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 version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">

<ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     />

</LinearLayout>

Xml Itemt布局

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/rel_item_service" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">

<TextView
    android:id="@+id/tv_item_name"
    android:layout_marginLeft="12dp"
    android:layout_marginBottom="9dp"
    android:layout_marginTop="9dp"
    android:text=""
    android:textSize="14sp"
    android:textColor="#333333"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:gravity="left"
    android:layout_marginRight="60dp"
    android:layout_alignParentRight="true"
    android:layout_marginLeft="12dp"
    android:layout_marginBottom="9dp"
    android:layout_marginTop="9dp"
    android:text="¥ 1200元"
    android:textSize="14sp"
    android:textColor="#333333"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<ImageView
    android:visibility="invisible"
    android:src="@mipmap/icon_yiyuancheng"
    android:id="@+id/iv_item_select"
    android:layout_alignParentRight="true"
    android:layout_marginRight="12dp"
    android:layout_marginBottom="9dp"
    android:layout_marginTop="9dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</RelativeLayout>

Activity 代码逻辑

public class MainActivity extends AppCompatActivity {
private ListView listView;
private MyAdapter myAdapter = new MyAdapter();
private List<String> 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://img.haomeiwen.com/i5301282/eb551c5783456545.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

![sdb.png](https://img.haomeiwen.com/i5301282/159bedf999fdaecd.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)