Marker marker = aMap.addMarker(new MarkerOptions()
					.anchor(0.5f,0.5f)
					.position(new LatLng(lat.get(i)[0],lat.get(i)[1]))
					.snippet("nnn").title(i + "").snippet(i + "")

					.draggable(true));

			String imageUrl = "http://img01.taobaocdn.com/bao/uploaded/i3/13215023749568975/T1UKWCXvpXXXXXXXXX_!!0-item_pic.jpg_230x230.jpg";

			View view = LayoutInflater.from(getActivity()).inflate(
					R.layout.marker,null);
			ImageView imageView = (ImageView) view.findViewById(R.id.iv);
			mAbImageDownloader.display(imageView,imageUrl);
			marker.setIcon(BitmapDescriptorFactory.fromView(view));

加载的是网络图片 因为之前有人说自定义的marker设置icon时不能使用网络的图片

自己写的xml里可以设置各种样式的Marker