flutter开发常见问题

1. Error on line 6, column 5 of pubspec.yaml: A dependency may only have one source.
   sdk: flutter
   ^^^^^^^^^^^^^
   方法：dio要引入要对齐
   

2. -Waiting for another flutter command to release the startup lock。
   方法：
   1、打开flutter的安装目录/bin/cache/
   2、删除lockfile文件
   3、重启AndroidStudio

3. 由于在国内访问Flutter有时可能会受到限制，Flutter官方为中国开发者搭建了临时镜像，大家可以将如下环境变量加入到用户环境变量中：

   export PUB_HOSTED_URL=https://pub.flutter-io.cn
   export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

4. type ‘Future’ is not a subtype of type 'Response

void getHttp() async {
    try {
      Response response =  DioManager.singleton.dio.get("http://www.baidu.com");

      print(response);
    } catch (e) {
      print(e);
    }
  }

网络请求返回错误
原因：少了 await
应该是

void getHttp() async {
    try {
      Response response = await DioManager.singleton.dio.get("http://www.baidu.com");

      print(response);
    } catch (e) {
      print(e);
    }
  }