关于expanded一级二级菜单数据的分组排序

public List<List<MyData>> sortList(){ List<MyData> mList = new ArrayList<MyData>();
String[] titleKind = new String[]{"张三","李四","王五","张三","赵六",
"王五","李四","张三","李四","王五","张三"};
for(int i=0;i<titleKind.length;i++){
MyData data = new MyData();
data.setTitle(titleKind[i]);
data.setMessage(""+i);
data.setDate(new Date());
mList.add(data);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//group
List<String> titleString = new ArrayList<String>();
for(int i=0;i<mList.size();i++){
if(!titleString.contains(mList.get(i).getTitle())){
titleString.add(mList.get(i).getTitle());
}
}
//根据group的类别分类数据
List<List<MyData>> allList = new ArrayList<List<MyData>>();
for(int j=0;j<titleString.size();j++){
List<MyData> childList = new ArrayList<MyData>();
for(int k=0;k<mList.size();k++){
if(mList.get(k).getTitle().equals(titleString.get(j))){
childList.add(mList.get(k));
}
}
//对child先按时间排序，再添加到group里面
Collections.sort(childList, new Comparator<MyData>() {
/**
*
* @param lhs
* @param rhs
* @return an integer < 0 if lhs is less than rhs, 0 if they are
* equal, and > 0 if lhs is greater than rhs,比较数据大小时,这里比的是时间
*/
@Override
public int compare(MyData lhs, MyData rhs) {
Date date1 = lhs.getDate();
Date date2 = rhs.getDate();
// 对日期字段进行升序，如果欲降序可采用after方法
if (date1.before(date2)) {
return 1;
}
return -1;
}
});
allList.add(childList);
}
//group排序后的list List<MyData> temp = new ArrayList<MyData>();
for(int i=0;i<allList.size();i++)
{
for (int j=allList.size()-1 ;j>i;j--)
{
if (allList.get(i).get(0).getDate().before(allList.get(j).get(0).getDate())){
temp = allList.get(i);
allList.set(i,allList.get(j));
allList.set(j,temp);
}
}
} for(int i=0;i<allList.size();i++){
for(int j=0;j<allList.get(i).size();j++){
System.out.println(allList.get(i).get(j).getTitle()+allList.get(i).get(j).getDate().toGMTString());
}
}
return allList;
}

class MyData{
private String title;
private String message;
private Date date;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
}

class TimeUtil {
//时间的一个转换方法
public static Date stringToDate(String dateString) {
ParsePosition position = new ParsePosition(0);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
Date dateValue = simpleDateFormat.parse(dateString, position);
return dateValue;
} public static List<MyData> timeHowLong(List<MyData> list){ Collections.sort(list, new Comparator<MyData>() {
/**
*
* @param lhs
* @param rhs
* @return an integer < 0 if lhs is less than rhs, 0 if they are
* equal, and > 0 if lhs is greater than rhs,比较数据大小时,这里比的是时间
*/
@Override
public int compare(MyData lhs, MyData rhs) {
Date date1 = lhs.getDate();
Date date2 = rhs.getDate();
// 对日期字段进行升序，如果欲降序可采用after方法
if (date1.before(date2)) {
return 1;
}
return -1;
}
}); Date now = new Date(System.currentTimeMillis());
for(int i=0;i<list.size();i++){ long time = now.getTime() - list.get(i).getDate().getTime(); int day=(int)(time/(24*60*60*1000));
int hour=(int)(time/(60*60*1000)-day*24);
int min=(int)((time/(60*1000))-day*24*60-hour*60);
Log.v("InfoCenter", "day:"+day+"hour:"+hour+"min:"+min);
String formatDay= null; if((0<day)&&(day<30)){
formatDay = day+"天"+"以前";
}else if((31<day)&&(day<365)){
formatDay = (day/30)+"月"+"以前";
}else if(day>=365){
formatDay = (day/365)+"年"+"以前";
}else{
if(0<hour){
formatDay = hour+"小时"+"以前";
}else{
formatDay = min+"分"+"以前";
}
}
list.get(i).setDate(formatDay);
}
return list;
}
}