자바파일ㄹ

public class ProfessorClass extends Activity{
 public void onCreate(Bundle icicle) {
  super.onCreate(icicle);
  this.requestWindowFeature(Window.FEATURE_NO_TITLE); //정보안나옴!
  setContentView(R.layout.professorclass); 
   GridView gridview = (GridView) findViewById(R.id.professorclass); 
   gridview.setAdapter(new ImageAdapter(this)); 
  gridview.setOnItemClickListener(new OnItemClickListener() { 
         public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 
            // Toast.makeText(getApplicationContext(),"이그림을 선택하셨습니다." + position, Toast.LENGTH_SHORT).show();
          
         } 
     });   
 }
 
 public class ImageAdapter extends BaseAdapter { 
     private Context mContext; 
  
     public ImageAdapter(Context c) { 
         mContext = c; 
     } 
  
     public int getCount() { 
         return mThumbIds.length; 
     } 
  
     public Object getItem(int position) { 
         return null; 
     } 
  
     public long getItemId(int position) { 
         return 0; 
     } 
  
     // create a new ImageView for each item referenced by the Adapter 
     public View getView(int position, View convertView, ViewGroup parent) { 
         ImageView imageView; 
         if (convertView == null) {  // if it's not recycled, initialize some attributes 
             imageView = new ImageView(mContext); 
             imageView.setLayoutParams(new GridView.LayoutParams(150, 150)); 
             imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
             imageView.setPadding(5, 5, 5, 5); 
         } else { 
             imageView = (ImageView) convertView; 
         } 
  
         imageView.setImageResource(mThumbIds[position]); 
         return imageView; 
     } 
  
     // references to our images 
     private Integer[] mThumbIds = { 
       R.drawable.kunsan, R.drawable.notice, 
             R.drawable.notice, R.drawable.notice, 
             R.drawable.notice, R.drawable.notice, 
             R.drawable.notice, R.drawable.notice, 
             R.drawable.notice, R.drawable.notice, 
             R.drawable.notice, R.drawable.notice,
             R.drawable.notice
            
     }; 
 } 
}
레이아웃부분!
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff" > 
 
 
    
<GridView  
    android:id="@+id/professorclass" 
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent" 
    android:columnWidth="90dp" 
    android:numColumns="auto_fit" 
    android:verticalSpacing="10dp" 
    android:horizontalSpacing="10dp" 
    android:stretchMode="columnWidth" 
    android:gravity="center" 
/>
 
</LinearLayout>
지금 이러면 사진들이 그리드뷰에 나타나는데요! 이걸 사진을 클릭시 사진이뜨고 아래로는 스크롤나오고 텍스트설명이 나오게 하고 싶습니다. 그리고 다른사진을 클릭하면 사진도 바뀌고 텍스트설명도 바뀌게 하고 싶습니다. 어떻게 해야하는지 알려주세요!