add update version

lib/main.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:core';
 
 import 'package:flutter/material.dart';
 import 'package:fluro/fluro.dart';
@@ -37,15 +38,16 @@ class MyApp extends StatefulWidget {
 class _MyAppState extends State<MyApp> {
   bool _hasLogin = false;
   bool _isLoading = true;
-  String localVersion;
-  String currVersion;
 
   @override
   Future initState() {
     super.initState();
-
+    var platformAandroid =
+        (Theme.of(context).platform == TargetPlatform.android);
     DataUtils.checkVersion({'name': 'FlutterGo'}).then((bool) {
-      if (bool) {
+      print("返回值back ${bool}");
+      if (platformAandroid && bool) {
+        setState(() {});
         _UpdateURL();
       }
     }).catchError((onError) {
@@ -66,6 +68,16 @@ class _MyAppState extends State<MyApp> {
     });
   }
 
+  _UpdateURL() async {
+    const currUrl =
+        'https://github.com/alibaba/flutter-go/raw/master/FlutterGo.apk';
+    if (await canLaunch(currUrl)) {
+      await launch(currUrl);
+    } else {
+      throw 'Could not launch $currUrl';
+    }
+  }
+
   showWelcomePage() {
     if (_isLoading) {
       return Container(
@@ -84,16 +96,6 @@ class _MyAppState extends State<MyApp> {
     }
   }
 
-  _UpdateURL() async {
-    const currUrl =
-        'https://github.com/alibaba/flutter-go/raw/master/FlutterGo.apk';
-    if (await canLaunch(currUrl)) {
-      await launch(currUrl);
-    } else {
-      throw 'Could not launch $currUrl';
-    }
-  }
-
   @override
   Widget build(BuildContext context) {
     return new MaterialApp(

lib/utils/data_utils.dart

@@ -2,6 +2,7 @@ import 'dart:async' show Future;
 
 import 'package:flutter_go/model/version.dart';
 import 'package:package_info/package_info.dart';
+import 'package:url_launcher/url_launcher.dart';
 
 import './net_utils.dart';
 import '../model/user_info.dart';
@@ -38,18 +39,15 @@ class DataUtils {
     var response = await NetUtils.get(Api.VERSION, params);
     Version version = Version.formJson(response);
     var currVersion = version.data.version;
-    PackageInfo.fromPlatform().then((PackageInfo packageInfo) {
+    PackageInfo packageInfo = await PackageInfo.fromPlatform();
     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
+    //相同=0、大于=1、小于=-1
+//    localVersion = '0.0.2';
+//    currVersion = '1.0.6';
     if (currVersion.compareTo(localVersion) == 1) {
-        print('currVersion: true');
       return true;
     } else {
-        print('currVersion: flase');
       return false;
     }
-    });
   }
 }

version.json

@@ -1,7 +0,0 @@
-{
-
-  "name": "FlutterGo",
-
-  "version": "1.0.3"
-
-}