Kotlin 取 MAC 地址

 package com.example.ybs.myapplication

 import android.annotation.SuppressLint
 import android.net.wifi.WifiManager
 import android.support.v7.app.AppCompatActivity
 import android.os.Bundle
 import kotlinx.android.synthetic.main.activity_main.*
 import java.net.NetworkInterface

 class MainActivity : AppCompatActivity() {

     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main);

         var mac = getLocalMacAddress();
         txtInfo.text = mac;
     }

     @SuppressLint("WifiManagerLeak")
     fun getLocalMacAddress():String{
          var Context = this.applicationContext;
         var wifi= getSystemService(WIFI_SERVICE) as WifiManager;
         var info=wifi.connectionInfo;
         return info.macAddress;
     }

 }

需要权限

    <permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <permission android:name="android.permission.CHANGE_WIFI_STATE" />