Add AssetManager.withNDK()

Author: colemancda

Package.swift

@@ -297,6 +297,8 @@ var package = Package(
                 "AndroidJava",
                 "AndroidUtil",
                 "AndroidOS",
+                "AndroidNDK",
+                "AndroidFileManager",
             ],
             exclude: ["swift-java.config"],
             swiftSettings: [

Sources/AndroidContent/AssetManagerNDK.swift

@@ -0,0 +1,55 @@
+//
+//  AssetManagerNDK.swift
+//  SwiftAndroid
+//
+//  Created by Alsey Coleman Miller on 2/27/26.
+//
+
+#if canImport(Android)
+import Android
+import AndroidNDK
+#endif
+import SwiftJava
+import CSwiftJavaJNI
+import AndroidFileManager
+
+// MARK: - NDK Asset Manager
+
+public extension AssetManager {
+
+    /// Equivalent NDK type.
+    typealias NDK = AndroidFileManager.AssetManager
+
+    /// Create a temporary NDK object and perform operations on it.
+    func withNDK<E, Result>(_ body: (borrowing NDK) throws(E) -> Result) throws(E) -> Result where E: Error {
+        let ndk = NDK.fromJava(javaThis, environment: javaEnvironment)
+        return try body(ndk)
+    }
+}
+
+internal extension AndroidFileManager.AssetManager {
+
+    /**
+     * Converts an android.content.res.AssetManager object into an AAssetManager* object.
+     *
+     * If the asset manager is null, null is returned.
+     *
+     * Available since API level 24.
+     *
+     * \param env Java environment. Must not be null.
+     * \param assetManager android.content.res.AssetManager java object.
+     *
+     * \return an AAssetManager object representing the Java AssetManager object. If either parameter
+     * is null, this will return null.
+     */
+    static func fromJava(_ javaObject: jobject, environment: JNIEnvironment) -> AndroidFileManager.AssetManager {
+        guard let pointer = AAssetManager_fromJava(environment, javaObject) else {
+            fatalError("Unable to initialize from Java object")
+        }
+        return AndroidFileManager.AssetManager(pointer)
+    }
+}
+
+#if !os(Android)
+func AAssetManager_fromJava(_ environment: JNIEnvironment?, _ javaObject: jobject) -> OpaquePointer? { fatalError("stub") }
+#endif