Android实现滑动加载数据的方法

本文实例讲述了android实现滑动加载数据的方法。分享给大家供大家参考。具体实现方法如下：

endlessactivity.java如下：

package com.scrolllistview;
import android.app.listactivity;
import android.os.bundle;
import android.view.gravity;
import android.view.view;
import android.view.viewgroup;
import android.widget.abslistview;
import android.widget.baseadapter;
import android.widget.linearlayout;
import android.widget.progressbar;
import android.widget.textview;
import android.widget.abslistview.onscrolllistener;
public class endlessactivity extends listactivity implements onscrolllistener {
 aleph0 adapter = new aleph0();
  int mprogressstatus = 0 ;
 progressbar progressbar;
  protected void oncreate(bundle savedinstancestate) {
   super .oncreate(savedinstancestate);
  linearlayout searchlayout = new linearlayout( this );
  searchlayout.setorientation(linearlayout.horizontal);
    progressbar = new progressbar( this );
    progressbar.setpadding( 0 , 0 , 15 , 0 );
    searchlayout.addview(progressbar, new linearlayout.layoutparams(
    linearlayout.layoutparams.wrap_content,
    linearlayout.layoutparams.wrap_content
    ));
    textview textview = new textview( this );
    textview.settext( " 加载中... " );
    textview.setgravity(gravity.center_vertical);
    searchlayout.addview(textview, new linearlayout.layoutparams(
    linearlayout.layoutparams.fill_parent,
    linearlayout.layoutparams.fill_parent
    ));
    searchlayout.setgravity(gravity.center);
    linearlayout loadinglayout = new linearlayout( this );
    loadinglayout.addview(searchlayout, new linearlayout.layoutparams(
    linearlayout.layoutparams.wrap_content,
    linearlayout.layoutparams.wrap_content
    ));
    loadinglayout.setgravity(gravity.center);
    getlistview().addfooterview(loadinglayout);
  setlistadapter(adapter); 
  getlistview().setonscrolllistener( this );
 }
  public void onscroll(abslistview view,
   int firstvisible, int visiblecount, int totalcount) {
   boolean loadmore = /* maybe add a padding */
   firstvisible + visiblecount >= totalcount;
   if (loadmore) {
   adapter.count += visiblecount; // or any other amount 
   adapter.notifydatasetchanged();
  }
 }
  public void onscrollstatechanged(abslistview v, int s) { } 
  class aleph0 extends baseadapter {
   int count = 40 ; /* starting amount */
   public int getcount() { return count; }
   public object getitem( int pos) { return pos; }
   public long getitemid( int pos) { return pos; }
   public view getview( int pos, view v, viewgroup p) {
    textview view = new textview(endlessactivity. this );
    view.settext( " entry " + pos);
     return view;
  }
 }
}

listview下部是按钮控制：

package com.scrolllistview;
import android.app.listactivity;
import android.os.bundle;
import android.view.gravity;
import android.view.view;
import android.view.viewgroup;
import android.widget.abslistview;
import android.widget.baseadapter;
import android.widget.button;
import android.widget.linearlayout;
import android.widget.progressbar;
import android.widget.textview;
import android.widget.abslistview.onscrolllistener;
public class endlessactivity extends listactivity {
 aleph0 adapter = new aleph0();
  int mprogressstatus = 0 ;
  protected void oncreate(bundle savedinstancestate) {
   super .oncreate(savedinstancestate);
  linearlayout searchlayout = new linearlayout( this );
  searchlayout.setorientation(linearlayout.horizontal);
    button textview = new button( this );
    textview.settext( " 加载中... " );
    textview.setgravity(gravity.center_vertical);
    searchlayout.addview(textview, new linearlayout.layoutparams(
    linearlayout.layoutparams.fill_parent,
    linearlayout.layoutparams.fill_parent
    ));
    searchlayout.setgravity(gravity.center);
    linearlayout loadinglayout = new linearlayout( this );
    loadinglayout.addview(searchlayout, new linearlayout.layoutparams(
    linearlayout.layoutparams.wrap_content,
    linearlayout.layoutparams.wrap_content
    ));
    loadinglayout.setgravity(gravity.center);
    getlistview().addfooterview(loadinglayout);
    textview.setonclicklistener( new button.onclicklistener()
    {  @override 
     public void onclick(view v) 
    {  
     adapter.count += 10 ; 
     adapter.notifydatasetchanged();
     }  
    }); 
  setlistadapter(adapter); 
   // getlistview().setonscrolllistener(this); 
 }
 /* public void onscroll(abslistview view,
  int firstvisible, int visiblecount, int totalcount) {
  boolean loadmore = 
   firstvisible + visiblecount >= totalcount;
  if(loadmore) {
   adapter.count += visiblecount; 
   adapter.notifydatasetchanged();
  }
 } */
  public void onscrollstatechanged(abslistview v, int s) { } 
  class aleph0 extends baseadapter {
   int count = 40 ; /* starting amount */
   public int getcount() { return count; }
   public object getitem( int pos) { return pos; }
   public long getitemid( int pos) { return pos; }
   public view getview( int pos, view v, viewgroup p) {
    textview view = new textview(endlessactivity. this );
    view.settext( " entry " + pos);
     return view;
  }
 }
}

希望本文所述对大家的android程序设计有所帮助。