android how to add ProgressBar to listView fetching data from parse?

Question

I've looked everywhere for a tutorial, but couldn't find a tutorial that uses ProgressBar ; they all use ProgressDialog which is simple but not in my need. So, can anyone give me an example? Here's how I am setting the adapter:

 setContentView(R.layout.activity_main);
        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);
        list = (ListView) findViewById(R.id.list);
        adapter = new mainAdapter(this);
        list.setAdapter(adapter);

ParseQueryAdapter getItemView() class:

@Override
    public View getItemView(Campaign campaign, View v, ViewGroup parent) {

        if (v == null) {
            v = View.inflate(getContext(), R.layout.list_single,null);
        }

        super.getItemView(campaign, v, parent);

        ParseImageView mealImage = (ParseImageView) v.findViewById(android.R.id.icon);
        ParseFile photoFile = campaign.getImage();
        if (photoFile != null) {
            mealImage.setParseFile(campaign.getImage());
            mealImage.loadInBackground(new GetDataCallback() {
                @Override
                public void done(byte[] data, ParseException e) {
                    // nothing to do
                }
            });
        }
        else{

        }

        TextView titleTextView = (TextView) v.findViewById(R.id.title);
        titleTextView.setText(campaign.getTitle());
        TextView descriptionTextView = (TextView) v
                .findViewById(R.id.description);
        descriptionTextView.setText(campaign.getDescription());
        return v;

    }

Would be a pleasure if you didn't -1 without thinking. Thanks :)

Answer 1

ProgressBar's are pretty simple. In XML, I usually position them inside of a FrameLayout at the same level as the main content, such as a ScrollView. In done() after your data has been fetched, hide the ProgressBar and show the ScrollView (or whatever view holds your main content). Hope this helps.

EDIT: If fetching images, use INVISIBLE instead of GONE when hiding whatever layout/views contain your images while the ProgressBar is visible; otherwise the size of the images won't be calculated correctly.