그리드뷰를 뿌리고 싶은데 리스트에껀 다뿌려주는데 읽어오는데 버벅거립니다. 어떡해 수정을 해야댈지 가르켜주시면 감사하겟습니다.

배운지 한달도 안되서 잘모릅니다....

public class Gallery extends Activity {
 
 List<Integer> iList = new ArrayList<Integer>();
 Intent intent;
 private ImageAdapter ia;
 private GridView gri; 
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gallery);       
       
        gri = (GridView)findViewById(R.id.gri);
        ia = new ImageAdapter(this);
        gri.setAdapter(ia);
        gri.setOnItemClickListener(new OnItemClickListener(){

   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
   
    Intent intent = new Intent(Gallery.this, Gallery_1.class);
    intent.putExtra("picture ID", iList.get(position));
    startActivity(intent);
   }
      
     });
   
    }
    public class ImageAdapter extends BaseAdapter{
     private List listImages;           
     Context context;

     public ImageAdapter (Context context){
            this.context = context; 
           
            for(int i=1; i<=24; i++)
            {
                iList.add(getResources().getIdentifier("g_"+i, "drawable", getPackageName()));
               }
      }

     public int getCount() {

      return iList.size();
      
     }

     public Object getItem(int position) {

      return (null != iList) ? iList.get(position) : 0;

     }
     
     public long getItemId(int position) {

      return position;
     }

     public View getView(int position, View convertView, ViewGroup parent) {
      ImageView imageView;
      
      if(convertView == null) {
       
       imageView = new ImageView(context);
             imageView.setAdjustViewBounds(true);
             
             
             
      }
      else
   {
    imageView = (ImageView) convertView;
   }
      Bitmap bmp = BitmapFactory.decodeResource(context.getResources(), iList.get(position));
         bmp = Bitmap.createScaledBitmap(bmp, 320, 400, false);
         imageView.setImageBitmap(bmp);
            return imageView;
         
            }
     }

   
}