Question

I have created a ProgressDialog in android and it works when I do a simple example.

For example, this works.

public void onClick(View v) 
{
    // Perform action on click
    System.out.println("Progess Bar");
    final ProgressDialog myProgressDialog = ProgressDialog.show(AndroidTestApplicationActivity.this,
                    "Please wait...", "Getting updates...", true);

    new Thread() 
    {
            public void run() 
            {
                    try
                    {
                            // Do some Fake-Work
                            sleep(5000);
                    } 
                    catch (Exception e) 
                    { 

                    }

                    // Dismiss the Dialog
                    myProgressDialog.dismiss();
            }
    }.start();

}

But once I add in a reference to my custom class, it just stops running this new thread.

    button1.setOnClickListener(new View.OnClickListener() 
{
    public void onClick(View v) 
    {
        // Perform action on click
        System.out.println("Progess Bar");
        // Display an indeterminate Progress-Dialog
        final ProgressDialog myProgressDialog = ProgressDialog.show(AndroidTestApplicationActivity.this,
                        "Please wait...", "Getting Updates...", true);

        new Thread() 
        {
                public void run() 
                {
                        try
                        {
                                HealthySubObject hsObject = new HealthySubObject();
                                // Do some more work with my hsObject - nothing happens after this point. 
                                sleep(5000);
                        } 
                        catch (Exception e) 
                        { 

                        }

                        // Dismiss the Dialog
                        myProgressDialog.dismiss();
                }
        }.start();

    }
});

What happens is that as soon as I click this button, the progress dialog flashes up on the screen real quick and then disappears. But if you look at my code, it should wait 5 seconds before disappearing. I have put debug statements before and after the reference to my custom class and I can see the statements before but not the ones after. Does anyone have any idea why that is happening? As long as my class is public I should be able to call it from a new thread, right?

I am still pretty new to android and this is my first adventure into multi-threaded android apps. Any help would be much appreciated.

SOLUTION

Thanks for your help everyone. It is working now.

    button1.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v) 
        {
            // Perform action on click
            System.out.println("Progess Bar");
            //ProgressDialog dialog = ProgressDialog.show(AndroidTestApplicationActivity.this, "", "Loading. Please wait...", true);
            // Display an indeterminate Progress-Dialog
            final ProgressDialog myProgressDialog = ProgressDialog.show(AndroidTestApplicationActivity.this,
                            "Please wait...", "Doing Extreme Calculations...", true);

            Handler handler = new Handler();
            handler.postDelayed(new Runnable() 
            {
                @Override
                public void run() 
                {
                    HealthySubObject hsObject = new HealthySubObject();
                    ArrayList<HashMap<String, String>> onlineDB = hsObject.jsonToArray(); 
                    //
                    // more stuff goes here.  
                    //
                    //
                    myProgressDialog.dismiss();
                }
            }, 1500);

        }
    });

Answer 1

I would really recommend to use Handler instead of Thread. Using the Thread.sleep method is actually discouraged. Something like this is much better:

Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        HealthySubObject hsObject = new HealthySubObject();
        myProgressDialog.dismiss();
    }
}, 5000);