由网友(哪里都是你,)分享简介：荫试图创建连接到网络服务器和retricve数据的应用程序，我希望做一些功能当我点击我的应用程序，它首先检查网络连接是否已启用？如果启用了启动应用程序，否则打开网络连接settings..after它重定向到我的应用程序.... 当应用程序连接到Web服务器，连接特定的时间后超时如果连接不是成功。解决方案 在我的申请，...

荫试图创建连接到网络服务器和retricve数据的应用程序，我希望做一些功能

当我点击我的应用程序，它首先检查网络连接是否已启用？如果启用了启动应用程序，否则打开网络连接settings..after它重定向到我的应用程序.... 当应用程序连接到Web服务器，连接特定的时间后超时如果连接不是成功。解决方案

在我的申请，我也这样定义一个类：

 公共类ConnectionDetector {        私人语境_context;        公共ConnectionDetector（上下文的背景下）{            this._context =背景;        }        / **         *检查所有可能的互联网服务提供商         * ** /        公共布尔isConnectingToInternet（）{            ConnectivityManager连接=（ConnectivityManager）_context.getSystemService（Context.CONNECTIVITY_SERVICE）;              如果（连接！= NULL）              {                  的NetworkInfo []信息= connectivity.getAllNetworkInfo（）;                  如果（信息！= NULL）                      的for（int i = 0; I＆LT; info.length;我++）                          如果（资讯[I] .getState（）== NetworkInfo.State.CONNECTED）                          {                              返回true;                          }              }              返回false;        }    } 

和中，我需要检查连接状态的活动，我用这个：

  //定义了这个全局变量    AlertDialogManager警报=新AlertDialogManager（）; 

在的onCreate（）：

  ConnectionDetector CD =新ConnectionDetector（getApplicationContext（））;    //检查网络present    如果（！cd.isConnectingToInternet（））{        //没有Internet连接present        alert.showAlertDialog（MainActivity.this，网络连接错误            请连接的Internet连接，FALSE）;        //停止执行回code        返回;    } 

哦。差点忘了。如果您还需要重新将用户引导到设置面板，激活互联网上，你可以使用一个意图是这样的：

您可能会促使在AlertDialog用户，并让他们选择，如果他们想。如果是的话，运行这块code的。

 意向意图=新意图（Settings.ACTION_WIFI_SETTINGS）;startActivity（意向）; 

编辑：

我错过了明显的（ Commonsware指出，一出在他的评论中的）。

您需要在许可权的权限添加到您的清单文件。

 ＆LT;使用许可权的android：NAME =android.permission.ACCESS_NETWORK_STATE/＆GT; 

Iam trying to create an application that connect to a webserver and retricve data, i want to do some functions

when i click my application, first it check whether the internet access is enabled? if it is enabled it start the application , else open the internet access settings..after that it redirect to my application.... when the application is connecting to web-server, connection is timed out after a specific time if the connection is not success.

解决方案

In an application of mine, I have a class defined like this:

    public class ConnectionDetector {

        private Context _context;

        public ConnectionDetector(Context context){
            this._context = context;
        }

        /**
         * Checking for all possible internet providers
         * **/
        public boolean isConnectingToInternet(){
            ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
              if (connectivity != null)
              {
                  NetworkInfo[] info = connectivity.getAllNetworkInfo();
                  if (info != null)
                      for (int i = 0; i < info.length; i++)
                          if (info[i].getState() == NetworkInfo.State.CONNECTED)
                          {
                              return true;
                          }

              }
              return false;
        }
    }

And in the Activity that I need to check the connectivity status, I use this:

    // DEFINE THIS AS A GLOBAL VARIABLE
    AlertDialogManager alert = new AlertDialogManager();

In the onCreate():

    ConnectionDetector cd = new ConnectionDetector(getApplicationContext());
    // Check if Internet present
    if (!cd.isConnectingToInternet()) {
        // Internet Connection is not present
        alert.showAlertDialog(MainActivity.this, "Internet Connection Error",
            "Please connect to working Internet connection", false);
        // stop executing code by return
        return;
    }

Oh. Almost forgot. If you also need to re-direct the user to the settings panel to activate Internet, you can use an Intent like this:

You could prompt the user in the AlertDialog and let them choose if they want to. If yes, run this piece of code.

Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);
startActivity(intent);

EDIT:

I missed the obvious (Commonsware pointed that one out in his comment).

You will need to add the ACCESS_NETWORK_STATE permission to your Manifest file.

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />