Remove password and connect with new password wifi android -

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i ask help, code : 

    protected void onactivityresult(int requestcode, int resultcode, intent data) {     if(requestcode==request_code_input){         switch (resultcode){             case result_code_pass:                 connectivitymanager connectivitymanager = (connectivitymanager) getsystemservice(context.connectivity_service);                 networkinfo networkinfo=connectivitymanager.getnetworkinfo(connectivitymanager.type_wifi);                 wifimanager wifimanager= (wifimanager) getsystemservice(context.wifi_service);                 pass=data.getstringextra("password");                 namewifi=data.getstringextra("namewifi");                 wificonfiguration conf=new wificonfiguration();                 conf.allowedkeymanagement.set(wificonfiguration.keymgmt.none);                 list<scanresult> networklist=wifimanager.getscanresults();                 if(networklist !=null){                     for(scanresult network : networklist){                         if(network.ssid.startswith("\"")){                             network.ssid=network.ssid.substring(1, network.ssid.length() - 1);                         }                         if(namewifi.equals(network.ssid)){                             string capabilities=network.capabilities;                             if(capabilities.contains("wpa2")){                                 conf.presharedkey="\""+pass+"\"";                             }else if(capabilities.contains("wep")){                                 conf.wepkeys[0]="\""+pass+"\"";                                 conf.weptxkeyindex=0;                                 conf.allowedgroupciphers.set(wificonfiguration.groupcipher.wep40);                             }                             break;                         }                     }                 }                  wifimanager.addnetwork(conf);                 list<wificonfiguration> list=wifimanager.getconfigurednetworks();                 for(wificonfiguration i: list){                     if(i.ssid!=null && i.ssid.equals("\""+namewifi+"\"")){                         wifimanager.disconnect();                         showwaiting();                         wifimanager.enablenetwork(i.networkid, true);                         wifimanager.reconnect();                         if(networkinfo.isconnected()){                             dismisswaiting();                         }else{                             alertdialog.builder alert=new alertdialog.builder(mainactivity.this);                             alert.settitle("wrong password")                                     .setmessage("please try again")                                     .setpositivebutton(android.r.string.yes, new dialoginterface.onclicklistener() {                                         @override                                         public void onclick(dialoginterface dialog, int which) {                                             dialog.dismiss();                                         }                                     });                             alert.create().show();                         }                     }                 }                 break;         }     } }

i have 2 activities (mainactivity , sharewifi), create sharewifi purpose: users input wifi ssid , password press enter, both of them send mainactivity--> disable current wifi , reconnect new password still uses old password reconnect. write code follow link : how connect specific wi-fi network in android programmatically?
please me resolve problem. thank much.

resolved: add saveconfiguration , works

                wifimanager.addnetwork(conf);                 wifimanager.saveconfiguration();

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