lazy loading

//package

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Vector;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class PhotoGallerry extends Activity {

private Gallery gallery;
private ImageView imgView;
// HashMap hv;
Vector<Photos> vPhotos;

// String[] thumb_url;
// String[] big_url;
// Bitmap[] bitmap;
// Bitmap[] bitmap_big;
// int[] flag;
// Information information =new Information();
Photos photos = new Photos();
Button back;

@SuppressWarnings("unused")
@Override
public void onCreate(Bundle savedInstanceState)
 {
super.onCreate(savedInstanceState);

System.out.println("On create start");

Bundle bundel = getIntent().getExtras();
vPhotos = new Vector<Photos>();
vPhotos = Photos.vPhotos;

/* if(bundel!=null) vPhotos = (Vector<Photos>)bundel.get("hash_photo");
 * else System.out.println("Hash Size------------" + vPhotos.size());
 */
// photos.thumburl = new String();
// photos.bigurl = new String();
// photos.t_bitmap = new Bitmap;
// photos.b_bitmap = new Bitmap[vPhotos.size()];
// System.out.println("SSSize"+ photos.bitmap.length );
// flag = new int[vPhotos.size()];



for (int index = 0; index < vPhotos.size(); index++)
 {
Photos photos = (Photos) vPhotos.elementAt(index);
/*if (photos.t_bitmap == null)
 {
photos.thumburl = photos.thumburl;
photos.bigurl = photos.bigurl;
photos.t_bitmap = DownloadImage(photos.thumburl);
// bitmap_big[id] = DownloadImage(big_url[id]);
System.out.println("in class photos" + photos.t_bitmap);
 }*/

setContentView(R.layout.photos);
gallery = (Gallery) findViewById(R.id.examplegallery);
gallery.setAdapter(new AddImgAdp(this));
}

Photos.vPhotos = vPhotos;
imgView = (ImageView) findViewById(R.id.ImageView01);
photos.b_bitmap = DownloadImage(photos.bigurl);
imgView.setImageBitmap(photos.b_bitmap);

back = (Button) findViewById(R.id.btnback);
back.setOnClickListener(new View.OnClickListener()
 {
public void onClick(View v)
 {
Intent intent = new Intent(PhotoGallerry.this, Testpage.class);
System.out.println("in intent");
startActivity(intent);
setResult(RESULT_OK, intent);
finish();
 }
});
gallery.setOnItemClickListener(new OnItemClickListener() {
@SuppressWarnings("rawtypes")
public void onItemClick(AdapterView parent, View v, int position,
long id) {
Photos photos = (Photos) vPhotos.elementAt(position);
 final ImageDownloader imageDownloader = new ImageDownloader();
 int no=2;

 imgView.setScaleType(ScaleType.FIT_XY);
imgView.setImageBitmap(photos.t_bitmap);


if (photos.b_bitmap == null) {

  imageDownloader.download(photos, (ImageView) imgView, no);
 // imgView.setScaleType(ScaleType.CENTER_INSIDE);
// photos.b_bitmap = DownloadImage(photos.bigurl);
// imgView.setImageBitmap(photos.b_bitmap);

} else {
 imgView.setScaleType(ScaleType.CENTER_INSIDE);
imgView.setImageBitmap(photos.b_bitmap);
}
// imgView.setImageBitmap(photos.b_bitmap);

}
});

System.out.println("On create end");

}

private InputStream OpenHttpConnection(String urlString) throws IOException {
InputStream in = null;
int response = -1;

URL url = new URL(urlString);
URLConnection conn = url.openConnection();

if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");

try {
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();

response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
} catch (Exception ex) {
throw new IOException("Error connecting");
}
return in;
}

Bitmap DownloadImage(String URL) {
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in);
in.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return bitmap;
}

public class AddImgAdp extends BaseAdapter {
int GalItemBg;
private Context cont;
 private final ImageDownloader imageDownloader = new ImageDownloader();

public AddImgAdp(Context c) {
cont = c;
TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
GalItemBg = typArray.getResourceId(
R.styleable.GalleryTheme_android_galleryItemBackground, 0);
typArray.recycle();
}

public int getCount() {
return vPhotos.size();
}

public Object getItem(int position) {
return position;
}

public long getItemId(int position) {
return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
int no=1;
System.out.println("getView called");
Photos p = vPhotos.elementAt(position);
ImageView imgView = new ImageView(cont);

imgView.setLayoutParams(new Gallery.LayoutParams(100, 100));
imgView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imgView.setBackgroundResource(GalItemBg);

  imageDownloader.download(p, (ImageView) imgView, no);
return imgView;
}
}

}