login session

package com.example.lbstempatles;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;


public class Login extends Activity {


     EditText txtusername,txtpassword;
     String ip="";
     int sukses;
     private ProgressDialog pDialog;
        JSONParser jsonParser = new JSONParser();

        private static final String TAG_SUKSES = "sukses";
        private static final String TAG_record = "record";

        String kode_admin="",nama_admin,email;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        ip=jsonParser.getIP();


        txtusername=(EditText)findViewById(R.id.txtusername);
        txtpassword=(EditText)findViewById(R.id.txtpassword);


        Button btnLogin= (Button) findViewById(R.id.btnlogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String user=txtusername.getText().toString();
                String pass=txtpassword.getText().toString();
                if(user.length()<1){lengkapi("Username");}
                else if(pass.length()<1){lengkapi("Password");}
                else{
                    new ceklogin().execute();
                         }

                  }

        });


        TextView txtBuat=(TextView)findViewById(R.id.btnbantuan);
        txtBuat.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
            Intent i = new Intent(Login.this,Bantuan.class);
            startActivity(i);
        }});



        TextView txtLupa=(TextView)findViewById(R.id.btnkeluar);
        txtLupa.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
                finish();
        }});

    }
    public void gagal(){
        new AlertDialog.Builder(this)
                .setTitle("Gagal Login")
                .setMessage("Silakan Cek Account Anda Kembali")
                .setNeutralButton("Tutup", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dlg, int sumthin) {

                    }})
                .show();
    }

    public void sukses(String item,String ex){
        new AlertDialog.Builder(this)
                .setTitle("Sukses "+ex)
                .setMessage(ex+" data "+item+" Berhasil")
                .setNeutralButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dlg, int sumthin) {
//                        Intent i = new Intent(login.this,MainActivity.class);
//                        i.putExtra("xmlbio", xmlbio);
//                        startActivity(i);
                        // finish();
                    }})
                .show();
    }



    class ceklogin extends AsyncTask<String, String, String> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Login.this);
            pDialog.setMessage("Proses Login...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }
        protected String doInBackground(String... params) {

            try {
                String  username=txtusername.getText().toString().trim();
                String  password=txtpassword.getText().toString().trim();

                List<NameValuePair> myparams = new ArrayList<NameValuePair>();
                myparams.add(new BasicNameValuePair("username", username));
                myparams.add(new BasicNameValuePair("password", password));

                String url=ip+"admin/admin_login.php";
                Log.v("detail",url);
                JSONObject json = jsonParser.makeHttpRequest(url, "GET", myparams);
                Log.d("detail", json.toString());
                sukses = json.getInt(TAG_SUKSES);
                if (sukses == 1) {
                    JSONArray myObj = json.getJSONArray(TAG_record); // JSON Array
                    final JSONObject myJSON = myObj.getJSONObject(0);
                    runOnUiThread(new Runnable() {
                        public void run() {
                            try {

                                kode_admin=myJSON.getString("kode_admin");
                                nama_admin=myJSON.getString("nama_admin");
                                email=myJSON.getString("email");
                                    }
                            catch (JSONException e) {e.printStackTrace();}
                        }});
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }
        @SuppressLint("NewApi")
        protected void onPostExecute(String file_url) {

            pDialog.dismiss();
            Log.v("SUKSES",kode_admin);

            if(sukses==1){
                final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(Login.this);
                SharedPreferences.Editor editor = sharedPref.edit();
                editor.putBoolean("Registered", true);
                editor.putString("kode_admin", kode_admin);
                editor.putString("nama_admin", nama_admin);
                editor.putString("email", email);
                editor.apply();
                Intent i = new Intent(getApplicationContext(),Menu_admin.class);
                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(i);
                finish();
            }
            else{
                gagal("Login");
            }
        }
    }



        public void lengkapi(String item){
            new AlertDialog.Builder(this)
            .setTitle("Lengkapi Data")
            .setMessage("Silakan lengkapi data "+item)
            .setNeutralButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dlg, int sumthin) {
                }})
            .show();
        }



      public void gagal(String item){
            new AlertDialog.Builder(this)
            .setTitle("Gagal Login")
            .setMessage("Login "+item+" ,, Gagal")
            .setNeutralButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dlg, int sumthin) {
                }})
            .show();
        }


      public boolean onKeyDown(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                finish();
                    return true;
            }
        return super.onKeyDown(keyCode, event);
    }

    }

+++++++++++++++++++++++++
Ambil session :

  SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(customer.this);
   Boolean Registered = sharedPref.getBoolean("Registered", false);
         if (!Registered){
             finish();
         }else {
          kode_admin= sharedPref.getString("kode_admin", "");
          nama_admin = sharedPref.getString("nama_admin", "");
         }