When updating a ListView of CheckBox items, is it better to update the individual view, or notifyDataSetChanged() and invalidateViews()?

Question

Both of these work, but is one better than the other?

Update individual view:

public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    MyObject item = (MyObject) adapterView.getItemAtPosition(i);
    boolean isChecked = item.isChecked();
    item.setChecked(!isChecked);
    ((CheckBox)view.findViewById(R.id.checkBox)).setChecked(!isChecked);
}

Update all views:

public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    MyObject item = (MyObject) adapterView.getItemAtPosition(i);
    item.setChecked(!item.isChecked());
    adapter.notifyDataSetChanged();
    getListView().invalidateViews();
}

Answer 1

Updating individual view is bad, because findViewById take a long time (vs other methods) to execute and because there will be a case when you want to update a lot of list items (say, 20 items). You will not want to update your items one by one - it will take a lot of time and resources.

Now, take a look at your code when updating all items :

public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    MyObject item = (MyObject) adapterView.getItemAtPosition(i);
    item.setChecked(!item.isChecked());
    adapter.notifyDataSetChanged();
    getListView().invalidateViews(); //you can remove this line, read my explanation below
}

You called notifyDataSetChanged and invalidateViews, which is a waste in your case. Why?

notifyDataSetChanged will refresh the listview if an item's value/data has been changed.

Example : checkbox's value changed - like in your case.

Meanwhile, invalidateViews will refresh the listview if an item's properties has been changed.

Example : textview's color or text size changed.

Hence, in your case there is no need to call getListView().invalidateViews(); because no item's properties is changed, the one and only that changed is item's value/data.

UPDATE BY REQUEST :

This is an example where you should (and only need to) call invalidateViews :

public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    MyObject item = (MyObject) adapterView.getItemAtPosition(i); //lets say item is TextView
    item.setTextColor(Color.RED);
    item.setTextSize(2);    
    item.setBackgroundColor(Color.BLUE);
    getListView().invalidateViews();
}

Because setTextSize, setBackgroundColor, and setTextColor just change properties, not value/data.