http 初始化

lib/http/interceptor.dart

@@ -0,0 +1,71 @@
+import 'package:dio/dio.dart';
+import 'package:connectivity_plus/connectivity_plus.dart';
+
+class ApiInterceptor extends Interceptor {
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    // print("请求之前");
+    // 在请求之前添加头部或认证信息
+    // options.headers['Authorization'] = 'Bearer token';
+    // options.headers['Content-Type'] = 'application/json';
+    handler.next(options);
+  }
+
+  @override
+  void onResponse(Response response, ResponseInterceptorHandler handler) {
+    // print("响应之前");
+    handler.next(response);
+  }
+
+  @override
+  void onError(DioError err, ErrorInterceptorHandler handler) {
+    // 处理网络请求错误
+
+    handler.next(err);
+    super.onError(err, handler);
+  }
+
+  static Future dioError(DioError error) async {
+    switch (error.type) {
+      case DioErrorType.badCertificate:
+        return '证书有误！';
+      case DioErrorType.badResponse:
+        return '服务器异常，请稍后重试！';
+      case DioErrorType.cancel:
+        return "请求已被取消，请重新请求";
+      case DioErrorType.connectionError:
+        return '连接错误，请检查网络设置';
+      case DioErrorType.connectionTimeout:
+        return "网络连接超时，请检查网络设置";
+      case DioErrorType.receiveTimeout:
+        return "响应超时，请稍后重试！";
+      case DioErrorType.sendTimeout:
+        return "发送请求超时，请检查网络设置";
+      case DioErrorType.unknown:
+        var res = await checkConect();
+        return "$res 网络异常，请稍后重试！";
+      default:
+        return "Dio异常";
+    }
+  }
+
+  static Future<dynamic> checkConect() async {
+    final connectivityResult = await (Connectivity().checkConnectivity());
+    if (connectivityResult == ConnectivityResult.mobile) {
+      return 'connected with mobile network';
+    } else if (connectivityResult == ConnectivityResult.wifi) {
+      return 'connected with wifi network';
+    } else if (connectivityResult == ConnectivityResult.ethernet) {
+      // I am connected to a ethernet network.
+    } else if (connectivityResult == ConnectivityResult.vpn) {
+      // I am connected to a vpn network.
+      // Note for iOS and macOS:
+      // There is no separate network interface type for [vpn].
+      // It returns [other] on any device (also simulator)
+    } else if (connectivityResult == ConnectivityResult.other) {
+      // I am connected to a network which is not in the above mentioned networks.
+    } else if (connectivityResult == ConnectivityResult.none) {
+      return 'not connected to any network';
+    }
+  }
+}