blocks|key|4515359|text|您假设getBSSID()将为两个不同的频段返回两个不同的地址，这一假设是正确的，因为它们实际上是两个不同的接入点，一个2.4+GHz和一个5+GHz，只是简单地封装在同一个包中。我编写了一个快速应用程序，它可以获取并显示使用WifiInfo类可以获得的所有可用字段。当我连接到接入点的2.4+GHz频段时，详细信息如下：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4515360|​|4515361|📷|atomic|4515362|4515363|请注意，您可以告诉您已连接到2.4+GHz频段(“频率:+2452")。对5+GHz频段重复此过程将显示以下内容：|4515364|4515365|4515366|4515367|如您所见，两个不同频段的MAC地址仅相差一个数字；我不知道是否所有路由器都是如此。如果确实如此，那么您可以通过分析MAC地址(BSSID)和频率的组合来最终确定您连接的接入点。|4515368|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/420c9ea02b9363855069424f547db86b.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/c9504bc89baab2fdc206087364dc0fd6.png^0|3|A|35|8|0|0|0|1|0|0|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|18|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|K|3|G|5|6|7|1D|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1E|8|@]|D|@]|E|$]]|$1|N|3|G|5|6|7|1F|8|@]|D|@]|E|$]]|$1|O|3|I|5|J|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|P|3|G|5|6|7|1K|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1L|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]|11|$5|V|W|X|E|$Y|12|10|-4]]]]

You are correct in assuming that <code>getBSSID()</code> will return two different addresses for the two different bands, as they are essentially two different access points, one 2.4GHz and one 5 GHz, simply wrapped up in the same package. I wrote a quick app that gets and displays all of the available fields that may be obtained using the <code>WifiInfo</code> class. When I connected to the 2.4 GHz band of my access point the details were as follows:
<img src="https://i.stack.imgur.com/NV39b.png" alt="enter image description here" />
Note that you can tell you are connected to the 2.4 GHz band (&quot;Frequency: 2452&quot;). Repeating the process with the 5 GHz band shows the following:
<img src="https://i.stack.imgur.com/EigBR.png" alt="enter image description here" />
As you can see, the MAC addresses for the two different bands differ by only one number; I do not know if this is the case for all routers. If this is indeed the case, then you can conclusively determine which access point you are connected to by analyzing a combination of the MAC address (BSSID) and the frequency.

blocks|key|4515396|text|只需使用AP的MAC地址。(MAC地址是唯一的)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4515397|下面是如何实现的：Can+I+find+the+MAC+address+of+my+Access+point+in+Android?|offset|length|4515398|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6063889/can-i-find-the-mac-address-of-my-access-point-in-android^0|0|9|1L|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Just use MAC address of the AP. (MAC Address is unique)

Here is how:
<a href="https://stackoverflow.com/questions/6063889/can-i-find-the-mac-address-of-my-access-point-in-android">Can I find the MAC address of my Access point in Android?</a>

blocks|key|4515422|text|对于唯一标识符，可以使用BSSI%2BFrequency|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4515423|示例：-AA:AA%2B2432和AA:AA%2B5230在双频段情况下是唯一的|4515424|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

For unique identifier, you can use
BSSI+Frequency

Example:-
AA:AA:AA:AA:AA:AA+2432 and AA:AA:AA:AA:AA:AA+5230 are unique in dual band case

