I need to be able to mask an image in my layout to have rounded corners. Is there a simple way to specify an alpha mask in the layout? I would like to avoid having to manually mask each bitmap I'm using.

EDIT

Here is my code, as referenced to the other answer:

HttpURLConnection connection = (HttpURLConnection) this.items.get(position).getIcon().toURL().openConnection();
connection.setDoInput(true);
connection.connect();

Bitmap bitmap = BitmapFactory.decodeStream(connection.getInputStream());

Integer dimension = bitmap.getWidth() > bitmap.getHeight() ? bitmap.getWidth() :
        bitmap.getHeight();

Bitmap rounder = Bitmap.createBitmap(dimension, dimension, Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(rounder);

Paint painter = new Paint(Paint.ANTI_ALIAS_FLAG);
painter.setColor(Color.RED);

canvas.drawRoundRect(new RectF开发者_运维技巧(0, 0, dimension, dimension), 
        20.0F, 20.0F, painter);

painter.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));

canvas.drawBitmap(bitmap, 0, 0, null);
canvas.drawBitmap(rounder, 0, 0, painter);

holder.image.setImageBitmap(bitmap);

However, this doesn't work. I don't see see rounded corners, I see the regular image as-is. Is there a step at the end I'm missing that involves the canvas?

Looks like your question was answered before, perhaps this might help?

There are a few ways you could acomplish this . I would make a nine patch that is transparent except for the corners and draw that on top of the images.