新手请教ListView 刷新问题

Question

这是显示ListView的界面
package com.security.phonepolice.view;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.Header;
import org.json.JSONException;
import org.json.JSONObject;

import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import com.security.phonepolice.ContantValues;
import com.security.phonepolice.R;
import com.security.phonepolice.entity.Msgbean;
import com.security.phonepolice.http.MyHttpclient;
import com.security.phonepolice.util.SharedPreferenceUtil;
import com.security.phonepolice.view.MessageManager.NotificationAdapter;
import com.security.phonepolice.view.OAFileFragment.FileViewHolder;
import com.security.phonepolice.view.widget.MyListView;
import com.security.phonepolice.view.widget.MyListView.RefreshListener;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class OANotifyFragment extends Fragment implements OnClickListener, OnItemClickListener{

private View view;
private ImageView mPreIv;
private MyListView mNotifyLv;
private LayoutInflater mInflater;
private NotifyAdapter adapter = null;
private TextView notifyUpload;
private List<Msgbean> mList;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.oa_notify_ui, container, false);
    mInflater = inflater;
    init();
    initEvent();
    return view;
}

private void init() {

    mNotifyLv = (MyListView) view.findViewById(R.id.oa_notify_lv);
}

private void initEvent() {

    mList = new ArrayList<Msgbean>();
    adapter = new NotifyAdapter(mList);
    mNotifyLv.setOnItemClickListener(this);
    mNotifyLv.setAdapter(adapter);
    mNotifyLv.setOnRefreshListener(new RefreshListener() {

        @Override
        public Object refreshing() {
            RequestParams params = new RequestParams();
            params.put("action", "Message");
            String serverAdd = SharedPreferenceUtil.getServerStringSP(getActivity(), "config", "serverAdd");
            MyHttpclient.post(serverAdd+ContantValues.IDCARD_URL, params, new AsyncHttpResponseHandler(){
                @Override
                public void onSuccess(
                        int statusCode,
                        Header[] headers,
                        String content) {
                    super.onSuccess(statusCode, headers, content);
                    if (!content.equals("failed")) {

                        Msgbean msgBean = new Msgbean();
                        try {
                            JSONObject jsonObject=new JSONObject(content);
                            msgBean.setTitle(jsonObject.getString("TITLE"));
                            msgBean.setContent(jsonObject.getString("CONTENT"));
                            Log.i("-----------", jsonObject.getString("TITLE"));
                            List<Msgbean> list = new ArrayList<Msgbean>();
                            list.add(msgBean);
                            mList = list;
                            adapter.notifyDataSetChanged();
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }else {
                        Toast.makeText(getActivity(), "刷新失败", Toast.LENGTH_LONG).show();
                    }
                }

                @Override
                public void onFailure(
                        Throwable error,
                        String content) {
                    Toast.makeText(getActivity(), "连接失败", Toast.LENGTH_LONG).show();
                    super.onFailure(error, content);
                }
            } );
            return null;
        }

        @Override
        public void refreshed(Object obj) {
            Toast.makeText(getActivity(), "刷新完毕", Toast.LENGTH_LONG).show();
        }

        @Override
        public void more() {
            Toast.makeText(getActivity(), "正在加载", Toast.LENGTH_LONG).show();
        }
    });
}

class NotifyAdapter extends BaseAdapter{

    private List<Msgbean> list;

    public NotifyAdapter(List<Msgbean> list) {
        this.list = list;
    }
    @Override
    public int getCount() {
        return list.size();
    }
    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        NotifyViewHolder viewHolder = null;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.oa_item, null);
            viewHolder = new NotifyViewHolder();
            viewHolder.itemIv = (ImageView) convertView.findViewById(R.id.oa_item_iv);
            viewHolder.itemTitle = (TextView) convertView.findViewById(R.id.oa_item_title);
            viewHolder.itemContent = (TextView) convertView.findViewById(R.id.oa_item_content);
            convertView.setTag(viewHolder);
        }else {
            viewHolder = (NotifyViewHolder) convertView.getTag();
        }
        viewHolder.itemIv.setImageResource(R.drawable.notification_small);
        viewHolder.itemTitle.setText(list.get(position).getTitle());
        viewHolder.itemContent.setText(list.get(position).getContent());

