connecting to localhost in android using okhttpclient in post method and json

Question

I have an android login page which will connect localhost url, pass json object and accept a json object from server and toast it. But now I have only done receiving part on url request. I came to know that we have to use IP instead of localhost in android from stackoverflow itself. But I didn't get any reply from the server. It is showing blank. But if I use external url I get it correctly. I have commented that url just above it. And if I decode json and echo it in the browser it works fine. But I am not getting it in my app.

This is my Android Code:

public class FeedTask extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {
        try {

            OkHttpClient client = new OkHttpClient();

            RequestBody postData = new FormBody.Builder()
                    .add("type","json")
                    .build();

            Request request = new Request.Builder()
                    //.url("http://codemobiles.com/adhoc/feed/youtube_feed.php")
                    .url("http://192.168.1.100/patronheedV1.1.1/App/Request/abc")
                    .post(postData)
                    .build();

            Response response = client.newCall(request).execute();
            String result = response.body().string();
            return  result;
        } catch (Exception e) {
            return null;
        }
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
    }

}

And this is my PHP code:

<?php
class App {

    public function Request() {
        if ( isset($_POST) ){
            $obj = (object) ['aString' => 'Working'];
            return json_encode($obj);
        } else {
            $obj = (object) ['aString' => 'Notworking'];
            return json_encode($obj);
        }
    }

    public function fetchRequest() {
        if ( isset($_POST['Request']) && isset($_POST['Token']) ){
            $user = $_POST['User'];
            return $user;
        } else {
            return NULL;
        }
    }

}