diff --git a/flutter/lib/common.dart b/flutter/lib/common.dart
index c6a70460d..d6be51986 100644
--- a/flutter/lib/common.dart
+++ b/flutter/lib/common.dart
@@ -233,7 +233,7 @@ class AccessibilityListener extends StatelessWidget {
           }
         },
         onPointerUp: (evt) {
-          if (evt.size == 1 && GestureBinding.instance != null) {
+          if (evt.size == 1) {
             GestureBinding.instance.handlePointerEvent(PointerUpEvent(
                 pointer: evt.pointer + offset,
                 size: 0.1,
@@ -243,7 +243,7 @@ class AccessibilityListener extends StatelessWidget {
           }
         },
         onPointerMove: (evt) {
-          if (evt.size == 1 && GestureBinding.instance != null) {
+          if (evt.size == 1) {
             GestureBinding.instance.handlePointerEvent(PointerMoveEvent(
                 pointer: evt.pointer + offset,
                 size: 0.1,
diff --git a/flutter/lib/models/file_model.dart b/flutter/lib/models/file_model.dart
index 49184cf5b..e4afc892f 100644
--- a/flutter/lib/models/file_model.dart
+++ b/flutter/lib/models/file_model.dart
@@ -593,15 +593,7 @@ class FileFetcher {
 
   tryCompleteTask(String? msg, String? isLocalStr) {
     if (msg == null || isLocalStr == null) return;
-    late final isLocal;
     late final tasks;
-    if (isLocalStr == "true") {
-      isLocal = true;
-    } else if (isLocalStr == "false") {
-      isLocal = false;
-    } else {
-      return;
-    }
     try {
       final fd = FileDirectory.fromJson(jsonDecode(msg));
       if (fd.id > 0) {
diff --git a/flutter/lib/models/native_model.dart b/flutter/lib/models/native_model.dart
index f6824dda8..a600e372e 100644
--- a/flutter/lib/models/native_model.dart
+++ b/flutter/lib/models/native_model.dart
@@ -21,7 +21,6 @@ typedef F2 = Pointer<Utf8> Function(Pointer<Utf8>, Pointer<Utf8>);
 typedef F3 = void Function(Pointer<Utf8>, Pointer<Utf8>);
 
 class PlatformFFI {
-  static Pointer<RgbaFrame>? _lastRgbaFrame;
   static String _dir = '';
   static String _homeDir = '';
   static F2? _getByName;
diff --git a/flutter/lib/models/web_model.dart b/flutter/lib/models/web_model.dart
index d9668272a..3ec6c9b9f 100644
--- a/flutter/lib/models/web_model.dart
+++ b/flutter/lib/models/web_model.dart
@@ -1,3 +1,5 @@
+// ignore_for_file: avoid_web_libraries_in_flutter
+
 import 'dart:convert';
 import 'dart:typed_data';
 import 'dart:js';
diff --git a/flutter/lib/pages/connection_page.dart b/flutter/lib/pages/connection_page.dart
index 2cfbaa63b..90f290136 100644
--- a/flutter/lib/pages/connection_page.dart
+++ b/flutter/lib/pages/connection_page.dart
@@ -100,8 +100,8 @@ class _ConnectionPageState extends State<ConnectionPage> {
         : InkWell(
             onTap: () async {
               final url = _updateUrl + '.apk';
-              if (await canLaunch(url)) {
-                await launch(url);
+              if (await canLaunchUrl(Uri.parse(url))) {
+                await launchUrl(Uri.parse(url));
               }
             },
             child: Container(
diff --git a/flutter/lib/pages/remote_page.dart b/flutter/lib/pages/remote_page.dart
index 9feef9577..b93069203 100644
--- a/flutter/lib/pages/remote_page.dart
+++ b/flutter/lib/pages/remote_page.dart
@@ -126,7 +126,7 @@ class _RemotePageState extends State<RemotePage> {
           common < oldValue.length &&
               common < newValue.length &&
               newValue[common] == oldValue[common];
-          ++common);
+          ++common) {}
       for (i = 0; i < oldValue.length - common; ++i) {
         FFI.inputKey('VK_BACK');
       }
diff --git a/flutter/lib/pages/settings_page.dart b/flutter/lib/pages/settings_page.dart
index 90ff0d564..2c8b7fe9a 100644
--- a/flutter/lib/pages/settings_page.dart
+++ b/flutter/lib/pages/settings_page.dart
@@ -68,8 +68,8 @@ class _SettingsState extends State<SettingsPage> {
           tiles: [
             SettingsTile.navigation(
                 onPressed: (context) async {
-                  if (await canLaunch(url)) {
-                    await launch(url);
+                  if (await canLaunchUrl(Uri.parse(url))) {
+                    await launchUrl(Uri.parse(url));
                   }
                 },
                 title: Text(translate("Version: ") + version),
@@ -105,8 +105,8 @@ void showAbout() {
         InkWell(
             onTap: () async {
               const url = 'https://rustdesk.com/';
-              if (await canLaunch(url)) {
-                await launch(url);
+              if (await canLaunchUrl(Uri.parse(url))) {
+                await launchUrl(Uri.parse(url));
               }
             },
             child: Padding(
@@ -149,7 +149,7 @@ fetch('http://localhost:21114/api/login', {
     'uuid': FFI.getByName('uuid')
   };
   try {
-    final response = await http.post(Uri.parse('${url}/api/login'),
+    final response = await http.post(Uri.parse('$url/api/login'),
         headers: {"Content-Type": "application/json"}, body: json.encode(body));
     return parseResp(response.body);
   } catch (e) {
@@ -186,7 +186,7 @@ void refreshCurrentUser() async {
     'uuid': FFI.getByName('uuid')
   };
   try {
-    final response = await http.post(Uri.parse('${url}/api/currentUser'),
+    final response = await http.post(Uri.parse('$url/api/currentUser'),
         headers: {
           "Content-Type": "application/json",
           "Authorization": "Bearer $token"
@@ -212,7 +212,7 @@ void logout() async {
     'uuid': FFI.getByName('uuid')
   };
   try {
-    await http.post(Uri.parse('${url}/api/logout'),
+    await http.post(Uri.parse('$url/api/logout'),
         headers: {
           "Content-Type": "application/json",
           "Authorization": "Bearer $token"
@@ -242,7 +242,7 @@ String getUrl() {
           url = 'http://${tmp[0]}:$port';
         }
       } else {
-        url = 'http://${url}:21114';
+        url = 'http://$url:21114';
       }
     }
   }
diff --git a/flutter/lib/widgets/gestures.dart b/flutter/lib/widgets/gestures.dart
index d70fe05e6..960439678 100644
--- a/flutter/lib/widgets/gestures.dart
+++ b/flutter/lib/widgets/gestures.dart
@@ -594,10 +594,7 @@ class _TapTracker {
     required this.entry,
     required Duration doubleTapMinTime,
     required this.gestureSettings,
-  })  : assert(doubleTapMinTime != null),
-        assert(event != null),
-        assert(event.buttons != null),
-        pointer = event.pointer,
+  })  : pointer = event.pointer,
         _initialGlobalPosition = event.position,
         initialButtons = event.buttons,
         _doubleTapMinTimeCountdown =
@@ -643,7 +640,7 @@ class _TapTracker {
 /// CountdownZoned tracks whether the specified duration has elapsed since
 /// creation, honoring [Zone].
 class _CountdownZoned {
-  _CountdownZoned({required Duration duration}) : assert(duration != null) {
+  _CountdownZoned({required Duration duration}) {
     Timer(duration, _onTimeout);
   }