Question

I have a GridView with four columns, on each item I added my library background (a shelf styled one), but the problem is, on the last line if there’s less than four itens, the background goes only until the last item, I need it to fill the row, how can I do that?

That’s my actual code:

public class LibraryGridView extends GridView {
    private LibraryActivity activity;

    public LibraryGridView(LibraryActivity activity) {
        super(activity);
        setBackgroundColor(Color.rgb(223, 223, 223));

        this.activity = activity;

        setNumColumns(activity.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? 6 : 4);
    }

    public void setData(List<LibraryItem> books) {
        setAdapter(new BookAdapter(getContext(), books));
    }

    private class BookAdapter extends ArrayAdapter<LibraryItem> {
        private List<LibraryItem> books;

        public BookAdapter(Context context, List<LibraryItem> books) {
            super(context, 0, books);
            this.books = books;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            BookGridView view = null;

            if (convertView == null)
                view = new BookGridView(activity);
            else
                view = (BookGridView) convertView;

            view.setBackgroundResource(R.drawable.background_grid);
            view.loadStateFrom(getItem(position));

            return view;
        }

        public LibraryItem getItem(int id) {
            return books.get(id);
        }

        public int getCount() {
            return books.size();
        }

        public long getItemId(int position) {
            return position;
        }
    }
}

Answer 1

I think you have to add empty item at the last of private List<LibraryItem> books in multiple of 4 and then pass it to array adapter, so yout list contain (n%4 = 0) item.

Here usage of 4 because your gridview has a 4 columns.

Thanks.