新的File()构造函数可以在Android上返回null吗?

我在Android培训中心网站上看到了这个代码:

boolean hasExternalStoragePrivateFile() { // Get path for the file on external storage. If external // storage is not currently mounted this will fail. File file = new File(getExternalFilesDir(null), "DemoFile.jpg"); if (file != null) { return file.exists(); } return false; } 

这是否意味着在Android new File()可以返回null?

http://developer.android.com/reference/android/content/Context.html#getExternalFilesDir(java.lang.String)

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