How to properly resize imageview on all screens?

I'm making mini bookmarks application. The idea is to populate the relative layout with favicons of sites that are stored in browser's bookmark database. I extracted blob images from the database and converted them to drawables using Drawable.createFromStream method. How can I properly sizeup those imageviews because currently they are very small? Another problem that I have is the relative layout. How can I properly populate the horizontal area with icons so when it reaches end of screen they go in new line?

Here's my code:

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

    ScrollView scrollView = new ScrollView(this);
    RelativeLayout relativeLayout = new RelativeLayout(this);
    ImageView bookmark;

    scrollView.addView(relativeLayout);

    this.startManagingCursor(cursor);
    Uri Bookmarks = Browser.BOOKMARKS_URI;

    cursor = managedQuery(
            Bookmarks, projection, selection, null, Browser.BookmarkColumns.VISITS + " DESC");

    if (cursor.moveToFirst()) {
        int idCounter = 1;
        ByteArrayInputStream blobImage;

        do{
           bookmark = new ImageView(this);
           bookmark.setId(idCounter++);

           blobImage = new ByteArrayInputStream(
                   cursor.getBlob(cursor.getColumnIndex(BookmarkColumns.FAVICON)));

           bookmark.setImageDrawable(
                   Drawable.createFromStream(blobImage, "" + bookmark.getId()));

           RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                   LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

           if(idCounter > 1) {
               params.addRule(RelativeLayout.BELOW, bookmark.getId() - 1);
           }

           relativeLayout.addView(bookmark, params);
        } while (cursor.moveToNext());
     } 

    this.setContentVi开发者_运维技巧ew(scrollView);
}

}

There are a number of ways you can approach what you're trying to do.

But ImageViews have a scale type, so the image can be forced to scale up but maintain ratio or scale up so the entire view is filled

http://developer.android.com/reference/android/widget/ImageView.ScaleType.html

In terms of filling the screen, you'll need to determine either the number of icons per row OR dynamically decide the number of them and size them.