platform.environment["NDK_HOME"]
+          ?? await _findNdkFromSdk();
+      if (ndkHome == null) {
+        throw Exception(
+          "Could not find Android NDK. Set ANDROID_NDK_HOME or install via sdkmanager.",
+        );
+      }
+
+      final hostTag = _ndkHostTag();
+      final (goArch, ccTriple) = _androidArch(targetArch);
+      final cc = "$ndkHome/toolchains/llvm/prebuilt/$hostTag/bin/$ccTriple$targetNdkApi-clang";
+
+      env = {
+        "CGO_ENABLED": "1",
+        "GOOS": "android",
+        "GOARCH": goArch,
+        "CC": cc,
+      };
+      break;
     default:
       throw UnsupportedError("Unsupported OS: $targetOS");
   }
 
   final gomuksBuildDir = buildDir.resolve("gomuks/");
-  final libFile = gomuksBuildDir.resolve(libFileName);
+  final libFile = gomuksBuildDir.resolve("${targetArch.name}/$libFileName");
 
-  print("Building Gomuks shared library $libFileName from source...");
+  // goheif/dav1d supported on Android would need to fix upstream
+  final tags = targetOS == OS.android ? "goolm,noheic" : "goolm";
+
+  print("Building Gomuks shared library $libFileName (${targetOS.name}/${targetArch.name}) from source...");
   final result = await Process.run("go", [
     "build",
+    "-tags", tags,
     "-o",
     libFile.path,
     "-buildmode=c-shared",
-  ], workingDirectory: gomuksBuildDir.resolve("source/pkg/ffi/").toFilePath());
+  ], workingDirectory: gomuksBuildDir.resolve("source/pkg/ffi/").toFilePath(),
+     environment: env.isNotEmpty ? env : null);
 
   if (result.exitCode != 0) {
     throw Exception("Failed to build Gomuks shared library\n${result.stderr}");
@@ -52,3 +87,42 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
     ..dependencies.add(gomuksBuildDir);
   print("Done!");
 });
+
+Future<String?> _findNdkFromSdk() async {
+  // pretty sure this wont be needed with nix, i'll get this removed
+  final androidHome = Platform.environment["ANDROID_HOME"]
+      ?? Platform.environment["ANDROID_SDK_ROOT"];
+  if (androidHome == null) return null;
+  final ndkDir = Directory("$androidHome/ndk");
+  if (!await ndkDir.exists()) return null;
+  final versions = await ndkDir.list().toList();
+  if (versions.isEmpty) return null;
+  versions.sort((a, b) => a.path.compareTo(b.path));
+  return versions.last.path;
+}
+
+String _ndkHostTag() {
+  if (Platform.isMacOS) {
+    return "darwin-x86_64";
+  } else if (Platform.isLinux) {
+    return "linux-x86_64";
+  } else if (Platform.isWindows) {
+    return "windows-x86_64";
+  }
+  throw UnsupportedError("Unsupported host platform for Android NDK");
+}
+
+(String goArch, String ccTriple) _androidArch(Architecture arch) {
+  switch (arch) {
+    case Architecture.arm64:
+      return ("arm64", "aarch64-linux-android");
+    case Architecture.arm:
+      return ("arm", "armv7a-linux-androideabi");
+    case Architecture.x64:
+      return ("amd64", "x86_64-linux-android");
+    case Architecture.ia32:
+      return ("386", "i686-linux-android");
+    default:
+      throw UnsupportedError("Unsupported Android architecture: $arch");
+  }
+}

lib/main.dart

@@ -59,15 +59,17 @@ void showError(Object error, [StackTrace? stackTrace]) {
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
-  await windowManager.ensureInitialized();
-  await windowManager.waitUntilReadyToShow(
-    WindowOptions(titleBarStyle: TitleBarStyle.hidden),
-  );
+  if (Platform.isLinux || Platform.isMacOS || Platform.isWindows) {
+    await windowManager.ensureInitialized();
+    await windowManager.waitUntilReadyToShow(
+      WindowOptions(titleBarStyle: TitleBarStyle.hidden),
+    );
 
-  if (Platform.isLinux) {
-    setWindowMinSize(const Size.square(500));
-  } else {
-    await windowManager.setMinimumSize(Size.square(500));
+    if (Platform.isLinux) {
+      setWindowMinSize(const Size.square(500));
+    } else {
+      await windowManager.setMinimumSize(Size.square(500));
+    }
   }
 
   FlutterError.onError = (FlutterErrorDetails details) =>