Session management in Android

Login activity

private void storeLoginInfo(String id, String comp_name, String pincode, String mobile, String email, String contact) {

    getSharedPreferences("PREFERENCE", MODE_PRIVATE)
            .edit()
            .putString("id", id)
            .putString("comp_name", comp_name)
            .putString("pincode", pincode)
            .putString("mobile", mobile)
            .putString("email", email)
            .putString("contact", contact)
            .commit();

    Session_data.id=id;
    Session_data.comp_name = comp_name;
    Session_data.pincode = pincode;
    Session_data.mobile = mobile;
    Session_data.email = email;
    Session_data.contact = contact;
}

Login Checking 

  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        Session_data.id=getSharedPreferences("PREFERENCE", MODE_PRIVATE).getString("id", "null");
        Session_data.comp_name = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getString("comp_name", "null");
        Session_data.pincode = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getString("pincode", "null");
        Session_data.mobile = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getString("mobile", "null");
        Session_data.email = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getString("email", "null");
        Session_data.contact = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getString("contact", "null");

        Log.d("mob   >>> "+Session_data.id,"mob"+Session_data.contact);
if(Session_data.mobile.equals("null")){
    init();

}else {
    Intent intmap = new Intent(LoginActivity.this, GpsTrackerActivity.class);
    startActivity(intmap);
}
        initweb();

    }







Session Data


package com.veer.myapplication.Utils;

import android.content.Context;
import android.content.Intent;


/** * Created by aabit on 7/20/16. */public class Session_data {
    public static String id = "null";
    public static String comp_name = "null";
    public static String pincode = "null";
    public static String mobile = "null";
    public static String email = "null";
    public static String contact = "null";

    public Session_data() {
    }

    public static void logOutUser(Context context) {

            context.getSharedPreferences("PREFERENCE", context.MODE_PRIVATE)
                    .edit()
                    .putString("id", id)
                    .putString("comp_name", comp_name)
                    .putString("pincode", pincode)
                    .putString("mobile", mobile)
                    .putString("email", email)
                    .putString("contact", contact)
                    .commit();


            Session_data.id = "null";
            Session_data.comp_name = "null";
            Session_data.pincode = "null";
            Session_data.mobile = "null";
            Session_data.email = "null";
            Session_data.contact = "null";

            context.startActivity(new Intent(context, com.veer.myapplication.LoginActivity.class));
        }
    }