How to continue the process in another class after the AsyncTask finished

Issue

i'm working on a project and i have a question about the AsyncTask. What i'm trying to do is to separate the AsyncTask from my classes, by writing it once and call it from any class. So I have created a class named A that is a fragment activity and contains a list view. In this class i'm creating an object of the AsyncTask to get data from the xml and create a list with this data. When the AsyncTask finished i want to send this list back to the class A and continue the process by adding the list in the list view and update the layout. What i have to do in the onPostExecute to past the data in the class A and how i can make the class to know about the process of the AsyncTask so it can continue? Thanks

Here is a simple of my code in which i'm creating the object of the AsyncTask.

GetXMLData load = new GetXMLData();
if (this.count == 1)
{
  load.Set_URL(XML_URL);
  this.count++;
}
else
{
  load.Set_URL(XML_URL, "?paged=" + this.count);
  this.count++;
}
LinkedList<Contents> content_list;
load.start_LoadContents();
this.list = new ArrayList<Contents>();
content_list = load.get_XML_List();
Log.i("content_list", "The content_list is " + content_list.size());

Solution

You can try this

public class MainActivity extends Activity implements TaskListener {

TaskListener listener;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    listener = this;
    new BackgroundTask(listener).execute("");

}

@Override
public void taskComplete(ArrayList<String> list) {
    if (list.size() != 0) {
        Log.i("Log", "list  " + list.get(0));
    }
}

}

TaskListener.java

public interface TaskListener {
    public void taskComplete(ArrayList<String> list);
}

BackgroundTask.java

public class BackgroundTask extends AsyncTask<String, String, String> {

TaskListener listner;
ArrayList<String> list = new ArrayList<String>();

public BackgroundTask(TaskListener l) {
    this.listner = l;
}

@Override
protected String doInBackground(String... params) {
    // do your background task like below
    list.add("Android");
    return null;
}

@Override
protected void onPostExecute(String result) {
    // TODO Auto-generated method stub
    super.onPostExecute(result);

    listner.taskComplete(list);

}

}

Answered By - Sonali8890