1. 增加申请权限前的提示。2. 使用权限增加权限检测申请

lib/widget/complaint_web_view.dart

@@ -138,6 +138,28 @@ class _ComplaintWebPageState extends State<ComplaintWebPage> {
 
   /// 选择图片底部弹框
   Future<List<String>> _showImagePicker(context) async {
+    if (!await _checkPermission()) {
+      //对话框说明使用相机的目的
+      showDialog(
+          context: context,
+          builder: (context) => AlertDialog(
+                title: const Text("温馨提示"),
+                content: const Text("需要使用相机权限，用于拍摄反馈问题图片"),
+                actions: <Widget>[
+                  TextButton(
+                    child: const Text("取消"),
+                    onPressed: () => Navigator.pop(context),
+                  ),
+                  TextButton(
+                    child: const Text("确定"),
+                    onPressed: () async {
+                      Navigator.pop(context);
+                    },
+                  ),
+                ],
+              ));
+    }
+
     ImageSource? source;
     await showModalBottomSheet(
       backgroundColor: Colors.transparent,
@@ -189,6 +211,16 @@ class _ComplaintWebPageState extends State<ComplaintWebPage> {
     }
   }
 
+  /// 检测是否有权限
+  Future<bool> _checkPermission() async {
+    final permissions = await Permission.camera.status;
+    if (permissions.isGranted) {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
   /// 网页加载完成
   void _onPageFinished(String url) async {
     _title = await _webViewController.getTitle();

lib/widget/select_image_dialog.dart

@@ -88,6 +88,9 @@ class SelectImageDialog extends StatelessWidget {
           break;
       }
     } else {
+      if (!await _requestPermissionCam()) {
+        return;
+      }
       await _callbackImage(source, onSuccess);
     }
   }