Fix VPN icon persisting in status bar after stopping service (#5476)

* Initial plan

* Fix VPN icon remaining in status bar after stopping service

Agent-Logs-Url: https://github.com/2dust/v2rayNG/sessions/4377b941-8f02-4d92-abc6-0f98fd6c9b60

Co-authored-by: 2dust <31833384+2dust@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: 2dust <31833384+2dust@users.noreply.github.com>

V2rayNG/app/src/main/java/com/v2ray/ang/service/V2RayVpnService.kt

@@ -93,6 +93,21 @@ class V2RayVpnService : VpnService(), ServiceControl {
     override fun onDestroy() {
         super.onDestroy()
         Log.i(AppConfig.TAG, "StartCore-VPN: Service destroyed")
+
+        // Ensure VPN interface is properly closed when the service is destroyed without
+        // going through stopAllService() (e.g. when killed unexpectedly). isRunning is
+        // set to false at the start of stopAllService(), so this guard prevents a double-close.
+        if (isRunning) {
+            try {
+                if (::mInterface.isInitialized) {
+                    mInterface.close()
+                    Log.i(AppConfig.TAG, "StartCore-VPN: VPN interface closed in onDestroy")
+                }
+            } catch (e: Exception) {
+                Log.e(AppConfig.TAG, "StartCore-VPN: Failed to close interface in onDestroy", e)
+            }
+        }
+
         NotificationManager.cancelNotification()
     }
 
@@ -356,9 +371,19 @@ class V2RayVpnService : VpnService(), ServiceControl {
             //which means the first v2ray core somehow failed to stop and release the port.
             stopSelf()
 
+            // Add a small delay to allow the async core stop operation to complete
+            // before closing the VPN interface, preventing a race condition that can
+            // leave the VPN icon in the status bar after stopping the service.
+            try {
+                Thread.sleep(100)
+            } catch (e: InterruptedException) {
+                Log.w(AppConfig.TAG, "StartCore-VPN: Sleep interrupted", e)
+            }
+
             try {
                 if (::mInterface.isInitialized) {
                     mInterface.close()
+                    Log.i(AppConfig.TAG, "StartCore-VPN: VPN interface closed")
                 }
             } catch (e: Exception) {
                 Log.e(AppConfig.TAG, "StartCore-VPN: Failed to close interface", e)