networking - Display the network connection 2g/3g or 4g in a toast -

i display in toast network connection available. when start app shows me layout, doesn't make toast. did forget something?

// shows every second toast. beginns right 1 goes next one.. have button now, shows me networktyp in textview. show 4g.. in advance help!

button start; textview ergebniss;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      start = (button)findviewbyid(r.id.start);     start.setonclicklistener(this);      ergebniss = (textview) findviewbyid(r.id.textview1);  }   public void getnetworkclass(context context) {     telephonymanager mtelephonymanager = (telephonymanager) context             .getsystemservice(context.telephony_service);     int networktype = mtelephonymanager.getnetworktype();     switch (networktype) {      case telephonymanager.network_type_gprs:     case telephonymanager.network_type_edge:     case telephonymanager.network_type_cdma:     case telephonymanager.network_type_1xrtt:     case telephonymanager.network_type_iden:     toast.maketext(getapplicationcontext(), "2g", toast.length_long).show();         ergebniss.settext("2g");       case telephonymanager.network_type_umts:     case telephonymanager.network_type_evdo_0:     case telephonymanager.network_type_evdo_a:     case telephonymanager.network_type_hsdpa:     case telephonymanager.network_type_hsupa:     case telephonymanager.network_type_hspa:     case telephonymanager.network_type_evdo_b:     case telephonymanager.network_type_ehrpd:     case telephonymanager.network_type_hspap:         toast.maketext(getapplicationcontext(), "3g", toast.length_long).show();         ergebniss.settext("3g");       case telephonymanager.network_type_lte:         toast.maketext(getapplicationcontext(), "4g", toast.length_long).show();         ergebniss.settext("4g");       }  }  @override public void onclick(view v) {     // todo auto-generated method stub     getnetworkclass(this); } 

}

you need @ least show toast.

toast.maketext(getapplicationcontext(), "2g", toast.length_long).show(); 

and you're missing break; (or return ..) statement after toast.maketext() calls.