How to disable Volley request from retrying?

问题:

I post a JsonRequest to a server. The server is slow. Volley tends to make multiple calls to the slow server because it didn't get a response from the first request (since my server is slow). Is there any way to disable Volley from retrying a request so that it can receive the first response?

I have tried:

myRequest.setRetryPolicy(new DefaultRetryPolicy(
                TIMEOUT_MS, 
                RETRIES, 
                BACKOFF_MULT)); 

I have replaced TIMEOUT_MS = 0, RETRIES = 0, and even BACKOFF_MULT = 0, but it doesn't work.

Any other suggestions?

回答1:

The Volley Default Retry Policy is:

/** The default socket timeout in milliseconds */
public static final int DEFAULT_TIMEOUT_MS = 2500;

/** The default number of retries */
public static final int DEFAULT_MAX_RETRIES = 1;

/** The default backoff multiplier */
public static final float DEFAULT_BACKOFF_MULT = 1f;

You can find it in DefaultRetryPolicy.java,

so you can see that volley makes 1 retry request by default.

Try to use smaller TIMEOUT (if you don't want to wait the 2500ms), or bigger than 2500ms to get the answer), but keep the other values, for example:

// Wait 20 seconds and don't retry more than once
myRequest.setRetryPolicy(new DefaultRetryPolicy(
       (int) TimeUnit.SECONDS.toMillis(20),
       DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
       DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

回答2:

Try this,

// remove caching
        jsObjRequest.setShouldCache(false);
        // Wait 30 seconds and don't retry more than once
        jsObjRequest.setRetryPolicy(new DefaultRetryPolicy(0, 0,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

Method call form task

public void callWebService(JSONObject jsonRequest) {

    JsonObjectRequest jsObjRequest = new JsonObjectRequest(
            Request.Method.POST, url + pageurl, jsonRequest,
            new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject jsonObject) {
                    sendResponse(jsonObject);

                }
            }, new Response.ErrorListener() {

                @Override
                public void onErrorResponse(VolleyError error) {

                    callBack.onError(error);
                    try {
                        if (progressDialog != null) {
                            progressDialog.dismiss();
                            progressDialog = null;
                        }
                    } catch (Exception e) {
                        Helper.customPrintStackTrace(e);
                    }

                }
            }

    ) {

        @Override
        public String getBodyContentType() {
            return "application/json; charset=utf-8";
        }

        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {

            Map<String, String> params = new HashMap<String, String>();

            params.put(WebConfig.WebParams.APIKEY, Helper
                    .getStringValuefromPrefs(context,
                            SharedPreferencesKey.PREF_APIKEY));
            params.put(WebConfig.WebParams.APITOKEN, Helper
                    .getStringValuefromPrefs(context,
                            SharedPreferencesKey.PREF_APITOKEN));

            if (!Helper.getStringValuefromPrefs(context,
                    SharedPreferencesKey.PREF_USERID).equals("")) {

                params.put(WebConfig.WebParams.USER_ID, Helper
                        .getStringValuefromPrefs(context,
                                SharedPreferencesKey.PREF_USERID));

            } else {
                params.put(WebConfig.WebParams.USER_ID, "0");
            }

            return params;
        }

    };

    // remove caching
    jsObjRequest.setShouldCache(false);
    // Wait 30 seconds and don't retry more than once
    jsObjRequest.setRetryPolicy(new DefaultRetryPolicy(0, 0,
            DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    // Access the RequestQueue through your singleton class.
    VolleySingleton.getInstance(context).addToRequestQueue(jsObjRequest);

    if (showDefultProcess) {

        progressDialog.show();
    }

}

回答3:

To stop Volley from retrying a request, simply set the retry policy of the request to a DefaultRetryPolicy with maxNumRetries being 0:

myRequest.setRetryPolicy(new DefaultRetryPolicy(
    DefaultRetryPolicy.DEFAULT_TIMEOUT_MS,
    0,  // maxNumRetries = 0 means no retry
    DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

回答4:

Using your StringRequest Object or JsonObjectRequest Object or JsonArrayRequest Object call this method.

For example if the object is an instance of StringRequest, here is the method:

stringRequest.setRetryPolicy(new DefaultRetryPolicy(initialTimeoutMs, maxNumRetries,
               backoffMultiplier ));

initialTimeoutMs The initial timeout for the policy.

maxNumRetries The maximum number of retries.

backoffMultiplier Backoff multiplier for the policy.

Below are the parameters which I gave.

stringRequest.setRetryPolicy(new DefaultRetryPolicy(10 * 1000, 0,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

First parameter says set InitialTimeout to 10 seconds.

Second parameter says set retry count tries to 0.

Third parameter is default.