android - how to navigate back to login page after successful register -

  @override     public void onclick(view v) {          if(v == buttonregister){             registeruser();           }      } private void registeruser() {     ?*some code here*/    } private void register(string name, string email, string password, string phone ) {     string urlsuffix = "?name="+name+"&email="+email+"&password="+password+"&phone="+phone;     class registeruser extends asynctask<string, void, string> {         progressdialog loading;         @override         protected void onpreexecute() {             super.onpreexecute();             loading = progressdialog.show(signupactivity.this, "please wait",null, true, true);         }         @override         protected void onpostexecute(string s) {             super.onpostexecute(s);             loading.dismiss();             toast.maketext(getapplicationcontext(), s, toast.length_short).show();           }          @override         protected string doinbackground(string... params) {             string s = params[0];             bufferedreader bufferedreader = null;             try {                 url url = new url(register_url+s);                 httpurlconnection con = (httpurlconnection) url.openconnection();                 bufferedreader = new bufferedreader(new inputstreamreader(con.getinputstream()));                  string result;                  result = bufferedreader.readline();                  return result;             }catch(exception e){                 return null;             }         }     }      registeruser ru = new registeruser();     ru.execute(urlsuffix); } 

if moved login activity screen can use:   @override         protected void onpostexecute(string s) {             super.onpostexecute(s);             loading.dismiss();             toast.maketext(getapplicationcontext(), s, toast.length_short).show();             this.finish();           }   otherwise can start new activity :  @override         protected void onpostexecute(string s) {             super.onpostexecute(s);             loading.dismiss();             toast.maketext(getapplicationcontext(), s, toast.length_short).show();             startactivity(new intent(signupactivity.this,loginactivity.class));             this.finish();          }