Question

I have a problem with creating a GridView-based calendar. Here is the Grid:

This is supposed to be a calendar populated with events, so I have my adapter implement OnClickListener and I set that listener for every button in the calendar. It works perfectly for every single button EXCEPT the first one(in this case number 30). When I click it just doesn’t work, but when I click on another button after I have attempted to click on the first one, it performs the click for the first one just before performing the click for the other button.

I’ve scanned about 10 pages of relevant questions and have not found someone to have this problem. Help please!

As asked, here is the getView function of my code:

    public View getView(int position, View convertView, ViewGroup parent)
    {
        View row = convertView;
        ViewHolder holder;
        if (row == null)
        {
            holder = new ViewHolder();
            LayoutInflater inflater = (LayoutInflater) _context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.calendar_day_gridcell, parent, false);
            holder.gridCell = (Button) row.findViewById(R.id.calendar_day_gridcell);
            holder.multiDayEvent = (EventLengthView)row.findViewById(R.id.eventLengthView);
        }
        else{
            holder = (ViewHolder)row.getTag();
        }

        int calendarGridHeight = (calendarView.getHeight()-5)/(getCount()/7);
        AbsListView.LayoutParams params = new AbsListView.LayoutParams(
                android.view.ViewGroup.LayoutParams.FILL_PARENT,
                calendarGridHeight);
        row.setLayoutParams(params);

        //Change the background drawable depending on the position in the calendar
        if ((position+1) % 7 == 0){
            holder.gridCell.setBackgroundDrawable(getResources().getDrawable(R.drawable.calendar_button_selector_end_row));
        }
        if (getCount() - position < 8){
            holder.gridCell.setBackgroundDrawable(getResources().getDrawable(R.drawable.calendar_button_selector_end_column));
        }
        if (position == getCount()-1){
            holder.gridCell.setBackgroundDrawable(getResources().getDrawable(R.drawable.calendar_button_selector_end));
        }
        holder.gridCell.setOnClickListener(this);

        holder.gridCell.setTag(null);//clear tags

        // ACCOUNT FOR SPACING
        String[] day_color = list.get(position).split("-");
        int theday = Integer.parseInt(day_color[0]);
        int themonth = Integer.parseInt(day_color[2]);
        int theyear = Integer.parseInt(day_color[3]);
        String date = DateFormat.format("dd/M/yy", new Date(theyear,themonth,theday)).toString();
        if ((!eventsMap.isEmpty()) && (eventsMap != null))
        {
            if (eventsMap.containsKey(date))
            {
                holder.multiDayEvent.SetMeasure(calendarView.getWidth()/7, calendarGridHeight);

                holder.multiDayEvent.setVisibility(View.VISIBLE);
                //holder.singleDayEvent.setVisibility(View.VISIBLE);
                Event event = (Event) eventsMap.get(date);
                holder.multiDayEvent.AddEvent(event);
                holder.gridCell.setTag(event);
            }
            else{
                //holder.singleDayEvent.setVisibility(View.GONE);
                holder.multiDayEvent.setVisibility(View.GONE);
            }
        }

        // Set the Day GridCell
        holder.gridCell.setText(Integer.toString(theday));

        if (day_color[1].equals("GREY"))
        {
            holder.gridCell.setTextColor(Color.GRAY);
        }
        if (day_color[1].equals("WHITE"))
        {
            holder.gridCell.setTextColor(Color.WHITE);
        }
        if (day_color[1].equals("BLUE"))
        {
            holder.gridCell.setTextColor(Color.BLUE);
        }

        row.setTag(holder);
        return row;
    }

    public class ViewHolder{
        Button gridCell;
        ImageView singleDayEvent;
        EventLengthView multiDayEvent;
    }

    public void onClick(View view)
    {
        if (view.getTag() != null){
            Event event = (Event)view.getTag();

            eventListView.setAdapter(new EventListAdapter(CalendarScreen.this, event));
            eventListViewLayout.setVisibility(View.VISIBLE);
            eventListViewLayout.startAnimation(fadeIn);
        }
        else if (eventListViewLayout.getVisibility() == View.VISIBLE){
            onBackPressed();
        }
    }

The onClick gets called for every gridcell EXCEPT the first one in the top left corner

Answer 1

Ok, I found the solution. The problem was these lines:

ViewHolder holder;
if (convertView == null)
{
    holder = new ViewHolder();
    LayoutInflater inflater = (LayoutInflater) _context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    convertView = inflater.inflate(R.layout.calendar_day_gridcell, parent, false);
    holder.gridCell = (Button) convertView.findViewById(R.id.calendar_day_gridcell_button);
    holder.multiDayEvent = (EventLengthView) convertView.findViewById(R.id.eventLengthView);
    convertView.setTag(holder);
}
else {
    holder = (ViewHolder) convertView.getTag();
}

When putting instatiating the gridCell button there, somehow, it mixes up the click listener of the first position in the adapter. I ended up fixing it by just instatiating the holder in every pass, instead of getting it by tag (which is better for performance, but oh well). Thanks everyone for the help.