Qt android : How can I use a java file without registering it as the main activity in the manifest?

Question

I can use JNI to issue a notification using a java file. The only way I can do that is by replacing the activity line in the manifest like so: From:

<activity android:name="org.qtproject.qt5.android.bindings.QtActivity" >

To the path for the java file:

<activity android:name="org.qtproject.example.notification.NotificationClient" >

or else the notifications won't show up!

What if I want to Use more than one Java file to do other stuff using JNI? How can I add more than one activity in the manifest?

This is my NotificationClient.java:

package org.qtproject.example.notification;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.app.PendingIntent;
import android.app.Activity;
import org.qtproject.qt5.android.bindings.QtActivity;

public class NotificationClient extends org.qtproject.qt5.android.bindings.QtActivity
{
    private static NotificationManager m_notificationManager;
    private static Notification.Builder m_builder;
    private static NotificationClient m_instance;
    private static PendingIntent contentIntent;
    private static Intent intent;

    public NotificationClient()
    {
        m_instance = this;

    }

    public  static void notify(String s)
    {
        if (m_notificationManager == null) {
            m_notificationManager = (NotificationManager)m_instance.getSystemService(Context.NOTIFICATION_SERVICE);
            m_builder = new Notification.Builder(m_instance);
            m_builder.setSmallIcon(R.drawable.icon2);

            m_builder.setDefaults(Notification.DEFAULT_SOUND);
            m_builder.setContentTitle("A message from Qt!");
        }

    intent = new Intent(m_instance, NotificationClient.class);
    contentIntent = PendingIntent.getActivity(m_instance, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

m_builder.setContentIntent(contentIntent);

       m_builder.setContentText(s);
       m_notificationManager.notify(1, m_builder.build());
    }
}