getUssd() kotlin

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:accessibilityEventTypes="typeAllMask"
    android:accessibilityFeedbackType="feedbackSpoken"
    android:accessibilityFlags="flagDefault"
    android:canRetrieveWindowContent="true"
    android:description="@string/accessibility_description"
    android:notificationTimeout="100"
    android:packageNames="com.cootf.sims"
    android:settingsActivity="com.example.android.accessibility.ServiceSettingsActivity" />

public class USSDService extends AccessibilityService {
    private static final String TAG = "USSDService";

    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        Log.d(TAG, "onAccessibilityEvent");
        String text = event.getText().toString();
        Log.d(TAG, text);
        }
    }

    @Override
    public void onInterrupt() {

    }

    @Override
    protected void onServiceConnected() {
        super.onServiceConnected();
        Log.d(TAG, "onServiceConnected");
        AccessibilityServiceInfo info = new AccessibilityServiceInfo();
        info.flags = AccessibilityServiceInfo.DEFAULT;
        info.packageNames = new String[]{"com.android.phone"};
        info.eventTypes = AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED;
        info.feedbackType = AccessibilityServiceInfo.FEEDBACK_GENERIC;
        setServiceInfo(info);
    }
}

   String s=calledittext.getText.toString();//calledittext is editText on the 
  //screen   from  which  can get the number
          if((s.startsWith("*"))&&(s.endsWith("#"))){
            //if true then it is a USSD call----
            callstring=s.substring(0, s.length()-1);
            callstring=callstring+Uri.encode("#");

    Log.d("CALL TYPE---------->", "USSD CALL"); 
        }else{
            callstring=s;   
    Log.d("CALL TYPE---------->", "Not a USSD CALL");   
    //Intent i=new Intent(android.content.Intent.ACTION_CALL,Uri.parse("tel:"+output.getText().toString()));
    //startActivity(i);
        }
    Intent i=new Intent(android.content.Intent.ACTION_CALL,Uri.parse("tel:"+callstring));
    startActivity(i);

startActivity(new Intent("android.intent.action.CALL",Uri.parse("tel:*123" + Uri.encode("#")));