Question

I have a problem with a progressbar spinner:

ProgressBarSpinner spinner = new ProgressBarSpinner();
spinner.execute(Spin);

Login LoginUser = new Login();
if(LoginUser.LoginUser(UserNameValue.getText().toString(), PasswordValue.getText().toString())) {
    MessageBox("Login information", "You've been successfully logged in, press OK to continue.");
    Document XMLInfo = null;
    Passphrase = PasswordValue.getText().toString();
    try {
        XMLInfo = XMLfromString(LoginUser.ProfileXML);
        XML_ProfileParser(XMLInfo);
        TickerString = FillProfileSlider(XMLInfo);              
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    Spin.setVisibility(ProgressBar.GONE);

    setContentView(R.layout.profile);

    TextView ProfileTicker = (TextView)findViewById(R.id.ProfileTicker);
    TextView UserInformation = (TextView)findViewById(R.id.NameInfo);
    TextView MoneyLabel = (TextView)findViewById(R.id.MoneyInfo);

    UserInformation.setText(ProfileInfo.get("FirstName") + " " + ProfileInfo.get("LastName"));
    MoneyLabel.setText(ProfileInfo.get("Money") + " Kr");

    if(Integer.parseInt(ProfileInfo.get("Messages")) >= 1) {
        ImageView MessageImage = (ImageView)findViewById(R.id.MailImage);
        MessageImage.setOnClickListener(ImageListener);
        MessageImage.setVisibility(ImageView.VISIBLE);
    }

    ProfileTicker.setText(Html.fromHtml(TickerString));
}
else {
    Spin.setVisibility(ProgressBar.GONE);
    MessageBox("Login information", "The submitted login information seems to be invalid.");
}

This gets executed when users click login. Spin is a global progressbar variable. Below is the Async class that is used to handle the spinner.

private class ProgressBarSpinner extends AsyncTask<ProgressBar, Integer, ProgressBar>
{

    protected ProgressBar doInBackground(ProgressBar...Spinner) {
        return Spinner[0];
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    protected void onPostExecute(ProgressBar Spinner) {
        Spinner.setVisibility(ProgressBar.VISIBLE);
        Spinner.showContextMenu();
    }
}

To the problem: If I try to write

Spin.setVisibility(ProgressBar.GONE);

after the logins authorization the spinner does not get displayed at all. But if I remove the ProgressBar.Gone part the spinner is displayed.
But if that part is present is seems that the application “hangs” before it continues (either logging the user in or displaying an error message telling that the username or password is wrong).

What can the problem be?

I know for sure that the login is not done so fast that the spinner does not get time to be displayed before it is set to GONE.

Answer 1

You need to set your spinner to visible before creating your AsyncTask and hide it in onPostExecute, something like:

mySpinner.setVisibility(View.VISIBLE);
myAsyncTask.Execute(); // etc, etc

myAsyncTask:

protected void onPostExecute(ProgressBar Spinner) {
    Spinner.setVisibility(View.GONE);
}