android - 如何在android中清空 Volley 请求队列

Question

private void setupNotificationListener(){

    StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
        @Override
        public void onResponse(String s) {
            flag=1;
            //System.out.println(flag);
            Map<String,Object> mapPost, mapContent;
            Map<String,Object> mapTitle;

            gson = new Gson();
            list = (List) gson.fromJson(s, List.class);
            postTitle = new String();
            postContent=new String();


            System.out.println("shiv class:"+list.size());
            mapPost = (Map<String, Object>) list.get(0);
            mapTitle = (Map<String, Object>) mapPost.get("title");
            postTitle = (String) mapTitle.get("rendered");
            mapContent = (Map<String, Object>) mapPost.get("content");
            postContent = (String) mapContent.get("rendered");

            if(!alreadyNotified(postTitle)){
                Log.d("not notified","");
                createNotif(postContent,postTitle);
                saveNotificationKey(postTitle);
            }else{
                System.out.print("already notified");
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError volleyError) {
            Log.d("Error","Error");
        }
    });

    rQueue = Volley.newRequestQueue(NotifierService.this);
    rQueue.add(request);

    NotifierService.getInstance().getRequestQueue().getCache().clear();
}

这是我发送 volley 请求并从 url 解析 json 的整个函数。
现在我想在不增加请求队列的情况下每分钟获取一次 json。
有没有办法清空请求队列？？

Answer 1

如果您想在发生错误时立即取消所有请求:

StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
    @Override
    public void onResponse(String s) {
        //....
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError volleyError) {
        //....
        mRequestQueue.cancelAll(new RequestQueue.RequestFilter() {
             @Override
             public boolean apply(Request<?> request) {
                 return true;
             }
        });
    }
});

如果您想在离开 Activity 后立即取消所有请求，请将取消代码放入您的 onStop 方法中。您应该这样做，否则您将在一个可能已经完成的 Activity 中进行操作，并且在作业执行期间可能会造成内存泄漏