ListView 点击 更多按钮 加载更多

参考了http://blog.youkuaiyun.com/cjjky/article/details/6898871

但是感觉楼主的代码比较繁琐 所以自己简化

package com.su.testmyloadmorelist;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

	private View loadMoreView;
	private Button loadMoreButton;
	private Handler handler = new Handler();
	private PaginationAdapter adapter;
	private int datasize;
	private ListView listView;

	int page = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		loadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null);
		loadMoreButton = (Button) loadMoreView
				.findViewById(R.id.loadMoreButton);
		listView = (ListView) findViewById(R.id.lvNews);
		listView.addFooterView(loadMoreView);
		loadData(page);

		loadMoreButton.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				loadMoreButton.setText("正在加载中..."); // 设置按钮文字
				handler.postDelayed(new Runnable() {
					public void run() {
						loadData(page);
						loadMoreButton.setText("查看更多..."); // 恢复按钮文字
					}
				}, 100);

			}
		});
	}

	/**
	 * 加载数据并显示到listview的逻辑
	 * 
	 * 如果希望点击更多立即显示下文 然后后台加载后面的数据的逻辑
	 * 需要把news做成一个全局变量上来先让listview加载已经下载好了的在内存的数据 
	 * 然后异步执行从网络加载数据的逻辑 赋给那个全局的news 等待下次的加载.
	 */
	private void loadData(int i) {
		List<News> news = new ArrayList<News>();
		int count = (i + 1) * 10;// 为什么计算count请看下面
		// 下面的代码将来通过服务器获得
		for (i = count - 9; i <= count; i++) {
			News items = new News();
			items.setTitle("Title" + i);
			items.setContent("This is News Content" + i);
			news.add(items);
		}

		if (page == 0) {
			adapter = new PaginationAdapter(news, this);
			listView.setAdapter(adapter);
		} else {
			adapter.addNewsItems(news);
			adapter.notifyDataSetChanged();
		}
		// 这里只是假设23是服务器返回的数据总数 如果计算的count大于23了 那么就不用显示加载更多按钮了.
		if (count > 23) {
			listView.removeFooterView(loadMoreView);
		}

		page++;
	}

	class PaginationAdapter extends BaseAdapter {

		List<News> newsItems;
		Context context;

		public PaginationAdapter(List<News> newsitems, Context context) {
			this.newsItems = newsitems;
			this.context = context;
		}

		@Override
		public int getCount() {
			return newsItems.size();
		}

		@Override
		public Object getItem(int position) {
			return newsItems.get(position);
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public View getView(int position, View view, ViewGroup parent) {
			if (view == null) {
				view = ((Activity) context).getLayoutInflater().inflate(
						R.layout.list_item, null);
			}

			// 新闻标题
			TextView tvTitle = (TextView) view.findViewById(R.id.newstitle);
			tvTitle.setText(newsItems.get(position).getTitle());
			// 新闻内容
			TextView tvContent = (TextView) view.findViewById(R.id.newscontent);
			tvContent.setText(newsItems.get(position).getContent());

			return view;
		}

		/**
		 * 添加数据列表项 调用notifychanged就可以刷新listview了
		 * 
		 * @param newsitem
		 */
		public void addNewsItem(News newsitem) {
			newsItems.add(newsitem);
		}

		/**
		 * 添加数据列表 调用notifychanged就可以刷新listview了
		 * 
		 * @param newsitem
		 */
		public void addNewsItems(List<News> newsitems) {
			newsItems.addAll(newsitems);
			Log.e("test", newsItems.size() + "");
		}

	}

}

http://dl.vmall.com/c0xbsbgsy6