Spinner实现选项的拖拽排序与位置记忆

要实现Spinner选项的拖拽排序与位置记忆，可以通过自定义Adapter来实现。下面是一个简单的示例代码：

public class DragSortSpinnerAdapter extends ArrayAdapter<String> implements View.OnTouchListener {

    private SparseBooleanArray selectedItems;
    private int lastPosition = -1;

    public DragSortSpinnerAdapter(Context context, int resource, List<String> objects) {
        super(context, resource, objects);
        selectedItems = new SparseBooleanArray();
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View view = super.getDropDownView(position, convertView, parent);
        view.setTag(position);
        view.setOnTouchListener(this);
        return view;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        View view = (View) v.getParent();
        int position = (int) view.getTag();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                lastPosition = position;
                break;

            case MotionEvent.ACTION_MOVE:
                if(lastPosition != -1 && lastPosition != position) {
                    String item = getItem(lastPosition);
                    remove(item);
                    insert(item, position);
                    selectedItems.clear();
                    selectedItems.put(position, true);
                    notifyDataSetChanged();
                    lastPosition = position;
                }
                break;

            default:
                lastPosition = -1;
                break;
        }

        return true;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        if(selectedItems.get(position)) {
            view.setBackgroundColor(Color.LTGRAY);
        } else {
            view.setBackgroundColor(Color.TRANSPARENT);
        }
        return view;
    }
}

在使用Spinner时，可以使用这个自定义Adapter来实现拖拽排序和位置记忆的功能。当用户在Spinner选项上按下并移动时，会触发onTouch方法，Adapter会根据移动的位置重新排序选项，并在getView方法中根据selectedItems来设置选中项的背景色。这样就可以实现Spinner选项的拖拽排序与位置记忆功能了。