Stormy App showing no data . after i click the 7day button? help with error plz.

private Context mContext;
private Day[] mDays;

public DayAdapter(Context context, Day[] days){
    mContext = context;
    mDays = days;
}
@Override
public int getCount() {
    return mDays.length;
}

@Override
public Object getItem(int position) {
    return mDays[position];
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;

    if (convertView == null){
        //brand new
        convertView = LayoutInflater.from(mContext).inflate(R.layout.daily_list_item, null);
        holder = new ViewHolder();
        holder.iconImageView = (ImageView)convertView.findViewById(R.id.iconImageView);
        holder.temperatureLabel = (TextView)convertView.findViewById(R.id.tempretureLable);
        holder.dayLabel = (TextView)convertView.findViewById(R.id.dayNameLabel);

        convertView.setTag(holder);
    }
    else {
        holder = (ViewHolder) convertView.getTag();
    }

    Day day = mDays[position];

    holder.iconImageView.setImageResource(day.getIconId());
    holder.temperatureLabel.setText(day.getTemperatureMax() + "");

    if (position == 0){
        holder.dayLabel.setText("Today");
    }
    else {
        holder.dayLabel.setText(day.getDayOfTheWeek());
    }
    return convertView;
}

private static class ViewHolder {
    ImageView iconImageView;
    TextView temperatureLabel;
    TextView dayLabel;

}