feat: 更新 WebView 数据目录后缀至 v4；添加清除 WebView HTTP 缓存的方法

android/app/src/main/kotlin/io/openim/flutter/openim/MainActivity.kt

@@ -31,10 +31,10 @@ class MainActivity : FlutterActivity() {
     private val WEBVIEW_CACHE_CHANNEL = "io.openim.flutter.im_webview_app/webview_cache"
     private val TAG = "MainActivity"
     private val MAX_BRANDING_ICON_SIZE = 192
-    private val WEBVIEW_DATA_DIRECTORY_SUFFIX = "h5_shell_fresh_profile_v3"
+    private val WEBVIEW_DATA_DIRECTORY_SUFFIX = "h5_shell_fresh_profile_v4"
     private val WEBVIEW_STORAGE_RESET_PREFS = "h5_shell_webview_storage"
     private val WEBVIEW_STORAGE_RESET_KEY = "reset_version"
-    private val WEBVIEW_STORAGE_RESET_VERSION = 3
+    private val WEBVIEW_STORAGE_RESET_VERSION = 4
 
     override fun onCreate(savedInstanceState: android.os.Bundle?) {
         configureWebViewDataDirectory()

lib/main.dart

@@ -217,9 +217,18 @@ class _H5ShellPageState extends State<H5ShellPage> {
       });
     }
 
+    await _clearWebViewHttpCache();
     await _controller.loadRequest(Uri.parse(url));
   }
 
+  Future<void> _clearWebViewHttpCache() async {
+    try {
+      await _controller.clearCache();
+    } catch (_) {
+      // Some WebView implementations can reject cache operations before first use.
+    }
+  }
+
   Future<NavigationDecision> _handleNavigationRequest(
     NavigationRequest request,
   ) async {