众所周知,Android设备具有将手机变成访问点/热点的功能。
在程序上,是否可以获取连接到手机Wifi访问点的设备数量?
/**
* Try to extract a hardware MAC address from a given IP address using the
* ARP cache (/proc/net/arp).<br>
* <br>
* We assume that the file has this structure:<br>
* <br>
* 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 && 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;
}
或者如果您在代码上遇到问题,请尝试以下代码:
public ArrayList<InetAddress> getConnectedDevices(String YourPhoneIPAddress) {
ArrayList<InetAddress> ret = new ArrayList<InetAddress>();
LoopCurrentIP = 0;
String IPAddress = "";
String[] myIPArray = YourPhoneIPAddress.split("\\.");
InetAddress currentPingAddr;
for (int i = 0; i <= 255; i++) {
try {
// build the next IP address
currentPingAddr = InetAddress.getByName(myIPArray[0] + "." +
myIPArray[1] + "." +
myIPArray[2] + "." +
Integer.toString(LoopCurrentIP));
ad = currentPingAddr.toString(); /////////////////
Log.d("MyApp",ad); //////////////
// 50ms Timeout for the "ping"
if (currentPingAddr.isReachable(50)) {
ret.add(currentPingAddr);
ad = currentPingAddr.toString(); /////////////////
Log.d("MyApp",ad); //////////////
}
} catch (UnknownHostException ex) {
} catch (IOException ex) {
}
LoopCurrentIP++;
}
return ret;
}