RoundedImageView.java 文件源码

private Bitmap getRoundedCroppedBitmap(Bitmap bitmap, int radius) {
    Bitmap finalBitmap;

    if (bitmap.getWidth() != radius || bitmap.getHeight() != radius) {
        finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius, false);
    } else {
        finalBitmap = bitmap;
    }

    Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
            finalBitmap.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
            finalBitmap.getHeight());

    paint.setAntiAlias(true);
    paint.setFilterBitmap(true);
    paint.setDither(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(Color.parseColor("#BAB399"));
    canvas.drawCircle(finalBitmap.getWidth() / 2,
            finalBitmap.getHeight() / 2,
            finalBitmap.getWidth() / 2, paint);
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(finalBitmap, rect, rect, paint);

    return output;
}