Android - Programmatic ImageView scaling

imageViewScaling

/**
 * Create an ImageView with a set height and a scalable width that is scaled based on
 * a provided image.
 * Returns a null ImageView if image was not found.
 */
private ImageView getScaledImageView(String imagePath) {
    int desiredHeightPx = 75;
    ImageView iv = null;
    File imageFile = new File(imagePath);

    if (imageFile.exists()) {
        // create new image view for logo
        iv = new ImageView(getActivity());
        iv.setScaleType(ImageView.ScaleType.CENTER_CROP);

        // get width and height of image
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(imagePath, options);
        int imageWidth = options.outWidth;
        int imageHeight = options.outHeight;

        // calculate vertical scaling required to fit image in heightwise
        float scaleRequired = (desiredHeightPx * 1.0f) / imageHeight;

        // calculate actual width and height of the final view, and create layoutparams for it
        int actualWidth = (int) (imageWidth * scaleRequired);
        int actualHeight = (int) (imageHeight * scaleRequired);

        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(actualWidth, actualHeight);
        iv.setLayoutParams(lp);

        // finally load image into view
        iv.setImageURI(Uri.fromFile(new File(imagePath)));
    }
    else {
        Logging.logger.warn("Creating image view but image file did not exist: "+imagePath);
    }

    return iv;
}