Android detects whether the current network is available

In Android Program The first step is to check whether the current network is available. If no network is available, exit the program if (isconnect (this) = false) {New alertdialog. builder (this ). settitle ("network error "). setmessage ("network connection failed, please confirm network connection "). setpositivebutton ("OK", new dialoginterface. onclicklistener () {@ override public void onclick (dialoginterface arg0, int arg1) {// todo auto-generated method stub android. OS. process. killprocess (Android. OS. process. mypid (); system. exit (0 );}}). show ();} publi C static Boolean isconnect (context) {// obtain all connection management objects of the mobile phone (including management of Wi-Fi and net connections) Try {connectivitymanager connectivity = (connectivitymanager) context. getsystemservice (context. connectivity_service); If (connectivity! = NULL) {// obtain the network connection management object networkinfo info = connectivity. getactivenetworkinfo (); If (info! = NULL & info. isconnected () {// determine whether the current network is connected to If (info. getstate () = networkinfo. state. connected) {return true ;}}} catch (exception e) {// todo: handle exception log. V ("error", E. tostring ();} return false;} Add the permission <uses-Permission Android: Name = "android. permission. access_network_state "/>