取消进度对话框时取消AsyncHttpClient请求Android

我正在从我的android应用程序向服务器发出请求，我正在使用loopj的AsyncHttpClient库来执行此操作。如果进度对话框被取消（按下返回键），我试图取消一个请求，但实际发生的是，ProgressDialog被取消，但请求在后台继续工作，当它完成时，它将带我进入另一个活动（这很好，因为当进度对话框没有被取消时，这是我想要的行为）。

以下是我的部分代码，我在其中设置ProgressDialog的setOnCancelListener：（客户端是AsyncHttpClient的实例）

public static void login(final String email, final String password,
            final Context context, final Context appContext, final Resources res) {
        prgDialog = new ProgressDialog(context);
        prgDialog.setMessage(res.getString(R.string.dialog_please_wait));
        prgDialog.setCancelable(true);
        prgDialog.show();
        prgDialog.setOnCancelListener(new OnCancelListener() {
            @Override
            public void onCancel(DialogInterface dialog) {
                client.cancelRequests(context, true);
            }
        });
        cookieStore = new PersistentCookieStore(appContext);
        client.setCookieStore(cookieStore);
        RequestParams params = new RequestParams();
        params.put("user_session[email]", email);
        params.put("user_session[password]", password);
        client.addHeader("Accept", HEADER);
        client.post(getAbsoluteUrl(LOGIN_PATH), params,
                new JsonHttpResponseHandler() {
                    @Override
                    public void onFailure(int statusCode,
                            org.apache.http.Header[] headers,
                            java.lang.String responseString,
                            java.lang.Throwable throwable) {
                        prgDialog.hide();
                        if (statusCode == 404) {
                            Toast.makeText(context,
                                    res.getString(R.string.error_404),
                                    Toast.LENGTH_LONG).show();
                        } else if (statusCode == 500) {
                            Toast.makeText(context,
                                    res.getString(R.string.error_500),
                                    Toast.LENGTH_LONG).show();
                        } else if (statusCode == 401) {
                            Toast.makeText(context,
                                    res.getString(R.string.login_401),
                                    Toast.LENGTH_LONG).show();
                        } else {
                            Toast.makeText(
                                    context,
                                    "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]",
                                    Toast.LENGTH_LONG).show();
                        }
                    }
                    @Override
                    public void onSuccess(int statusCode, Header[] headers,
                            JSONObject response) {
                        if (statusCode == 200) {
                //do something
                    }
                });
    }

client.post(context,getAbsoluteUrl(LOGIN_PATH), params,
            new JsonHttpResponseHandler();

client.cancelAllRequests(true);

client.post(context, apiName, stringEntity, "text/plain",
                    uploadResponseHandler(callBack, apiNumber, requestId, context, resultClass)).setTag("uploadFile");

    client.cancelRequestsByTAG("uploadFile",true);