        return convertView;
    }

}

public static class NotifyViewHolder{
    public ImageView itemIv;
    public TextView itemTitle;
    public TextView itemContent;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    Intent intent = null;
    if (position > 0) {
        //去服务器拉取警情的详细信息
        intent = new Intent();
        intent.putExtra("InfoTag", "OANotify");
        intent.setClass(getActivity(), MessageDetail.class);
        startActivity(intent);
    }

}

}

这是在网上找到的自定义的ListView
package com.security.phonepolice.view.widget;

import java.text.SimpleDateFormat;
import java.util.Date;

import com.security.phonepolice.R;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

/**

• 下拉刷新，底部更多
  *
  */
  public class MyListView extends ListView implements OnScrollListener{

  private float mDownY;
  private float mMoveY;

  private int mHeaderHeight;

  private int mCurrentScrollState;

  private final static int NONE_PULL_REFRESH = 0; //正常状态
  private final static int ENTER_PULL_REFRESH = 1; //进入下拉刷新状态
  private final static int OVER_PULL_REFRESH = 2; //进入松手刷新状态
  private final static int EXIT_PULL_REFRESH = 3; //松手后反弹和加载状态
  private int mPullRefreshState = 0; //记录刷新状态

  private final static int REFRESH_BACKING = 0; //反弹中
  private final static int REFRESH_BACED = 1; //达到刷新界限，反弹结束后
  private final static int REFRESH_RETURN = 2; //没有达到刷新界限，返回
  private final static int REFRESH_DONE = 3; //加载数据结束

  private LinearLayout mHeaderLinearLayout = null;
  private LinearLayout mFooterLinearLayout = null;
  private TextView mHeaderTextView = null;
  private TextView mHeaderUpdateText = null;
  private ImageView mHeaderPullDownImageView = null;
  private ImageView mHeaderReleaseDownImageView = null;
  private ProgressBar mHeaderProgressBar = null;
  private TextView mFooterTextView = null;
  private ProgressBar mFooterProgressBar = null;

  private SimpleDateFormat mSimpleDateFormat;

  private Object mRefreshObject = null;
  private RefreshListener mRefreshListener = null;
  public void setOnRefreshListener(RefreshListener refreshListener) {
  this.mRefreshListener = refreshListener;
  }

  public MyListView(Context context) {
  this(context, null);
  }

  public MyListView(Context context, AttributeSet attrs) {
  super(context, attrs);
  init(context);
  }

  void init(final Context context) {
  mHeaderLinearLayout = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.refresh_list_header, null);
  addHeaderView(mHeaderLinearLayout);
  mHeaderTextView = (TextView) findViewById(R.id.refresh_list_header_text);
  mHeaderUpdateText = (TextView) findViewById(R.id.refresh_list_header_last_update);
  mHeaderPullDownImageView = (ImageView) findViewById(R.id.refresh_list_header_pull_down);
  mHeaderReleaseDownImageView = (ImageView) findViewById(R.id.refresh_list_header_release_up);
  mHeaderProgressBar = (ProgressBar) findViewById(R.id.refresh_list_header_progressbar);

  mFooterLinearLayout = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.refresh_list_footer, null);
  addFooterView(mFooterLinearLayout);
  mFooterProgressBar = (ProgressBar) findViewById(R.id.refresh_list_footer_progressbar);
  mFooterTextView = (TextView) mFooterLinearLayout.findViewById(R.id.refresh_list_footer_text);
  mFooterLinearLayout.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
          if ("加载更多".equals(mFooterTextView.getText())) {
              mFooterTextView.setText("正在加载");
              mFooterProgressBar.setVisibility(View.VISIBLE);
              if (mRefreshListener != null) {
                  mRefreshListener.more();
              }
          }
      }
  });
  
  setSelection(1);
  setOnScrollListener(this);
  measureView(mHeaderLinearLayout);
  mHeaderHeight = mHeaderLinearLayout.getMeasuredHeight();
  
  mSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm");
  mHeaderUpdateText.setText("下拉刷新"+ mSimpleDateFormat.format(new Date()));
  

