把一个activity改成Fragment，遇到了错误，求大神指导！！

public void finish() {
// TODO Auto-generated method stub
super.finish();
queue.removeLast();
}
其中的finish有错误，求大神指点

fragment有finish方法吗，你估计想调用getActivity().finish()吧

粘个完整的代码出来，，，

package com.example.fragmentdemo;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Queue;

import org.apache.http.conn.util.InetAddressUtils;

import com.example.fragmentdemo.R;
import com.transport.UserExpandableListAdapter;
import com.transport.ChatMessage;
import com.transport.User;
import com.transport.IpMessageConst;

import android.app.Fragment;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;

public class ContactsFragment extends Fragment implements OnClickListener {

public static String hostIp;

private ExpandableListView userList;

private UserExpandableListAdapter adapter;
private List<String> strGroups; //所有一级菜单名称集合
private List<List<User>> children;

private TextView totalUser;
private Button refreshButton;
private TextView ipTextView;;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View contactsLayout = inflater.inflate(R.layout.contacts_layout,
            container, false);

// return contactsLayout;

if(!isWifiActive()){    //若wifi没有打开，提示
    Toast.makeText(getActivity(), R.string.no_wifi, Toast.LENGTH_LONG).show();
}


findViews();

strGroups = new ArrayList<String>(); //所有一级菜单名称集合
children = new ArrayList<List<User>>();

// netThreadHelper = NetThreadHelper.newInstance();
BaseFragment.netThreadHelper.connectSocket(); //开始监听数据
BaseFragment.netThreadHelper.noticeOnline(); //广播上线

adapter = new UserExpandableListAdapter(getActivity(), strGroups, children);
userList.setAdapter(adapter);

refreshButton.setOnClickListener(this);
refreshViews();
return contactsLayout;

}

@Override
public void finish() {
// TODO Auto-generated method stub
super.finish();
BaseFragment.netThreadHelper.noticeOffline(); //通知下线
BaseFragment.netThreadHelper.disconnectSocket(); //停止监听

}

public void onViewCreated(View view, Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onViewCreated(view, savedInstanceState);
totalUser =(TextView)view.findViewById(R.id.totalUser);
userList = (ExpandableListView)view.findViewById(R.id.userlist);
refreshButton = (Button) view.findViewById(R.id.refresh);
ipTextView = (TextView) view.findViewById(R.id.mymood);
hostIp = getLocalIpAddress();
ipTextView.setText(hostIp); //设置IP
}

@Override
public void processMessage(Message msg) {
// TODO Auto-generated method stub
switch(msg.what){
case IpMessageConst.IPMSG_BR_ENTRY:
case IpMessageConst.IPMSG_BR_EXIT:
case IpMessageConst.IPMSG_ANSENTRY:
case IpMessageConst.IPMSG_SENDMSG:
refreshViews();
break;
}
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK)
exit();
return true;
}

//更新数据和UI显示
private void refreshViews(){

//清空数据
strGroups.clear();
children.clear();

Map<String,User> currentUsers = new HashMap<String, User>();
currentUsers.putAll(BaseFragment.netThreadHelper.getUsers());
Queue<ChatMessage> msgQueue = BaseFragment.netThreadHelper.getReceiveMsgQueue();
Map<String, Integer> ip2Msg = new HashMap<String, Integer>();   //IP地址与未收消息个数的map
//遍历消息队列，填充ip2Msg
Iterator<ChatMessage> it = msgQueue.iterator();
while(it.hasNext()){
    ChatMessage chatMsg = it.next();
    String ip = chatMsg.getSenderIp();  //得到消息发送者IP
    Integer tempInt = ip2Msg.get(ip);
    if(tempInt == null){    //若map中没有IP对应的消息个数,则把IP添加进去,值为1
        ip2Msg.put(ip, 1);
    }else{  //若已经有对应ip，则将其值加一
        ip2Msg.put(ip, ip2Msg.get(ip)+1);
    }
}

//遍历currentUsers,更新strGroups和children
Iterator<String> iterator = currentUsers.keySet().iterator();
while (iterator.hasNext()) {
    User user = currentUsers.get(iterator.next());  
    //设置每个在线用户对应的未收消息个数
    if(ip2Msg.get(user.getIp()) == null){
        user.setMsgCount(0);
    }else{
        user.setMsgCount(ip2Msg.get(user.getIp()));
    }

    String groupName = user.getGroupName();
    int index = strGroups.indexOf(groupName);
    if(index == -1){ //没有相应分组，则添加分组，并添加对应child
        strGroups.add(groupName);

// List> childData = new ArrayList>();
// Map child = new HashMap();
// child.put("userName", user.getUserName());
// childData.add(child);
// children.add(childData);

        List<User> childData = new ArrayList<User>();
        childData.add(user);
        children.add(childData);
    }else{  //已存在分组，则将对应child添加到相对应分组中

// Map child = new HashMap();
// child.put("userName", user.getUserName());
// children.get(index).add(child);
children.get(index).add(user);
}

}

//更新groups

// for(int i = 0; i < strGroups.size(); i++){
// Map groupMap = new HashMap();
// groupMap.put("group", strGroups.get(i));
// groups.add(groupMap);
// }

adapter.notifyDataSetChanged(); //更新ExpandableListView

String countStr = "当前在线" + currentUsers.size() +"个用户";
totalUser.setText(countStr);    //更新TextView

}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.equals(refreshButton)){ //若是刷新
BaseFragment.netThreadHelper.refreshUsers();
refreshViews();
}

}

//判断wifi是否打开
public boolean isWifiActive(){
ConnectivityManager mConnectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if(mConnectivity != null){
NetworkInfo[] infos = mConnectivity.getAllNetworkInfo();

    if(infos != null){
        for(NetworkInfo ni: infos){
            if("WIFI".equals(ni.getTypeName()) && ni.isConnected())
                return true;
        }
    }
}

return false;

}

//得到本机IP地址
public String getLocalIpAddress(){
try{
Enumeration en = NetworkInterface.getNetworkInterfaces();
while(en.hasMoreElements()){
NetworkInterface nif = en.nextElement();
Enumeration enumIpAddr = nif.getInetAddresses();
while(enumIpAddr.hasMoreElements()){
InetAddress mInetAddress = enumIpAddr.nextElement();
if(!mInetAddress.isLoopbackAddress() && InetAddressUtils.isIPv4Address(mInetAddress.getHostAddress())){
return mInetAddress.getHostAddress().toString();
}
}
}
}catch(SocketException ex){
Log.e("MyFeiGeActivity", "获取本地IP地址失败");
}

return null;

}

//获取本机MAC地址
public String getLocalMacAddress(){
WifiManager wifi = (WifiManager)getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
return info.getMacAddress();
}

}
这是完整的代码，求指点！！！！