图片转成圆角显示

1. ImageView image;
image=(ImageView)findViewById(R.id.image);
Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.farm);
Bitmap bitmpa=toRoundCorner(bmp,5);
image.setImageBitmap(bitmpa);
2.public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {

       Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
                .getHeight(), 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);
        final float roundPx = pixels;

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
    
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); 
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
    }