blocks|key|4515448|text|您可以找到路由器的Mac地址，并将其用作唯一标识它的基础。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4515449|您可以通过检查您的Android设备ARP表并比较您连接的路由器IP来完成此操作。示例如下所示：|4515450|http://www.flattermann.net/2011/02/android-howto-find-the-hardware-mac-address-of-a-remote-host/|offset|length|4515451|提取相关代码：|4515452|/**
+*+Try+to+extract+a+hardware+MAC+address+from+a+given+IP+address+using+the
+*+ARP+cache+(/proc/net/arp). 
+*+ 
+*+We+assume+that+the+file+has+this+structure: 
+*+ 
+*+IP+address+++++++HW+type+++++Flags+++++++HW+address++++++++++++Mask+++++Device
+*+192.168.18.11++++0x1+++++++++0x2+++++++++00:04:20:06:55:1a+++++*++++++++eth0
+*+192.168.18.36++++0x1+++++++++0x2+++++++++00:22:43:ab:2a:5b+++++*++++++++eth0
+*
+*+@param+ip
+*+@return+the+MAC+from+the+ARP+cache
+*/
public+static+String+getMacFromArpCache(String+ip)+{
++++if+(ip+==+null)
++++++++return+null;
++++BufferedReader+br+=+null;
++++try+{
++++++++br+=+new+BufferedReader(new+FileReader("/proc/net/arp"));
++++++++String+line;
++++++++while+((line+=+br.readLine())+!=+null)+{
++++++++++++String[]+splitted+=+line.split("+%2B");
++++++++++++if+(splitted+!=+null+&&+splitted.length+>=+4+&&+ip.equals(splitted[0]))+{
++++++++++++++++//+Basic+sanity+check
++++++++++++++++String+mac+=+splitted[3];
++++++++++++++++if+(mac.matches("..:..:..:..:..:.."))+{
++++++++++++++++++++return+mac;
++++++++++++++++}+else+{
++++++++++++++++++++return+null;
++++++++++++++++}
++++++++++++}
++++++++}
++++}+catch+(Exception+e)+{
++++++++e.printStackTrace();
++++}+finally+{
++++++++try+{
++++++++++++br.close();
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}
++++return+null;
}|code-block|syntax|javascript|4515453|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|2O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|12|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|E]]]]

You can find the Mac address of your router and use that as your basis for uniquely identifying it.

You can do so by checking your Android devices ARP table and compare the router IP that you are connected to. An example can be shown here:

<a href="http://www.flattermann.net/2011/02/android-howto-find-the-hardware-mac-address-of-a-remote-host/" rel="nofollow">http://www.flattermann.net/2011/02/android-howto-find-the-hardware-mac-address-of-a-remote-host/</a>

Relevant code extracted:

<pre><code>/**
 * Try to extract a hardware MAC address from a given IP address using the
 * ARP cache (/proc/net/arp).&lt;br&gt;
 * &lt;br&gt;
 * We assume that the file has this structure:&lt;br&gt;
 * &lt;br&gt;
 * IP address HW type Flags HW address Mask Device
 * 192.168.18.11 0x1 0x2 00:04:20:06:55:1a * eth0
 * 192.168.18.36 0x1 0x2 00:22:43:ab:2a:5b * eth0
 *
 * @param ip
 * @return the MAC from the ARP cache
 */
public static String getMacFromArpCache(String ip) {
 if (ip == null)
 return null;
 BufferedReader br = null;
 try {
 br = new BufferedReader(new FileReader("/proc/net/arp"));
 String line;
 while ((line = br.readLine()) != null) {
 String[] splitted = line.split(" +");
 if (splitted != null &amp;&amp; splitted.length &gt;= 4 &amp;&amp; ip.equals(splitted[0])) {
 // Basic sanity check
 String mac = splitted[3];
 if (mac.matches("..:..:..:..:..:..")) {
 return mac;
 } else {
 return null;
 }
 }
 }
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 try {
 br.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 return null;
}
</code></pre>

Is there any way I can get any unique identifier for a particular wifi router?

I'm trying to write an Android app that needs to know which router it is connected to. I know that android provides a way to get the BSSID of the currently connected network, but to my surprise, this is not unique. 
I found out that on dual band routers, two different devices could be getting two different BSSID, even if they are on the same SSID. 
Is there any other parameter I can fetch that can uniquely identify the wifi I am connected to? I would love to try some third party library, if that would allow me, since I am quite certain Android does not come packaged with a better method than giving me the BSSID. 

Edit: I'm trying to find out who all have set their home wifi (via the app) as the same Wi-Fi as me. Each user sets their 'home Wi-Fi' which gets saved on the server ( the mac address is what I'm saving). Then each user can query who all are on their Wi-Fi, and if they are currently connected on that Wi-Fi or not. The query of 'who is on my wifi' is done by searching for the same MAC address as the one I'm connected to. This fails if my home has a dual band, since they could be connected to the second frequency (and thus second MAC).

Fetch unique identifier for a WiFi router

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有没有办法为特定的wifi路由器获取任何唯一的标识符？我正在尝试写一个Android应用程序，它需要知道它连接到哪个路由器。我知道android提供了一种方法来获取当前连接的网络的BSSID，但令我惊讶的是，这并不是唯一的。我发现在双频路由器上，两个不同的设备可能会获得两个不同的BSSID，即使它们位于相同的SSID上...

问获取WiFi路由器的唯一标识符
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