用gallery展示圖片，實現中間圖片稍大，兩邊較小的效果

 

實現原理：在onItemSelected事件中，選中galerry中的圖片時，把選中的圖片放大，把沒有選中的縮小。

以下是關鍵代碼

 
           1      
          public  
          void onItemSelected(AdapterView<?> parent, View view,  
          int position, 
          
 
           2              
          long id) { 
          
 
           3          
          // 
           選中Gallery中某個圖像時，放大顯示該圖像 
          
 
           4  
                  ImageView imageview = (ImageView)view; 
          
 
           5         ((ImageView) view).setImageDrawable((Drawable) product_image_list.get(position)); 
          
 
           6         view.setLayoutParams( 
          new Gallery.LayoutParams(520 / 2, 318 / 2)); 
          
 
           7         title.setText((String)product_title.get(position)); 
          
 
           8         info.setText((String)product_info.get(position)); 
          
 
           9          
          for( 
          int i=0; i<parent.getChildCount();i++){ 
          
 
          10              
          // 
          縮小選中圖片旁邊的圖片 
          
 
          11  
                      ImageView local_imageview = (ImageView)parent.getChildAt(i); 
          
 
          12              
          if(local_imageview!=imageview){ 
          
 
          13                 local_imageview.setLayoutParams( 
          new Gallery.LayoutParams(520/4, 318/4)); 
          
 
          14                 local_imageview.setScaleType(ImageView.ScaleType.FIT_CENTER); 
          
 
          15             } 
          
 
          16         } 
          
 
          17     } 
          
 
          18      
          
 
          19      
          public  
          void onNothingSelected(AdapterView<?> parent) 
          
 
          20     { 
          
 
          21     } 
          
 
          22      
          
 
          23      
          public  
          class ImageAdapter  
          extends BaseAdapter 
          
 
          24     { 
          
 
          25          
          int mGalleryItemBackground; 
          
 
          26          
          private Context mContext; 
          
 
          27  
          
 
          28          
          public ImageAdapter(Context context) 
          
 
          29         { 
          
 
          30             mContext = context; 
          
 
          31  
          // 
                      TypedArray typedArray = obtainStyledAttributes(R.styleable.Gallery);
 
          32  
           
          // 
                      mGalleryItemBackground = typedArray.getResourceId(
 
          33  
           
          // 
                              R.styleable.Gallery_android_galleryItemBackground, 0);                         
          
 
          34  
                  } 
          
 
          35          
          
 
          36          
          public  
          int getCount() 
          
 
          37         { 
          
 
          38              
          return product_image_list.size(); 
          
 
          39         } 
          
 
          40  
          
 
          41          
          public Object getItem( 
          int position) 
          
 
          42         { 
          
 
          43              
          return position; 
          
 
          44         } 
          
 
          45  
          
 
          46          
          public  
          long getItemId( 
          int position) 
          
 
          47         { 
          
 
          48              
          return position; 
          
 
          49         } 
          
 
          50   
          
 
          51          
          public View getView( 
          int position, View convertView, ViewGroup parent) 
          
 
          52         { 
          
 
          53             ImageView imageView =  
          new ImageView(mContext); 
          
 
          54             imageView.setLayoutParams( 
          new Gallery.LayoutParams(520/4, 318/4));//默認都是大圖 
          
 
          55             imageView.setImageDrawable((Drawable) product_image_list.get(position)); 
          
 
          56             imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); 
          
 
          57              
          return imageView; 
          
 
          58         } 
          
 
          59     }