获取android手机mac地址

android系统6.0之后，对mac地址的获取添加了权限，按照普通的方法获取如下：

WifiManager  wifiMan = (WifiManager)context.getSystemService(Context.WIFI_SERVICE) ;
WifiInfo wifiInf = wifiMan.getConnectionInfo();
return wifiInf.getMacAddress();

但是这种情况，获取到的mac地址都是：02:00:00:00:00:00，看来就需要另一种方法来获取mac地址：

private static final String marshmallowMacAddress = "02:00:00:00:00:00";
private static final String fileAddressMac = "/sys/class/net/wlan0/address";

public static String getAdresseMAC(Context context) {
WifiManager wifiMan = (WifiManager)context.getSystemService(Context.WIFI_SERVICE) ;
WifiInfo wifiInf = wifiMan.getConnectionInfo();

if(wifiInf !=null && marshmallowMacAddress.equals(wifiInf.getMacAddress())){
String result = null;
try {
result= getAdressMacByInterface();
if (result != null){
return result;
} else {
result = getAddressMacByFile(wifiMan);
return result;
}
} catch (IOException e) {
Log.e("MobileAccess", "Erreur lecture propriete Adresse MAC");
} catch (Exception e) {
Log.e("MobileAcces", "Erreur lecture propriete Adresse MAC ");
}
} else{
if (wifiInf != null && wifiInf.getMacAddress() != null) {
return wifiInf.getMacAddress();
} else {
return "";
}
}
return marshmallowMacAddress;
}

接下来，来分析一下其中两个重要的方法

1.getAdressMacByInterface()

private static String getAdressMacByInterface(){
try {
List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface nif : all) {
if (nif.getName().equalsIgnoreCase("wlan0")) {
byte[] macBytes = nif.getHardwareAddress();
if (macBytes == null) {
return "";
}

StringBuilder res1 = new StringBuilder();
for (byte b : macBytes) {
res1.append(String.format("%02X:",b));
}

if (res1.length() > 0) {
res1.deleteCharAt(res1.length() - 1);
}
return res1.toString();
}
}

} catch (Exception e) {
Log.e("MobileAcces", "Erreur lecture propriete Adresse MAC ");
}
return null;
}

2.getAddressMacByFile(wifiMan)

private static String getAddressMacByFile(WifiManager wifiMan) throws Exception {
String ret;
int wifiState = wifiMan.getWifiState();

wifiMan.setWifiEnabled(true);
File fl = new File(fileAddressMac);
FileInputStream fin = new FileInputStream(fl);
ret = crunchifyGetStringFromStream(fin);
fin.close();

boolean enabled = WifiManager.WIFI_STATE_ENABLED == wifiState;
wifiMan.setWifiEnabled(enabled);
return ret;
}

private static String crunchifyGetStringFromStream(InputStream crunchifyStream) throws IOException {
if (crunchifyStream != null) {
Writer crunchifyWriter = new StringWriter();

char[] crunchifyBuffer = new char[2048];
try {
Reader crunchifyReader = new BufferedReader(new InputStreamReader(crunchifyStream, "UTF-8"));
int counter;
while ((counter = crunchifyReader.read(crunchifyBuffer)) != -1) {
crunchifyWriter.write(crunchifyBuffer, 0, counter);
}
} finally {
crunchifyStream.close();
}
return crunchifyWriter.toString();
} else {
return "No Contents";
}
}