Android使用gallery和imageSwitch制作可左右循环滑动的图片浏览器

效果图：

为了使图片浏览器左右无限循环滑动 我们要自定义gallery的adapter

如果要想自定义adapter首先要了解这几个方法

@override 
 public int getcount() { 
  // todo auto-generated method stub 
  return 0; 
 } 

 @override 
 public object getitem(int position) { 
  // todo auto-generated method stub 
  return null; 
 } 

 @override 
 public long getitemid(int position) { 
  // todo auto-generated method stub 
  return 0; 
 } 
 @override 
 public view getview(int position, view convertview, viewgroup parent) { 
  // todo auto-generated method stub 
  return null; 
 } 

其中getcount方法 是返回数据源的数量

getitem方法 返回的是一个object对象 也就是返回目前容器中数据id position所对应的对象

getitemid 返回目前容器中的数据id

getview取得目前要显示的view

如果要实现左右循环滑动 首先我们要返回数据源的数量为最大值 然后把所有数据的id对原本数据源的数量取余  最后设置gallery初始的位置在0-最大值的中间即可

更改后的adapter就是这样

package com.example.imageswitcher; 
import android.content.context; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.baseadapter; 
import android.widget.gallery; 
import android.widget.imageview; 
import android.widget.imageview.scaletype; 

public class myadapter extends baseadapter{ 

 private int id_image[]; 
 private context contex; 
 public myadapter(context contex,int id_image[]) { 
  this.contex=contex; 
  this.id_image=id_image; 
 } 

 @override 
 public int getcount() { 
  // todo auto-generated method stub 
  return integer.max_value; 
 } 

 @override 
 public object getitem(int position) { 
  // todo auto-generated method stub 
  return id_image[position%id_image.length]; 
 } 

 @override 
 public long getitemid(int position) { 
  // todo auto-generated method stub 
  return position%id_image.length; 
 } 

 @override 
 public view getview(int position, view convertview, viewgroup parent) { 
  // todo auto-generated method stub 
  imageview imageview=new imageview(contex); 
  imageview.setbackgroundresource(id_image[position%id_image.length]); 
  imageview.setlayoutparams(new gallery.layoutparams(250, 200)); 
  imageview.setscaletype(scaletype.fit_xy); 
  return imageview; 
 } 
} 

mainactivity

package com.example.imageswitcher; 
import android.os.bundle; 
import android.app.activity; 
import android.view.layoutinflater.factory; 
import android.view.menu; 
import android.view.view; 
import android.view.window; 
import android.view.animation.animationutils; 
import android.widget.adapterview; 
import android.widget.adapterview.onitemselectedlistener; 
import android.widget.gallery; 
import android.widget.imageswitcher; 
import android.widget.imageview; 
import android.widget.imageview.scaletype; 
import android.widget.viewswitcher.viewfactory; 
public class mainactivity extends activity implements onitemselectedlistener,viewfactory{ 
 private imageswitcher imageswitcher; 
 private gallery gallery; 
 private int id_image[] = { r.drawable.beauty1, r.drawable.beauty2, 
   r.drawable.beauty3, r.drawable.beauty4, r.drawable.beauty5, 
   r.drawable.beauty6, r.drawable.beauty7, r.drawable.beauty8, 
   r.drawable.beauty9}; 
 private myadapter myadapter; 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  requestwindowfeature(window.feature_no_title); 
  setcontentview(r.layout.activity_main); 
  gallery = (gallery) findviewbyid(r.id.id_gallery); 
  imageswitcher = (imageswitcher) findviewbyid(r.id.id_imageswitcher); 
  myadapter=new myadapter(this, id_image); 
  imageswitcher.setfactory(this); 
  gallery.setonitemselectedlistener(this); 
  //设置淡入淡出效果 
  imageswitcher.setinanimation(animationutils.loadanimation(this, android.r.anim.fade_in)); 
  imageswitcher.setoutanimation(animationutils.loadanimation(this, android.r.anim.fade_out)); 
  gallery.setadapter(myadapter); 
  //一定不要忘记 设置gallery的初始位置为中间即可 
  gallery.setselection(id_image.length*100); 
 } 
 @override 
 public void onitemselected(adapterview<?> parent, view view, int position, 
   long id) { 
  // todo auto-generated method stub 
  imageswitcher.setbackgroundresource(id_image[position%id_image.length]); 
 } 
 @override 
 public void onnothingselected(adapterview<?> parent) { 
  // todo auto-generated method stub 
 } 
 @override 
 public view makeview() { 
  // todo auto-generated method stub 
  imageview image=new imageview(this); 
  image.setscaletype(scaletype.fit_center); 
  return image; 
 } 
} 

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