Yes, but if you wait, you block. Don't block the UI thread :) It is
much better to have the background thread post a message to a Handler
when it's done. I suggest you to use this class to perform your
threading work:
http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/UserTask.java
On Fri, Sep 12, 2008 at 12:40 AM, roland <[EMAIL PROTECTED]> wrote:
>
> Thanks for response, is there some other ways to wait the end of a
> thread?
>
>
>
> On 11 sep, 17:50, "Romain Guy" <[EMAIL PROTECTED]> wrote:
>> 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 Guywww.curious-creature.org
> >
>
--
Romain Guy
www.curious-creature.org
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