Scroll of Grid View in android

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class GridViewDemo extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        GridView gridView=(GridView)findViewById(R.id.gridView);
        String selection = MediaStore.Images.Thumbnails.KIND + "="  + // Select only mini's
        MediaStore.Images.Thumbnails.MINI_KIND;

        Cursor cursor=managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, null, selection, null, null);
       
        cursor.moveToFirst();
        gridAdapter gAdapter=new gridAdapter(getApplicationContext(), cursor);
        gridView.setAdapter(gAdapter);
    }
    
    class gridAdapter extends BaseAdapter{
    	Context context;
    	Cursor cursor;
    	LayoutInflater inflater;
    	public gridAdapter(Context context,Cursor cursor){
    		this.context=context;
    		this.cursor=cursor;
    		inflater=LayoutInflater.from(context);
    	}
    	
		@Override
		public int getCount() {
			return cursor.getCount();
		}

		@Override
		public Object getItem(int arg0) {
			return cursor.getString(cursor.getColumnIndex(MediaStore.Images.Thumbnails.DATA));
		}

		@Override
		public long getItemId(int arg0) {
			return arg0;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView img;
			cursor.moveToPosition(position);
			String path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Thumbnails.DATA));
			if(convertView==null){
				img=new ImageView(context);
				img.setLayoutParams(new GridView.LayoutParams(90, 90));

				convertView=img;
				String pathStr=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Thumbnails.DATA));
				((ImageView)convertView).setImageURI(Uri.parse(pathStr));
			}else{
				String pathStr=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Thumbnails.DATA));
				((ImageView)convertView).setImageURI(Uri.parse(pathStr));
			}
			return convertView;
		}
    	
    }
}


       main.xml

<?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"
    >
<GridView  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/gridView"
    android:numColumns="auto_fit"
	android:columnWidth="90dip"
	android:horizontalSpacing="0dip"></GridView>
</LinearLayout>

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