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OBTENER IMEI DE UN DISPOSITIVO ANDROID

final TelephonyManager mngr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String imei = mngr.getDeviceId() != null ? mngr.getDeviceId() : "000000000000000";

OBTENER MAC ADDRESS DE UN DISPOSITIVO ANDROID

WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo wInfo = wifiManager.getConnectionInfo();
String macAddress = wInfo.getMacAddress() != null ? wInfo.getMacAddress().toUpperCase() : "";

OBTENER ID DEL DISPOSITIVO ANDROID

final TelephonyManager mngr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
imei = Secure.getString(getContentResolver(), Secure.ANDROID_ID);