android - Why can't one add/remove items from an ArrayAdapter?

Question

I am using an ArrayAdapter<CharSequence> to populate the items to list in a android.widget.Spinner. That works all fine.

But now I want to keep the list of items dynamic, i.e. I want to be able to add/remove items from the selection list at runtime. However, when I call adapter.add(item) or adapter.remove(item) I always get a UnsupportedOperationException, even though the Javadocs of the ArrayAdapter class describe these two methods as to be usable for exactly that intended purpose.

Is this a bug, really not implemented or what am I missing here?

Answer 1

You probably initialized the adapter with a plain Java array (e.g., String[]). Try using something that implements the java.util.List interface (e.g., ArrayList<String>).