处理获取不到权限的时候没有走私有文件夹的

lib/app_upgrade_plugin_method_channel.dart

@@ -282,7 +282,7 @@ class MethodChannelAppUpgradePlugin extends AppUpgradePluginPlatform {
         debugPrint('错误: 无法获取下载路径');
         throw Exception('无法获取下载路径');
       }
-      debugPrint('下载路径: $savePath');
+      debugPrint('--------------------------------------------------------------------下载路径: $savePath');
 
       // 下载前清理历史APK文件
       await _clearHistoryApkFiles(savePath);
@@ -571,8 +571,20 @@ class MethodChannelAppUpgradePlugin extends AppUpgradePluginPlatform {
       // 检查存储权限状态
       final sdkVersion = await _getAndroidSdkVersion();
 
+      if (sdkVersion >= 30) {
+        final manageStatus = await Permission.manageExternalStorage.status;
+        if (!manageStatus.isGranted) {
+          debugPrint('MANAGE_EXTERNAL_STORAGE 未授予，使用应用私有目录');
+          return await _getAppPrivateDownloadPath();
+        }
+      } else if (sdkVersion >= 29) {
+        final storageStatus = await Permission.storage.status;
+        if (!storageStatus.isGranted) {
+          debugPrint('Android 10 存储权限未授予，使用应用私有目录');
+          return await _getAppPrivateDownloadPath();
+        }
+      } else {
         // Android 9 及以下需要 WRITE_EXTERNAL_STORAGE 权限来写入公共目录
-      if (sdkVersion <= 28) {
         final permission = await Permission.storage.status;
         if (!permission.isGranted) {
           debugPrint('存储权限未授予，使用应用私有目录');

lib/core/permission_helper.dart

@@ -50,6 +50,7 @@ class PermissionHelper {
       if (context.mounted) {
         final proceed = await _showRationaleDialog(
           context,
+          cancelText: "拒绝",
           title: '需要文件管理权限',
           content: '为了下载更新文件到您选择的位置，我们需要访问设备存储。您也可以选择"拒绝"，应用将使用私有存储空间。',
         );
@@ -300,6 +301,7 @@ class PermissionHelper {
     BuildContext context, {
     required String title,
     required String content,
+    String? cancelText,
   }) async {
     final result = await showDialog<bool>(
       context: context,
@@ -309,7 +311,7 @@ class PermissionHelper {
         actions: [
           TextButton(
             onPressed: () => Navigator.of(context).pop(false),
-            child: const Text('取消'),
+            child: Text(cancelText ?? '取消'),
           ),
           TextButton(
             onPressed: () => Navigator.of(context).pop(true),