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Adding custom headers to your requests e.g. for basic auth

suggest change

If you need to add custom headers to your volley requests, you can’t do this after initialisation, as the headers are saved in a private variable.

Instead, you need to override the getHeaders() method of Request.class as such: 

new JsonObjectRequest(REQUEST_METHOD, REQUEST_URL, REQUEST_BODY, RESP_LISTENER, ERR_LISTENER) {
    @Override
    public Map<String, String> getHeaders() throws AuthFailureError {
        HashMap<String, String> customHeaders = new Hashmap<>();

        customHeaders.put("KEY_0", "VALUE_0");
        ...
        customHeaders.put("KEY_N", "VALUE_N");

        return customHeaders;
    }
};

Explanation of the parameters:

If you want to build a custom request, you can add the headers in it as well: 

public class MyCustomRequest extends Request {
    ...
    @Override
    public Map<String, String> getHeaders() throws AuthFailureError {
        HashMap<String, String> customHeaders = new Hashmap<>();

        customHeaders.put("KEY_0", "VALUE_0");
        ...
        customHeaders.put("KEY_N", "VALUE_N");

        return customHeaders;
    }
    ...
}
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Volley:
* Volley
* Using Volley for HTTP requests
* Basic StringRequest using GET method
* Adding custom design time attributes to NetworkImageView
* Request JSON
* Adding custom headers to your requests e.g. for basic auth
* Remote server authentication using StringRequest through POST method
* Cancel a request
* Helper Class for Handling Volley Errors
* Boolean variable response from server with json request in volley
* Use JSONArray as request body
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