Android Listview 分頁加載數據（滑到底部加載）

由於例子大部分內容都過於基礎，只是多了一個滑動的判斷，所以，直接上代碼

首先，主佈局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</RelativeLayout>

子Items

<?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" >

    <TextView
        android:id="@+id/textview"
        android:text="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

底部更多加載佈局

<?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" >

    <Button
        android:id="@+id/more"
        android:text="More"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

自定義適配器

package com.example.pullloadingmore;

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 MyAdatpter extends BaseAdapter {

    private static Map<Integer,View> m=new HashMap<Integer,View>();

    private List<String> items;
    private LayoutInflater inflater;

    public MyAdatpter(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.items, null);
            TextView text=(TextView) contentView.findViewById(R.id.textview);
            text.setText(items.get(position));
        }
        m.put(position, contentView);
        return contentView;
    }

    public void addItem(String item) {  
        items.add(item);  
    }  

}

主Activity

package com.example.pullloadingmore;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
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;   //最後的可視項索引  
        private int visibleItemCount;       // 當前窗口可見項總數  
        private MyAdatpter adapter;  
        private View loadMoreView;  
        private Button loadMoreButton;  
        private Handler handler = new Handler();  

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

            loadMoreView = getLayoutInflater().inflate(R.layout.more, null);  
            loadMoreButton = (Button) loadMoreView.findViewById(R.id.more);  
            loadMoreButton.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    loadMoreButton.setText("正在加載...");   //設置按鈕文字loading  
                    handler.postDelayed(new Runnable() {  
                        @Override  
                        public void run() {  

                            loadData();  

                            adapter.notifyDataSetChanged(); //數據集變化後,通知adapter  
                            listView.setSelection(visibleLastIndex - visibleItemCount + 1); //設置選中項  

                            loadMoreButton.setText("加載更多");    //恢復按鈕文字  
                        }  
                    }, 1000);  
                }
            });
            listView = (ListView) this.findViewById(R.id.listView);

            listView.addFooterView(loadMoreView);   //設置列表底部視圖  
           // listView.addHeaderView(v)    //設置列表頂部視圖

            initAdapter();  

            listView.setAdapter(adapter);                //自動爲id是list的ListView設置適配器  

            listView.setOnScrollListener(this);     //添加滑動監聽  
            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();
                }
            });
        }  

        /** 
         * 初始化適配器 
         */  
        private void initAdapter() {  

            for (int i = 0; i < 20; i++) {  
                items.add(String.valueOf(i + 1));  
            }  
            adapter = new MyAdatpter(items,this);  
        }  

        /** 
         * 滑動時被調用 
         */  
        @Override  
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {  
            this.visibleItemCount = visibleItemCount;  
            visibleLastIndex = firstVisibleItem + visibleItemCount - 1;  
        }  

        /** 
         * 滑動狀態改變時被調用 
         */  
        @Override  
        public void onScrollStateChanged(AbsListView view, int scrollState) {  
            int itemsLastIndex = adapter.getCount() - 1;    //數據集最後一項的索引  
            int lastIndex = itemsLastIndex + 1;             //加上底部的loadMoreView項  
            if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && visibleLastIndex == lastIndex) {  
                //如果是自動加載,可以在這裏放置異步加載數據的代碼  
                Log.i("LOADMORE", "loading...");  
                loadData();
                adapter.notifyDataSetChanged();
            }  
        }  


        /** 
         * 模擬加載數據 
         */  
        private void loadData() {  
            int count = adapter.getCount();  
            for (int i = count; i < count + 20; i++) {  
                adapter.addItem(String.valueOf(i + 1));  
            }  
        }


}