blocks|key|432112|text|您可以使用getExternalStorageDirectory()获取外部存储目录。文档很好地解释了它的用法http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%2528%2529|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|432113|对于USB设备，您可能需要查看UsbManager类或更一般的android.hardware.usb+http://developer.android.com/reference/android/hardware/usb/UsbManager.html。|432114|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%2528%2529|1|http://developer.android.com/reference/android/hardware/usb/UsbManager.html^0|5|T|1J|2S|0|0|F|A|V|K|1G|23|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

You can use the <code>getExternalStorageDirectory()</code> to get the external storage directory. The documentation gives a good explanation of its usage <a href="http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%28%29" rel="nofollow">http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%28%29</a>

For USB devices you probably have to look into the <code>UsbManager</code> class or more generally <code>android.hardware.usb</code> <a href="http://developer.android.com/reference/android/hardware/usb/UsbManager.html" rel="nofollow">http://developer.android.com/reference/android/hardware/usb/UsbManager.html</a>

blocks|key|646546|text|Environment.getExternalStorageState()返回内部SD挂载点的路径，如"/mnt/sdcard“|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|646547|不，Environment.getExternalStorageDirectory()指的是设备制造商认为是“外部存储”的任何东西。在某些设备上，这是可移动介质，如SD卡。在某些设备上，这是设备上闪存的一部分。在这里，“外部存储”指的是“安装在主机上时可通过USB大容量存储模式访问的内容”，至少在Android+1.x和2.x上是这样。|646548|但问题是关于外部SD。如何获取"/mnt/sdcard/external_sd“这样的路径(不同设备可能会有所不同)？|646549|Android没有“外部SD”的概念，除了外部存储，如上所述。|646550|如果设备制造商选择使用板载闪存和SD卡，您需要与制造商联系，以确定您是否可以使用SD卡(不保证)以及使用规则，例如使用路径。|646551|试试这个：|646552|Manifest.xml：|646553|<receiver+android:name=".MyReceiver">
++++<intent-filter>
+++++++++<action+android:name="android.intent.action.ums_connected"+/>
+++++</intent-filter>
++</receiver>|code-block|syntax|javascript|646554|我的接收者：|646555|public+class+MyReceiver+extends+BroadcastReceiver{
if+(intent.getAction().equalsIgnoreCase(
++++++++"android.intent.action.UMS_CONNECTED"))+{...}
}|646556|entityMap^0|0|11|0|2|15|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|18|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|19|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1A|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1B|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1C|8|@]|D|@]|E|$]]|$1|R|3|S|5|T|7|1D|8|@]|D|@]|E|$U|V]]|$1|W|3|X|5|6|7|1E|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|T|7|1F|8|@]|D|@]|E|$U|V]]|$1|10|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|11|$]]

<code>Environment.getExternalStorageState()</code> returns path to internal SD mount point like "/mnt/sdcard"

No, <code>Environment.getExternalStorageDirectory()</code> refers to whatever the device manufacturer considered to be "external storage". On some devices, this is removable media, like an SD card. On some devices, this is a portion of on-device flash. Here, "external storage" means "the stuff accessible via USB Mass Storage mode when mounted on a host machine", at least for Android 1.x and 2.x.

But the question is about external SD. How to get a path like "/mnt/sdcard/external_sd" (it may differ from device to device)?

Android has no concept of "external SD", aside from external storage, as described above.

If a device manufacturer has elected to have external storage be on-board flash and also has an SD card, you will need to contact that manufacturer to determine whether or not you can use the SD card (not guaranteed) and what the rules are for using it, such as what path to use for it.

