Android 将assets 下面的图片，显示成圆形或者圆角

将assets 下面的图片，显示成圆形显示

//将assets 下面的图片，显示成圆形显示
try{
                final InputStream is = getResources().getAssets().open("photo_default.jpg");
                Bitmap bitmap = BitmapFactory.decodeStream(is);
                bitmap=getCircleBitmap(bitmap);
                image_view_head.setImageBitmap(bitmap);
            }catch (Exception e){
                e.printStackTrace();
            }

//圆角图片
public static Bitmap getRoundBitmap(Bitmap bit) {
        Bitmap bitmap = Bitmap.createBitmap(bit.getWidth(), bit.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(Color.YELLOW);
        // 绘制作为基准的圆角矩形
        RectF rect = new RectF(0, 0, bit.getWidth(), bit.getHeight());
        canvas.drawRoundRect(rect, 15, 15, paint);// 画圆角矩形
        // 设置相交保留
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bit, 0, 0, paint);
        return bitmap;
    }
//圆形图片
    public static Bitmap getCircleBitmap(Bitmap bit) {
        Bitmap bitmap = Bitmap.createBitmap(bit.getWidth(), bit.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);//传入参数后canvas的操作会影响图片
        Paint paint = new Paint();
        paint.setAntiAlias(true);// 设置抗锯齿
        paint.setColor(Color.YELLOW);
        int radius = bitmap.getWidth()>bitmap.getHeight()?bitmap.getHeight():bitmap.getWidth();// 将较短的那一条边作为直径
        canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2, radius / 2, paint);// 在图片中心画以radius/2为半径的圆形
        // 设置相交保留且图片部分显示
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        // 绘制图片
        canvas.drawBitmap(bit, 0, 0, paint);
        return bitmap;
    }