My application has a ListView that uses an EfficientAdapter (i.e.,
APIDemos/Views/Lists/List 14) to display a list of custom views (a
TextView with some line drawing on the left of each row and a checkbox
on the right of each row).
In the ListView's onItemClick listener, the checkbox changes state
(checked or unchecked) if the whole ListView is invalidated with
mListView.invalidateViews(). However when I try invalidating just the
changed row by calling v.invalidate() or mListView.invalidate(l,t,r,b)
in the following code, the EfficientAdapter's getView() for the
changed row doesn't get called.
public void onItemClick(AdapterView<?> av, View v, int position,
long id) {
mApp.listData[mListIndex].toggleCheck(position+1);
// mListView.invalidateViews(); // this correctly updates the
checkbox state
// v.invalidate(); // this doesn't
mListView.invalidate(v.getLeft(), v.getTop(), v.getRight(),
v.getBottom()); // nor does this
Log.d("onItemClick", "invalidate l,t,r,b: " + v.getLeft() +
", " + v.getTop() +
", " + v.getRight() +
", " + v.getBottom());
}
What should onItemClick() call to invalidate just the checked/
unchecked row?
In a possibly related question, why does APIDemos/Views/Lists/List 11.
Multiple Choice List redraw all rows (seen by enabling Dev Tools/
Development Settings/Show Screen Updates) whenever any checkbox is
tapped?
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