ScaleImageHeight

    public static Point scaleImageHeightForScreen(Activity ctx, int imageId) {

        // Ref: http://andrew.hedges.name/experiments/aspect_ratio/

        BitmapDrawable bd=(BitmapDrawable) ctx.getResources().getDrawable(imageId);

        int imgHeight = bd.getBitmap().getHeight();
        int imgWidth = bd.getBitmap().getWidth();


        int scrWidth = 0;

        WindowManager w = ctx.getWindowManager();

        Display d = w.getDefaultDisplay();

        scrWidth = d.getWidth();

        double calcHeight = ((double)imgHeight / imgWidth) * scrWidth;

        return new Point(scrWidth, (int)calcHeight);

    }