滑到低不就会有更新,不同于Xlistview,这个用法非常的简单:
activity.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" tools:context=".MainActivity" android:background="#df2" > <ListView android:id="@+id/lv" android:layout_width="wrap_content" android:layout_height="wrap_content" ></ListView> </RelativeLayout>
一个简单的listview就可以实现:
MainActiivyt.class
package com.example.day6_listview_more;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.ViewTreeObserver.OnScrollChangedListener;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
//继承OnScrollListener以实现滑动刷新
public class MainActivity extends Activity implements OnScrollListener{
private ListView lv;
//反省是String
private ArrayAdapter<String> adapter=null;
//保存数据
private List<String> data=null;
//判断是否加载更多
private boolean isload=false;
//新数据的次数
int count=1;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView) findViewById(R.id.lv);
data=new ArrayList<String>();
initData("第一页");
adapter=new ArrayAdapter<String>(getApplicationContext(), R.layout.listitem,data);
lv.setAdapter(adapter);
lv.setOnScrollListener(this);
}
//listview在没有华东的时候的状态
private void initData(String param) {
// TODO Auto-generated method stub
for(int i=0;i<30;i++){
data.add(param+" daaaaaa"+i);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
//让listview得以刷新
isload=((firstVisibleItem+visibleItemCount)==totalItemCount);
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
if(isload&&scrollState==OnScrollListener.SCROLL_STATE_IDLE){//滚动事件结束
//滚动事件结束是开始触发新事件
Toast.makeText(getApplicationContext(), "开始加载数据", 1).show();
initData("web"+count);
count++;
adapter.notifyDataSetChanged();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
适配器里面用到的布局:
<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:text="aaa"> </TextView>