XAMARIN Android獲取WIFIMAC地址的方法
1. 常用方法，呼叫Android的API：WifiManager
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
return info.getMacAddress();
此方法需要保證WIFI在本次開機以來曾經是開啟過的，否則會返回null。所以需要後臺嘗試先開啟WIFI再獲取。
示例程式碼：
//嘗試開啟wifi
private static boolean tryOpenMAC(WifiManager manager)
{
boolean softOpenWifi = false;
int state = manager.getWifiState();
if (state != WifiManager.WIFI_STATE_ENABLED && state != WifiManager.WIFI_STATE_ENABLING)
{
manager.setWifiEnabled(true);
softOpenWifi = true;
}
return softOpenWifi;
}
//嘗試關閉MAC
private static void tryCloseMAC(WifiManager manager)
{
manager.setWifiEnabled(false);
}
//嘗試獲取MAC地址
private static String tryGetMAC(WifiManager manager)
{
WifiInfo wifiInfo = manager.getConnectionInfo();
if (wifiInfo == null || StringUtil.isNull(wifiInfo.getMacAddress()))
{
return null;
}
String mac = wifiInfo.getMacAddress().replaceAll(":", "").trim().toUpperCase();
mac = formatIdentify(mac);
return mac;
}
//嘗試讀取MAC地址
private static String getMacFromDevice(int internal)
{
String mac=null;
WifiManager wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
mac = tryGetMAC(wifiManager);
if(!StringUtil.isNull(mac))
{
return mac;
}
//獲取失敗，嘗試開啟wifi獲取
boolean isOkWifi = tryOpenMAC(wifiManager);
for(int index=0;index<internal;index++)
{
//如果第一次沒有成功，第二次做100毫秒的延遲。
if(index!=0)
{
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
mac = tryGetMAC(wifiManager);
if(!StringUtil.isNull(mac))
{
break;
}
}
//嘗試關閉wifi
if(isOkWifi)
{
tryCloseMAC(wifiManager);
}
return mac;
}
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2. 查詢檔案路徑 /sys/class/net/wlan0/address
adb shell cat /sys/class/net/wlan0/address
98:6c:f5:10:96:c4
但是如果WIFI在本次開機期間從來沒有開啟過，返回的MAC地址是不同的（非實際的），如下：
cat /sys/class/net/wlan0/address
00:90:4c:11:22:33
示例程式碼：
String getMac() {
String macSerial = null;
String str = "";
try {
Process pp = Runtime.getRuntime().exec("cat /sys/class/net/wlan0/address");
InputStreamReader ir = new InputStreamReader(pp.getInputStream());
LineNumberReader input = new LineNumberReader(ir);
for (; null != str;) {
str = input.readLine();
if (str != null) {
macSerial = str.trim();
break;
}
}
} catch (IOException e) {
e.printStackTrace();
}
return macSerial;
}
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3. 查詢記錄了MAC地址的檔案“/proc/net/arp”，但是從測試結果看，返回的資料並不是想要的Wifi Mac地址：
比如，手機實際的WIFI Mac地址是98:6c:f5:10:96:c4，但使用adb shell cat proc/net/arp返回的是：
cat proc/net/arp
IP address HW type Flags HW address Mask Device
192.168.0.3 0x1 0x2 00:23:89:b9:1a:fd * wlan0
192.168.0.1 0x1 0x2 08:00:27:7c:65:5a * wlan0