//第一種

Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.head);

RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(getResources(),bitmap);

drawable.setCircular(true);?

//第二種

Bitmapbitmap = BitmapFactory.decodeResource(getResources(),R.drawable.head);

?BitmapShader bitmapShader =newBitmapShader(bitmap,Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);

?Paint paint =newPaint();

?paint.setShader(bitmapShader);canvas.drawCircle(500,250,200,paint);?

canvas.drawCircle(500,250,200,paint);?