Android后台服务或接收器可在后台检查互联网连接

Question

在我的应用程序中，我总是借助互联网连接到openfire服务器。现在，如果之间的连接丢失或断开连接，我希望它弹出一个窗口，然后按“确定”按钮，它应该重新登录此人（就像与服务器的连接丢失一样，即使该连接持续1秒钟，断开连接）。

我正在使用以下代码：

public class ConnectionCheck extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

        ConnectivityManager connectivityManager =  (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
        NetworkInfo mobileNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

        if(activeNetInfo!=null){
            Toast.makeText( context, "Active Network Type : " + activeNetInfo.getTypeName(), Toast.LENGTH_SHORT ).show();
        }

         if( mobileNetInfo != null )
            {
              Toast.makeText( context, "Mobile Network Type : " + mobileNetInfo.getTypeName(), Toast.LENGTH_SHORT ).show();
            }

    }

假设当wifi断开连接时，它再次连接到移动网络（但内部用户未连接到服务器）

我应该怎么做，即当用户断开连接时-即使从服务器断开一秒钟，它也应该弹出一个窗口。

可能吗？？

谢谢

Answer 1

-您的上述代码仅会检查您的android设备与wifi路由器或手机的数据包服务的连接，但不会检查wifi是否确实可以正常连接互联网。

-在我从事项目工作时，曾经一次被人找到这种解决方案，我试图在stackoverflow上寻找它，但我得到的只是与您一样的代码。所以我创建了自己的解决方案。

我需要做一些自定义工作..但要启动并运行...

关闭时，我的代码从Wifi切换到移动网络。

我在端口37上使用TimeService来知道WiFi连接仍然打开时Internet已死

现在，我将此处编写的完整工作代码放入此处。请原谅我DRY（不要重复自己的原则）在这里。因此single sensible place，在生产网络中使用时，请重构代码并将重复的代码转换为method，即转换为，

/////---------------------------Intial Available Network Checking



private boolean checkConnection(){


boolean connected = false;
ConnectivityManager cm =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

if (cm != null) {
NetworkInfo[] netInfo = cm.getAllNetworkInfo();

for (NetworkInfo ni : netInfo) {
if ((ni.getTypeName().equalsIgnoreCase("WIFI")
|| ni.getTypeName().equalsIgnoreCase("MOBILE"))
& ni.isConnected() & ni.isAvailable()) {
connected = true;
     }

   }
 }


return connected;
} /////---------------------------Intial Available Network Checking

///// -------------------------------检查互联网连接是否正常

public boolean inetAddr(){

    boolean x1 = false;


    try {
        Socket s = new Socket("utcnist.colorado.edu", 37);

        InputStream i = s.getInputStream();

        Scanner scan = new Scanner(i);

        while(scan.hasNextLine()){

            System.out.println(scan.nextLine());
            x1 = true;
        }
    } catch (Exception e) {


            x1 = false;
    } 

    return x1;

}

/////-------------------------------Check for the working Internet Connection


////-------------------------------Check Mobile Conectivity Again

public boolean mobileConnect(){

    boolean conn = false;
    ConnectivityManager cm =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNet = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

    if(activeNet != null){

        conn = true;
    }else{

        conn = false;
    }

    return conn;



}

////------------------------------Check Mobile Conectivity Again

在这里我正在使用上述方法....

try{    
     if (!checkConnection()){


         AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(YumZingSplashActivity.this);
         myAlertDialog.setTitle("--- Connectivity Check ---");
         myAlertDialog.setMessage("No Internet Connectivity");
         myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

          public void onClick(DialogInterface arg0, int arg1) {

            YumZingSplashActivity.this.finish();
            //splashHandler.removeCallbacks(launcherRunnable);

          }});
            System.out.println("No Internet Connectivity");

            myAlertDialog.show();           




        }
        else{


              if(inetAddr()){
            aphandle = APIHandling.getInstance();
            aphandle.xmlCreateSession();
            System.out.println("Net Connectivity is Present");
            DURATION = Integer.valueOf(getString(R.string.splash_duration));



            splashHandler = new Handler();

            //  ================ Main Code of the Application
            launcherRunnable = new Runnable() {

                public void run() {
                    Intent i = new Intent(YumZingSplashActivity.this, YumZingTabHostActivity.class);
                    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(i);
                    YumZingSplashActivity.this.finish();
                }
            };
            if (DEBUG)
            {
                splashHandler.post(launcherRunnable);
            }
            else{


                splashHandler.postDelayed(launcherRunnable, DURATION);
            }

        }
              else{

                  if(mobileConnect()){


                      if(inetAddr()){
                      aphandle = APIHandling.getInstance();
                        aphandle.xmlCreateSession();
                        System.out.println("Net Connectivity is Present");
                        DURATION = Integer.valueOf(getString(R.string.splash_duration));



                        splashHandler = new Handler();

                        //  ================ Main Code of the Application
                        launcherRunnable = new Runnable() {

                            public void run() {
                                Intent i = new Intent(YumZingSplashActivity.this, YumZingTabHostActivity.class);
                                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(i);
                                YumZingSplashActivity.this.finish();
                            }
                        };
                        if (DEBUG)
                        {
                            splashHandler.post(launcherRunnable);
                        }
                        else{


                            splashHandler.postDelayed(launcherRunnable, DURATION);
                        }
                      }else{

                          AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(YumZingSplashActivity.this);
                         myAlertDialog.setTitle("--- Connectivity Check ---");
                         myAlertDialog.setMessage("No Internet Connectivity");
                         myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                          public void onClick(DialogInterface arg0, int arg1) {

                            YumZingSplashActivity.this.finish();
                            //splashHandler.removeCallbacks(launcherRunnable);

                          }});
                            System.out.println("No Internet Connectivity");

                            myAlertDialog.show();       
                      }
                  }else{




                         AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(YumZingSplashActivity.this);
                         myAlertDialog.setTitle("--- Connectivity Check ---");
                         myAlertDialog.setMessage("No Internet Connectivity");
                         myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                          public void onClick(DialogInterface arg0, int arg1) {

                            YumZingSplashActivity.this.finish();
                            //splashHandler.removeCallbacks(launcherRunnable);

                          }});
                            System.out.println("No Internet Connectivity");

                            myAlertDialog.show();           






                  }

              }
        }

     //setContentView(R.layout.yumzing_splash_layout);
    }  catch(Exception ex){

            System.out.println("Leak ko catch");
        }



    }