Difficulty in changing the message of progress dialog in async task

Question

I have created an async task and want to change the message of progress dialog during different stages of doBackground. Here is the code:

public class sc extends AsyncTask<Integer,String,Void>
    {
        ProgressDialog dialog;
        protected void onPreExecute()
        {
            dialog=new ProgressDialog(Loc.this);
            dialog.show();
        }
        @Override
        protected Void doInBackground(Integer... params) 
        {

            onProgressUpdate("Contacting server..Please wait..");
            //Do some work
            onProgressUpdate("Processing the result");
            //Do some work
            onProgressUpdate("Calculating..");
            dialog.dismiss();
            return null;
        }
        protected void onProgressUpdate(String ui)
        {
            dialog.setMessage(ui);
        }


}

But the problem is that, progress dialog is only showing the first message always. Kindly help me to find a solution.

Answer 1

protected Void doInBackground(Integer... params) 
{
    onProgessUpdate("Contacting server..Please wait..");
    ...
}

Urrrm, nope, that won't work.

Try...

publishProgress("Contacting server..Please wait..");

You have to "publish" your progress in doInBackground(..) in order for onProgressUpdate(...) to be called.

Also don't call dialog.dismiss() in doInBackground(...) call it in onPostExecute(...) instead.

Answer 2

I think it should be..

publishProgress("Your Dialog message..");

not

onProgessUpdate("Processing the result"); 

in doInBack..()

Something like,

protected Long doInBackground(URL... urls) {
      publishProgress("Hello");
     return null;
 }

 protected void onProgressUpdate(String msg) {
     dialog.setMessage(msg);

 }