本文实例讲述了Android使用ListView实现下拉刷新及上拉显示更多的方法。分享给大家供大家参考，具体如下：
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;
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;
@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);
}
}
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