Android ListView 下拉刷新 上拉更多[实例]

From：http://www.cnblogs.com/stay/archive/2011/08/22/2146134.html

旧代码作废了，换成新的把，源码在 http://www.stay4it.com/?p=245

 

今天得需求是做listview+上下拉动在header和footer显示progressdialog，但不影响用户操作

直接上代码，我已经加上注释了，自己看。

 

package  com.stay.main;

import  java.net.HttpURLConnection;
import  java.util.ArrayList;
import  java.util.HashMap;

import  org.json.JSONObject;

import  android.app.Activity;
import  android.app.ProgressDialog;
import  android.graphics.drawable.Drawable;
import  android.os.Bundle;
import  android.os.Handler;
import  android.os.HandlerThread;
import  android.os.Looper;
import  android.os.Message;
import  android.view.LayoutInflater;
import  android.view.View;
import  android.widget.AbsListView;
import  android.widget.AbsListView.OnScrollListener;
import  android.widget.Button;
import  android.widget.LinearLayout;
import  android.widget.ListView;
import  android.widget.RelativeLayout;
import  android.widget.TextView;

import  com.stay.wifi.R;

/**
 *  @author  Stay 
 * 动态加载listview数据，上拉 刷新，下拉 更多
  */
public   class  ListViewActivity  extends  Activity  implements  OnScrollListener {
     private   static   final   int  LOAD  =   0 ;
     private   static   final   int  ERROR  =   0 ;
     private   static   final   int  MEMBER  =   1 ;
     private   static   final   int  LOADED  =   2 ;
     private   static   final   int  DIALOG  =   3 ;
     private   static   final   int  FULL  =   4 ;
     private  NearbyAdapter adapter;
     private  ListView nearby_lv;
     private  RelativeLayout nearby_lv_header;
     private  Button list_bottom_btn;
     private  LinearLayout list_bottom_linear;
     private  TextView bottom_progress_text;
     private  RelativeLayout nearby_lv_footer;
     private  Button list_header_btn;
     private  LinearLayout list_header_linear;
     private  TextView heard_progress_text;
     private  ArrayList < JSONObject >  nearby_data  =   new  ArrayList < JSONObject > ();
     private   int  lastItem;
     private  HashMap < String, Drawable >  imageCache;
     private  com.stay.main.ListViewActivity.MyHandler myHandler;
     private  ProgressDialog dialog;
     private   int  curPage  =   1 ;
     private   boolean  isMember  =   false ;
     private   int  firstItem;
     public   int  count;

     /**  Called when the activity is first created.  */
    @Override
     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initView();
        myHandler.sendEmptyMessage(LOAD);
    }

    @Override
     public   void  onScrollStateChanged(AbsListView view,  int  scrollState) {
        DebugUtil.debug( " onScrollStateChanged " );
         // 当滚动停止且滚动的总数等于数据的总数，去加载
         if  (lastItem  ==  count  &&  scrollState  ==  SCROLL_STATE_IDLE) {
            DebugUtil.debug( " onScrollStateChanged--------next " );
             if  (curPage  ==   4   &&   ! isMember) {
                DebugUtil.show( this ,  " 您不是正式会员，请申请正式会员， " );
                list_bottom_linear.setVisibility(View.GONE);
            }  else  {
                 // 加载数据
                myHandler.sendEmptyMessage(LOAD);
            }
             return ;
        }
         // 当往上拉时更新数据，将data清空然后去重新加载
         if  (firstItem  ==   0   &&  scrollState  ==  SCROLL_STATE_IDLE) {
            DebugUtil.debug( " onScrollStateChanged--------refresh " );
            curPage  =   0 ;
            myHandler.sendEmptyMessage(LOAD);
        }
    }

