php - Passing a get request to remote server in android

I am trying to send a post request to a remote server from an android application. The request should insert values in one of the columns of the database. The PHP code on the server side is like this :

 $servername="sql9.freesqldatabase.com"; 
$username="sql9193859"; 
$password="MUEpGxKWUt"; 
$dbname="sql9193859"; 

$sms_content=$_GET["sms_content"]; 

$conn=new mysqli($servername,$username,$password,$dbname); 

// check connection 

if ($conn->connect_error){
    die("Connection failed: ".$conn->connect_error); 
}
else {

    echo "connected successfully"; 
    $sql="insert into SMS_TABLE(content) values ($sms_content)"; 
    if ($conn->query($sql)===true){
        echo "New record inserted successfully"; 
    }
    else {
        echo "Error:".$sql."
".$conn->error; 
    }
}


?>

The method to send a get request to the remote server is like this :

public void insertSMS() throws IOException {
        viewbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {

                    URL url = new URL("https://smssaver.000webhostapp.com/helloworld/insert_data.php?sms_content=100");
                    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                    urlConnection.disconnect();
                } catch (MalformedURLException e1) {
                    e1.printStackTrace();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        });



    }

When I type the link on the browser, it is working properly. But, it's not working when I call it in Android.