ListView 分页显示（转载+修改）上

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实习工作中，分配到了一个给已经上线的android成品增加需求的任务，其中一项是给每个信息显示增加分页显示的功能（ListView的显示），于是上网查资料，看到了：

原地址：http://www.cnblogs.com/shang53880

尚弦月大大的文章，在使用了尚大大的代码后，确实解决了问题，但是在使用过程中，发现了其中的问题，自己做了一些修改，待会将 如何修改、项目源码 在下一篇文章中贴出来：

尚大大的文章：

package com.anddev.ListMore.Test; import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;public class ListMoreTest extends Activity {
ListView lv;
Button btnLeft, btnRight; View.OnClickListener cl; MoreAdapter ma; String[] data = {
"0","1","2","3","4","5","6","7","8","9","10",
"11","12","13","14","15","16","17","18","19","20",
"21","22","23","24","25","26","27","28","29","30",
"31","32","33","34","35","36","37","38","39","40",
"41","42","43","44","45","46","47","48","49","50",
"51","52","53","54","55","56","57","58","59","60",
"61","62","64","64","65","66","67","68","69","70",
"71","72","73","74","75","76","77","78","79","80",
"81","82","83","84","85","86","87","88","89","90",
"91","92","93","94","95","96","97","98","99","100"
}; //用于显示每列5个Item项。
int VIEW_COUNT = 5; //用于显示页号的索引
int index = 0; /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); //加载Listview和2个Button
initView(); //设置ListView的Adapter
ma = new MoreAdapter(this);
lv.setAdapter(ma); cl = new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.btnLeft:
leftView();
break; case R.id.btnRight:
rightView();
break;
}
} }; //添加2个Button的监听事件。
btnLeft.setOnClickListener(cl);
btnRight.setOnClickListener(cl); //检查2个Button是否是可用的
checkButton(); } public void initView(){
lv = (ListView)findViewById(R.id.list); btnLeft = (Button)findViewById(R.id.btnLeft);
btnRight = (Button)findViewById(R.id.btnRight); } //点击左边的Button，表示向前翻页，索引值要减1.
public void leftView(){
index--; //刷新ListView里面的数值。
ma.notifyDataSetChanged(); //检查Button是否可用。
checkButton();
} //点击右边的Button，表示向后翻页，索引值要加1.
public void rightView(){
index++; //刷新ListView里面的数值。
ma.notifyDataSetChanged(); //检查Button是否可用。
checkButton();
} public void checkButton(){
//索引值小于等于0，表示不能向前翻页了，以经到了第一页了。
//将向前翻页的按钮设为不可用。
if(index <=0){
btnLeft.setEnabled(false);
}
//值的长度减去前几页的长度，剩下的就是这一页的长度，如果这一页的长度比View_Count小，表示这是最后的一页了，后面在没有了。
//将向后翻页的按钮设为不可用。
else if(data.length - index*VIEW_COUNT <= VIEW_COUNT){
btnRight.setEnabled(false);
} //否则将2个按钮都设为可用的。
else {
btnLeft.setEnabled(true);
btnRight.setEnabled(true);
} } //ListView的Adapter，这个是关键的导致可以分页的根本原因。
public class MoreAdapter extends BaseAdapter {
Activity activity; public MoreAdapter(Activity a){
activity = a;
} //设置每一页的长度，默认的是View_Count的值。
@Override
public int getCount() {
// TODO Auto-generated method stub
//return data.length; //ori表示到目前为止的前几页的总共的个数。
int ori = VIEW_COUNT * index; //值的总个数-前几页的个数就是这一页要显示的个数，如果比默认的值小，说明这是最后一页，只需显示这么多就可以了
if(data.length - ori < VIEW_COUNT ){
return data.length - ori;
}
//如果比默认的值还要大，说明一页显示不完，还要用换一页显示，这一页用默认的值显示满就可以了。
else {
return VIEW_COUNT;
} } @Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
} @Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
} @Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
//return addTestView(position); TextView tv = new TextView(activity);
tv.setGravity(Gravity.CENTER);
//TextView要显示的是当前的位置+前几页已经显示的位置个数的对应的位置上的值。
tv.setText(data[position+index*VIEW_COUNT]);
return tv; }
}
}

布局文件：

<?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"
>
<ListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
>
<Button android:id="@+id/btnLeft"
android:layout_width="150dip"
android:layout_height="wrap_content"
android:text="@string/textLeft"
/>
<Button android:id="@+id/btnRight"
android:layout_width="150dip"
android:layout_height="wrap_content"
android:text="@string/textRight"
/>
</LinearLayout>
</LinearLayout>