java - 列出来自 Android App 的包中的文件返回 null

Question

我开发了一个 Android 应用程序，在主要 Activity 中，我想使用以下代码行列出特定包中的所有文件:

String[] files = new File("src/com/android/app/").list();

它返回空值!？有什么不对 ？谢谢。

Answer 1

来自Javadocs对于 File 类:

User interfaces and operating systems use system-dependent pathname strings to name files and directories. This class presents an abstract, system-independent view of hierarchical pathnames. An abstract pathname has two components:

An optional system-dependent prefix string, such as a disk-drive specifier, "/" for the UNIX root directory, or "\\\\" for a Microsoft Windows UNC pathname, and
A sequence of zero or more string names.

看来您缺少前缀字符串。换句话说，路径名不是相对的，而是绝对的。