Ionic:使用Cordova检查Internet连接

Question

我正在研究Ionic Framework,并面临使用Apache Cordova Network API检测Android App中的互联网连接的问题.我已经参考了这个教程并创建了一个演示项目,它工作正常.

我按照以下步骤操作.[来自教程]

1. ionic start testApp sidemenu

2. ionic platform add android

3. 打开 testApp/www/js/app.js

4. 复制粘贴此代码

   if(window.Connection) {
   
     if(navigator.connection.type == Connection.NONE) {
         alert('There is no internet connection available');
     }else{
         alert(navigator.connection.type);
     }
   }else{
         alert('Cannot find Window.Connection');
   }
   

5. 安装Cordova插件 cordova plugin add org.apache.cordova.network-information

6. 建立 ionic build android

7. 跑 ionic run android

这很好用

问题

8. 复制粘贴www来自mainproject于testApp并执行步骤6和7

我收到警报 Cannot find Window.Connection

复制粘贴后app.js看起来像这样

.run(function($ionicPlatform) {
  $ionicPlatform.ready(function() {
    // Hide the accessory bar by default (remove this to show the accessory bar above the keyboard
    // for form inputs)
    if(window.cordova && window.cordova.plugins.Keyboard) {
      cordova.plugins.Keyboard.hideKeyboardAccessoryBar(true);
    }
    if(window.StatusBar) {
      // org.apache.cordova.statusbar required
      StatusBar.styleDefault();
    }
    // check internet connection
    //alert(window.Connection);
    alert('Hi')
    try {
       alert('Naviagtor says'+navigator.connection.type);
     }
    catch(err) {
       alert( 'Error '+ err.message) 
       //here i get 'Error cannot read property type of undefined'
     }

if(window.Connection) {
    if(navigator.connection.type == Connection.NONE) {
        alert('There is no internet connection available');
    }else{
        alert(navigator.connection.type);
    }
}else{
    alert('Cannot find Window.Connection');
}

  });
})

我复制粘贴一刻我app.js并controllers.js到testApp/www/js目录整个事情炸毁.

任何有关调试的帮助都非常感谢.

谢谢,

注意

我有cordova.js在index.html.

我已经重新安装platforms并plugins复制粘贴后也是如此.

Answer 1

我使用ngcordova解决了类似的问题.它为你提供了一个实现promises的插件的角度包装器.

当您尝试调用它们时,Cordova插件通常没有准备好,使用promise接口可以避免出现未定义的错误.

我偷了ngcordova页面的网络插件的例子在这里.

module.controller('MyCtrl', function($scope, $rootScope, $cordovaNetwork) {

 document.addEventListener("deviceready", function () {

    var type = $cordovaNetwork.getNetwork()

    var isOnline = $cordovaNetwork.isOnline()

    var isOffline = $cordovaNetwork.isOffline()


    // listen for Online event
    $rootScope.$on('networkOffline', function(event, networkState){
      var onlineState = networkState;
    })

    // listen for Offline event
    $rootScope.$on('networkOffline', function(event, networkState){
      var offlineState = networkState;
    })

  }, false);
});

Answer 2

对于任何新访问并且让Armed10的答案有效的问题,你可能想查看我写的帖子,逐步告诉你应该放置一些代码的位置和原因(如果你刚开始的话可能会有用)与Ionic):http://www.nikola-breznjak.com/blog/codeproject/check-network-information-change-with-ionic-famework/.

另外,我在Github上免费提供了示例代码:https://github.com/Hitman666/IonicNetworkInfo.

编辑:根据StackOverflow的规则,我也在这里添加帖子内容:

一步一步如何自己做这件事

通过执行以下操作启动新的Ionic项目:

ionic start IonicNetworkInfo blank

然后,将目录更改为新创建的IonicNetworkInfo:

cd IonicNetworkInfo

使用Bower安装ngCordova:

bower install ngCordova

如果您有可能没有安装bower,可以使用npm安装它:

npm install bower -g

在您喜欢的编辑器中打开www/index.html文件,并添加对ngCordova的引用(就在cordova.js脚本上方):

<!-- This is what you should add, the cordova below you'll already have -->
<script src="lib/ngCordova/dist/ng-cordova.min.js"></script>

<!-- cordova script (this will be a 404 during development) -->
<script src="cordova.js"></script>

通过在终端/命令提示符中执行以下命令来安装ngCordova网络插件(您应该从应用程序的根目录执行此操作;因此,在我们的示例中为IonicNetworkInfo目录):

cordova plugin add org.apache.cordova.network-information

要检查是否已成功安装插件,可以运行以下命令(从根目录 - 我将不再重复此操作;当我说你应该从终端/命令提示符运行一些命令时,在这种情况下,表示从应用程序的根目录):

cordova plugin list

您应该看到以下输出:

> cordova plugin list                                                                                                                           
com.ionic.keyboard 1.0.4 "Keyboard"
org.apache.cordova.network-information 0.2.15 "Network Information"

打开www/js/app.js文件并将ngCordova添加到依赖项列表中,这样第一行基本上如下所示:

angular.module('starter', ['ionic', 'ngCordova'])

在名为MyCtrl的www/js/app.js文件中创建一个新控制器,其中包含以下内容:

