listview分页代码,Java代码库,德仔网

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【Java】 listview分页
作者:明昊 / 发布于2015/6/29/ 651

	package com.android.test0;
	
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	
	import android.content.Context;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.BaseAdapter;
	import android.widget.TextView;
	
	public class ListViewAdapter extends BaseAdapter {
	
	 private static Map<Integer,View> m=new HashMap<Integer,View>();
	
	 private List<String> items;
	 private LayoutInflater inflater;
	
	 public ListViewAdapter(List<String> items, Context context) {
	 super();
	 this.items = items;
	 this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	 }
	
	 @Override
	 public int getCount() {
	 // TODO Auto-generated method stub
	 return items.size();
	 }
	
	 @Override
	 public Object getItem(int position) {
	 // TODO Auto-generated method stub
	 return items.get(position);
	 }
	
	 @Override
	 public long getItemId(int position) {
	 // TODO Auto-generated method stub
	 return position;
	 }
	
	 @Override
	 public View getView(int position, View contentView, ViewGroup arg2) {
	 // TODO Auto-generated method stub
	 contentView=m.get(position);
	 if(contentView==null){
	 contentView=inflater.inflate(R.layout.listview_item, null);
	 TextView text=(TextView) contentView.findViewById(R.id.list_item_text);
	 text.setText(items.get(position));
	 }
	 m.put(position, contentView);
	 return contentView;
	 }
	
	 public void addItem(String item) {
	 items.add(item);
	 }
	
	
	}

	

	

	package com.android.test0;
	
	import java.util.ArrayList;
	import java.util.List;
	
	import android.os.Bundle;
	import android.os.Handler;
	import android.app.Activity;
	import android.util.Log;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.widget.AbsListView;
	import android.widget.AbsListView.OnScrollListener;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.Button;
	import android.widget.ListView;
	import android.widget.Toast;
	
	public class MainActivity extends Activity implements OnScrollListener{
	
	 List<String> items = new ArrayList<String>();
	 private ListView listView;
	 private int visibleLastIndex = 0; //最后的可视项索引
	 private int visibleItemCount; // 当前窗口可见项总数
	 private ListViewAdapter adapter;
	 private View loadMoreView;
	 private Button loadMoreButton;
	 private Handler handler = new Handler();
	
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.listview);
	
	 loadMoreView = getLayoutInflater().inflate(R.layout.load_more, null);
	 loadMoreButton = (Button) loadMoreView.findViewById(R.id.loadMoreButton);
	 loadMoreButton.setOnClickListener(new OnClickListener() {
	
	 @Override
	 public void onClick(View v) {
	 // TODO Auto-generated method stub
	 loadMoreButton.setText("正在加载..."); //设置按钮文字loading
	 handler.postDelayed(new Runnable() {
	 @Override
	 public void run() {
	
	 loadData();
	
	 adapter.notifyDataSetChanged(); //数据集变化后,通知adapter
	 listView.setSelection(visibleLastIndex - visibleItemCount + 1); //设置选中项
	
	 loadMoreButton.setText("加载更多"); //恢复按钮文字
	 }
	 }, 1000);
	 }
	 });
	 listView = (ListView) this.findViewById(R.id.listView1);
	
	 listView.addFooterView(loadMoreView); //设置列表底部视图
	 // listView.addHeaderView(v) //设置列表顶部视图
	
	 initAdapter();
	
	 listView.setAdapter(adapter); //自动为id是list的ListView设置适配器
	
	 listView.setOnScrollListener(this); //添加滑动监听
	 listView.setOnItemClickListener(new OnItemClickListener() {
	
	 @Override
	 public void onItemClick(AdapterView<?> arg0, View view,
	 int position, long arg3) {
	 // TODO Auto-generated method stub
	 Toast.makeText(getApplicationContext(), items.get(position),Toast.LENGTH_SHORT).show();
	 }
	 });
	 }
	
	 /**
	 * 初始化适配器
	 */
	 private void initAdapter() {
	
	 for (int i = 0; i < 20; i++) {
	 items.add(String.valueOf(i + 1));
	 }
	 adapter = new ListViewAdapter(items,this);
	 }
	
	 /**
	 * 滑动时被调用
	 */
	 @Override
	 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
	 this.visibleItemCount = visibleItemCount;
	 visibleLastIndex = firstVisibleItem + visibleItemCount - 1;
	 }
	
	 /**
	 * 滑动状态改变时被调用
	 */
	 @Override
	 public void onScrollStateChanged(AbsListView view, int scrollState) {
	 int itemsLastIndex = adapter.getCount() - 1; //数据集最后一项的索引
	 int lastIndex = itemsLastIndex + 1; //加上底部的loadMoreView项
	 if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && visibleLastIndex == lastIndex) {
	 //如果是自动加载,可以在这里放置异步加载数据的代码
	 Log.i("LOADMORE", "loading...");
	 }
	 }
	
	
	 /**
	 * 模拟加载数据
	 */
	 private void loadData() {
	 int count = adapter.getCount();
	 for (int i = count; i < count + 20; i++) {
	 adapter.addItem(String.valueOf(i + 1));
	 }
	 }
	
	
	
	}

	

	

	

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	 android:layout_width="match_parent"
	 android:layout_height="match_parent"
	 android:orientation="vertical" >
	
	 <ListView
	 android:id="@+id/listView1"
	 android:layout_width="match_parent"
	 android:layout_height="wrap_content" >
	 </ListView>
	
	</LinearLayout>

	

	

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	 android:orientation="vertical"
	 android:layout_width="fill_parent"
	 android:layout_height="fill_parent">
	 <TextView
	 android:id="@+id/list_item_text"
	 android:layout_width="fill_parent"
	 android:layout_height="fill_parent"
	 android:gravity="center"
	 android:textSize="20sp"
	 android:paddingTop="10dp"
	 android:paddingBottom="10dp"/>
	</LinearLayout>

	

	

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	 android:layout_width="fill_parent"
	 android:layout_height="wrap_content"
	 android:gravity="center"
	 android:orientation="vertical" >
	
	 <Button
	 android:id="@+id/loadMoreButton"
	 android:layout_width="fill_parent"
	 android:layout_height="wrap_content"
	 android:onClick="loadMore"
	 android:text="加载更多" />
	
	</LinearLayout>
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