fix；切割下载路径

example/lib/main.dart

 import 'package:apk_update/apk_update.dart';
+import 'package:apk_update/utils/toast_util.dart';
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 
@@ -52,6 +53,9 @@ class _MyAppState extends State<MyApp> {
                       "productCode": "carrier-driver-app",
                     },
                     onceDay: false,
+                    downloadApkError: () {
+                      ToastUtil.showToast('下载Apk错误');
+                    },
                     paramsOSS: map,
                     appleId: "1585610919");
               },

lib/apk_update.dart

@@ -89,8 +89,8 @@ class ApkUpdate {
                   "product-code": params["productCode"]
                 }))
             .then((res) {
-          if (res.data == null || res.data['code'] != 0) {
-            debugPrint('获取OSS授权失败');
+          if (res.data == null || res.data is String) {
+            debugPrint('获取OSS授权失败: ${res.data}');
             downloadApkError?.call();
             return;
           }
@@ -100,6 +100,9 @@ class ApkUpdate {
           var sk = map?["onceAccessKeySecret"];
           var token = map?["onceSecurityToken"];
           var objectKey = apkPath ?? "";
+          // apkPath https://mslapp-download.oss-cn-beijing.aliyuncs.com/msl-chengyun.apk 截取后：msl-chengyun.apk
+          objectKey = objectKey.substring(objectKey.lastIndexOf("/") + 1);
+
           var endpoint = paramsOSS?["endpoint"];
           var bucketName = paramsOSS?["bucketName"];
           var localPath = path;
@@ -110,6 +113,10 @@ class ApkUpdate {
           }
           ApkUpdatePlatform.instance.downloadApk(
               ak, sk, token, objectKey, endpoint, bucketName, localPath);
+        }).catchError((e) {
+          debugPrint('获取OSS授权失败');
+          downloadApkError?.call();
+          return;
         });
       },
       downloadApkError: () {