【优化】修改获取包信息时机

@@ -21,11 +21,7 @@ class AutoTrackConfigManager {
   static final AutoTrackConfigManager instance = AutoTrackConfigManager._();
 
   AutoTrackConfigManager._() {
-    PackageInfo.fromPlatform().then( (value) {
-      _appVersion = value.version;
-      _appName = value.appName;
-      _pkgName = value.packageName;
-    });
+
   }
 
   String _appVersion = '';
@@ -91,6 +87,11 @@ class AutoTrackConfigManager {
   void enableAutoTrack(bool enable) {
     _autoTrackEnable = enable;
     if(enable){
+      PackageInfo.fromPlatform().then( (value) {
+        _appVersion = value.version;
+        _appName = value.appName;
+        _pkgName = value.packageName;
+      });
       DeviceInfoPlugin().deviceInfo.then((value) {
         _deviceInfo = value.data;
         _baseDeviceInfo = value;