如何禁用Volley请求重试？

Question

我将JsonRequest发布到服务器.服务器很慢.Volley倾向于多次调用慢速服务器,因为它没有得到第一个请求的响应(因为我的服务器很慢).有没有办法禁止Volley重试请求,以便它可以收到第一个响应？

我试过了:

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

我已经替换了TIMEOUT_MS = 0,RETRIES = 0,甚至BACKOFF_MULT = 0,但它不起作用.

还有其他建议吗？

Answer 1

排球默认重试政策是:

/** 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;

你可以在DefaultRetryPolicy.java中找到它,

所以你可以看到默认情况下凌空发出1次重试请求.

尝试使用较小的TIMEOUT(如果你不想等待2500ms),或者大于2500ms来获得答案),但保留其他值,例如:

// 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));

Answer 2

试试这个,

// 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));

方法调用表单任务

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();
    }

}