Android中ListView分页加载数据

一页20条数据，下拉滑动到底部时加载新数据

关键点：给listview设置滚动监听，当滚动状态变化，且最后一个可见listitem（lv.getLastVisiblePosition()）的位置等于listview的长度则加载新数据

实现效果：

布局：activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
	    <ListView 
	        android:id="@+id/lv"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content">
	    </ListView>
	    <LinearLayout 
		    android:visibility="invisible"
		    android:id="@+id/ll_loading"
		    android:layout_width="fill_parent"
        	android:layout_height="fill_parent"
		    android:orientation="vertical"
		    android:gravity="center"
		    >
		    <ProgressBar 
		        android:layout_width="wrap_content"
        		android:layout_height="wrap_content"
		        />
		    <TextView 
		        android:layout_width="wrap_content"
        		android:layout_height="wrap_content"
		        android:text="正在加载数据..."
		        />
		</LinearLayout>
    </FrameLayout>
</RelativeLayout>

MainActivity.java

package com.example.dividepageloadlistview;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.AbsListView.OnScrollListener;


public class MainActivity extends Activity {
	
	private ListView lv;
	private int maxnumber = 20;
	private ArrayList listViewValues;
	private ArrayAdapter<String> adapter;
	private LinearLayout llLoading;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView) findViewById(R.id.lv);
		listViewValues = new ArrayList();
		llLoading = (LinearLayout) findViewById(R.id.ll_loading);
        
		for(int i = 0; i < maxnumber; i++) {
			listViewValues.add("number:" + i);
		}
		adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listViewValues);
		lv.setAdapter(adapter);
		// 给listview设置滚动监听
		lv.setOnScrollListener(new OnScrollListener() {
			@Override
			public void onScrollStateChanged(AbsListView view, int scrollState) {
				int lastPosition = lv.getLastVisiblePosition();
				System.out.println("lastPosition::::::::" + lastPosition);
				if(scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
					if(lastPosition == listViewValues.size() - 1) {
						fillData();
					}
				}
			}
			@Override
			public void onScroll(AbsListView view, int firstVisibleItem,
					int visibleItemCount, int totalItemCount) {
			}
		});
    }
    
    public void fillData() {
		llLoading.setVisibility(View.VISIBLE);
		new Thread(){
			@Override
			public void run() {
				try {
					Thread.sleep(2000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				int i = listViewValues.size();
				for(int j = 0; j < maxnumber; j++) {
					listViewValues.add("number:" + (i + j));
				}
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						llLoading.setVisibility(View.INVISIBLE);
						adapter.notifyDataSetChanged();
					}
				});
			}
		}.start();
	}
}

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