Get number of selected items in android ListView

I have a multiselection ListView in my android app. What I ne开发者_如何学Goed to know is how many items on that list I have selected.

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Use getCheckedItemCount() of ListView. This gives you directly an int.

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I found a solution. getCheckedItemPositions() will create a SparceBooleanArray. So it is just to count the elements which are true in that array.

Example:

SparseBooleanArray positions = theListView.getCheckedItemPositions();
int counter = 0;
if (positions != null) {
    int length = positions.size();
    for (int i = 0; i < length; i++) {
        if (positions.get(positions.keyAt(i))) {
            counter++;
        }
    }
}

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Instead of using keyAt followed by get, we can use valueAt directly.

SparseBooleanArray checkedItemPositions = getListView().getCheckedItemPositions();
int count = 0;
for (int i = 0, ei = checkedItemPositions.size(); i < ei; i++) {
    if (checkedItemPositions.valueAt(i)) {
        count++;
    }
}