public class NetWorkUtil {
    //判斷是不是wifi
    public static boolean isNetWork(Context context){
        //獲取網路管理
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //獲取網路資訊
        NetworkInfo info = connectivityManager.getActiveNetworkInfo();
        if(info != null && info.getType() == ConnectivityManager.TYPE_WIFI){
            return true;
        }
        return false;
    }
}