Try this out:

Manifest.xml:

<pre><code>&lt;receiver android:name=".MyReceiver"&gt;
 &lt;intent-filter&gt;
 &lt;action android:name="android.intent.action.ums_connected" /&gt;
 &lt;/intent-filter&gt;
 &lt;/receiver&gt;
</code></pre>

Myreceiver:

<pre><code>public class MyReceiver extends BroadcastReceiver{
if (intent.getAction().equalsIgnoreCase(
 "android.intent.action.UMS_CONNECTED")) {...}
}
</code></pre>

blocks|key|432278|text|要获取所有可用的外部存储文件夹(包括SD卡)，您可以使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|432279|File[]+externalStorageFiles=ContextCompat.getExternalFilesDirs(this,null);|code-block|syntax|javascript|432280|要转到每个外部存储的“根”(即实际的挂载文件夹路径)，您可以使用我创建的这个函数：|432281|++/**+Given+any+file/folder+inside+an+sd+card,+this+will+return+the+path+of+the+sd+card+*/
++private+static+String+getRootOfInnerSdCardFolder(File+file)
++++{
++++if(file==null)
++++++return+null;
++++final+long+totalSpace=file.getTotalSpace();
++++while(true)
++++++{
++++++final+File+parentFile=file.getParentFile();
++++++if(parentFile==null%7C%7CparentFile.getTotalSpace()!=totalSpace)
++++++++return+file.getAbsolutePath();
++++++file=parentFile;
++++++}
++++}|432282|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To get all available external storage folders (including SD cards), you can use this :

<pre><code>File[] externalStorageFiles=ContextCompat.getExternalFilesDirs(this,null);
</code></pre>

To go to the "root" of each external storage (the one that is the real mounting folder path), you can use this function I've made:

<pre><code> /** Given any file/folder inside an sd card, this will return the path of the sd card */
 private static String getRootOfInnerSdCardFolder(File file)
 {
 if(file==null)
 return null;
 final long totalSpace=file.getTotalSpace();
 while(true)
 {
 final File parentFile=file.getParentFile();
 if(parentFile==null||parentFile.getTotalSpace()!=totalSpace)
 return file.getAbsolutePath();
 file=parentFile;
 }
 }
</code></pre>

blocks|key|432324|text|我现在这个话题已经过时了，但这可能会有所帮助。你应该使用这个方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|432325|System.getenv()；|432326|请参阅项目Environment3以访问连接到您的设备的所有存储。|432327|https://github.com/omidfaraji/Environment3|offset|length|432328|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|16|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@$H|U|I|V|1|W]]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|G]]]]

I now this topic is old but this may help. you should use thi method.

System.getenv();

see project Environment3 to access all storage that are connected to your device.

<a href="https://github.com/omidfaraji/Environment3" rel="nofollow">https://github.com/omidfaraji/Environment3</a>

blocks|key|646696|text|另一种选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|646697|首先获取所有外部文件目录|646698|File[]+externalStorageFiles=ContextCompat.getExternalFilesDirs(this,null);|code-block|syntax|javascript|646699|然后为每个文件夹调用此函数|646700|private+static+String+getRootOfExternalStorage(File+file)
{
++++if+(file+==+null)
++++++++return+null;
++++String+path+=+file.getAbsolutePath();
++++return+path.replaceAll("/Android/data/"+%2B+getPackageName()+%2B+"/files",+"");
}|646701|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Another alternative.

First get all external files dirs 

<pre><code>File[] externalStorageFiles=ContextCompat.getExternalFilesDirs(this,null);
</code></pre>

Then call this function for each of the folders 

<pre><code>private static String getRootOfExternalStorage(File file)
{
 if (file == null)
 return null;
 String path = file.getAbsolutePath();
 return path.replaceAll("/Android/data/" + getPackageName() + "/files", "");
}
</code></pre>

Here we are developing android app for android TV box. How can I get the list of mounted external storage like <code>USB stick, SDCARD and SATA HDD.</code>

How can I get the list of mounted external storage of android device

Android

在这里，我们正在为android电视盒开发android应用程序。如何获取已挂载的外部存储(如USB stick, SDCARD and SATA HDD. )的列表

问如何获取android设备挂载的外存列表
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