.controller('MyCtrl', function($scope, $cordovaNetwork, $rootScope) {
    document.addEventListener("deviceready", function () {

        $scope.network = $cordovaNetwork.getNetwork();
        $scope.isOnline = $cordovaNetwork.isOnline();
        $scope.$apply();

        // listen for Online event
        $rootScope.$on('$cordovaNetwork:online', function(event, networkState){
            $scope.isOnline = true;
            $scope.network = $cordovaNetwork.getNetwork();

            $scope.$apply();
        })

        // listen for Offline event
        $rootScope.$on('$cordovaNetwork:offline', function(event, networkState){
            console.log("got offline");
            $scope.isOnline = false;
            $scope.network = $cordovaNetwork.getNetwork();

            $scope.$apply();
        })

  }, false);
})

在此控制器中,您可以在deviceready事件上附加事件侦听器(因为可能是在运行此代码时设备尚未初始化)并且您获得了以下网络信息:

$cordovaNetwork.getNetwork();

有关您连接到互联网的天气的信息可通过以下行获得:

$scope.isOnline = $cordovaNetwork.isOnline();

然后,您注册两个事件$ cordovaNetwork:online和$ cordovaNetwork:online,当设备联机/离线时触发.在其中,您只需更新$ scope变量().仅供参考,www/js/app.js文件的全部内容应为:

// Ionic Starter App

// angular.module is a global place for creating, registering and retrieving Angular modules
// 'starter' is the name of this angular module example (also set in a <body> attribute in index.html)
// the 2nd parameter is an array of 'requires'
angular.module('starter', ['ionic', 'ngCordova'])

.run(function($ionicPlatform, $cordovaNetwork, $rootScope) {
  $ionicPlatform.ready(function() {
    // Hide the accessory bar by default (remove this to show the accessory bar above the keyboard
    // for form inputs)
    if(window.cordova && window.cordova.plugins.Keyboard) {
      cordova.plugins.Keyboard.hideKeyboardAccessoryBar(true);
    }
    if(window.StatusBar) {
      StatusBar.styleDefault();
    }

  });
})

.controller('MyCtrl', function($scope, $cordovaNetwork, $rootScope) {
    document.addEventListener("deviceready", function () {

        $scope.network = $cordovaNetwork.getNetwork();
        $scope.isOnline = $cordovaNetwork.isOnline();
        $scope.$apply();

        // listen for Online event
        $rootScope.$on('$cordovaNetwork:online', function(event, networkState){
            $scope.isOnline = true;
            $scope.network = $cordovaNetwork.getNetwork();

            $scope.$apply();
        })

        // listen for Offline event
        $rootScope.$on('$cordovaNetwork:offline', function(event, networkState){
            console.log("got offline");
            $scope.isOnline = false;
            $scope.network = $cordovaNetwork.getNetwork();

            $scope.$apply();
        })

  }, false);
});

在index.html文件中,在ion-content标签内部粘贴以下内容:

<div class="card">
    <div class="item item-text-wrap">
        <h1>Network: {{network}}</h1>
    </div>
</div>


<div class="card">
    <div class="item item-text-wrap">
        <ion-toggle ng-model="isOnline" ng-checked="item.checked">
            <h1 ng-show="isOnline">I'm online</h1>
            <h1 ng-show="! isOnline">I'm offline</h1>
        </ion-toggle>
    </div>
</div>

基本上我们在这里做的是显示网络变量的内容(通过控制器附加到$ scope).此外,通过使用离子切换组件,我们显示"我在线"/"我离线"通知.

仅供参考,整个index.html文件的内容应如下所示:

    <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
    <title></title>

    <link href="lib/ionic/css/ionic.css" rel="stylesheet">
    <link href="css/style.css" rel="stylesheet">

    <!-- IF using Sass (run gulp sass first), then uncomment below and remove the CSS includes above
    <link href="css/ionic.app.css" rel="stylesheet">
    -->

    <!-- ionic/angularjs js -->
    <script src="lib/ionic/js/ionic.bundle.js"></script>

    <script src="lib/ngCordova/dist/ng-cordova.min.js"></script>
    <!-- cordova script (this will be a 404 during development) -->
    <script src="cordova.js"></script>

    <!-- your app's js -->
    <script src="js/app.js"></script>
</head>
<body ng-app="starter" ng-controller="MyCtrl">

    <ion-pane>
        <ion-header-bar class="bar-stable">
            <h1 class="title">Ionic Blank Starter</h1>
        </ion-header-bar>

        <ion-content padding="true">
            <div class="card">
                <div class="item item-text-wrap">
                    <h1>Network: {{network}}</h1>
                </div>
            </div>

            <div class="card">
                <div class="item item-text-wrap">
                    <ion-toggle ng-model="isOnline" ng-checked="item.checked">
                        <h1 ng-show="isOnline">I'm online</h1>
                        <h1 ng-show="! isOnline">I'm offline</h1>
                    </ion-toggle>
                </div>
            </div>

        </ion-content>
    </ion-pane>
</body>
</html>

为了测试此应用程序,您应该在您的设备上运行它(因为您无法在iOS模拟器中禁用网络).如果您将Android设备插入计算机(以及所有适当的SDK),则可以运行以下命令以使您的应用在Android设备上运行:

ionic build android && ionic run android