Antialiased rounded corners on Android ImageView

I am new to android dev, and I have been trying for a few hours now to add nice and smooth rounded corners to an ImageView, without success.

First thing I tried is simply to round corners of my images directly, but this implies changing the bitmap, and since I need to keep the raw ones, and those are pretty big, this is not really memory friendly. This would also cause other difficulties since my ImageView is fluid.

Second thing I tried to use is the clipPath method after subclassing my view. This works, but corners are aliased. I then tried adding a PaintFlagsDrawFilter to implement the aliasing, but this didn't worked. I'm using monodroid, and I was wondering this was supposed to work in Java.

Here is my code (C#):

public class MyImageView : ImageView
{
    private float[] roundedCorner;

    /**
     * Contains the rounded  corners for the view.
     * You can define one, four or height values.
     * This behaves as the css border-radius property
     * 
     * @see http://developer.android.com/reference/android/graphics/Path.html#addRoundRect(android.graphics.RectF, float[], android.graphics.Path.Direction)
     */
    public float[] RoundedCorners{
        get{
            return roundedCorner;
        }
        set{
            float[] finalValue = new float[8];
            int i=0;
            if(value.Length == 1){
                for(i=0; i<8;i++){
                    finalValue[i] = value[0];
                }
            }else if(value.Length == 4){
                for(i=0; i<4;i++){
                    finalValue[2*i] = value[i];
                    finalValue[2*i+1] = value[i];
                }
            }

            roundedCorner = finalValue;
        }
    }

    public SquareImageView (Context context) :
        base (context)
    {
        Initialize ();
    }

    public SquareImageView (Context context, IAttributeSet attrs) :
        base (context, attrs)
    {
        Initialize ();
    }