Android swipe adaptor loading images from sdcard

SwipeAdaptor

import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class SwipeAdaptor extends PagerAdapter{

		Context context;		
		int columnIndex;

		public SwipeAdaptor(Context context) {
			this.context = context;						
		}

		private void initCursor(){
		String[] projection = { MediaStore.Images.Thumbnails._ID };		
		this.cursor = getApplicationContext().getContentResolver().query(
				MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection,null,null, MediaStore.Images.Thumbnails.IMAGE_ID);
		this.columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
		}
		
		
		@Override
		public int getCount() {

			return cursor.getCount();
		}

		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {

			return arg0 == ((View) arg1);
		}

		@Override
		public Object instantiateItem(ViewGroup container, int position) {

			ImageView iv = new ImageView(context);
			
			// imleci bulunduğu indexe ilerletiyor.
			cursor.moveToPosition(position);
			int imageID = cursor.getInt(columnIndex);

			// sorgudan bulunan sonucu resime baglıyor.
			iv.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID));
			((ViewPager) container).addView(iv);
			return iv;
		}

		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			((ViewPager) container).removeView((View) object);
		}

	}