Android Remote Gallery

public class GalleryActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gallery);

        final List<String> urls = getUrls(); // get your urls here
        final List<Bitmap> images = new ArrayList<Bitmap>();

        final ViewPager viewPager = (ViewPager)findViewById(R.id.pager);
        viewPager.setAdapter(new ImagesAdapter(images));
        final ProgressDialog dialog = new ProgressDialog(this);
        dialog.setMessage("Images are beeing loaded...");
        dialog.show();

        final Handler downloadFinished = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                dialog.hide();
                viewPager.getAdapter().notifyDataSetChanged();
            }
        };

        new Thread() {
            public void run() {
                for (String urlString : urls) {
                    try {
                        URL url = new URL(urlString);
                        URLConnection conn = url.openConnection();
                        conn.connect();
                        InputStream is = conn.getInputStream();
                        BufferedInputStream bis = new BufferedInputStream(is);
                        images.add(BitmapFactory.decodeStream(bis));
                        bis.close();
                        is.close();
                    } catch (MalformedURLException e) {
                        dialog.hide();
                        e.printStackTrace();
                    } catch (IOException e) {
                        dialog.hide();
                        e.printStackTrace();
                    }
                }
                downloadFinished.sendEmptyMessage(Thread.NORM_PRIORITY);
            };
        }.start();
    }

    class ImagesAdapter extends PagerAdapter {

        private List<Bitmap> _images;

        public ImagesAdapter(List<Bitmap> images) {
            _images = images;
        }

        @Override
        public void startUpdate(View arg0) {
        }

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == ((RelativeLayout) object);
        }

        @Override
        public Object instantiateItem(View viewPager, int position) {
            LayoutInflater inflater = (LayoutInflater)GalleryActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View container = inflater.inflate(R.layout.fullscreen_image, (ViewGroup)viewPager, false);
            ImageView image = (ImageView) container.findViewById(R.id.imgDisplay);
            image.setImageBitmap(_images.get(position));
            ((ViewPager) viewPager).addView(container);

            return container;
        }

        @Override
        public int getCount() {
            return _images.size();
        }

        @Override
        public void finishUpdate(View arg0) {
        }

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

...
<android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
...

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/imgDisplay"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="fitCenter" />

</RelativeLayout>