ListView单选效果 简单实现

ListView 单选效果

通过控制列表图片是否显示 来实现选中效果

核心代码1,初始化选中位置,记录点击位置:
private int selectedPosition = -1;// 选中的位置
private int departmentSelectedPosition = 0;//记录已点击的位置 设置为-1,则无初始选中效果

核心代码2,处理选中的逻辑:
       if (selectedPosition == position) {
            convertView.setSelected(true);
            convertView.setPressed(true);
            holder.iv.setVisibility(View.VISIBLE);
        } else {
            convertView.setSelected(false);
            convertView.setPressed(false);
            holder.iv.setVisibility(View.INVISIBLE);
        }
        if (position == departmentSelectedPosition) {
            convertView.setSelected(true);
            convertView.setPressed(true);
            holder.iv.setVisibility(View.VISIBLE);
        }

核心代码3,处理条目点击逻辑 
  listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView adapterView, View view, int position, long l) {
            departmentSelectedPosition = position;
            myAdapter.notifyDataSetChanged();
        }
    });

Xml Activity布局

Xml Itemt布局

Activity 代码逻辑

public class MainActivity extends AppCompatActivity {
private ListView listView;
private MyAdapter myAdapter = new MyAdapter();
private List mList = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView = (ListView) findViewById(R.id.listView);
    initData();
    listView.setAdapter(myAdapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView adapterView, View view, int position, long l) {
            departmentSelectedPosition = position;
            myAdapter.notifyDataSetChanged();
        }
    });
}

private void initData() {
    for (int i = 0; i < 20; i++) {
        mList.add(String.format("饮 %s 壶浊酒",i));
    }

}

private int selectedPosition = -1;// 选中的位置
private int departmentSelectedPosition = 0;//记录已点击的位置 设置为-1,则无初始选中效果
class MyAdapter extends BaseAdapter{

    @Override
    public int getCount() {
        return mList == null?0:mList.size();
    }

    @Override
    public Object getItem(int i) {
        return mList.get(i);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {

        ViewHolder holder;
        if (convertView == null) {
            convertView = View.inflate(MainActivity.this,R.layout.item_list,null);
            holder = new ViewHolder();
            holder.tv = convertView.findViewById(R.id.tv_item_name);
            holder.iv = convertView.findViewById(R.id.iv_item_select);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }
            holder.tv.setText(mList.get(position));

        if (selectedPosition == position) {
            convertView.setSelected(true);
            convertView.setPressed(true);
            holder.iv.setVisibility(View.VISIBLE);
        } else {
            convertView.setSelected(false);
            convertView.setPressed(false);
            holder.iv.setVisibility(View.INVISIBLE);
        }
        if (position == departmentSelectedPosition) {
            convertView.setSelected(true);
            convertView.setPressed(true);
            holder.iv.setVisibility(View.VISIBLE);
        }

        return convertView;
    }

    class ViewHolder {
         TextView tv ;
        ImageView iv;
    }
}   }


![sad.png](https://upload-images.jianshu.io/upload_images/5301282-eb551c5783456545.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

![sdb.png](https://upload-images.jianshu.io/upload_images/5301282-159bedf999fdaecd.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)