Android ListView 下拉刷新 上拉更多[实例]

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("http://zdevl.mapi.jjdd.com/nearby/lbs?page=" +  curPage);
            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。

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