MainActivity如下:
package cn.com.bravesoft.testlistviewloadmore;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;
/**
* Demo描述:
* 精确监听ListView滑动到底部
* 且自动显示或异常隐藏FooterView
*
* 注意事项:
* 1 addFooterView()应该在要setAdapter()前执行.
* 否则报错:类型转换异常
* 2 ListView设置属性
* android:fastScrollEnabled="false"
* android:smoothScrollbar="true"
* 防止滑动的时候卡屏
* 3 关于FooterView的添加和删除
* 3.1每次总是先remove掉FooterView
* 3.2若有需求再add上FooterView
*/
public class MainActivity extends Activity {
private ListView mListView;
private SimpleAdapter mSimpleAdapter;
private HashMap<String, Object> mHashMap;
private View mFooterView;
private ArrayList<HashMap<String, Object>> mArrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
LayoutInflater layoutInflater =
(LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
mFooterView = layoutInflater.inflate(R.layout.listview_footer, null);
mListView=(ListView) findViewById(R.id.listView);
mArrayList=new ArrayList<HashMap<String,Object>>();
addDataForListView();
mSimpleAdapter=new SimpleAdapter
(MainActivity.this, mArrayList, R.layout.listviewitem, new String []{"id"},new int []{R.id.textView});
//为ListView设置FooterView
mListView.addFooterView(mFooterView);
//为ListView设置Adapter
mListView.setAdapter(mSimpleAdapter);
mListView.setOnScrollListener(new OnScrollListenerImple());
}
private void addDataForListView(){
System.out.println("====>Add data to ListView");
for (int i = 0; i < 10; i++) {
mHashMap=new HashMap<String, Object>();
mHashMap.put("id", ""+i);
mArrayList.add(mHashMap);
}
}
private class OnScrollListenerImple implements OnScrollListener{
@Override
public void onScroll(AbsListView listView, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
int lastItem = firstVisibleItem + visibleItemCount;
System.out.println("firstVisibleItem="+firstVisibleItem);
System.out.println("visibleItemCount="+visibleItemCount);
System.out.println("totalItemCount="+totalItemCount);
System.out.println("mArrayList.size()="+mArrayList.size());
if(lastItem == totalItemCount) {
View lastItemView=(View) listView.getChildAt(listView.getChildCount()-1);
if ((listView.getBottom())==lastItemView.getBottom()) {
System.out.println("==Scroll to the listview bottom ==");
if (mFooterView != null&&mListView.getFooterViewsCount()!=0) {
try {
//模拟数据加载业务
Thread.sleep(3000);
//每次总是先remove掉FooterView
mListView.removeFooterView(mFooterView);
} catch (Exception e) {
}
}
if (mArrayList.size()<30) {
if (mFooterView != null) {
//若有需求再add上FooterView
mListView.addFooterView(mFooterView);
addDataForListView();
mSimpleAdapter.notifyDataSetChanged();
}
}
}
}
}
@Override
public void onScrollStateChanged(AbsListView listview, int scrollState) {
}
}
}
main.xml如下:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fastScrollEnabled="false"
android:smoothScrollbar="true"
android:layout_centerInParent="true"
/>
</RelativeLayout>
listview_footer.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/footer_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="30dip"
android:paddingBottom="30dip"
android:clickable="true" >
<TextView
android:id="@+id/footer_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:text="loading more"
android:textSize="25sp"
/>
<ProgressBar
android:id="@+id/footer_progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
/>
</RelativeLayout>