Android Volley retrieve data from MySQL database by id

I’m build a simple Android application using Volley. i try of select specific date by ID, to it show in a textview or edittext, Unfortunately, it doesn’t do anything… It even doesn’t show any error or toast message. Do you know how to fix it?

PHP Script

<?php 
    //Creating a connection
if ( $_SERVER[ "REQUEST_METHOD" ] == "POST" ) {
    require 'conn.php';
    myapp();
}

    function myapp() {
    global $connect;

        $id = $_GET["id"]; 
        $query = "Select movie_name from movies_table WHERE id = '$id'";
        $result = mysqli_query($connect ,$query);

        $number_of_rows = mysqli_num_rows($result);

$temp_array = array();

if($number_of_rows >0){
while ($row = mysqli_fetch_assoc($result)){
$temp_array[] = $row;
}
}

    header('Content-Type:Application/json');

    echo json_encode(array("saagTracker"=> $temp_array));

    //mysqli_free_result($result);

    mysqli_close($connect);

    }

 ?>

the specific ID return this data in postman

{"saagTracker":[{"movie_name":"Avatar 2"}]}

And this is my code of StringRequest:

public class MainActivity extends Activity {

    TextView titulo;
    EditText titulo2;
    RequestQueue requestQueue;
    String test = "1";
    String showURL = "http://localhost/app/test/show.php?id=" + test;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        titulo = findViewById(R.id.textViewtitulo);
        titulo2 = findViewById(R.id.editTexttit);

        requestQueue = Volley.newRequestQueue(getApplicationContext());

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST,
                showURL, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {

                    JSONArray saagTracker = response.getJSONArray("saagTracker");
                    for (int i = 0; i < saagTracker.length(); i++) {
                        JSONObject object = saagTracker.getJSONObject(i);

                        String titulox = object.getString("movie_name");
                        titulo2.setText(titulox);
                    }


                } catch (JSONException e){
                    e.printStackTrace();
                }
                //JSONArray array = new JSONArray(response.body().string());

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
            }
        });
        requestQueue.add(jsonObjectRequest);

    }
}

and for last this is my build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.elgeos.school.carga"
        minSdkVersion 23
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:26.1.0'
    compile 'com.mcxiaoke.volley:library:1.0.19'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
}

this is image app test
enter image description here