android listView点击item，高亮显示

最新推荐文章于 2024-07-14 02:10:39 发布

原创最新推荐文章于 2024-07-14 02:10:39 发布 · 976 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#listview #android开发

android开发专栏收录该内容

2 篇文章

订阅专栏

本文介绍如何在Android开发中实现ListView的点击高亮功能。关键步骤包括通知数据无效、记录选中项ID及在getView方法中设置背景颜色。通过这些代码实现ListView item被点击时的高亮显示。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

实现listView中选择item高亮的功能，最重要的代码就是

adapter.notifyDataSetInvalidated();

通知观察者，此条数据不再有效。
其次需要在实现BaseAdapter的类中添加一个方法，纪录选中的item的id

public void setCurrent(int current)
        {
            this.current = current;
        }

然后就是在getView方法中判断，position的值是否和current的值一样，然后指定你想要呈现的item的背景或颜色。
代码如下：

public class MyBaseAdapter extends Activity implements AdapterView.OnItemClickListener{

    private ListView listView;
    private Base adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_base_adapter);

        listView = (ListView) findViewById(R.id.listView);
        List<String> list = new ArrayList<String>();
        list.add("孙悟空");
        list.add("唐三藏");
        list.add("猪八戒");
        list.add("沙悟净");
        adapter = new Base(list);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);

    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        adapter.setCurrent(position);
        adapter.notifyDataSetInvalidated();
    }

    class Base extends BaseAdapter{

        private List<String> data;
        private int current;

        Base(List<String> data) {
            this.data = data;
        }

        public void setCurrent(int current)
        {
            this.current = current;
        }

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

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

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            HolderView holderView = null;
            if(convertView==null)
            {
                convertView = getLayoutInflater().inflate(R.layout.baseadapter_item,null);
                holderView = new HolderView((ImageView)convertView.findViewById(R.id.image),
                        (TextView)convertView.findViewById(R.id.text));
                convertView.setTag(holderView);
            }
            holderView = (HolderView) convertView.getTag();

            if(current == position)
            {
                holderView.getImageView().setImageResource(android.R.drawable.ic_delete);
                holderView.getTextView().setText(data.get(position));
                holderView.getTextView().setTextColor(Color.RED);
            }else{
                holderView.getImageView().setImageResource(R.drawable.ic_launcher);
                holderView.getTextView().setText(data.get(position));
                holderView.getTextView().setTextColor(Color.BLACK);
            }
            return convertView;
        }
    }
    class HolderView{
        private ImageView imageView;
        private TextView textView;

        HolderView(ImageView imageView, TextView textView) {
            this.imageView = imageView;
            this.textView = textView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getTextView() {
            return textView;
        }
    }
}