diff --git a/app/src/main/cpp/yolov8ncnn.cpp b/app/src/main/cpp/yolov8ncnn.cpp
index 9edfe04..c86b245 100644
--- a/app/src/main/cpp/yolov8ncnn.cpp
+++ b/app/src/main/cpp/yolov8ncnn.cpp
@@ -56,9 +56,9 @@
     return 0;
 }
 
-static Yolo *g_yolo = nullptr;
+static Yolo *yolo_ptr = nullptr;
 static ncnn::Mutex lock;
-static JavaVM *javaVM = nullptr;
+static JavaVM *jvm_ptr = nullptr;
 
 class MyNdkCamera : public NdkCameraWindow {
 public:
@@ -66,31 +66,30 @@
 };
 
 void MyNdkCamera::on_image_render(cv::Mat &rgb) const {
-    // nanodet
     {
         ncnn::MutexLockGuard g(lock);
 
-        if (g_yolo) {
+        if (yolo_ptr) {
             //分类
-            g_yolo->classify(rgb);
+            yolo_ptr->classify(rgb);
 
             std::vector<Object> objects;
 
             //分割
-            g_yolo->segmentation(rgb, objects);
+            yolo_ptr->segmentation(rgb, objects);
 
             //检测
-            g_yolo->detect(rgb, objects);
+            yolo_ptr->detect(rgb, objects);
 
             //绘制
-            g_yolo->draw(rgb, objects);
+            yolo_ptr->draw(rgb, objects);
         } else {
             draw_unsupported(rgb);
         }
     }
 }
 
-static MyNdkCamera *g_camera = nullptr;
+static MyNdkCamera *camera_ptr = nullptr;
 
 //分割、检测、分类
 const char *model_types[] = {"best-sim-opt-fp16", "br-detect-20240913-sim-fp16", "model.ncnn"};
@@ -110,9 +109,9 @@
 JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *reserved) {
     __android_log_print(ANDROID_LOG_DEBUG, "ncnn", "JNI_OnLoad");
 
-    javaVM = vm;
+    jvm_ptr = vm;
 
-    g_camera = new MyNdkCamera;
+    camera_ptr = new MyNdkCamera;
 
     return JNI_VERSION_1_4;
 }
@@ -123,12 +122,12 @@
     {
         ncnn::MutexLockGuard g(lock);
 
-        delete g_yolo;
-        g_yolo = nullptr;
+        delete yolo_ptr;
+        yolo_ptr = nullptr;
     }
 
-    delete g_camera;
-    g_camera = nullptr;
+    delete camera_ptr;
+    camera_ptr = nullptr;
 }
 
 JNIEXPORT jboolean JNICALL
@@ -152,11 +151,11 @@
 
         if (use_gpu && ncnn::get_gpu_count() == 0) {
             // no gpu
-            delete g_yolo;
-            g_yolo = nullptr;
+            delete yolo_ptr;
+            yolo_ptr = nullptr;
         } else {
-            if (!g_yolo)
-                g_yolo = new Yolo;
+            if (!yolo_ptr)
+                yolo_ptr = new Yolo;
             int state;
             if (use_classify) {
                 state = 1;
@@ -167,8 +166,8 @@
             if (use_detect) {
                 state = 3;
             }
-            g_yolo->j_state = state;
-            g_yolo->load(
+            yolo_ptr->j_state = state;
+            yolo_ptr->load(
                     mgr,
                     model_type,
                     target_size,
@@ -203,14 +202,14 @@
 
             if (use_gpu && ncnn::get_gpu_count() == 0) {
                 // no gpu
-                delete g_yolo;
-                g_yolo = nullptr;
+                delete yolo_ptr;
+                yolo_ptr = nullptr;
             } else {
-                if (!g_yolo)
-                    g_yolo = new Yolo;
-                g_yolo->j_state = 2;
+                if (!yolo_ptr)
+                    yolo_ptr = new Yolo;
+                yolo_ptr->j_state = 2;
                 if (*id == 0) {
-                    g_yolo->load(
+                    yolo_ptr->load(
                             mgr,
                             model_type,
                             target_size,
@@ -222,7 +221,7 @@
                             use_gpu
                     );
                 } else {
-                    g_yolo->load(
+                    yolo_ptr->load(
                             mgr,
                             model_type,
                             target_size,
@@ -248,8 +247,10 @@
 
     __android_log_print(ANDROID_LOG_DEBUG, "ncnn", "openCamera %d", facing);
 
-    g_camera->open((int) facing);
-
+    if (camera_ptr == nullptr) {
+        return JNI_FALSE;
+    }
+    camera_ptr->open((int) facing);
     return JNI_TRUE;
 }
 
@@ -258,8 +259,10 @@
 
     __android_log_print(ANDROID_LOG_DEBUG, "ncnn", "closeCamera");
 
-    g_camera->close();
-
+    if (camera_ptr == nullptr) {
+        return JNI_FALSE;
+    }
+    camera_ptr->close();
     return JNI_TRUE;
 }
 
@@ -270,21 +273,33 @@
                                                           jobject native_callback) {
     ANativeWindow *win = ANativeWindow_fromSurface(env, surface);
 
-    g_camera->set_window(win);
+    if (camera_ptr == nullptr) {
+        return JNI_FALSE;
+    }
+    camera_ptr->set_window(win);
 
-    g_yolo->initNativeCallback(javaVM, nativeObjAddr, native_callback);
+    if (yolo_ptr == nullptr) {
+        return JNI_FALSE;
+    }
+    yolo_ptr->initNativeCallback(jvm_ptr, nativeObjAddr, native_callback);
     return JNI_TRUE;
 }
 
 JNIEXPORT jboolean JNICALL
 Java_com_casic_br_app_external_Yolov8ncnn_onPause(JNIEnv *env, jobject thiz) {
-    g_yolo->j_state = 0;
+    if (yolo_ptr == nullptr) {
+        return JNI_FALSE;
+    }
+    yolo_ptr->j_state = 0;
     return JNI_TRUE;
 }
 
 JNIEXPORT jboolean JNICALL
 Java_com_casic_br_app_external_Yolov8ncnn_onRestart(JNIEnv *env, jobject thiz) {
-    g_yolo->j_state = 3;
+    if (yolo_ptr == nullptr) {
+        return JNI_FALSE;
+    }
+    yolo_ptr->j_state = 3;
     return JNI_TRUE;
 }
 }
\ No newline at end of file