封装网络状态工具类，判断有无网络

public class NetWorkUtil {
    //判断是不是wifi
    public static boolean isNetWork(Context context){
        //获取网络管理
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //获取网络信息
        NetworkInfo info = connectivityManager.getActiveNetworkInfo();
        if(info != null && info.getType() == ConnectivityManager.TYPE_WIFI){
            return true;
        }
        return false;
    }
}