如何使Service和AsyncTask进行通信

Question

I have this issue: I have a main activity that is bound to a service, Also, that main activity can call a class (AsyncTask) that is a client that connects to a server and waits for data.

I tried to make the bind from class (AsyncTask) client to the service, but I don't know if that's possible or do I have to return data to the main activity so main activity can send it to the service?

I can do this in the main class

Intent intent = new Intent(getApplication(), ChatHeadService.class);
startService(intent);
bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);

but how can I implement it in the class (AsyncTask) client?

Answer 1

You can return the data from your async task to the main activity this way.

protected void onProgressUpdate(Integer... progress) {
    setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
    showDialog("Downloaded " + result + " bytes");
}

Then you can pass that data from activity to service by calling startService(...) and passing data in an intent .

Calling startService(...) multiple times is safe and will not start multiple instances.

PS Running a server in Android doesn't sound right to me. Android devices should only be used as clients.

Answer 2

I think that you can just invoke the service from doInBackground() like you can in the activity. See this Stack Overflow post for a solution to a similar problem.