Same responses are received for every request sent from button

Question

The following code is used in the MainActivity:

StringBuilder stringBuilder = new StringBuilder();
Cache cache;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    buttonDiscard = findViewById(R.id.buttonDiscard);

    RequestQueue requestQueue;
    cache = new DiskBasedCache(getCacheDir(), 1024 * 1024); // 1MB cap
    Network network = new BasicNetwork(new HurlStack());
    requestQueue = new RequestQueue(cache, network);
    requestQueue.start();
    String url ="https://www.themealdb.com/api/json/v1/1/random.php";
    StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            stringBuilder::append,
            error -> System.out.println("Error occurred"));
    requestQueue.add(stringRequest);
}
public void handleDiscardClick(View view){
    System.out.println(stringBuilder);
}

The issue I am facing is that I am receiving same string response for every click on the button from the url which gives random meal in json format. The only way I can get different string is with every restart of the android app which is definitely not good at all. I tried moving the networking code inside the button function still I am receiving same response. I will highly appreciate if anyone can tell me how to get different response for every click on the button. (Sorry, I am new to android networking)

Answer 1

I ended up modifying the whole code. I wrote the following code in another class and it worked well:

public class NetworkController {
StringBuilder stringBuilder = new StringBuilder();
private final RequestQueue queue;

public StringBuilder getstringBuilder() {
    return stringBuilder;
}

public void setModelFromNetwork() {
    final String url = "https://www.themealdb.com/api/json/v1/1/random.php";
    StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            response -> {
                try {
                    stringBuilder.append(response.toString());
                } catch (JSONException e) {
                    System.out.println("JSONException occurred. The error is: ");
                    e.printStackTrace();
                }
            }, exception -> System.out.println("Error"));
    queue.add(stringRequest);
}

public NetworkController(@NonNull final Activity activity) {
    queue = Volley.newRequestQueue(activity.getApplicationContext());
}
}