Asynctask in service with an 'onPostExecute' error

Issue

Consider:

Error : NullPointerException
        can't get data in onPostExecute();

I create an AsyncTask in onStartCommand() of a Service;

After startService:

1. LoadDataFromNetwork.getData runs in doInBackground. This method will get data from the Internet. It can be work, and I can see the Log;

2. I can't get data in onPostExcute();

   Why?

3. Error image

   

4. Code:

    public class Service_LoadAndStoreData extends Service {
   
        @Override
        public void onCreate() {
            super.onCreate();
        }
   
        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {
   
            Log.d(Application.TAG , "service start");
            new AsyncTask<Void ,Void ,List<ChannelBeans>>(){
                @Override
                protected List<ChannelBeans> doInBackground(Void... params) {
                    return LoadDataFromNetwork.getData();//it can be work
                }
   
                @Override
                protected void onPostExecute(List<ChannelBeans> channelBeanses) {
                    super.onPostExecute(channelBeanses);
                    Log.d(Application.TAG , channelBeanses.toString()); //Error :NullPointerException;
                }
            }.execute();
   
            return super.onStartCommand(intent, flags, startId);
        }
   
        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }
    }
   

Solution

The problem is at the getData() method from LoadDataFromNetwork class, I think.

Answered By - TFC