php - Connecting database to android using json -

as new application development using json connect database using php having error following code:

public class mainactivity extends activity {      edittext etemail, etpass;     button login, register;     textview terror;     progressdialog pdialog;     //textview ptodoc;      private static string key_success = "success";     //private static string key_error = "error";     private static final string key_referred_as = "referred_as";     private static final string key_email = "email";     private static final string key_card = "card";     private static final string key_address = "address";     private static final string key_contact_no = "contact_no";     private static final string key_id = "id";     private static final string key_dateofbirth = "dateofbirth";       @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         // setting default screen sign_in.xml         setcontentview(r.layout.activity_main);          etemail = (edittext) findviewbyid(r.id.emailaddress);         etpass = (edittext) findviewbyid(r.id.password);         terror = (textview) findviewbyid(r.id.error);         login = (button) findviewbyid(r.id.login);         register = (button) findviewbyid(r.id.reg);           login.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view){                  string email = etemail.gettext().tostring();                 string password = etpass.gettext().tostring();                 userfunctions userfunction = new userfunctions();                 log.d("button", "login");                 jsonobject json = userfunction.loginuser(email, password);                  try {                    if (json.getstring(key_success) == null) {                         terror.settext("");                         string res = json.getstring(key_success);                         if(integer.parseint(res) == 1){                             // user logged in                             // store user details in sqlite database                             databasehandler db = new databasehandler(getapplicationcontext());                             jsonobject json_user = json.getjsonobject("user");                              // clear previous data in database                             userfunction.logoutuser(getapplicationcontext());                             db.adduser(json_user.getstring(key_referred_as),json_user.getstring(key_email),json_user.getstring(key_card),                                     json_user.getstring(key_dateofbirth),json_user.getstring(key_address),                                    json_user.getstring(key_contact_no),json_user.getstring(key_id));                             // launch dashboard screen                             intent dashboard = new intent(getapplicationcontext(), home.class);                              // close views before launching dashboard                             dashboard.addflags(intent.flag_activity_clear_top);                             startactivity(dashboard);                              // close login screen                             finish();                        }else{                             // error in login                             terror.settext("incorrect username/password");                        }                     }                 } catch (jsonexception e) {                     e.printstacktrace();                 }             }         });          register.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                 intent = new intent(getapplicationcontext(),register.class);                 startactivity(i);              }         });       }    } 

on click event of login button email , password , add jsonobject , pass asyn class send particular weblink related code follows:

class sendasyn extends asynctask<jsonobject, jsonobject, jsonobject> { string url = "http://yourweblink.com/yourdbfile.php"; boolean repeat=true;  @override protected jsonobject doinbackground(jsonobject... params) {     // todo auto-generated method stub       jsonobject json = params[0];     httpclient client = new defaulthttpclient();     httpconnectionparams.setconnectiontimeout(client.getparams(), 100000);     string resfromserver="null";     jsonobject jsonresponse = null;     httppost post = new httppost(url);     try {         stringentity se = new stringentity("regis=" + json.tostring());         post.addheader("content-type", "application/x-www-form-urlencoded");         post.setentity(se);          httpresponse response;         log.i("url",post.getparams().tostring());         response = client.execute(post);         resfromserver = org.apache.http.util.entityutils                 .tostring(response.getentity());          if(resfromserver.trim().equals("successfull")){             loginactivity.suc=true;             loginactivity.error=false;             log.i("here are","successfull"+resfromserver);         }else{             string[] tokens=resfromserver.split("~");             log.i("here else",resfromserver);             if(tokens[0].equals("error")){                 log.i("here error",tokens[1]);                 loginactivity.error=true;                 loginactivity.suc=false;             }         }      //log.i("response", resfromserver);     } catch (exception e) {         e.printstacktrace();     }       return jsonresponse; } 

}

and call class using

 sendasyn transmitter = new sendasyn();  transmitter.execute(new jsonobject[]{your jsonobject});