Android 顶部下拉刷新添加数据&& 底部上拉刷新添加数据 ScrollListener

Android 顶部下拉刷新添加数据&& 底部上拉刷新添加数据 ScrollListener
代码如下：

</pre><pre name="code" class="java">package com.example.ListViewScroll;import java.util.ArrayList;import android.app.Activity;import android.os.Bundle;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.ArrayAdapter;import android.widget.ListView;public class MainActivity extends Activity {private ArrayList<String> data;private ArrayAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ListView listview = (ListView) findViewById(R.id.list_view);data = new ArrayList<String>();for (int i = 20; i >0; i--) {data.add("数据" + i);}adapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1,data);listview.setAdapter(adapter);listview.setOnScrollListener(new OnScrollListener() {private int firstVisibleItem, visibleItemCount, totalItemCount;@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {//判断条件为在顶部的时候下拉刷新添加一条数据if ((firstVisibleItem + visibleItemCount) < totalItemCount&& firstVisibleItem == 0) {addUpData();}//判断条件为在底部的时候上拉刷新添加一条数据if((firstVisibleItem+visibleItemCount)==totalItemCount){addBottomData();}}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {this.firstVisibleItem = firstVisibleItem;this.visibleItemCount = visibleItemCount;this.totalItemCount = totalItemCount;}});}private void addUpData() {//ListView中添加数据，注意add方法中第一个参数0是在第一行添加data.add(0,"添加的数据"+data.size());//添加数据后适配器adapter调用notifyDataSetChanged()adapter.notifyDataSetChanged();}private void addBottomData() {//ListView中添加数据，注意add方法中第一个参数0是在第一行添加data.add("添加的数据"+data.size());//添加数据后适配器adapter调用notifyDataSetChanged()adapter.notifyDataSetChanged();}}

布局文件

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.ListViewScroll.MainActivity"    android:background="@android:color/background_dark" >    <ListView         android:id="@+id/list_view"        android:layout_width="match_parent"        android:layout_height="wrap_content"        ></ListView></RelativeLayout>

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