On Andriod, I'm trying to change the framework from AsyncHttpClient to Volley. There's a call back method onStart in AsyncHttpClient which helps me do something before I receive the response from the server. (Such as notifying the user to wait.)
I'd like to implement this functionality by Volley, but I didn't find a similar call back to implement. Can someone help me out? Thanks!
In Volley there are two types of callbacks:
/** Callback interface for delivering parsed responses. */
public interface Listener<T> {
/** Called when a response is received. */
public void onResponse(T response);
}
/** Callback interface for delivering error responses. */
public interface ErrorListener {
/**
* Callback method that an error has been occurred with the
* provided error code and optional user-readable message.
*/
public void onErrorResponse(VolleyError error);
}
There is no AsyncHttpClient onStart callback equivalent.
Example:
String url = "http://stackoverflow.com";
StringRequest request = new StringRequest(url, new Listener<String>() {
@Override
public void onResponse(String response) {
// handle response
}
}, new ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// handle error
}
});
RequestQueue requestQueue = Volley.newRequestQueue(context);
request.setTag(TAG); // you can add tag to request
requestQueue.add(request); // add request to queue
requestQueue.cancelAll(TAG); // you can cancel request using tag
