how to add item to Spinner's ArrayAdapter?

Question

i had a EditText , a button and a spinner . When click the button , the spinner will add a new item with name you entered in the EditText. But here is the question, my adap

Answer 1

When you have created your ArrayAdapter you haven't assigned a resizeable List to it, so when you do add() it cannot increment the size of it and throws a UnsupportedOperationException.

Try something like this:

List planets = new ArrayList();
adapter = new ArrayAdapter(context,
                       R.array.planets_array, planets);
//now you can call adapter.add()

You should use a List. With an Array such as CharSequence[] you would get the same UnsupportedOperationException exception.