feat:增加消息记录功能

lib/utils/toast_utils.dart

@@ -0,0 +1,37 @@
+import 'package:flutter/material.dart';
+import 'package:fluttertoast/fluttertoast.dart';
+
+class ToastUtils {
+  static void _show({
+    required String msg,
+    Color backgroundColor = Colors.black87,
+    Color textColor = Colors.white,
+    ToastGravity gravity = ToastGravity.CENTER,
+    Toast toastLength = Toast.LENGTH_SHORT,
+  }) {
+    Fluttertoast.showToast(
+      msg: msg,
+      toastLength: toastLength,
+      gravity: gravity,
+      backgroundColor: backgroundColor,
+      textColor: textColor,
+      fontSize: 14.0,
+    );
+  }
+
+  static void success(String msg) {
+    _show(msg: msg, backgroundColor: Colors.green);
+  }
+
+  static void error(String msg) {
+    _show(msg: msg, backgroundColor: Colors.redAccent);
+  }
+
+  static void warning(String msg) {
+    _show(msg: msg, backgroundColor: Colors.orange);
+  }
+
+  static void info(String msg) {
+    _show(msg: msg, backgroundColor: Colors.grey[800]!);
+  }
+}