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Android Android Lists and Adapters (2015) Custom ListViews getView() and the ViewHolder Pattern

Ganta Hemanth
Ganta Hemanth
6,460 Points
Posted by Ganta Hemanth
Ganta Hemanth
6,460 Points

getview() method of the adapter

The following is my adapter get view code..

public View getView(int position, View convertView, ViewGroup parent) {

        viewHolder holder;
        if(convertView==null){

            convertView = LayoutInflater.from(mContext).inflate(R.layout.daily_list_item,null);
            holder = new viewHolder();
            holder.iconImageView = (ImageView)convertView.findViewById(R.id.iconimageview);
            holder.dayLabel = (TextView) convertView.findViewById(R.id.daynamelabel);
            holder.temperatureLabel=(TextView) convertView.findViewById(R.id.temperatureLabel);
            convertView.setTag("holder");
        }
        else
        {
            holder = (viewHolder) convertView.getTag();
        }
        return null;
    }

How does convert view work? what is the significance of setTag() in the code??

I tried reading online sources but i couldn't get it solved. S

1 Answer

Ernest Grzybowski
Ernest Grzybowski
Treehouse Project Reviewer

Hey Ganta Hemanth

I could write out the answer here... but everything is explained wonderfully in this video.

https://www.youtube.com/watch?v=wDBM6wVEO70

It's straight from the guys at Google. The answer to your question starts at around 5:50, but I HIGHLY recommend watching the entire video.

zacharygassem
zacharygassem
3,697 Points

This is a great video, you should check it out to answer your question :]

Ganta Hemanth
Ganta Hemanth
6,460 Points
Ganta Hemanth
Ganta Hemanth
6,460 Points

THanks for the reply.. It really helped.. Can you help me with this question??

I really don't understand how recycle view works. I am comfortable with using the view holder in the list view but i just don't get what is going on with the recycle view.

So how does recycle view work?? What makes it better than the list view with view holder?