package com.android.coding;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.Gallery.LayoutParams;import android.widget.ViewSwitcher.ViewFactory;import android.widget.ImageSwitcher;import android.widget.ImageView;public class ViewPicturesActivity extends Activity { ImageSwitcher imageSwitcher; //聲明ImageSwitcher對象，圖片顯示區域 Gallery gallery;       //聲明Gallery對象，圖片列表索引 int imagePosition;      //標記圖片數組下標，用于循環顯示 //聲明圖片整型數組 private int[] images = {  R.drawable.image1,R.drawable.image2,  R.drawable.image3,R.drawable.image4,  R.drawable.image5,R.drawable.image6,  R.drawable.image7,R.drawable.image8,  R.drawable.image9,R.drawable.image10,  R.drawable.image11,R.drawable.image12,  R.drawable.image13,R.drawable.image14,  R.drawable.image15,R.drawable.image16,  R.drawable.image17};   @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    //通過控件的ID獲得imageSwitcher的對象    imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher);    //設置自定義的圖片顯示工廠類    imageSwitcher.setFactory(new MyViewFactory(this));    //通過控件的ID獲得gallery的對象    gallery = (Gallery) findViewById(R.id.gallery);    //設置自定義的圖片適配器    gallery.setAdapter(new ImageAdapter(this));     //實現被選中的事件監聽器    gallery.setOnItemSelectedListener(new OnItemSelectedListener() {          @Override  public void onItemSelected(AdapterView<?> parent, View view,   int position, long id) {  //通過求余數，循環顯示圖片  imageSwitcher.setImageResource(images[position%images.length]);    }  @Override  public void onNothingSelected(AdapterView<?> parent) {  // TODO Auto-generated method stub    } });      }    //自定義圖片適配器，繼承BaseAdapter  class ImageAdapter extends BaseAdapter{    private Context context; //定義上下文  //參數為上下文的構造方法 public ImageAdapter(Context context) {  this.context = context; }    //得到圖片的大小 @Override public int getCount() {  //設置為整型的最大數  return Integer.MAX_VALUE; } //得到指定圖片的對象 @Override public Object getItem(int position) {    return null; }  //得到指定圖片的對象的ID @Override public long getItemId(int position) {    return 0; } //顯示圖標列表 @Override public View getView(int position, View convertView, ViewGroup parent) {  ImageView iv = new ImageView(context); //創建ImageView對象  iv.setImageResource(images[position%images.length]);  //設置循環顯示圖片  iv.setAdjustViewBounds(true); //圖片自動調整顯示  //設置圖片的寬和高  iv.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));  return iv; //返回ImageView對象 }     }    //自定義圖片顯示工廠類，繼承ViewFactory  class MyViewFactory implements ViewFactory{ private Context context; //定義上下文  //參數為上下文的構造方法 public MyViewFactory(Context context) {  this.context = context; } //顯示圖標區域   @Override public View makeView() {  ImageView iv = new ImageView(context); //創建ImageView對象  iv.setScaleType(ImageView.ScaleType.FIT_CENTER); //圖片自動居中顯示  //設置圖片的寬和高  iv.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));  return iv; //返回ImageView對象 }     }  }