Question

Everything is in the title.

On the official documentations it is stated that Note that services, like other application objects, run in the main thread of their hosting process and AsyncTask only works if it is executed in the UIThread.

So is it possible to use AsyncTask in a Service class?

I am trying to do so but I’m always getting the same error

05-01 18:09:25.487: ERROR/JavaBinder(270): java.lang.ExceptionInInitializerError

…

05-01 18:09:25.487: ERROR/JavaBinder(270): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

Am I doing something wrong or is this just impossible ?

Here is the code of my Service class

package com.eip.core;

import android.app.Service;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;

public class NetworkService extends Service {


    private final INetwork.Stub mBinder = new INetwork.Stub() {

        @Override
        public int doConnect(String addr, int port) throws RemoteException {
            new ConnectTask().execute("test42");
            return 0;
        }
    };

    @Override
    public IBinder onBind(Intent arg0) {
        return mBinder;
    }

    private class ConnectTask extends AsyncTask<String, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            Log.i("OnPreExecute()", "");
        }

        @Override
        protected Void doInBackground(String... arg0) {
            Log.i("doInBackground()", "");
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            Log.i("OnPostExecute()", "");
        }

    }
}

Answer 1

I Think I found why it is not working in my case.

Here I am using this :

private final INetwork.Stub mBinder = new INetwork.Stub() {

        @Override
        public int doConnect(String addr, int port) throws RemoteException {
            new ConnectTask().execute("test42");
            return 0;
        }
    };

I am using this to do what so called IPC, Inter Process Communication, so I guess that my Service and my Activity are in two differents process, AsyncTask must be executed in the main UI thread according to the android doc, so why I was trying to do seems to me just impossible according to those facts.

If I am wrong please someone can correct me.