Android上的dataDir和deviceProtectedDataDir有什么区别

Question

我试图理解从以下位置获得的某些信息的概念：

ApplicationInfo appinfo = context.getPackageManager().getApplicationInfo(context.getApplicationContext().getPackageName(), 0);

根据文档

/**
     * Full path to the default directory assigned to the package for its
     * persistent data.
     */
    public String dataDir;


/**
 * Full path to the device-protected directory assigned to the package for
 * its persistent data.
 *
 * @see Context#createDeviceProtectedStorageContext()
 */
public String deviceProtectedDataDir;

有时值等于有时不等于...我想了解其背后的真正含义

据我所知，永久数据的默认目录始终受到保护（不受其他应用程序保护）