By calling join() on the UI thread, you are blocking the UI thread.
It's as if you were not using a background thread. That's why the
ProgressDialog cannot be displayed.
On Thu, Sep 11, 2008 at 3:06 AM, roland <[EMAIL PROTECTED]> wrote:
>
> Hello, i have a question of displaying a ProgressDialog by joining the
> threads. In my application, i will synchronize data with the server,
> and remove the synchronized data from database. The synchronization
> takes long time, so i decide to display a progressdialog during this
> process. Of course i use a new thread to deal the synchronization,
> here is what i use for the first time:
>
> syncProgressDialog = ProgressDialog.show(Function.getContext(),
> "Please wait...", "Synchronizing application's data...", true, false);
>
> new Thread(new Runnable() {
> public void run() {
> synchronize();
> syncProgressDialog.dismiss();
> }
> }).start();
>
> removeData();
>
> The problem i met with this solution is the main thread didn't launch
> this thread immediately, it called the removeData before the new
> Thread. Apparently the main thread don't wait the new Thread finishes
> before execute the following method. So i changed this solution to :
>
> syncProgressDialog = ProgressDialog.show(Function.getContext(),
> "Please wait...", "Synchronizing application's data...", true, false);
>
> Thread thread = new Thread(new Runnable() {
> public void run() {
> synchronize();
> syncProgressDialog.dismiss();
> }
> });
> thread.start();
> try {
> thread.join();
> }
> catch (InterruptedException e) {
> e.printStackTrace();
> }
>
> removeData();
>
> I used the join method to wait the end of synchronize thread before
> removeData, there is another problem comes, the ProgressDialog didn't
> display on the screen. I tried use handler:
>
> Thread thread = new Thread(new Runnable() {
> public void run() {
> synchronize();
> handler.post(new Runnable() {
> public void run() {
> removeDialog();
> }
> });
> }
> });
>
> private void removeDialog() {
> syncProgressDialog.dismiss();
> }
>
> Nothing changed, could anyone show me a sample code to display the
> ProgressDialog in a joined thread or tell me which part i didn't
> implemented correctly.
>
>
> >
>
--
Romain Guy
www.curious-creature.org
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