检查SD卡为present，布尔值始终为true

问题描述：

在我的闪屏，我要检查，如果手机有一个SD卡。布尔语句是下面：

In my splash screen, I want to check if the phone has a SDCard. The Boolean statement is beneath:

    Boolean isSDPresent = android.os.Environment.getExternalStorageState()
            .equals(android.os.Environment.MEDIA_MOUNTED );

所以，如果我在我的手机上的插槽SD卡，这个布尔将返回true，到目前为止，一切顺利。当我去了卸载SD卡，从设置菜单，并删除SD卡，然后杀死的应用程序，然后重新启动它，布尔也将是如此。

So, if I have the SDCard in the slot on my phone, this boolean will return true, so far so good. When I go to the "Unmount SDCard" from the settings menu, and removes the SDCard, then kill the app and launching it again, the boolean will also be true..

如果我启动天文文件管理器卸载和删除的SD卡后，我仍然可以访问到/ mnt / SD卡路径，为什么？

And if I launches the Astro File Manager after unmounting and removing the sdcard, I can still access the /mnt/sdcard path, why?

我如何管理做到这一点？

How can I manage to accomplish this?

在此先感谢！

修改

测试与下面的code：

Testing with the following code:

File path = Environment.getExternalStorageDirectory(); 
String pathS = path.getPath();

在SD卡在插槽中，路径包含 MNT / SD卡，但是当我删除SD卡在路径还是到/ mnt / SD卡 ...

When the SDCard is in the slot, the pathS contains mnt/sdcard, but when I removes the SDCard the pathS is still /mnt/sdcard ...

答

我发现手机，如三星银河手机，有到/ mnt / SD卡点到内存，而不是外部的SD卡作为预期。

I've found that phones, like the Galaxy phones from Samsung, have /mnt/sdcard point to internal memory and not the external SD card as expected.

您可以知道，如果路径由Environment.getExternalStorageDirectory()实际上就是外置SD卡调用Environment.isExternalStorageRemovable()

You can know if the path returned by Environment.getExternalStorageDirectory() is actually the external SD card with a call to Environment.isExternalStorageRemovable()

只是想从文档的getExternalStorageDirectory（）这个重要的注意事项补充：

Just wanted to add from the docs for getExternalStorageDirectory() this important note:

请注意：千万不要被这个词迷惑外部在这里。此目录可以更好地被认为是媒体/共享存储。它是一个文件系统，可以容纳比较大量的数据和被跨越共享所有的应用程序（不强制许可）。传统上，这是 SD卡，但它也可以被实现为内置存储在一个装置，其从被保护的内部存储不同，并且可以是作为安装在计算机上的文件系统。

Note: don't be confused by the word "external" here. This directory can better be thought as media/shared storage. It is a filesystem that can hold a relatively large amount of data and that is shared across all applications (does not enforce permissions). Traditionally this is an SD card, but it may also be implemented as built-in storage in a device that is distinct from the protected internal storage and can be mounted as a filesystem on a computer.

检查SD卡为present，布尔值始终为true

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