feat: simplify method channel setup in isolate

app/lib/config/init.dart

@@ -37,7 +37,6 @@ import 'package:localsend_app/rust/frb_generated.dart';
 import 'package:localsend_app/util/i18n.dart';
 import 'package:localsend_app/util/native/autostart_helper.dart';
 import 'package:localsend_app/util/native/cache_helper.dart';
-import 'package:localsend_app/util/native/content_uri_helper.dart';
 import 'package:localsend_app/util/native/context_menu_helper.dart';
 import 'package:localsend_app/util/native/cross_file_converters.dart';
 import 'package:localsend_app/util/native/device_info_helper.dart';
@@ -188,13 +187,7 @@ Future<RefenaContainer> preInit(List<String> args) async {
     }),
   );
 
-  await container
-      .redux(parentIsolateProvider)
-      .dispatchAsync(
-        IsolateSetupAction(
-          uriContentStreamResolver: AndroidUriContentStreamResolver(),
-        ),
-      );
+  await container.redux(parentIsolateProvider).dispatchAsync(IsolateSetupAction());
 
   return container;
 }

app/lib/isolate/isolate.dart

@@ -14,8 +14,7 @@ export 'package:localsend_app/isolate/src/isolate/child/upload_isolate.dart'
         HttpUploadFileFailedEvent,
         HttpUploadFileFinishedEvent,
         HttpUploadFileProgressEvent,
-        HttpUploadFileStartedEvent,
-        UriContentStreamResolver;
+        HttpUploadFileStartedEvent;
 export 'package:localsend_app/isolate/src/isolate/parent/actions.dart';
 export 'package:localsend_app/isolate/src/isolate/parent/actions_sync.dart';
 export 'package:localsend_app/isolate/src/isolate/parent/parent_isolate_provider.dart';

app/lib/isolate/src/isolate/child/upload_isolate.dart

@@ -1,5 +1,4 @@
-import 'dart:typed_data';
-
+import 'package:flutter/services.dart';
 import 'package:localsend_app/isolate/isolate.dart';
 import 'package:localsend_app/isolate/model/device.dart';
 import 'package:localsend_app/isolate/src/isolate/child/main.dart';
@@ -13,14 +12,6 @@ import 'package:typed_isolates/typed_isolates.dart';
 
 sealed class BaseHttpUploadTask {}
 
-class HttpUploadSetContentStreamResolverTask implements BaseHttpUploadTask {
-  final UriContentStreamResolver resolver;
-
-  HttpUploadSetContentStreamResolverTask({
-    required this.resolver,
-  });
-}
-
 class HttpUploadFile {
   final String remoteFileToken;
   final String fileId;
@@ -102,15 +93,6 @@ class HttpUploadFileFailedEvent extends HttpUploadEvent {
 /// Task ID -> CancelToken
 final _cancelTokenProvider = Provider((ref) => <int, RsCancellationToken>{});
 
-abstract class UriContentStreamResolver {
-  /// Separate initialization method to create instance in the child isolate.
-  /// Cannot reference the RootIsolateToken class because it is not part of Dart.
-  void init({required Object? rootIsolateToken});
-
-  /// Resolves the content stream for the given URI.
-  Stream<Uint8List> resolve(Uri uri);
-}
-
 Future<void> setupHttpUploadIsolate(
   Stream<SendToIsolateData<IsolateTask<BaseHttpUploadTask>>> receiveFromMain,
   void Function(IsolateTaskStreamResult<HttpUploadEvent>) sendToMain,
@@ -121,15 +103,16 @@ Future<void> setupHttpUploadIsolate(
     receiveFromMain: receiveFromMain,
     sendToMain: sendToMain,
     initialData: initialData,
+    init: (ref) async {
+      // Initialize the platform method channel so getFileDescriptorAndroid
+      // (used to resolve "content://" files) works inside this isolate.
+      BackgroundIsolateBinaryMessenger.ensureInitialized(
+        ref.read(syncProvider).rootIsolateToken as RootIsolateToken,
+      );
+    },
     handler: (ref, task) async {
       final HttpUploadFilesTask uploadTask;
       switch (task.data) {
-        case HttpUploadSetContentStreamResolverTask task:
-          final rootIsolateToken = ref.read(syncProvider).rootIsolateToken;
-          task.resolver.init(
-            rootIsolateToken: rootIsolateToken,
-          );
-          return;
         case HttpUploadFilesTask task:
           uploadTask = task;
           break;

app/lib/isolate/src/isolate/parent/parent_isolate_provider.dart

@@ -64,13 +64,6 @@ class IsolateController extends ReduxNotifier<ParentIsolateState> {
 /// Starts the required isolates.
 /// Should be called by the main isolate.
 class IsolateSetupAction extends AsyncReduxAction<IsolateController, ParentIsolateState> {
-  /// If provided, file paths starting with "content://" will be resolved using this resolver.
-  final UriContentStreamResolver? uriContentStreamResolver;
-
-  IsolateSetupAction({
-    required this.uriContentStreamResolver,
-  });
-
   @override
   Future<ParentIsolateState> reduce() async {
     final httpScanDiscovery =
@@ -108,18 +101,6 @@ class IsolateSetupAction extends AsyncReduxAction<IsolateController, ParentIsola
           ),
         );
 
-    if (uriContentStreamResolver != null) {
-      httpUpload.sendToIsolate(
-        SendToIsolateData(
-          syncState: null,
-          data: IsolateTask(
-            id: -1,
-            data: HttpUploadSetContentStreamResolverTask(resolver: uriContentStreamResolver!),
-          ),
-        ),
-      );
-    }
-
     return state.copyWith(
       httpScanDiscovery: httpScanDiscovery,
       multicastDiscovery: multicastDiscovery,

app/lib/util/native/content_uri_helper.dart

@@ -1,7 +1,3 @@
-import 'package:flutter/services.dart';
-import 'package:localsend_app/isolate/isolate.dart';
-import 'package:uri_content/uri_content.dart';
-
 class ContentUriHelper {
   /// Converts
   /// content://com.android.externalstorage.documents/tree/primary%3ADocuments
@@ -88,18 +84,3 @@ class ContentUriHelper {
     return uri.substring(0, treeIndex + 6) + encodedPath;
   }
 }
-
-class AndroidUriContentStreamResolver implements UriContentStreamResolver {
-  UriContent? _uriContent;
-
-  @override
-  void init({required Object? rootIsolateToken}) {
-    BackgroundIsolateBinaryMessenger.ensureInitialized(rootIsolateToken as RootIsolateToken);
-    _uriContent = UriContent();
-  }
-
-  @override
-  Stream<Uint8List> resolve(Uri uri) {
-    return _uriContent!.getContentStream(uri);
-  }
-}