应用的私人文件 [英] Private file for an app

问题描述

我想创建一个文件，其中存储了一些只能由我的应用访问的数据。外部用户不应访问该文件或对其进行任何更改。我将在文件中存储一个密钥

I would like to create a file which stores some data that can be accessed only by my app.Outside users should not be able to access this file or make any changes to it.I will store a key in the file which maybe accessed by the app whenever needed.

推荐答案

要创建应用程序私有文件（其他应用程序无法读取），则应使用 Context.openFileOutput（）带有标志 MODE_PRIVATE 。

To create an application private file (that is not readable by other applications) you should use Context.openFileOutput() with a flag MODE_PRIVATE.

如果您担心，可以将返回的InputStream包装在 CiperOutputStream 并对内容进行加密。

If you are concerned you could wrap the returned InputStream in CiperOutputStream and encrypt the contents.

如果您以标准加密格式（X.5 09或PKCS＃12），则可以使用新引入的 KeyChain API ICS。

If you are storing keys in a standard crypto format (X.509 or PKCS#12) you could use the new KeyChain API introduced in ICS.

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