TokenRequest.java

final class TokenRequest extends StringRequest {
	TokenRequest(int method, String url, Listener<String> listener, 
			ErrorListener errorListener) {
		super(method, url, listener, errorListener);
	}

	@Override
	protected Map<String, String> getParams() throws AuthFailureError {
		Map<String, String> params = new HashMap<String, String>();
		params.put("grant_type", "client_credentials");
		return params;
	}

	@Override
	public Map<String, String> getHeaders() throws AuthFailureError {
		Map<String, String> headers = new HashMap<String, String>();
		String auth = "Basic "
				+ Base64.encodeToString((TwitterValues.CONSUMER_KEY 
				+ ":" + TwitterValues.CONSUMER_SECRET).getBytes(),
						Base64.NO_WRAP);
		headers.put("Authorization", auth);
		return headers;
	}
}