增加null-safety,和引入说明

15441a7e · 汪林玲 · 313fd347 · 15441a7e
Commit 15441a7e authored Oct 15, 2021 by 汪林玲
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lib/umeng_crash.dart lib/umeng_crash.dart +0 -2

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--- a/lib/umeng_crash.dart
+++ b/lib/umeng_crash.dart
 import 'dart:async';
-
-import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';

 class UmengCrash {