android ListView分页展示
1、新建一个android项目，名称为ListViewAutoPage，其他参数可以自己配置，点击完成
2、首先在layout文件夹下声明listviewinfo.xml，作为listView的主要样式。其内容如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listViewInfo"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
3、声明列表中各个选项的信息展示，listitem.xml定义在layout文件夹下，其内容如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/listItem"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:paddingTop="10dp"
android:paddingBottom="10dp"/>
</LinearLayout>
4、设置“加载更多”按钮的样式文件，loadmore.xml。其内容是：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/moreButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="加载更多" />
</LinearLayout>
5、自定义适配器的实现。ListViewAutoAdapter继承BaseAdapter，其实现如下：
public class ListViewAutoAdapter extends BaseAdapter {
//定义结果集
private static Map<Integer,View> result = new HashMap<Integer,View>();
private List<String> items;
private LayoutInflater inflater; //布局信息
//构造函数，参数初始化
public ListViewAutoAdapter(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
//从数组中获取元素，如果view为空，则填充相应文本信息
contentView=result.get(position);
if(contentView==null){
contentView=inflater.inflate(R.layout.listitem, null);
//找到TextView ，进行文本赋值
TextView text=(TextView) contentView.findViewById(R.id.listItem);
//设置文本显示的内容
text.setText(items.get(position));
}
result.put(position, contentView);
return contentView;
}
public void addItem(String item) {
items.add(item);
}
}
6、ListViewAutoPageShow主体函数实现：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listviewinfo);
//控件初始化
loadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null);
moreButton = (Button) loadMoreView.findViewById(R.id.moreButton);
moreButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
moreButton.setText("正在加载..."); //设置按钮文字loading
//执行加载数据的线程
handler.postDelayed(new Runnable() {
@Override
public void run() {
loadData();
adapter.notifyDataSetChanged(); //数据集变化后,通知adapter
// listView.setSelection(visibleLastIndex - visibleItemCount + 1); //设置选中项
moreButton.setText("加载更多"); //恢复按钮文字
}
}, 1000);
}
});
listView = (ListView) this.findViewById(R.id.listViewInfo);
listView.addFooterView(loadMoreView); //设置列表底部视图
//初始化数据适配器
initAdapter();
listView.setAdapter(adapter); //自动为id是list的ListView设置适配器
listView.setOnScrollListener(this); //添加滑动监听
//按钮被选中的时候 触发的操作
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
//展示列表被选中的结果
Toast.makeText(getApplicationContext(), items.get(position),Toast.LENGTH_SHORT).show();
}
});
}
/**
* 初始化适配器
*/
private void initAdapter() {
for (int i = 0; i < 10; i++) {
items.add("第"+String.valueOf(i + 1)+"个选项");
}
adapter = new ListViewAutoAdapter(items,this);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE ) {
//如果是自动加载,可以在这里放置异步加载数据的代码
Log.i("LOADMORE", "loading...");
}
}
/**
* 模拟加载数据
*/
private void loadData() {
int count = adapter.getCount();
for (int i = count; i < count + 10; i++) {
adapter.addItem("第"+String.valueOf(i + 1)+"个选项");
}
}
7、程序书写完毕之后，开始运行程序，观察实验结果