    @Override
     public   void  onScroll(AbsListView view,  int  firstVisibleItem,  int  visibleItemCount,  int  totalItemCount) {
        DebugUtil.debug( " firstVisibleItem= "   +  firstVisibleItem);
        DebugUtil.debug( " visibleItemCount= "   +  visibleItemCount);
        DebugUtil.debug( " totalItemCount= "   +  totalItemCount);
         // 这里要减二，因为我加了header footer
        lastItem  =  firstVisibleItem  +  visibleItemCount  -   2 ;
        firstItem  =  firstVisibleItem;
    }

     public   int  getData() {
         try  {
            HttpURLConnection conn  =  DownloadUtil.download(url//自己写咯 );
            ArrayList < JSONObject >  temp  =  JSONUtil.streamToJsonList(conn.getInputStream());
             if  (curPage  ==   0   &&  nearby_data.size()  >   0 ) {
                nearby_data.clear();
                count  =   0 ;
            }
             if  (temp  !=   null   &&  temp.size()  >   0 ) {
                count  +=  temp.size();
                nearby_data.addAll(temp);
                DebugUtil.debug( " nearby_data.size()= " + nearby_data.size());
            }  else  {
                 return  FULL;
            }
             return  LOADED;
        }  catch  (Exception e) {
             return  ERROR;
        }
    }

     private  Handler handler  =   new  Handler() {
        @Override
         public   void  handleMessage(Message msg) {
             super .handleMessage(msg);
             switch  (msg.what) {
             case  DIALOG:
                list_bottom_linear.setVisibility(View.VISIBLE);
                list_header_linear.setVisibility(View.VISIBLE);
                 break ;
             case  LOADED:
                list_bottom_linear.setVisibility(View.GONE);
                list_header_linear.setVisibility(View.GONE);
                curPage ++ ;
                adapter.notifyDataSetChanged();
                 break ;
             case  ERROR:
                DebugUtil.debug( " error,missing data " );
                 break ;
             case  MEMBER:
                DebugUtil.debug( " you must regist formal member " );
                 break ;
             default :
                 break ;
            }
        }
    };
// 创建子线程加载数据，然后更新
     private   class  MyHandler  extends  Handler {
         private   int  status;

         public  MyHandler(Looper looper) {
             super (looper);
        }

        @Override
         public   void  handleMessage(Message msg) {
             synchronized  ( this ) {
                 switch  (msg.what) {
                 case  LOAD: //  get data from server
                    handler.sendEmptyMessage(DIALOG); // 显示等待框
                    status  =  getData();
                    handler.sendEmptyMessageDelayed(status,  1000 );
                     break ;
                 default :
                     break ;
                }
            }
        }
    }

     public   void  initView() {
        imageCache  =   new  HashMap < String, Drawable > ();
        HandlerThread handlerThread  =   new  HandlerThread( " nearby " );
         //  在使用HandlerThread的getLooper()方法之前，必须先调用该类的start();
        handlerThread.start();
        myHandler  =   new  MyHandler(handlerThread.getLooper());
        nearby_lv  =  (ListView) findViewById(R.id.nearby_lv);
        nearby_lv_footer  =  (RelativeLayout) LayoutInflater.from(ListViewActivity. this ).inflate(R.layout.nearby_lv_header,  null );
        list_bottom_btn  =  (Button) nearby_lv_footer.findViewById(R.id.list_bottom_btn);
        list_bottom_linear  =  (LinearLayout) nearby_lv_footer.findViewById(R.id.list_bottom_linear);
        bottom_progress_text  =  (TextView) nearby_lv_footer.findViewById(R.id.progress_text);
        nearby_lv_header  =  (RelativeLayout) LayoutInflater.from(ListViewActivity. this ).inflate(R.layout.nearby_lv_header,  null );
        list_header_btn  =  (Button) nearby_lv_header.findViewById(R.id.list_bottom_btn);
        list_header_linear  =  (LinearLayout) nearby_lv_header.findViewById(R.id.list_bottom_linear);
        heard_progress_text  =  (TextView) nearby_lv_header.findViewById(R.id.progress_text);
        list_header_btn.setText( " 刷新 " );
        list_bottom_btn.setText( " 更多 " );
        list_header_linear.setVisibility(View.GONE);
        nearby_lv.addHeaderView(nearby_lv_header);
        nearby_lv.addFooterView(nearby_lv_footer);
         //  list_header_btn.setOnClickListener(header_click);
        adapter  =   new  NearbyAdapter(ListViewActivity. this , nearby_data);
        nearby_lv.setAdapter(adapter);
        nearby_lv.setOnScrollListener(ListViewActivity. this );
    }
}

 

核心部分就是这了，其他adapter，downloadUtil,debugUtil都在以前的帖子里，就不发了。

现在有最新版了。大家可以去http://www.stay4it.com/forum.php?mod=viewthread&tid=2&extra=page%3D1看看

Own Website：http://www.stay4it.com/