Android studio中如何用bitmap将图片设置成圆形？请给出代码

可以使用以下代码将图片设置成圆形：

public Bitmap getCircleBitmap(Bitmap bitmap) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawOval(rectF, paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}

使用方法：

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);
Bitmap circleBitmap = getCircleBitmap(bitmap);
imageView.setImageBitmap(circleBitmap);

其中，`imageView` 是你要显示圆形图片的 `ImageView`。