【Android】SparseBooleanArray 應用

ref:
checkboxes using SparseBooleanArray-StackOverflow
SparseArray淺析

	....
	SparseBooleanArray checkedPositions = ((AlertDialog) dialog).getListView().getCheckedItemPositions();
	String print = "";
	int[] array = asIntArray(checkedPositions);
	for (int i = 0; i < array.length; i++) {
	print = print + " " + array[i];
	}
	....
	private static int[] asIntArray(SparseBooleanArray checkedItems) {
	int checked = 0;
	// compute number of items
	for (int i = 0; i < checkedItems.size(); i++) {
	int key = checkedItems.keyAt(i);
	if (checkedItems.get(key)) {
	++checked;
	}
	}
	int[] array = new int[checked];
	//add indexes that are checked
	for (int i = 0, j = 0; i < checkedItems.size(); i++) {
	int key = checkedItems.keyAt(i);
	if (checkedItems.get(key)) {
	array[j++] = key;
	}
	}
	Arrays.sort(array);
	return array;
	}

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