1. If your code is on onPostExecute(), your code is already running in
the UI thread. Just call a method on your activity to execute that
chunk of code (instead of holding a reference to 'context', hold a
reference to your activity instead).
2. Just call this again:
StudentTask st = new StudentTask(getThis());
st.execute(new Object[] {StudentTask.Task.AUTH, null, userName,
password });
Tasks are like executable messages that will be executed on a
background thread. Creating multiple tasks does not necessarily create
multiple threads. Tasks are scheduled on the available background
threads. Whenever you create a new AsyncTask and call 'execute', the
task will be scheduled on the next available thread. The next
available thread is obtained from a pool of threads (I don't know how
large the pool is that AsyncTask uses).
On Jan 22, 5:21 am, yasirmturk <[email protected]> wrote:
> i have a class derived from AsyncTask and i initialize it in my
> activity. Now i m facing two problems...
>
> 1. I want to send result back to my activity and execute a chunk of
> code in my activty on onPostExecute(Object result) event. (i tried
> handler but its not working)
> 2. I want to execute asynctask multiple times.
>
> Please suggest me some better solution or a fix to this...
> thanx in advance
>
> ACTIVITY CODE:
>
> StudentTask st = new StudentTask(getThis());
> st.execute(new Object[] {StudentTask.Task.AUTH,
> null, userName,
> password);
>
> CLASS CODE:
>
> public class StudentTask extends AsyncTask {
>
> private Context context;
> private ProgressDialog pd;
>
> public static enum Task {
> SYNCRONIZE, AUTH, ACTIVATE
> }
>
> public StudentTask(Context context) {
> super();
> this.context = context;
> }
>
> @Override
> protected void onPreExecute() {
> pd = ProgressDialog.show(context, "Please wait", "Starting");
> }
>
> @Override
> protected Object doInBackground(Object... params) {
>
> Object result = null;
> Task t = (Task) params[0];
> switch (t) {
> case AUTH:
> if (this.authenticateStudent(params[1].toString(),
> params[2].toString()).IsSuccessFul())
> {
> result = true;
> } else {
> result = false;
> }
> break;
> case SYNCRONIZE:
> result = this.synchronize(null, null);
> break;
> default:
> break;
> }
> return result;
> }
>
> @Override
> protected void onProgressUpdate(Object... values) {
> pd.setMessage(values[0].toString());
> super.onProgressUpdate(values);
> }
>
> @Override
> protected void onPostExecute(Object result) {
> pd.dismiss();
> // Send this result back to activity and execute some code
> there
> e.g. launch next activity or display error
> super.onPostExecute(result);
> }
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