refactor(many files): 页面部分的文件结构调整

1.views 文件夹里面分类，页面相关文件;2.公共组件全部放在components里;3.创建resources文件夹放置资源dart文件4.修改二级菜单文字大小

BREAKING CHANGE: 重构，建议删除本地db,再编译

lib/utils/util.dart

@@ -0,0 +1,90 @@
+import 'package:flutter/material.dart';
+
+const Map<String, Color> emumMap = const {
+  "Objective-C": Color(0xFF438EFF),
+  "Perl": Color(0xFF0298C3),
+  "Python": Color(0xFF0298C3),
+  "JavaScript": Color(0xFFF1E05A),
+  "PHP": Color(0xFF4F5D95),
+  "R": Color(0xFF188CE7),
+  "Lua": Color(0xFFC22D40),
+  "Scala": Color(0xFF020080),
+  "Swift": Color(0xFFFFAC45),
+  "Kotlin": Color(0xFFF18E33),
+  "Vue": Colors.black,
+  "Ruby": Color(0xFF701617),
+  "Shell": Color(0xFF89E051),
+  "TypeScript": Color(0xFF2B7489),
+  "C++": Color(0xFFF34B7D),
+  "CSS": Color(0xFF563C7C),
+  "Java": Color(0xFFB07219),
+  "C#": Color(0xFF178600),
+  "Go": Color(0xFF375EAB),
+  "Erlang": Color(0xFFB83998),
+  "C": Color(0xFF555555),
+};
+
+class Util {
+  static String getTimeDuration(String comTime) {
+    var nowTime = DateTime.now();
+    var compareTime = DateTime.parse(comTime);
+    if (nowTime.isAfter(compareTime)) {
+      if (nowTime.year == compareTime.year) {
+        if (nowTime.month == compareTime.month) {
+          if (nowTime.day == compareTime.day) {
+            if (nowTime.hour == compareTime.hour) {
+              if (nowTime.minute == compareTime.minute) {
+                return '片刻之间';
+              }
+              return (nowTime.minute - compareTime.minute).toString() + '分钟前';
+            }
+            return (nowTime.hour - compareTime.hour).toString() + '小时前';
+          }
+          return (nowTime.day - compareTime.day).toString() + '天前';
+        }
+        return (nowTime.month - compareTime.month).toString() + '月前';
+      }
+      return (nowTime.year - compareTime.year).toString() + '年前';
+    }
+    return 'time error';
+  }
+
+  static double setPercentage(percentage, context) {
+    return MediaQuery.of(context).size.width * percentage;
+  }
+
+  static Color getLangColor(String language) {
+    if (emumMap.containsKey(language)) {
+      return emumMap[language];
+    }
+    return Colors.black26;
+  }
+
+  static String getTimeDate(String comTime) {
+    var compareTime = DateTime.parse(comTime);
+    String weekDay = '';
+    switch (compareTime.weekday) {
+      case 2:
+        weekDay = '周二';
+        break;
+      case 3:
+        weekDay = '周三';
+        break;
+      case 4:
+        weekDay = '周四';
+        break;
+      case 5:
+        weekDay = '周五';
+        break;
+      case 6:
+        weekDay = '周六';
+        break;
+      case 7:
+        weekDay = '周日';
+        break;
+      default:
+        weekDay = '周一';
+    }
+    return '${compareTime.month}-${compareTime.day}  $weekDay';
+  }
+}