  }

  @Override
  public boolean onTouchEvent(MotionEvent ev) {
  switch (ev.getAction()) {
  case MotionEvent.ACTION_DOWN:
  mDownY = ev.getY();
  break;
  case MotionEvent.ACTION_MOVE:
  mMoveY = ev.getY();
  if (mPullRefreshState == OVER_PULL_REFRESH) {
  mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
  (int)((mMoveY - mDownY)/3),
  mHeaderLinearLayout.getPaddingRight(),
  mHeaderLinearLayout.getPaddingBottom());
  }
  break;
  case MotionEvent.ACTION_UP:
  //when you action up, it will do these:
  //1. roll back util header topPadding is 0
  //2. hide the header by setSelection(1)
  if (mPullRefreshState == OVER_PULL_REFRESH || mPullRefreshState == ENTER_PULL_REFRESH) {
  new Thread() {
  public void run() {
  Message msg;
  while(mHeaderLinearLayout.getPaddingTop() > 1) {
  msg = mHandler.obtainMessage();
  msg.what = REFRESH_BACKING;
  mHandler.sendMessage(msg);
  try {
  sleep(5);
  } catch (InterruptedException e) {
  e.printStackTrace();
  }
  }
  msg = mHandler.obtainMessage();
  if (mPullRefreshState == OVER_PULL_REFRESH) {
  msg.what = REFRESH_BACED;
  } else {
  msg.what = REFRESH_RETURN;
  }
  mHandler.sendMessage(msg);
  };
  }.start();
  }
  break;
  }
  return super.onTouchEvent(ev);
  }

  @Override
  public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
  if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL
  && firstVisibleItem == 0
  && (mHeaderLinearLayout.getBottom() >= 0 && mHeaderLinearLayout.getBottom() < mHeaderHeight)) {
  //进入且仅进入下拉刷新状态
  if (mPullRefreshState == NONE_PULL_REFRESH) {
  mPullRefreshState = ENTER_PULL_REFRESH;
  }
  } else if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL
  && firstVisibleItem == 0
  && (mHeaderLinearLayout.getBottom() >= mHeaderHeight)) {
  //下拉达到界限，进入松手刷新状态
  if (mPullRefreshState == ENTER_PULL_REFRESH || mPullRefreshState == NONE_PULL_REFRESH) {
  mPullRefreshState = OVER_PULL_REFRESH;
  mDownY = mMoveY; //为下拉1/3折扣效果记录开始位置
  mHeaderTextView.setText("松手刷新");//显示松手刷新
  mHeaderPullDownImageView.setVisibility(View.GONE);//隐藏"下拉刷新"
  mHeaderReleaseDownImageView.setVisibility(View.VISIBLE);//显示向上的箭头
  }
  } else if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL && firstVisibleItem != 0) {
  //不刷新了
  if (mPullRefreshState == ENTER_PULL_REFRESH) {
  mPullRefreshState = NONE_PULL_REFRESH;
  }
  } else if (mCurrentScrollState == SCROLL_STATE_FLING && firstVisibleItem == 0) {
  //飞滑状态，不能显示出header，也不能影响正常的飞滑
  //只在正常情况下才纠正位置
  if (mPullRefreshState == NONE_PULL_REFRESH) {
  setSelection(1);
  }
  }
  }

  @Override
  public void onScrollStateChanged(AbsListView view, int scrollState) {
  mCurrentScrollState = scrollState;
  }

