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

In my case, I forgot to initialize the variable rq, please, make sure you did it

    ...
    private RequestQueue rq;   // rq = null (NullPointerException if you use it)
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        rq = Volley.newRequestQueue(YourActivity.this);  // rq != null
    }
    ...
    rq.add(request);