[android-developers] Activity.showDialog/dismissDialog BUG

[Stoyan Damov]

Hi guys,

I think there's a bug in either showDialog, dismissDialog or
showing/dismissing a ProgressDialog using these 2 methods, which might
or might not be related to the fact that I'm displaying the dialog
from another thread (marshalled correctly via runOnUiThread).

Here's what I do:

I have a UI thread with a SurfaceView, and another thread which is
doing something asynchronously and needs to show progress.
So, let's say I have these methods on my view, which are accessed by
the background thread:

// BEGIN CODE

private static final int PROGRESS_DIALOG_ID = 888;
private String mProgressMessage;

void showProgress(final String message)
{
        mProgressMessage = message;
        mActivity.runOnUiThread(new Runnable()
        {
            public final void run()
            {
                System.out.println("DIALOG " + PROGRESS_DIALOG_ID + ":
about to display: " + message);
                mActivity.showDialog(PROGRESS_DIALOG_ID);
            }
        });
}

and

void hideProgress()
{
        mActivity.runOnUiThread(new Runnable()
        {
            public final void run()
            {
                mActivity.dismissDialog(PROGRESS_DIALOG_ID);
                System.out.println("DIALOG " + PROGRESS_DIALOG_ID + ": 
dismissed");
            }
        });
}

Here's the implementation of onCreate/onPrepareDialog in my activity:

@Override
protected Dialog onCreateDialog(int id)
{
        if (id == PROGRESS_DIALOG_ID)
        {
            System.out.println("DIALOG " + id + ": onCreateDialog called");

            mProgressDialog = new ProgressDialog(this);
            // setXxx, setYyy...
            mProgressDialog.setMessage(mProgressMessage);

            return mProgressDialog;
        }
        return super.onCreateDialog(id);
}

@Override
protected void onPrepareDialog(int id, Dialog dialog)
{
        super.onPrepareDialog(id, dialog);
        if (id == PROGRESS_DIALOG_ID)
        {
                ((ProgressDialog)dialog).setMessage(mProgressMessage);
                System.out.println("DIALOG " + id + ": prepared with message:
" + mProgressMessage);
        }
}

// END CODE

So, in my background thread, I call showProgress("Some message"), do
some work, and then call hideProgress() - this works, and the output
is:

DIALOG 888: about to display: Some message
DIALOG 888: onCreateDialog called
DIALOG 888: prepared with message: Some message
DIALOG 888: dismissed

But most importantly is that the dialog is indeed displayed.

Then, I chose an item from my menu, which makes the background thread
do some more work, and again it calls:
showProgress("Blah"), does some work, and then hideProgress -
according to the log all is good:

DIALOG 888: about to display: Blah
// onCreateDialog is NOT called, which is what's expected, the dialog is cached
DIALOG 888: prepared with message: Blah
DIALOG 888: dismissed

*EXCEPT* that the dialog is *NOT DISPLAYED* at all.

Now, this *IS* a bug and I'm pretty sure it's not mine too. I *know*
that, because even if I create the dialog and then *remove* it, and
then try to show another dialog (newly created, and even with a
different id!) it won't work either.

Has anyone experienced that and does anyone knows if there's a
workaround for this no matter how pervert it might be.

Thanks,
Stoyan

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