add new sftp features

Author: samu1oto

android/app/build.gradle

@@ -21,11 +21,10 @@ def keystoreProperties = new Properties()
 def keystorePropertiesFile = rootProject.file("app/key.properties")
 keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
 
-def flutterVersionCode = "42"
-//def flutterVersionCode = localProperties.getProperty("flutter.versionCode")
-//if (flutterVersionCode == null) {
-    //flutterVersionCode = "17"
-//}
+def flutterVersionCode = localProperties.getProperty("flutter.versionCode")
+if (flutterVersionCode == null) {
+    flutterVersionCode = "17"
+}
 
 def flutterVersionName = "1.0Beta4"
 //def flutterVersionName = localProperties.getProperty("flutter.versionName")

lib/help_page.dart

@@ -62,7 +62,7 @@ class HelpPage extends StatelessWidget {
                     showAboutDialog(
                       context: context,
                       applicationName: 'connecter',
-                      applicationVersion: '1.0 Beta 4',
+                      applicationVersion: '1.0 Beta 5',
                     );
                   },
                   child: const Text('关于'),

lib/services/setting_service.dart

@@ -50,13 +50,6 @@ class SettingsService {
   // 获取平台特定的默认下载路径
   static Future<String?> getPlatformDefaultDownloadPath() async {
     if (Platform.isAndroid) {
-      // Android: 优先使用 Downloads 目录
-      final downloadsDir = await getDownloadsDirectory();
-      if (downloadsDir != null) {
-        return downloadsDir.path;
-      }
-      
-      // 备用方案：外部存储目录下的 Download 文件夹
       final externalDir = await getExternalStorageDirectory();
       if (externalDir != null) {
         final downloadDir = Directory('${externalDir.path}/Download');

lib/setting_page.dart

@@ -222,7 +222,7 @@ class _SettingsPageState extends State<SettingsPage> {
                             Platform.isWindows 
                                 ? 'Windows平台不支持目录选择功能，如需自定义路径请手动输入' 
                                 : Platform.isAndroid 
-                                    ? '留空将使用 Downloads 目录' 
+                                    ? '留空将在每次下载时询问，当权限不完整则会保存到Android/data中' 
                                     : '无需修改',
                             style: const TextStyle(
                               fontSize: 12,