  @Override
  public void setAdapter(ListAdapter adapter) {
  super.setAdapter(adapter);
  setSelection(1);
  }

  private void measureView(View child) {
  ViewGroup.LayoutParams p = child.getLayoutParams();
  if (p == null) {
  p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
  ViewGroup.LayoutParams.WRAP_CONTENT);
  }

  int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
  int lpHeight = p.height;
  int childHeightSpec;
  if (lpHeight > 0) {
      childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
              MeasureSpec.EXACTLY);
  } else {
      childHeightSpec = MeasureSpec.makeMeasureSpec(0,
              MeasureSpec.UNSPECIFIED);
  }
  child.measure(childWidthSpec, childHeightSpec);
  

  }

  private Handler mHandler = new Handler(){
  @Override
  public void handleMessage(Message msg) {
  switch (msg.what) {
  case REFRESH_BACKING:
  mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
  (int) (mHeaderLinearLayout.getPaddingTop()*0.75f),
  mHeaderLinearLayout.getPaddingRight(),
  mHeaderLinearLayout.getPaddingBottom());
  break;
  case REFRESH_BACED:
  mHeaderTextView.setText("正在加载...");
  mHeaderProgressBar.setVisibility(View.VISIBLE);
  mHeaderPullDownImageView.setVisibility(View.GONE);
  mHeaderReleaseDownImageView.setVisibility(View.GONE);
  mPullRefreshState = EXIT_PULL_REFRESH;
  new Thread() {
  public void run() {
  if (mRefreshListener != null) {
  mRefreshObject = mRefreshListener.refreshing();
  }
  Message msg = mHandler.obtainMessage();
  msg.what = REFRESH_DONE;
  mHandler.sendMessage(msg);
  };
  }.start();
  break;
  case REFRESH_RETURN:
  mHeaderTextView.setText("下拉刷新");
  mHeaderProgressBar.setVisibility(View.INVISIBLE);
  mHeaderPullDownImageView.setVisibility(View.VISIBLE);
  mHeaderReleaseDownImageView.setVisibility(View.GONE);
  mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
  0,
  mHeaderLinearLayout.getPaddingRight(),
  mHeaderLinearLayout.getPaddingBottom());
  mPullRefreshState = NONE_PULL_REFRESH;
  setSelection(1);
  break;
  case REFRESH_DONE:
  mHeaderTextView.setText("下拉刷新");
  mHeaderProgressBar.setVisibility(View.INVISIBLE);
  mHeaderPullDownImageView.setVisibility(View.VISIBLE);
  mHeaderReleaseDownImageView.setVisibility(View.GONE);
  mHeaderUpdateText.setText("最新更新"+
  mSimpleDateFormat.format(new Date()));
  mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
  0,
  mHeaderLinearLayout.getPaddingRight(),
  mHeaderLinearLayout.getPaddingBottom());
  mPullRefreshState = NONE_PULL_REFRESH;
  setSelection(1);
  if (mRefreshListener != null) {
  mRefreshListener.refreshed(mRefreshObject);
  }
  break;
  default:
  break;
  }
  }
  };
  public interface RefreshListener {
  Object refreshing();
  void refreshed(Object obj);
  void more();
  }

  public void finishFootView() {
  mFooterProgressBar.setVisibility(View.GONE);
  mFooterTextView.setText("更多");
  }

  public void addFootView() {
  if (getFooterViewsCount() == 0) {
  addFooterView(mFooterLinearLayout);
  }
  }

  public void removeFootView() {
  removeFooterView(mFooterLinearLayout);
  }
  }
  这是实体类：
  package com.security.phonepolice.entity;

public class Msgbean {

private int id;
private String title;
private String content;
private String relName;
private String relTime;
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getTitle() {
    return title;
}
public void setTitle(String title) {
    this.title = title;
}
public String getContent() {
    return content;
}
public void setContent(String content) {
    this.content = content;
}
public String getRelName() {
    return relName;
}
public void setRelName(String relName) {
    this.relName = relName;
}
public String getRelTime() {
    return relTime;
}
public void setRelTime(String relTime) {
    this.relTime = relTime;
}

}
走到这一步法mNotifyLv.setOnRefreshListener(new RefreshListener() 就停了
为什么刷新的时候就是不走接口中的refreshing()方法。求大神指教啊！