How to set a toast to java.net.UnknownHostException in android -


in emulator, error when internet connection turned off:

java.net.unknownhostexception: unable resolve host "url"; no address associated hostname.

but want show toast instead of revealing hosting url upon onclick of login button prevent security issues. please :)

public class newloginactivity extends appcompatactivity implements view.onclicklistener {   private edittext edittextusername, edittextpassword;   private button buttonlogin;   private progressdialog progressdialog;    @override   protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.new_login);       if (sharedprefmanager.getinstance(this).isloggedin()) {       finish();       startactivity(new intent(this, admingmenuactivity.class));       return;     }      edittextusername = (edittext)findviewbyid(r.id.edittextusername);     edittextpassword = (edittext)findviewbyid(r.id.edittextpassword);     buttonlogin = (button)findviewbyid(r.id.buttonlogin);      progressdialog = new progressdialog(this);     progressdialog.setmessage("please wait...");      buttonlogin.setonclicklistener(this);   }    private void userlogin() {     final string username = edittextusername.gettext().tostring().trim();     final string password = edittextpassword.gettext().tostring().trim();      progressdialog.show();      stringrequest stringrequest = new stringrequest(       request.method.post,       constants.url_login,       new response.listener<string>() {         @override         public void onresponse(string response) {           progressdialog.dismiss();             try {             jsonobject obj = new jsonobject(response);             if (!obj.getboolean("error")) {               sharedprefmanager.getinstance(getapplicationcontext())                 .userlogin(                   obj.getint("id"),                   obj.getstring("username"),                   obj.getstring("email")                 );               startactivity(new intent(getapplicationcontext(), admingmenuactivity.class));               finish();             }             else {               toast.maketext(                 getapplicationcontext(),                 obj.getstring("message"),                 toast.length_long               ).show();             }           }            catch (jsonexception e) {             e.printstacktrace();           }         }       },       new response.errorlistener() {         @override         public void onerrorresponse(volleyerror error) {           progressdialog.dismiss();            toast.maketext(             getapplicationcontext(),             error.getmessage(),             toast.length_long           ).show();         }       }     ) {       @override       protected map<string, string> getparams() throws authfailureerror {         map<string, string> params = new hashmap<>();         params.put("username", username);         params.put("password", password);         return params;       }     };      requesthandler.getinstance(this).addtorequestqueue(stringrequest);   }     @override   public void onclick(view view) {      if (view == buttonlogin) {       userlogin();     }   } }

use try-catch block catch exception

try {     //your code login goes here.... } catch (unknownhostexception e) {     toast.maketext(getapplicationcontext(), "unable connect!", toast.length_short).show(); }

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