1、需要申请的权限

android.permission.ACCESS_WIFI_STATE 
android.permission.CHANGE_WIFI_STATE 
android.permission.WAKE_LOCK 

 2、获取WifiManager 

wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE); 

 3、开启、关闭wifi 

if (wifiManager.isWifiEnabled()) { wifiManager.setWifiEnabled(false); } else { wifiManager.setWifiEnabled(true); }