NullPointerException addToRequestQueue(com.android.volley.Request, java.lang.String)' on a null object reference

Question

I\'m using AndroidHive register login and it\'s working fine in example project of this login-register.

But after many attempts trying it with CardViews

Answer 1

You didn't pass any data to the volley method, that means it get null data (empty data)..... see example:

protected Map getParams() throws AuthFailureError {
                Map map=new HashMap<>();
                map.put(region, regionName);
                return map;
            }

if regionName is empty it will give you NullPointerException, so regionName must have something.....