文件：/// 是一个URI（统一资源标识符），简单地从标准的URI区分我们都知道的非常清楚 - 的http：//

file:/// is a URI (Uniform Resource Identifier) that simply distinguishes from the standard URI that we all know of too well - http://.

它确实意味着一个绝对路径指向在任何环境下的根目录，但在Android的背景下，这是一个约定，告诉了Android运行时间说的在这里，目录 WWW 有一个名为 index.html的位于资产文件夹中根项目的。

It does imply an absolute path name pointing to the root directory in any environment, but in the context of Android, it's a convention to tell the Android run-time to say "Here, the directory www has a file called index.html located in the assets folder in the root of the project".

这就是资产是如何在运行时加载，例如的WebView 插件会确切地知道在哪里指定加载嵌入的资源文件中的文件：/// URI

That is how assets are loaded at runtime, for example, a WebView widget would know exactly where to load the embedded resource file by specifying the file:/// URI.

考虑code例如：

WebView webViewer = (WebView) findViewById(R.id.webViewer);
webView.loadUrl("file:///android_asset/www/index.html");

一个很容易犯的错误这里是这样，有些人会就推断为文件：/// android_assets ，注意资产的URI复数，不知道为什么嵌入的资源不工作！

A very easy mistake to make here is this, some would infer it to as file:///android_assets, notice the plural of assets in the URI and wonder why the embedded resource is not working!