从 android 服务创建实时通知 [英] Creating a real time notification from android service

问题描述

我正在创建一个应用程序，它会在我在 wordpress 网站上发布新帖子时立即显示通知.

I am creating an application which shows the notification as soon as I post a new post on wordpress site.

现在，只要我在 wordpress 网站上发帖，就会生成通知.

Now the notification is generated as soon as I put a post on the wordpress site.

但在 40-45 分钟后，应用程序崩溃并在后台被杀死，并出现以下错误:-

But after 40-45 minutes the app gets crashed and gets killed in the background with the following error:-

应用崩溃后显示的错误

我尝试了很多解决方案都没有奏效.
我不想将 firebase 用于通知.

I have tried many solutions none of it worked.
I don't want to use firebase for the notification.

我必须从 wordpress 实时获取数据，然后创建通知.

I have to fetch the data in real time from the wordpress and then create the notification.

这是用于生成通知的以下代码:-

This is the following code for generating the notification:-

private void setupNotificationListener(){

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

            System.out.println("shiv class:"+list.size());
            for(int i=0;i<list.size();++i) {
                mapPost = (Map<String, Object>) list.get(i);
                mapTitle = (Map<String, Object>) mapPost.get("title");
                postTitle[i] = (String) mapTitle.get("rendered");
                mapContent = (Map<String, Object>) mapPost.get("content");
                postContent[i] = (String) mapContent.get("rendered");
            }
            if(!alreadyNotified(postTitle[0])){
                Log.d("not notified","");
                createNotif(postContent[0],postTitle[0]);
                saveNotificationKey(postTitle[0]);
            }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();
}

推荐答案

您从计时器创建 requestQueue，因此每 5 秒一次.在您执行的代码中，您始终会创建一个新的请求队列.这行不通，您应该将 requestQueue 作为最终全局变量并在构造函数中仅创建一次.

You create the requestQueue from a timer, so every 5 seconds. And within your executed code you create always a new request queue. This won't work you should keep the requestQueue as final global variable and create it only once in your constructor.

public class NotifierService extends Service {
    private final RequestQueue rQueue;

    NotifierService() {
        this.rQueue = Volley.newRequestQueue(this);
    }

    private void setupNotificationListener() {
        // do your request handling
    }
}

OutOfMemoryError 可能是因为你创建了太多没有被正确垃圾回收的对象

The OutOfMemoryError might occur because you create so many objects which are not correctly garbage collected

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