showFrame emptyModel when pauseCameraWithTimeout

app/src/main/java/com/ouxuan/oxface/OXFaceOnlineActivity.java

@@ -2621,6 +2621,14 @@ public class OXFaceOnlineActivity extends BaseActivity implements View.OnClickLi
             cameraTimeoutHandler.removeCallbacksAndMessages(null);
         }
         
+        // 清空一次画布，确保暂停时画面干净
+        try {
+            LivenessModel emptyModel = new LivenessModel();
+            emptyModel.setTrackFaceInfo(null);
+            showFrame(emptyModel);
+        } catch (Exception e) {
+            LogManager.logError(TAG, "清空画布时发生异常", e);
+        }
         // 设置新的超时任务
         cameraTimeoutHandler = new Handler();
         cameraTimeoutHandler.postDelayed(new Runnable() {