php - Android Volley - BasicNetwork.performRequest: Unexpected response code 400 -


problem: when click register button, show blank toast , didnt insert data on online database webserver.

old code on onerrorresponse:

public void onerrorresponse(volleyerror error) {          progressdialog.hide();                  toast.maketext(getapplicationcontext(),error.getmessage(), toast.length_long).show();  }

searched solution:

android volley - basicnetwork.performrequest: unexpected response code 400

new problem: stuck in "registering user ..." when add data , clicked register button.

logcat errors:

e/volley: [166] basicnetwork.performrequest: unexpected response code 400 *htt://hosturl.com* registeruser.php

and 

e/surface: getslotfrombufferlocked: unknown buffer: 0xa2565120

source code: 

package com.chishingwan.loginregister;  import android.app.progressdialog; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.toast;  import com.android.volley.authfailureerror; import com.android.volley.networkresponse; import com.android.volley.request; import com.android.volley.requestqueue; import com.android.volley.response; import com.android.volley.servererror; import com.android.volley.volleyerror; import com.android.volley.toolbox.httpheaderparser; import com.android.volley.toolbox.stringrequest; import com.android.volley.toolbox.volley;  import org.json.jsonexception; import org.json.jsonobject;  import java.io.unsupportedencodingexception; import java.util.hashmap; import java.util.map;  public class registeractivity extends appcompatactivity implements view.onclicklistener {      private edittext etfirstname, etlastname, etaddress, etcontactnumber, etemail, etpassword;     private button bregister;     private progressdialog progressdialog;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_register);          etfirstname = (edittext) findviewbyid(r.id.etfirstname);         etlastname = (edittext) findviewbyid(r.id.etlastname);         etaddress = (edittext) findviewbyid(r.id.etaddress);         etcontactnumber = (edittext) findviewbyid(r.id.etcontactnumber);         etemail = (edittext) findviewbyid(r.id.etemail);         etpassword = (edittext) findviewbyid(r.id.etpassword);         bregister = (button) findviewbyid(r.id.bregister);         progressdialog = new progressdialog(this);          bregister.setonclicklistener(this);      }      private void registeruser(){         final string firstname = etfirstname.gettext().tostring().trim();         final string lastname = etlastname.gettext().tostring().trim();         final string contactnumber = etcontactnumber.gettext().tostring().trim();         final string address = etaddress.gettext().tostring().trim();         final string email = etemail.gettext().tostring().trim();         final string password = etpassword.gettext().tostring().trim();          progressdialog.setmessage("registering user ... ");         progressdialog.show();          stringrequest stringrequest = new stringrequest(request.method.post, constants.url_register,                 new response.listener<string>() {                     @override                     public void onresponse(string response) {                         progressdialog.dismiss();                          try{                             jsonobject jsonobject = new jsonobject(response);                             toast.maketext(getapplicationcontext(), jsonobject.getstring("message"), toast.length_long).show();                         }catch(jsonexception e){                             e.printstacktrace();                         }                     }                 },                 new response.errorlistener() {                     @override                     public void onerrorresponse(volleyerror error) {                         networkresponse response = error.networkresponse;                         if (error instanceof servererror && response != null) {                             try {                                 string res = new string(response.data,                                         httpheaderparser.parsecharset(response.headers, "utf-8"));                                 // can use deserializer make sense of data                                 jsonobject obj = new jsonobject(res);                             } catch (unsupportedencodingexception e1) {                                 // couldn't decode data string                                 e1.printstacktrace();                             } catch (jsonexception e2) {                                 // returned data not jsonobject?                                 e2.printstacktrace();                             }                         }                     }                 }){             @override             protected map<string, string> getpostparams() throws authfailureerror {                 map<string, string> params = new hashmap<>();                 params.put("firstname", firstname);                 params.put("lastname", lastname);                 params.put("address", address);                 params.put("contactnumber", contactnumber);                 params.put("email", email);                 params.put("password", password);                  return params;             }         };         requestqueue requestqueue = volley.newrequestqueue(this);         requestqueue.add(stringrequest);     }      @override     public void onclick(view view) {          if(view==bregister){             registeruser();         }     } }

you forgot add header stringrequest:

@override public map<string, string> getheaders() throws authfailureerror {     map<string, string> header = new linkedhashmap<string, string>();     header.put("content-type", "application/x-www-form-urlencoded");     return super.getheaders(); }

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