Android自定义Comparator,实现List按时间排序

package com.suntek.mobilemeeting.comparator;

import java.util.Comparator;

import com.suntek.mobilemeeting.model.User;

/**

* 根据用户离线时间定制的比较器

*

* @author by wwj

*

*/

public class OfflineUserComparator implements Comparator {

@Override

public int compare(Object obj1, Object obj2) {

User user1 = (User) obj1;

User user2 = (User) obj2;

int flag = user2.getLeftTime().compareTo(user1.getLeftTime());

return flag;

}

}

这样使用：

[java] view
plaincopy





// 离线

JSONArray offlineArray = json

.optJSONArray(StringUtil.RES_OFF_USER_INFO);

offlineUsers.clear();

for (int i = 0; offlineArray != null

&& i < offlineArray.length(); i++) {

JSONObject temp = (JSONObject) offlineArray.get(i);

User user = new User();

user.setUserId(temp.optString(StringUtil.USER_USERID));

user.setSerialNo(temp

.optString(StringUtil.USER_SERIAL_NO));

user.setUserName(temp.optString(StringUtil.USER_NAME));

user.setTelephone(temp

.optString(StringUtil.USER_TELEPHONE));

user.setStatus(-1);

user.setJoinDateTime(temp

.optString(StringUtil.USER_JOIN_DATE_TIME));

user.setLeftTime(temp

.optString(StringUtil.USER_LEFT_TIME));

user.setGroupNo(temp.optInt(StringUtil.USER_GROUP_NO));

user.setSubConfName(temp

.optString(StringUtil.USER_SUB_CONF_NAME));

offlineUsers.add(user);

}

OfflineUserComparator offlineUserComparator = new OfflineUserComparator();

Collections.sort(offlineUsers, offlineUserComparator);