Android ListView加载更多

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先看效果：

ListView的footer布局：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:paddingBottom="10dp"    android:paddingTop="10dp" >    <TextView        android:id="@+id/pulldown_footer_text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:text="加载更多日志"        android:textSize="15dp" />    <ProgressBar        android:id="@+id/pulldown_footer_loading"        style="@android:style/Widget.ProgressBar.Small.Inverse"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerVertical="true"        android:layout_marginLeft="20dp"/></RelativeLayout>

ListView的item和main_activity布局很简单，分别是一个TextView和ListView,不再贴出。

MainActivity代码贴出：

import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView.OnScrollListener;import android.widget.AbsListView;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.RelativeLayout;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity{private ListView listview;private LayoutInflater inflater;private List<String> arrays = new ArrayList<String>();private RelativeLayout footer;private MyAdapter adapter;// 每页显示条数private Integer perpage = 20;// 当前页数private Integer currentpage = 1;// 最大页数private Integer maxpage = 1;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);setMaxPage(40);loadData(currentpage, perpage);inflater = getLayoutInflater();listview = (ListView) this.findViewById(R.id.pulldownview);footer = (RelativeLayout) View.inflate(getApplicationContext(), R.layout.pulldown_footer, null);listview.addFooterView(footer, null, true);adapter = new MyAdapter();listview.setAdapter(adapter);listview.setOnScrollListener(new OnScrollListener(){@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState){if (view.getLastVisiblePosition() == view.getCount() - 1){if (currentpage != maxpage){currentpage++;loadData(currentpage, perpage);adapter.notifyDataSetChanged();} else{Toast.makeText(getApplicationContext(), "没有更多的数据！", Toast.LENGTH_SHORT).show();listview.removeFooterView(footer);}}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount){}});}/** * 模拟分页查询数据 *  * @param currentpage当前页数 * @param perpage *            每页显示数 */private void loadData(Integer currentpage, Integer perpage){// 起始数据Integer firstResult = (currentpage - 1) * perpage;// 获取的最大数据Integer maxResult = currentpage * perpage;System.out.println("firstResult:"+firstResult+"  "+"maxResult:"+maxResult);// select * from database where XXXX order by XX limit firstResult,maxResult //order by可省略，但有order by时limit必需在它后面for (; firstResult < maxResult; firstResult++){arrays.add("这是测试数据" + (firstResult+1));}}/** * 模拟获取最大页数 *  * @param total *            总的数据 */private void setMaxPage(Integer total){if (total % perpage == 0){maxpage = total / perpage;} else{maxpage = total / perpage + 1;}System.out.println("maxpage:"+maxpage);}private class MyAdapter extends BaseAdapter{@Overridepublic int getCount(){return arrays == null ? 0 : arrays.size();}@Overridepublic Object getItem(int position){return null;}@Overridepublic long getItemId(int position){return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent){ViewHolder holder;if (convertView == null){holder = new ViewHolder();convertView = inflater.inflate(R.layout.item_list, null);holder.textView = (TextView) convertView.findViewById(R.id.text);convertView.setTag(holder);} else{holder = (ViewHolder) convertView.getTag();}holder.textView.setText(arrays.get(position));return convertView;}}private static class ViewHolder{TextView textView;}}

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