Android微调器高亮显示所选项目 [英] Android spinner highlight selected item

问题描述

我有一个基本的android微调器，单击它后，我想得到一个列表，其中包含突出显示的一项，即最初选定的一项.

I've got basic android spinner and I would like to have, after clicking it, the list with items with one of them highlighted, the one, that was originally selected.

就像在这里完成的那样: http://www.warriorpoint.com/blog/wp-content/uploads/2009/05/05spinner-thumb.png

Like it's done here: http://www.warriorpoint.com/blog/wp-content/uploads/2009/05/05spinner-thumb.png

但是使用我自己的项目布局，而不是使用单选框，而是使用我自己的背景.

But with my own layout of the items and not with the radio box, but with my own background instead.

我该如何实现?选择器中是否有任何用处，还是我必须通过编程来完成?

How can I achieve this? Is there anything of use in the selector, or do I have to do it programatically?

感谢您的帮助.

推荐答案

以下是我测试并验证的解决方案.您可以使用setSelection(N)突出显示所需的项目.

Below is an solution I tested and verified. You can use setSelection(N) to highlight the item you want.

class HighLightArrayAdapter extends ArrayAdapter<CharSequence> {

        private int mSelectedIndex = -1;


        public void setSelection(int position) {
            mSelectedIndex =  position;
            notifyDataSetChanged();
        }

        public HighLightArrayAdapter(Context context, int resource, CharSequence[] objects) {
            super(context, resource, objects);
        }


        @Override
        public View getDropDownView(int position, View convertView, ViewGroup parent) {
            View itemView =  super.getDropDownView(position, convertView, parent);

            if (position == mSelectedIndex) {
                itemView.setBackgroundColor(Color.rgb(56,184,226));
            } else {
                itemView.setBackgroundColor(Color.TRANSPARENT);
            }

            return itemView;
        }
    }

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