无法在ListView中修改ArrayAdapter:UnsupportedOperationException

public class MyAdapter extends BaseAdapter {
    private List<String> mData;

    public MyAdapter(List<String> data) {
        mData = data;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // 实现自己的getView方法
        return null;
    }
}

List<String> data = new ArrayList<>();
data.add("Item 1");
data.add("Item 2");
data.add("Item 3");

MyAdapter adapter = new MyAdapter(data);

ListView listView = findViewById(R.id.listView);
listView.setAdapter(adapter);

Button addButton = findViewById(R.id.addButton);
addButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        data.add("New Item");
        adapter.notifyDataSetChanged();
    }
});