android - Broadcast receiver: check the wifi presence -


i have done code exploiting broadcast receiver in order call method on receive when status of connection change , show toast indicating change. in sense have separated class in implemented broadcast receiver in way:

public class receiver extends broadcastreceiver {  private static final string debug_tag = "networkstatusexample";    @override    public void onreceive(context context, intent intent) {        // shows toast when connectivity state change       toast.maketext(context, "stato wifi cambiato",       toast.length_long).show();       log.d("prova", "action: "                  + intent.getaction())         } }

it works recalling correctly method onreceive() when there network state change , showing toast.

in main file have put code once button pressed verifies if wifi connected or not in case showing toast message "wifi connected: true/false" depending on presence or not of connectivity. code works in case is: 

public class mainactivity extends activity {  private static final string debug_tag = "networkstatusexample"; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      connectivitymanager connmgr = (connectivitymanager)              getsystemservice(context.connectivity_service);     networkinfo networkinfo =     connmgr.getnetworkinfo(connectivitymanager.type_wifi);      final boolean iswificonn = networkinfo.isconnected();     string wifistatetext = "no state";     log.d(debug_tag, "wifi connected: " + iswificonn);     button prova = (button) findviewbyid(r.id.button1);     prova.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             context context = getapplicationcontext();              charsequence text = "wifi connected: " + iswificonn;             int duration = toast.length_short;              toast toast = toast.maketext(context, text, duration);             toast.show();         }     });  }

now i'm trying embedding last part of code in method onreceive() defined above in order let's in automatic once there network connectivity change ando resulting code of broadcast receiver one:

public class receiver extends broadcastreceiver {  private static final string debug_tag = "networkstatusexample";   // verifica se il wifi รจ connesso    @override    public void onreceive(context context, intent intent) {        // shows toast when connectivity state change       toast.maketext(context, "stato wifi cambiato",       toast.length_long).show();       log.d("prova", "action: "                  + intent.getaction());         connectivitymanager connmgr = (connectivitymanager)                  getsystemservice(context.connectivity_service);             networkinfo networkinfo = connmgr.getnetworkinfo(connectivitymanager.type_wifi);              final boolean iswificonn = networkinfo.isconnected();           string wifistatetext = "no state";             log.d(debug_tag, "wifi connected: " + iswificonn);        // toast shows if wifi connected       charsequence text = "wifi connected: " + iswificonn;         int duration = toast.length_short;          toast toast = toast.maketext(context, text, duration);         toast.show();          }   }

in case error: 

the method getsystemservice(string) undefined type receiver

on line:

getsystemservice(context.connectivity_service);

what's wrong? have fix it?

you can try :

context.getsystemservice(context.connectivity_service);

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