java - AsyncTask not updating UI after doInBackground finishes -

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i'm trying make simple app that's looks wifi networks, , connects them. i'm having problem updating ui.

a few pointers great. thank time.

class uiupdater extends asynctask<void, void, list<scanresult>> {      @override     protected void onpreexecute() {         super.onpreexecute();          textview searching = (textview) findviewbyid(r.id.searching);         searching.settext("currently searching...");     }      @override     protected list<scanresult> doinbackground(void... params) {         wifimanager manager = (wifimanager) client.this.getsystemservice(context.wifi_service);          if (!manager.iswifienabled())             manager.setwifienabled(true);          return manager.getscanresults();     }      @override     protected void onpostexecute(list<scanresult> items) {         super.onpostexecute(items);          arraylist<items> wifi = new arraylist<>();          (scanresult s : items)             wifi.add(new items(s.ssid, s.capabilities));          ///textview searching = (textview) findviewbyid(r.id.searching);         ///searching.settext("");          listview list = (listview) findviewbyid(r.id.list);         explorer adapter = new explorer(client.this, r.layout.listview_item_row, wifi);          list.setadapter(adapter);          clicklistener(list, wifi);     }  }

please use toast message or logcat or breakpoint check onpost execute being called or not


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