Why is ListView.getCheckedItemPositions() not returning correct values?

Question

The app has a ListView with multiple-selection enabled, in the UI it works as expected. But when I read the values out using this code:

Log.         


        

Answer 1

This is an old thread but since this basically came up first in current Google search here's a quick way to understand what listView.getCheckedItemPositions() does:

Unless the list Item wasn't 'toggled' at all in your ListView, it wont be added to the SparseBooleanArray that is returned by listView.getCheckedItemPositions()

But then, you really don't want your users to click every list item to "properly" add it to the returned SparseBooleanArray right?

Hence you need to combine the usage of valueAt() AND keyAt() of the SparseBooleanArray for this.

    SparseBooleanArray checkedArray = listView.getCheckedItemPositions();

    ArrayList entries = baseAdapter.getBackingArray(); //point this to the array of your custom adapter

    if (checkedArray != null)
    {
        for(int i = 0; i < checkedArray.size(); i++)
        {
            if(checkedArray.valueAt(i))    //valueAt() gets the boolean
                entries.yourMethodAtIndex(checkedArray.keyAt(i)); //keyAt() gets the key
        }
    }