android--Determine network status

Usually we play QQ when we do not have Internet, QQ above back to show "network connection does not give force, please check the network connection" then how does it determine whether the network is connected?
Here's a case that shows how to check the status of the network connection
Because we're just testing it out here so our project is just a simple implementation click a button to determine if the device network is connected if the network is connected, a message box prompts "network unobstructed" instead prompts "is your network really connected?"


1. Create a new Android project Textnet (device version 4.4.2)
2. Open Activity_main.xml Add a button
3. Open Mainactivity.java Add a Click event to the button with the anonymous inner class
Note: Anonymous internal classes are not recommended if too many events can be messy, do the same package to build a class to implement convenient modification

The project code is as follows:

Package Com.example.internet;import Android.app.activity;import android.content.pm.packagemanager;import Android.net.connectivitymanager;import Android.os.bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import android.widget.Toast; Public classMainactivity extends Activity {PrivateConnectivitymanager con; PrivateBoolean WiFi; PrivateBoolean Internet; @Overrideprotected voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);                Setcontentview (R.layout.activity_main); //Get handleButton btn1 = (button) This. Findviewbyid (R.id.button1); //Anonymous inner class implements click eventsBtn1.setonclicklistener (NewOnclicklistener () { Public voidOnClick (View v) {//We recommend that you do not use anonymous inner classes.//The try catch is added here to prevent the user experience from being affected by the device not giving permission to the second stop operation.                Try {                    //Monitor network connection Statuscon=(Connectivitymanager) Getsystemservice (Activity.connectivity_service); //Getnetworkinfo getting information for the specified network connection typeWifi=Con.getnetworkinfo (Connectivitymanager.type_wifi). isconnectedorconnecting (); Internet=Con.getnetworkinfo (connectivitymanager.type_mobile). isconnectedorconnecting (); } Catch(Exception e) {e.printstacktrace (); } packagemanager pm=Getpackagemanager (); //determine if you have permissionBoolean Permission = (packagemanager.permission_granted = =Pm.checkpermission ("Android.permission.ACCESS_NETWORK_STATE","com.example.internet")); if(permission) {if(WiFi |Internet) {                          //Toast Frame DisplayToast.maketext (mainactivity. This,                                  "Network unobstructed", Toast.length_long). Show (); }Else{toast.maketext (mainactivity). This,                                   "Pro, is the network connected? ", Toast.length_long). Show (); }                                     }Else {                      //prompt If you don't have permissionToast.maketext (mainactivity. This,                               "Please open the relevant network state permissions, easy to use", Toast.length_long). Show ();    }              }                    }); }

Note: the permission list method

　　

Try {              = Pm.getpackageinfo ("packagename", packagemanager.get_permissions); </span>              = pack.requestedpermissions;              Showtoast (" rights List--->" + permissionstrings.tostring ());           Catch (namenotfoundexception e) {              e.printstacktrace ();          }  

A permission form is reproduced here:

1. Http://www.cnblogs.com/classic/archive/2011/06/20/2085055.html

　　

android--Determine network status