您可以使用：

   WebView webView = // ...

   webView.loadUrl("file:///myPath/myFile.html");

在一个Android应用程序，文件可以从3种类型的存储单元，读：

In an Android application, files can be read from 3 types of locations:

• 内部存储：每个应用程序都有自己的，文件名是相对于这个位置。 URL的形式文件：///myFolder/myFile.html

• Internal storage: Each app has its own, file names are relative to this location. URL takes form file:///myFolder/myFile.html

外部存储：需要许可，不得始终可用。获取根文件夹通过调用Environment.getExternalStorageDirectory(). 字符串URL =：那么，用构造URL的file：///+ Environment.getExternalStorageDirectory（）的toString（）+文件分割符+MyFolder中/ myFile.html

External storage: Needs permission and may not always be available. Get the root folder by calling Environment.getExternalStorageDirectory(). So, construct the URL using: String url = "file:///" + Environment.getExternalStorageDirectory().toString() + File.separator + "myFolder/myFile.html"

资产：存储在APK。只读访问。 URL的形式文件：///android_asset/myFolder/myFile.html （另见的加载一个Android资源到的WebView ）

Assets: Stored in the apk. Read-only access. URL takes form file:///android_asset/myFolder/myFile.html (See also Loading an Android resource into a webview)