1、优化导包

lib/amap_flutter_map.dart

@@ -2,7 +2,6 @@
 library amap_flutter_map;
 
 import 'dart:async';
-import 'dart:typed_data';
 
 import 'package:amap_flutter_base/amap_flutter_base.dart';
 import 'package:amap_flutter_map/src/core/amap_flutter_platform.dart';
@@ -14,6 +13,7 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
+export 'package:amap_flutter_base/amap_flutter_base.dart';
 export 'package:amap_flutter_map/src/types/types.dart';
 
 part 'src/amap_controller.dart';