Android: Image gallery with preview left and right and landscape and portrait images

I finally figured out how I wanted it. I finally succeeded in doing this while using a ViewPager:

GalleryAdapter:

public class GalleryAdapter extends PagerAdapter {

/**
 * The collection of images contained in the view pager.
 */
public Integer[] mImages;

private InternalDatabase dbhelper;
private RuntimeExceptionDao<GalleryImage, Integer> imagesDao;

/**
 * Constructor for the adapter. Initializes the images needed.
 */
public GalleryAdapter(Context context, Integer[] galleryImages) {

    dbhelper = OpenHelperManager.getHelper(context, InternalDatabase.class);
    imagesDao = dbhelper.getRuntimeExceptionDao(GalleryImage.class);

    // TODO: create the proper collection to be able to display the images in the collection.
    mImages = galleryImages;

}

@Override
public int getCount() {
    if (mImages != null) {
        if (mImages.length > 0) {
            return mImages.length;
        }
    }
    return 0;
}

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

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

    // Get the context from which the adapter is created.
    // Need the context to create new views.
    Context context = container.getContext();

    // Create a new image view that will contain the image.
    ImageView imageView = new ImageView(context);

    LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    imageView.setLayoutParams(params);

    // Scaling the image inside the wrapping view pager.
    //imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);

    // Setting the image.
    if (mImages != null) {

        if (mImages.length > 0) {

            Integer id = mImages[position];
            GalleryImage image = imagesDao.queryForId(id);

            Bitmap decodedByte = BitmapFactory.decodeByteArray(image.getImage(), 0, image.getImage().length); 
            imageView.setImageBitmap(decodedByte);

        }

    }

    // Add the image to the view pager.
    ((ViewPager) container).addView(imageView);
    return imageView;
}

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

LinearLayout view:

public class CardMiniatureGallery extends AbstractCompoundLinearLayout {

/**
 * The viewpager that is used as a miniature gallery.
 */
public ViewPager mGallery;

private Integer[] mIDs;

public CardMiniatureGallery(Context context) {
    super(context);
}

public CardMiniatureGallery(Context context, Integer[] images) {
    super(context);
    mIDs = images;

    createLayout(context, mIDs);
}

public CardMiniatureGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
    createLayout(context, mIDs);
}

public CardMiniatureGallery(Context context, AttributeSet attrs,
        int defStyle) {
    super(context, attrs, defStyle);
    createLayout(context, mIDs);
}

protected void createLayout(Context context) {

    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    inflater.inflate(R.layout.card_miniature_gallery, this, true);

}

private void createLayout(Context context, Integer[] ids) {

    mGallery = (ViewPager) getChildAt(0);

    GalleryAdapter adapter = new GalleryAdapter(context, mIDs);
    mGallery.setAdapter(adapter);
    mGallery.setOffscreenPageLimit(adapter.getCount());
    mGallery.setClipToPadding(false);

    int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 43, getResources().getDisplayMetrics());
    mGallery.setPageMargin(margin);

}

}

Layout:

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

<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_gravity="center"
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:overScrollMode="never"
    android:paddingLeft="85dp"
    android:paddingRight="85dp"
    android:layout_marginBottom="@dimen/padding_medium" />

With these classes and an array of Integers which I use to fetch the data from the database, I can display the images as I want. Now I only have to figure out how to dynamically set the ViewPager height by looking at the images it has to load.