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列表的显示需要三个元素：

1．ListVeiw 用来展示列表的View。

2．适配器用来把数据映射到ListView上的中介。

3．数据具体的将被映射的字符串，图片，或者基本组件。

根据列表的适配器类型，列表分为三种，ArrayAdapter，SimpleAdapter和SimpleCursorAdapter

其中以ArrayAdapter最为简单，只能展示一行字。SimpleAdapter有最好的扩充性，可以自定义出各种效果。 SimpleCursorAdapter可以认为是SimpleAdapter对数据库的简单结合，可以方面的把数据库的内容以列表的形式展示出来。

当数据罗列过多的时候，我们需要Listview分页显示，此时怎么办呢

下面一个简单的例子介绍一下

Java代码

package com.ideasandroid.demo;
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.listview);
//加载Listview和2个Button
initView();
//设置ListView的Adapter
ma = new MoreAdapter(this);
lv.setAdapter(ma);
//此处是双向绑定吗？
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;
}
}
}

package com.ideasandroid.demo;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.listview);                  //加载Listview和2个Button         initView();                  //设置ListView的Adapter         ma = new MoreAdapter(this);         lv.setAdapter(ma);         //此处是双向绑定吗？                          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;                      }     } }

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