add update version

lib/utils/data_utils.dart

@@ -0,0 +1,55 @@
+import 'dart:async' show Future;
+
+import 'package:flutter_go/model/version.dart';
+import 'package:package_info/package_info.dart';
+
+import './net_utils.dart';
+import '../model/user_info.dart';
+import 'package:flutter_go/api/api.dart';
+
+class DataUtils {
+  // 登陆获取用户信息
+  static Future<UserInfo> doLogin(Map<String, String> params) async {
+    var response = await NetUtils.post(Api.DO_LOGIN, params);
+    UserInfo userInfo = UserInfo.fromJson(response['data']);
+    return userInfo;
+  }
+
+  // 验证登陆
+
+  static Future<bool> checkLogin() async {
+    var response = await NetUtils.get(Api.CHECK_LOGIN);
+    print('验证登陆：$response');
+    return response['success'];
+  }
+
+  // 退出登陆
+  static Future<bool> logout() async {
+    var response = await NetUtils.get(Api.LOGOUT);
+    print('退出登陆 $response');
+    return response['success'];
+  }
+
+  /**
+   * {"status":200,"data":{"version":"0.0.2","name":"FlutterGo"},"success":true}
+   */
+  // 检查版本
+  static Future<bool> checkVersion(Map<String, String> params) async {
+    var response = await NetUtils.get(Api.VERSION, params);
+    Version version = Version.formJson(response);
+    var currVersion = version.data.version;
+    PackageInfo.fromPlatform().then((PackageInfo packageInfo) {
+      var localVersion = packageInfo.version;
+      //0:相同、1:大于、-1:小于
+      //currVersion: 1.0.6 // localVersion：0.0.2 //packbuildNumber  1 true
+      //currVersion: 1.0.6 // localVersion：2.0.2 //packbuildNumber  -1 false
+      if (currVersion.compareTo(localVersion) == 1) {
+        print('currVersion: true');
+        return true;
+      } else {
+        print('currVersion: flase');
+        return false;
+      }
+    });
+  }
+}