John,
You can use this method:
http://developer.android.com/reference/android/os/AsyncTask.html#publishProgress(Progress...)
This method can be invoked from |doInBackground(Params...)| to publish
updates on the UI thread while the background computation is still
running. Each call to this method will trigger the execution of
|onProgressUpdate(Progress...)| on the UI thread.
|onProgressUpdate(Progress...)| will note be called if the task has
been canceled.
... and its twin brother, onProgressUpdate:
Runs on the UI thread after |publishProgress(Progress...)| is invoked.
The specified values are the values passed to
|publishProgress(Progress...)|.
-- Kostya
28.03.2011 21:21, john brown ?????:
I have a process, getNextBook, that takes maybe 5 or 20 seconds,
depending on the size of the next book. It works OK but I need to
inform the user that "I'm working, just wait" so they will not tell
the App to do something else before the getNextBook process finishes.
(the code for "something else" is not included for the sake of
simplicity). I have included the display of a ProgressDialog so the
user can see when it is working and when it finishes. I have
experimented until I got it to work but there is something I do not
understand. The code is abbreviated for the sake of simplicity and it
does work even if I have created some error when I abbreviated.)
I utilize AsyncTask to make another thread so I will not block the
main thread. I want to call the ProgressDialog directly from the
AsyncTask getNextBook_T, but I cannot get it to work. Is there a way
to implement the ProgressDialog directly from getNextBook_T? Or is it
OK (or necessary) to do it indirectly like the code shows?
Thanks for your help
<code>
package very.long.name.App01;
import android.app.Activity;
import android.app.ProgressDialog;
public class App01 extends Activity {
private ProgressDialog pd;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public boolean onOptionsItemSelected(MenuItem item) {
String strTemp;
switch (item.getItemId()) {
case R.id.mnuCkSrv:
// bla, bla, bla....
return true;
case R.id.mnuNextBook:
pd = ProgressDialog.show(this, "", "Downloading next
book...",
true);
new getNextBook_T().execute();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private class getNextBook_T extends AsyncTask<Void, Void, Integer> {
protected Integer doInBackground(Void... arg0 ) {
return getNextBook();
}
protected void onPostExecute(Integer result) {
pdDismisser();
setDisplay("");
}
}
public Integer getNextBook(){
// bla, bla, bla....
}
public void pdDismisser(){
pd.dismiss();
}
}
</code>
--
Kostya Vasilyev -- http://kmansoft.wordpress.com
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