Encountering android.os.NetworkOnMainThreadException while fetching data from a PHP script using Okhttp

Question

I am making an android app.To fetch data from the app server running on my localhost using phpmyadmin, i am using below described php script:

<?php
$host = "localhost";
$db_user = "root" ;
$db_password = "" ;
$db_name = "FCM";

if(isset($_POST["Token"])){
  $con = mysqli_connect($host,$db_user,$db_password,$db_name);

  $sql = "select * from User";

  $res = mysqli_query($con,$sql);

  $result = array();

  while($row = mysqli_fetch_array($res)){
      array_push($result,
          array('UserName'=>$row[0], 'EmailID'=>$row[1], 'UID'=>$row[2]
      ));
  }

  echo json_encode(array("users"=>$result));

  mysqli_close($con);
 }
 ?>

And in my java class, in order to gather the response, I am using Okhttp and below described code:

public void getDataOKHTTP() {
    OkHttpClient client = new OkHttpClient();
    RequestBody body = new FormBody.Builder().add("Token","").build();
    Request request = new Request.Builder().url("http://.........../fcm/test.php").post(body).build();
    System.out.println("@ register a new token ");
    try {
        Response response= client.newCall(request).execute();
        //response.header("Content-Type: application/json");
        myJSON = response.body().string();
    }catch (IOException e){
        e.printStackTrace();
    }
}

But when i run my app, i get,

com.example.apple.fetchdata, PID: 6092 android.os.NetworkOnMainThreadException.

I would be highly obliged if you could help me learn and resolve this problem.

thank you :)

Possible duplicate of [NetworkOnMainThread](http://stackoverflow.com/questions/9745859/networkonmainthread) — Nikhil, Sep 21 '16 at 06:15
Long running task should be on background thread so that UI does not block and app remain responsive. — Suhail Mehta, Sep 21 '16 at 06:16
Possible duplicate of [How to fix android.os.NetworkOnMainThreadException?](http://stackoverflow.com/questions/6343166/how-to-fix-android-os-networkonmainthreadexception) — Sanoop Surendran, Sep 21 '16 at 06:20
you need to use AsyncTask for that and call getDataOKHTTP() in doInBackground() method — Arpit Patel, Sep 21 '16 at 06:25
Use [Asynchronous Get](https://github.com/square/okhttp/wiki/Recipes#asynchronous-get) in OkHttp. — K Neeraj Lal, Sep 21 '16 at 06:26

score 1 · Accepted Answer · answered Sep 21 '16 at 06:23

1

All network operations has to be done on background thread, you're doing it on a main thread

answered Sep 21 '16 at 06:23

Alex Shutov

3,217
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score 0 · Answer 2 · answered Jul 27 '17 at 11:51

I know it's a late answer for this question. as Th3Dark0 said , All the networking calls must be done on background thread, you should use enque method rather then execute while making a call in OKHttp. You can have a look at here if are you still interested : Networking with OkHttp

Encountering android.os.NetworkOnMainThreadException while fetching data from a PHP script using Okhttp

2 Answers2