NetworkImageView 设置默认图片

原文地址:http://stackoverflow.com/questions/21567055/display-networkimageviews-default-image-without-network-request

The problem is that even if a default image is set, it won't be displayed until one calls setImageUrl(), which in turn will set the source bitmap of the view to null if the url is empty. If the url isn't empty, it makes a request. This means that one is forced to make a network request even if there isn't a valid network url associated with that particular view, otherwise instead of displaying the default image it displays an empty view.

String url = getURL();    NetworkImageView niv = (NetworkImageView)rootView.findViewById(R.id.niv);    if(url.length() > 0)        niv.setImageUrl(url, imageLoader);    niv.setDefaultImageResId(R.drawable._default);    niv.setErrorImageResId(R.drawable.error);

需要最新版的 volley,旧版的存在bug,不能设置

可用volley jar 下载地址 http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.mcxiaoke.volley%22