listview分页

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package com.bwei.listviewloadmore;import java.util.ArrayList;import java.util.HashMap;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.view.View.OnClickListener;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.Button;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.SimpleAdapter;import android.widget.Toast;public class MainActivity extends Activity implements OnScrollListener { // ListView的Adapter      private SimpleAdapter mSimpleAdapter;      private ListView lv;      private Button bt;      private ProgressBar pg;      private ArrayList<HashMap<String,String>> list;      // ListView底部View      private View moreView;      private Handler handler;      // 设置一个最大的数据条数，超过即不再加载      private int MaxDateNum;      // 最后可见条目的索引      private int lastVisibleIndex;  @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main); MaxDateNum = 22; // 设置最大数据条数            lv = (ListView) findViewById(R.id.lv);            // 实例化底部布局          moreView = getLayoutInflater().inflate(R.layout.moredata, null);            bt = (Button) moreView.findViewById(R.id.bt_load);          pg = (ProgressBar) moreView.findViewById(R.id.pg);          handler = new Handler();            // 用map来装载数据，初始化10条数据          list = new ArrayList<HashMap<String,String>>();          for (int i = 0; i < 10; i++) {              HashMap<String, String> map = new HashMap<String, String>();              map.put("ItemTitle", "第" + i + "行标题");              map.put("ItemText", "第" + i + "行内容");              list.add(map);          }          // 实例化SimpleAdapter          mSimpleAdapter = new SimpleAdapter(this, list, R.layout.item,                  new String[] { "ItemTitle", "ItemText" },                  new int[] { R.id.tv_title, R.id.tv_content });          // 加上底部View，注意要放在setAdapter方法前          lv.addFooterView(moreView);          lv.setAdapter(mSimpleAdapter);          // 绑定监听器          lv.setOnScrollListener(this);            bt.setOnClickListener(new View.OnClickListener() {                @Override              public void onClick(View v) {                  pg.setVisibility(View.VISIBLE);// 将进度条可见                  bt.setVisibility(View.GONE);// 按钮不可见                    handler.postDelayed(new Runnable() {                        @Override                      public void run() {                          loadMoreDate();// 加载更多数据                          bt.setVisibility(View.VISIBLE);                          pg.setVisibility(View.GONE);                          mSimpleAdapter.notifyDataSetChanged();// 通知listView刷新数据                      }                    }, 2000);              }          });  } private void loadMoreDate() {          int count = mSimpleAdapter.getCount();          if (count + 5 < MaxDateNum) {              // 每次加载5条              for (int i = count; i < count + 5; i++) {                  HashMap<String, String> map = new HashMap<String, String>();                  map.put("ItemTitle", "新增第" + i + "行标题");                  map.put("ItemText", "新增第" + i + "行内容");                  list.add(map);              }          } else {              // 数据已经不足5条              for (int i = count; i < MaxDateNum; i++) {                  HashMap<String, String> map = new HashMap<String, String>();                  map.put("ItemTitle", "新增第" + i + "行标题");                  map.put("ItemText", "新增第" + i + "行内容");                  list.add(map);              }          }        }        @Override      public void onScroll(AbsListView view, int firstVisibleItem,              int visibleItemCount, int totalItemCount) {          // 计算最后可见条目的索引          lastVisibleIndex = firstVisibleItem + visibleItemCount - 1;            // 所有的条目已经和最大条数相等，则移除底部的View          if (totalItemCount == MaxDateNum + 1) {            // lv.removeFooterView(moreView);  会报错            Toast.makeText(this, "数据全部加载完成，没有更多数据！", Toast.LENGTH_LONG).show();          }        }        @Override      public void onScrollStateChanged(AbsListView view, int scrollState) {          // 滑到底部后自动加载，判断listview已经停止滚动并且最后可视的条目等于adapter的条目          if (scrollState == OnScrollListener.SCROLL_STATE_IDLE                  && lastVisibleIndex == mSimpleAdapter.getCount()) {              // 当滑到底部时自动加载               pg.setVisibility(View.VISIBLE);               bt.setVisibility(View.GONE);               handler.postDelayed(new Runnable() {                             @Override               public void run() {               loadMoreDate();               bt.setVisibility(View.VISIBLE);               pg.setVisibility(View.GONE);               mSimpleAdapter.notifyDataSetChanged();               }                             }, 2000);            }        }  }
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