- Added namespace

android/build.gradle

@@ -28,12 +28,27 @@ apply plugin: 'kotlin-android'
 android {
     compileSdkVersion 33
 
+    if (project.android.hasProperty('namespace')) {
+        namespace 'io.alexrintt.sharedstorage'
+    }
+
+
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }
     defaultConfig {
         minSdkVersion 19
     }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_18
+        targetCompatibility JavaVersion.VERSION_18
+    }
+
+    kotlinOptions {
+        jvmTarget = "18" // Explicitly match Java's version
+    }
+
 }
 
 dependencies {

android/gradle.properties

@@ -1,3 +1,4 @@
 org.gradle.jvmargs=-Xmx1536M
 android.useAndroidX=true
 android.enableJetifier=true
+kotlin.jvm.target.validation.mode = IGNORE

android/src/main/kotlin/io/alexrintt/sharedstorage/deprecated/DocumentFileApi.kt

@@ -289,10 +289,23 @@ internal class DocumentFileApi(private val plugin: SharedStoragePlugin) :
           result.notSupported(CHILD, API_21, mapOf("uri" to uri))
         }
       }
+      CAN_OPEN_DOCUMENT_TREE -> {
+        result.success(canOpenDocumentTree())
+      }
       else -> result.notImplemented()
     }
   }
 
+  private fun canOpenDocumentTree(): Boolean {
+    return try {
+      val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+      val activities = plugin.context.packageManager.queryIntentActivities(intent, 0)
+      activities.isNotEmpty()
+    } catch (e: Exception) {
+      false
+    }
+  }
+
   @RequiresApi(API_21)
   private fun openDocument(call: MethodCall, result: MethodChannel.Result) {
     val initialUri = call.argument<String>("initialUri")

android/src/main/kotlin/io/alexrintt/sharedstorage/deprecated/lib/StorageAccessFrameworkConstant.kt

@@ -39,6 +39,7 @@ const val COPY = "copy"
 const val LAST_MODIFIED = "lastModified"
 const val GET_DOCUMENT_THUMBNAIL = "getDocumentThumbnail"
 const val CHILD = "child"
+const val CAN_OPEN_DOCUMENT_TREE = "canOpenDocumentTree"
 
 /**
  * Available DocumentFileHelper Method Channel APIs

lib/src/common/functional_extender.dart

@@ -25,7 +25,13 @@ extension FunctionalExtender<T> on T? {
   T? takeIf(bool Function(T) f) {
     final T? self = this;
 
-    return self != null && f(self) ? self : null;
+    if (self == null) return null;
+
+    if (f(self)) {
+      return self;
+    } else {
+      return null;
+    }
   }
 }
 

lib/src/saf/saf.dart

@@ -134,6 +134,18 @@ Future<bool?> canRead(Uri uri) async => kDocumentFileChannel
 Future<bool?> canWrite(Uri uri) async => kDocumentFileChannel
     .invokeMethod<bool>('canWrite', <String, String>{'uri': '$uri'});
 
+/// {@template sharedstorage.saf.canOpenDocumentTree}
+/// Check if the device supports Storage Access Framework (SAF) and can open document trees.
+///
+/// Returns `true` if the device has apps that can handle ACTION_OPEN_DOCUMENT_TREE intents,
+/// `false` otherwise. This is useful to determine SAF support before attempting to use
+/// document tree operations.
+///
+/// [Refer to details](https://developer.android.com/reference/android/content/Intent#ACTION_OPEN_DOCUMENT_TREE).
+/// {@endtemplate}
+Future<bool?> canOpenDocumentTree() async => kDocumentFileChannel
+    .invokeMethod<bool>('canOpenDocumentTree');
+
 /// {@template sharedstorage.saf.getDocumentThumbnail}
 /// Equivalent to `DocumentsContract.getDocumentThumbnail`.
 ///