[置顶] Android(安卓)ListView点击之后保持更换的背景色，实现已读功能

因为项目中有这样的需求：一般消息类或者资讯类的界面，都有类似于网易客户端的点击之后更换背景色，并且保持这个颜色，表示已读取该条信息。这个功能一开始觉得已经实现了，在我的另一篇博客上有：点击打开链接后来测试人员在测试的时候，发现这样一个奇怪的问题：

当点击了listview的第0项，背景颜色改变，并且保持着背景没错，但滑动到下一个页面的listview，原本没有点击的item，竟然莫名其妙的出现了更换的背景。。。

出现上述的情况是因为我实现的原理是这样的：当用户点击某一个item，会进入到监听方法里面，我设置一个变量保存所选中的位置position，也就是如下代码：

 arg1.setSelected(true);selectItem = arg2; // 当前选择的节目itemmessageAd.notifyDataSetChanged(); // 通知adapter刷新数据

在适配器里面，我就使用if语句判断，如果position等于刚才所点击的item，则设置背景颜色，如下代码：

if (selectItem == position) {//设置背景// }

上述设置就会出现错乱的问题，原因以后再深究，下面贴出解决的办法，不多说直接上代码，有注释：

package com.explink.listview;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Context;import android.graphics.Color;public class MainActivity extends Activity {private ListView mListView;private MyAdapter mAdapter;List<User> userList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();}private void initView() {mListView = (ListView) findViewById(R.id.mListView);}private void initData() {User user = new User("卢磊", "13319405061");User user1 = new User("小明", "13319405062");User user2 = new User("小黄", "13319405063");User user3 = new User("小绿", "13319405064");User user4 = new User("卢磊", "13319405061");User user5 = new User("小明", "13319405062");User user6 = new User("小黄", "13319405063");User user7 = new User("小绿", "13319405064");User user8 = new User("卢磊", "13319405061");User user9 = new User("小明", "13319405062");User user10 = new User("小黄", "13319405063");User user11 = new User("小绿", "13319405064");User user12 = new User("卢磊", "13319405061");User user13 = new User("小明", "13319405062");User user14 = new User("小黄", "13319405063");User user15 = new User("小绿", "13319405064");User user16 = new User("卢磊", "13319405061");User user17 = new User("小明", "13319405062");User user18 = new User("小黄", "13319405063");User user19 = new User("小绿", "13319405064");User user20 = new User("卢磊", "13319405061");User user21 = new User("小明", "13319405062");User user22 = new User("小黄", "13319405063");User user23 = new User("小绿", "13319405064");// 一般从网络上获取的数据都是List集合userList = new ArrayList<User>();userList.add(user);userList.add(user1);userList.add(user2);userList.add(user3);userList.add(user4);userList.add(user5);userList.add(user6);userList.add(user7);userList.add(user8);userList.add(user9);userList.add(user10);userList.add(user11);userList.add(user12);userList.add(user13);userList.add(user14);userList.add(user15);userList.add(user16);userList.add(user17);userList.add(user18);userList.add(user19);userList.add(user20);userList.add(user21);userList.add(user22);userList.add(user23);mAdapter = new MyAdapter(MainActivity.this, userList);mListView.setAdapter(mAdapter);mListView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {mAdapter.recordPosition(arg2);mAdapter.notifyDataSetChanged();}});}@SuppressLint("UseSparseArrays")public class MyAdapter extends BaseAdapter {private LayoutInflater inflater;private List<User> userList;private List<Integer> pList = new ArrayList<Integer>();public MyAdapter(Context context, List<User> userList) {this.inflater = LayoutInflater.from(context);this.userList = userList;}@Overridepublic int getCount() {return this.userList.size();}@Overridepublic Object getItem(int position) {return userList.get(position);}@Overridepublic long getItemId(int position) {return position;}public void recordPosition(int position) {pList.add(position);}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;if (convertView == null) {convertView = inflater.inflate(R.layout.list_item, null);holder = new ViewHolder();holder.name_tv = (TextView) convertView.findViewById(R.id.name_tv);holder.phone_tv = (TextView) convertView.findViewById(R.id.phone_tv);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}holder.name_tv.setText(userList.get(position).getName());holder.phone_tv.setText(userList.get(position).getPhoneNo());//防止convertView复用背景，导致第二页出现灰色背景，所以在判断设定为白色convertView.setBackgroundColor(Color.WHITE);for (int i = 0; i < pList.size(); i++) {if (pList.get(i) == position) {convertView.setBackgroundColor(Color.GRAY);}}return convertView;}public class ViewHolder {public TextView name_tv;public TextView phone_tv;}}}

数据源的类为：

package com.explink.listview;public class User {public User(){}public User(String name,String phoneNo){this.name = name;this.phoneNo = phoneNo;}private String name;private String phoneNo;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPhoneNo() {return phoneNo;}public void setPhoneNo(String phoneNo) {this.phoneNo = phoneNo;}}

资源已经上传到csdn，传送门在此： android listview已读功能，上一篇的博客如果有需要查看的，可以参考如下链接： android listview保持背景颜色

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