What is a ViewHolder Pattern in Android , and why is it necessary ?
In the cases of recycler view or list view, our code might call the findViewById() method multiple times. This results in a lot of resource loss and also memory wastage. To optimize this, we use the ViewHolder pattern, so that blocks of views are already made out, with all the views already in place, and the viewholder can simply replace the values for those views. Like let's say there are 5 different text views in each of the view in a list of 1000 elements. In that case, if we do not use a viewholder class, then the findViewById() method will be called 5000 times. Whereas, if we use a viewholder class, the the viewholder can simply contain the reference of those views and replace the values inside those views
This was the findViewbyId() metho would be called only 5 times as opposed to 5000 times. This allows a 1000x performance boost to the list/recycler view.
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