AndroidUI控件之Gallery实现拖动式图片浏览效果

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
  
  
 

package com.kiritor.ui_gallery; 
 
import android.app.Activity; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.Gallery; 
import android.widget.Toast; 
 
/** 
 * @author 记忆的永恒 
 * 
 */ 
public class MainActivity extends Activity { 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
 
  final Gallery gallery = (Gallery) findViewById(R.id.gallery1); 
  // 将存放图片的ImageAdapter给gallery对象 
  gallery.setAdapter(new ImageAdapter(this)); 
 
  // 设置gallery 的背景图片 
  gallery.setBackgroundResource(R.drawable.first); 
 
  // 设置Gallery的监听事件 
  gallery.setOnItemClickListener(new OnItemClickListener() { 
   @Override 
   public void onItemClick(AdapterView<&＃63;> arg0, View arg1, int arg2, 
     long arg3) { 
    switch (arg2) { 
    case 0: 
     gallery.setBackgroundResource(R.drawable.first); 
     break; 
    case 1: 
     gallery.setBackgroundResource(R.drawable.second); 
     break; 
    case 2: 
     gallery.setBackgroundResource(R.drawable.third); 
     break; 
    case 3: 
     gallery.setBackgroundResource(R.drawable.forth); 
     break; 
    case 4: 
     gallery.setBackgroundResource(R.drawable.fifth); 
     break; 
    default: 
     break; 
    } 
   } 
  }); 
 } 
} 

package com.kiritor.ui_gallery; 
 
import android.content.Context; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.Gallery; 
import android.widget.ImageView; 
 
public class ImageAdapter extends BaseAdapter{ 
 
//定义Content 
private Context mContext; 
//定义一个数组，存放图片资源 
private Integer[] mImageIds = { 
 R.drawable.first, 
 R.drawable.second, 
 R.drawable.third, 
 R.drawable.forth, 
 R.drawable.fifth, 
  
}; 
 
 //构造 
 public ImageAdapter(Context c){ 
 mCOntext= c; 
 } 
 
 //获取图片的个数 
 public int getCount() { 
 // TODO Auto-generated method stub 
 return mImageIds.length; 
 } 
 
 //获取图片在库中的位置 
 public Object getItem(int position) { 
 // TODO Auto-generated method stub 
 return position; 
 } 
 
 //获取图片在库中的ID 
 public long getItemId(int position) { 
 // TODO Auto-generated method stub 
 return position; 
 } 
 
 //将图片取出来 
 public View getView(int position, View convertView, ViewGroup parent) { 
 //要取出图片，即要定义一个ImageView来存 
 ImageView imageView = new ImageView(mContext); 
 imageView.setImageResource(mImageIds[position]); 
 //设置显示比例类型 
 
 
 
 //设置布局图片以105*150显示 （简单解释——设置数字不一样，图片的显示大小不一样） 
 imageView.setLayoutParams(new Gallery.LayoutParams(240, 200)); 
 
 
 imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); 
 return imageView; 
 } 
 
}