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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