feat(首页欢迎图, 加入第一次访问判断.):

lib/main.dart

@@ -5,9 +5,12 @@ import 'routers/routers.dart';
 import 'routers/application.dart';
 import 'package:flutter_go/utils/provider.dart';
 import 'package:flutter_go/utils/shared_preferences.dart';
+import 'package:flutter_go/views/first_page/home.dart';
 import 'views/welcome_page/index.dart';
 
 const int ThemeColor = 0xFFC91B3A;
+SpUtil sp;
+var db;
 
 class MyApp extends StatelessWidget {
   MyApp()  {
@@ -15,9 +18,17 @@ class MyApp extends StatelessWidget {
     Routes.configureRoutes(router);
     Application.router = router;
   }
-
+  showWelcomePage() {
+    bool showWelcome = sp.getBool(sharedPreferencesKeys.showWelcome);
+    if (showWelcome == null || showWelcome == true) {
+      return WelcomePage();
+    } else {
+      return AppPage();
+    }
+  }
   @override
   Widget build(BuildContext context) {
+    showWelcomePage();
     return new MaterialApp(
       title: 'title',
       theme: new ThemeData(
@@ -34,19 +45,18 @@ class MyApp extends StatelessWidget {
         ),
       ),
       home: new Scaffold(
-        body: new WelcomePage(),
+        body: showWelcomePage()
       ),
       onGenerateRoute: Application.router.generator,
     );
   }
 }
 
-var db;
 
 void main() async {
   final provider = new Provider();
   await provider.init(true);
-  Application.sharePeferences =  await SpUtil.instance;
+  sp = await SpUtil.getInstance();
   db = Provider.db;
   runApp(new MyApp());
 }

lib/resources/shared_preferences_keys.dart

@@ -7,22 +7,24 @@
  * tartget:  xxx
  */
 
-enum DateType {
-  Int,
-  Double,
-  Bool,
-  String,
-  Dynamic
-}
+//enum DateType {
+//  Int,
+//  Double,
+//  Bool,
+//  String,
+//  Dynamic
+//}
 
-class spKey {
-  String name;
-  DateType type;
-
-  spKey({this.name, this.type});
-}
+//class spKey {
+//  String name;
+//  DateType type;
+//
+//  spKey({this.name, this.type});
+//}
 
 class sharedPreferencesKeys {
-  static spKey loginWelcome = spKey(name: 'loginWelcone', type: DateType.Bool);
+  /// boolean
+  /// 用于欢迎页面. 只有第一次访问才会显示. 或者手动将这个值设为false
+  static String showWelcome = 'loginWelcone';
 }
 

lib/utils/shared_preferences.dart

@@ -1,13 +1,13 @@
 
 import 'dart:async';
 import 'package:shared_preferences/shared_preferences.dart';
-
+export 'package:flutter_go/resources/shared_preferences_keys.dart';
 ///
 /// 用来做shared_preferences的存储
 class SpUtil {
   static SpUtil _instance;
   static Future<SpUtil> get instance async {
-    return await _getInstance();
+    return await getInstance();
   }
 
   static SharedPreferences _spf;
@@ -19,7 +19,8 @@ class SpUtil {
     _spf = await SharedPreferences.getInstance();
   }
 
-  static Future<SpUtil> _getInstance() async  {
+  static Future<SpUtil> getInstance() async  {
+    print("_instance>>$_instance");
     if (_instance == null) {
       _instance = new SpUtil._();
       await _instance._init();
@@ -29,82 +30,89 @@ class SpUtil {
   }
 
   static bool _beforCheck() {
-    String a;
     if (_spf == null) {
-      return throw new StateError("SharedPreferences must be initialized first, but the insurance is null;");
+      return true;
     }
+    return false;
+  }
+  // 判断是否存在数据
+  bool hasKey(String key) {
+    Set keys = getKeys();
+    return keys.contains(key);
   }
 
-  static Set<String> getKeys() {
+  Set<String> getKeys() {
     if (_beforCheck()) return null;
     return _spf.getKeys();
   }
-  dynamic get(String key) {
+
+  get(String key) {
     if (_beforCheck()) return null;
-    return _spf.getKeys();
+    return _spf.get(key);
   }
-  static String getString(String key) {
+
+  getString(String key) {
     if (_beforCheck()) return null;
     return _spf.getString(key);
   }
 
-  static Future<bool> putString(String key, String value) {
+  Future<bool> putString(String key, String value) {
     if (_beforCheck()) return null;
     return _spf.setString(key, value);
   }
 
-  static bool getBool(String key) {
+  bool getBool(String key) {
     if (_beforCheck()) return null;
     return _spf.getBool(key);
   }
 
-  static Future<bool> putBool(String key, bool value) {
+  Future<bool> putBool(String key, bool value) {
     if (_beforCheck()) return null;
     return _spf.setBool(key, value);
   }
 
-  static int getInt(String key) {
+  int getInt(String key) {
     if (_beforCheck()) return null;
     return _spf.getInt(key);
   }
 
-  static Future<bool> putInt(String key, int value) {
+  Future<bool> putInt(String key, int value) {
     if (_beforCheck()) return null;
     return _spf.setInt(key, value);
   }
 
-  static double getDouble(String key) {
+  double getDouble(String key) {
     if (_beforCheck()) return null;
     return _spf.getDouble(key);
   }
 
-  static Future<bool> putDouble(String key, double value) {
+  Future<bool> putDouble(String key, double value) {
     if (_beforCheck()) return null;
     return _spf.setDouble(key, value);
   }
 
-  static List<String> getStringList(String key) {
+  List<String> getStringList(String key) {
     return _spf.getStringList(key);
   }
 
-  static Future<bool> putStringList(String key, List<String> value) {
+  Future<bool> putStringList(String key, List<String> value) {
     if (_beforCheck()) return null;
     return _spf.setStringList(key, value);
   }
 
-  static dynamic getDynamic(String key) {
+  dynamic getDynamic(String key) {
     if (_beforCheck()) return null;
     return _spf.get(key);
   }
 
 
 
-  static Future<bool> remove(String key) {
+  Future<bool> remove(String key) {
     if (_beforCheck()) return null;
     return _spf.remove(key);
   }
 
-  static Future<bool> clear() {
+  Future<bool> clear() {
     if (_beforCheck()) return null;
     return _spf.clear();
   }

lib/views/first_page/first_page.dart

@@ -17,7 +17,7 @@ class FirstPage extends StatefulWidget {
 }
 
 class FirstPageState extends State<FirstPage> with AutomaticKeepAliveClientMixin{
-  Future<SharedPreferences> _prefs=SharedPreferences.getInstance();
+  Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
   Future<bool> _unKnow;
 
   @override

lib/views/fourth_page/pages.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import '../../routers/application.dart';
 import '../../routers/routers.dart';
+import '../../utils/shared_preferences.dart';
 
 final pages = [
   new PageViewModel(
@@ -30,7 +31,7 @@ final pages = [
 class Page extends StatelessWidget {
   final PageViewModel viewModel;
   final double percentVisible;
-
+  SpUtil sp;
   Page({
     this.viewModel,
     this.percentVisible = 1.0,
@@ -43,8 +44,10 @@ class Page extends StatelessWidget {
   Widget creatButton(
       BuildContext context, String txt, IconData iconName, String type) {
     return RaisedButton.icon(
-        onPressed: () {
+        onPressed: () async {
           if (type == 'start') {
+            await SpUtil.getInstance()
+              ..putBool(sharedPreferencesKeys.showWelcome, false);
             _goHomePage(context);
           } else if (type == 'goGithub') {
             Application.router.navigateTo(context,