if statement - Programe Not Executing in Correct Order in Android Studio -

i want check whether email id entered user unique or not have variable boolean valid = false;. on clicking button taking email id entered , checking valid email id expression using regular expression , using asyntask check uniqueness. code in onclicklistner is

if (emailid.matches(regexp) && emailid.length() > 0) { new validate().execute(); toast.maketext(getapplicationcontext(), valid.tostring(), toast.length_long).show(); if (valid) { data.putstring("eid", eid); data.putstring("firstname", firstname); data.putstring("lastname", lastname); data.putstring("emailid", emailid); intent = new intent(getapplicationcontext(), gamesfragment.class); startactivity(i); } else { toast.maketext(getapplicationcontext(), "email address exist", toast.length_long).show(); } } else { toast.maketext(getapplicationcontext(), "check email address", toast.length_long).show(); }

here problem facing is, first time when entering email unique , clicks button, validate() asynctask checks , sets valid variable true, doesn't goes next activity gamesfragment because have declared valid = false initially. when again click button, goes next activity valid variable set true because of previous click. validate() asynctask

private class validate extends asynctask&lt;void, void, void&gt; {         @override         protected boolean doinbackground(void... params) {             arraylist<namevaluepair> emailid = new arraylist<namevaluepair>();             emailid.add(new basicnamevaluepair("email", emailid));              try {                 httpclient httpclient = new defaulthttpclient();                 httppost httppost = new httppost("url/validate.php");                 httppost.setentity(new urlencodedformentity(emailid));                 httpresponse response = httpclient.execute(httppost);                 httpentity entity = response.getentity();                 iss = entity.getcontent();              } catch(exception e) {                 log.e("pass 1", "connection error");                 e.printstacktrace();             }              try {                 bufferedreader reader = new bufferedreader                         (new inputstreamreader(iss,"iso-8859-1"),8);                 stringbuilder sb = new stringbuilder();                 while ((line = reader.readline()) != null)                     sb.append(line + "\n");                 iss.close();                 result = sb.tostring();             } catch(exception e) {                 e.printstacktrace();             }              try {                 jsonobject json_data = new jsonobject(result);                 code=(json_data.getint("code"));                  if(code == 1)                     valid = true;                 else                     valid = false;                 log.e("pass 3", "valid "+valid);             } catch(exception e) {                 e.printstacktrace();             }               return null;         }     } 

please not getting why happening.

create function check validation.

private boolean function validate(string emailid){  if (emailid.matches(regexp) && emailid.length() > 0) { return true; }   return false;  } 

use function decide event

if(validate(emailid)){ // if function return true email valid , go.   new validate().execute();   } 

for second condition have check in async task onpostexecute() validate();

 @override     protected void onpostexecute(object o) {          super.onpostexecute(o);         if(code == 1){      // check if response valid  intent = new intent(getapplicationcontext(), gamesfragment.class);                         startactivity(i); 

} }