检查wifi是否开启

public static boolean checkWifi(Activity activitiy) {
WifiManager mWifiManager = (WifiManager) activitiy
.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = mWifiManager.getConnectionInfo();
int ipAddress = wifiInfo == null ? 0 : wifiInfo.getIpAddress();
if (mWifiManager.isWifiEnabled() && ipAddress != 0) {
// LogUtil.i("====================", "WIFI is on");
return true;
} else {
// LogUtil.i("====================", "**** WIFI is off");
return false;
}
}