Trying to build USSD dialing extension.

Extensions Extension Development
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#1

I Want to make a ussd extension that dial ussd, get Responce, and reply to it

The code is below:

package ussd.ext.kodular;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.telephony.TelephonyManager;
import android.util.Log;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.EventDispatcher;

@DesignerComponent(
        version = 1,
        description = "Perform Ussd Functions",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,
        iconName = "")

@SimpleObject(external = true)
public class UssdExt extends AndroidNonvisibleComponent {

    //Activity and Context
    private Context context;
    private Activity activity;

    public UssdExt(ComponentContainer container){
        super(container.$form());
        this.activity = container.$context();
        this.context = container.$context();
    }

    @SimpleFunction(description = "Dial a USSD code and get the response")
    public void dialUssdCode(final String ussdCode){
        if (hasPermissions()) {
            new AsyncTask<Void, Void, Void>() {
                protected Void doInBackground(Void... params) {
                    try {
                        TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
                        if (telephonyManager != null) {
                            telephonyManager.sendUssdRequest(ussdCode, new TelephonyManager.UssdResponseCallback() {
                                public void onReceiveUssdResponse(final CharSequence response) {
                                    Log.d("USSD Response", response.toString());
                                    // Trigger an event to pass the response back to the app
                                    activity.runOnUiThread(new Runnable() {
                                        public void run() {
                                            UssdResponseReceived(response.toString());
                                        }
                                    });
                                }

                                public void onReceiveUssdResponseFailed(int failureCode) {
                                    Log.d("USSD Response", "Failed with code: " + failureCode);
                                    // Trigger an event to indicate the failure
                                    UssdResponseFailed(failureCode);
                                }
                            }, null);
                        }
                    } catch (SecurityException e) {
                        e.printStackTrace();
                    }
                    return null;
                }
            }.execute();
        } else {
            Log.d("USSD Response", "Permissions not granted");
        }
    }

    private boolean hasPermissions() {
        return (activity.checkSelfPermission(android.Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED &&
                activity.checkSelfPermission(android.Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED);
    }

    @SimpleEvent(description = "Event triggered when a USSD response is received")
    public void UssdResponseReceived(String response){
        EventDispatcher.dispatchEvent(this, "UssdResponseReceived", response);
    }

    @SimpleEvent(description = "Event triggered when a USSD request fails")
    public void UssdResponseFailed(int errorCode){
        EventDispatcher.dispatchEvent(this, "UssdResponseFailed", errorCode);
    }

    @SimpleFunction(description = "Reply to a USSD message")
    public void replyToUssd(String message){
        // Implement reply functionality here
    }
}

But its not working. I dont know why. Can any one help me please?