Android Image view pixelation

I want to add an ImageView in my application that displays a photo that has a round overlay, so that it appears as a circle rather than a square. However, when I apply the circle overlay, the edge of the circle is pixelated. How can I change my code so that the edge of the circle isn't so jagged.

This is an example of my code at present...

Here is my code...

public Bitmap getRoundedShape(Bitmap bitmap) {
    int targetWidth = 100;
    int targetHeight = 100;
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth,
            targetHeight,Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(targetBitmap);
    Path path = new Path();
    path.addCircle(((float) targetWidth - 1) / 2,
            ((float) targetHeight - 1) / 2,
            (Math.min(((float) targetWidth),
                    ((float) targetHeight)) / 2),
            Path.Direction.CCW);

    canvas.clipPath(path);
    Bitmap sourceBitmap = bitmap;
    canvas.drawBitmap(sourceBitmap,
            new Rect(0, 0, sourceBitmap.getWidth(),
                    sourceBitmap.getHeight()),
            new Rect(0, 0, targetWidth, targetHeight), null);
    return targetBitmap;
}

xml border

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://ift.tt/nIICcg"
android:shape="oval">

<stroke android:width="2dp" android:color="#fff" />
<solid android:color="@android:color/white"/>