diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java
index b845c3e..9c62856 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java
@@ -65,6 +65,10 @@ public class MainActivity extends BaseMvvmActivity<MainViewModel, ActivityMainBi
             screenCaptureService.setStateListener(MainActivity.this);
             setupLocalPreview();
             setupResolutionSpinner();
+            // 重新绑定（如 Activity 销毁后重新打开）时，依据服务实际状态恢复界面显示为“运行中”。
+            if (screenCaptureService.isStreaming()) {
+                updateUI(true);
+            }
         }
 
         @Override
@@ -121,6 +125,22 @@ public class MainActivity extends BaseMvvmActivity<MainViewModel, ActivityMainBi
     @Override
     protected void onResume() {
         super.onResume();
+        // MainActivity 关闭后 ScreenCaptureService 仍在后台串流。重新打开时检查服务是否正在
+        // 采集/串流屏幕，若是则重新绑定并恢复界面状态，避免串流状态丢失。
+        checkServiceRunningOnResume();
+    }
+
+    /**
+     * 重新打开 Activity 时检查后台 ScreenCaptureService 是否仍在串流/采集屏幕。
+     * 若是，则重新绑定服务（不会重复创建，服务此前已作为前台服务启动），并由
+     * onServiceConnected 恢复界面为“运行中”状态。
+     */
+    private void checkServiceRunningOnResume() {
+        ScreenCaptureService service = ScreenCaptureService.getInstance();
+        if (service != null && service.isStreaming() && !isBound) {
+            Intent serviceIntent = new Intent(this, ScreenCaptureService.class);
+            bindService(serviceIntent, serviceConnection, BIND_AUTO_CREATE);
+        }
     }
 
     /** 弹窗提示开启无障碍服务；同一运行周期内仅提示一次。 */
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
index 3fbf635..ecbf0c5 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
@@ -317,6 +317,14 @@ public class ScreenCaptureService extends Service {
         return webRtcClient;
     }
 
+    /**
+     * 供 MainActivity 启动/恢复时查询：服务是否正在采集并串流屏幕。
+     * 用于 Activity 被销毁后重新打开时恢复界面状态，避免“服务仍在后台串流但界面显示已停止”的状态丢失问题。
+     */
+    public boolean isStreaming() {
+        return screenCapturer != null && !isShuttingDown;
+    }
+
     /**
      * 切换屏幕采集分辨率（本地 UI 调用）。
      *