结构初始化

lib/core/utils.dart

@@ -0,0 +1,42 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+void unawaited(Future<void> future) {}
+
+bool isDarkMode(BuildContext context) =>
+    Theme.of(context).brightness == Brightness.dark;
+
+void showSnackBar(BuildContext context, Widget child) =>
+    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: child));
+
+void showSnackBarWithAction(
+    BuildContext context, String content, String action, Function onTap) {
+  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+    content: Text(content),
+    action: SnackBarAction(
+      label: action,
+      onPressed: () => onTap,
+    ),
+  ));
+}
+
+Future<bool> openUrl(String url) async {
+  print('openUrl $url');
+
+  if (!await canLaunch(url)) {
+    print('canLaunch false');
+    return false;
+  }
+
+  final ok = await launch(url, forceSafariVC: false);
+
+  if (ok == true) {
+    return true;
+  }
+
+  print('launch $url failed');
+
+  return false;
+}