private void login(String username, String password) {
String url="http://linkapi.com/auth/android?username="+username+"&password="+password;
                StringRequest jar = new StringRequest(Request.Method.GET,url,new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        if (response.startsWith("sukses")) {
                            Toast.makeText(getActivity().getApplicationContext(), "Success", Toast.LENGTH_SHORT).show();
                        }
                        else if (response.equals("gagal")) {
                            Toast.makeText(getActivity().getApplicationContext(), "Username or Password incorrect", Toast.LENGTH_SHORT).show();
                        }
                        else {
                            Toast.makeText(getActivity().getApplicationContext(), "Something wrong, please try again", Toast.LENGTH_SHORT).show();
                        }
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(getActivity().getApplicationContext(), "Something wrong, please try again.", Toast.LENGTH_SHORT).show();
                    }
                });
                AppController.getInstance().addToRequestQueue(jar);
}