How to call an android notification plugin if it's not the main activity?

Hello,

I tried to call an android plugin without using it as the main activity.

If in my manifest I declare it as the main activity is working using this :

 AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
             AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity");
             jo.Call("createNotification", new object[] { "Test", "Test" ", "Test", time });

But how can I call it if it's not my main activity?

Thanks

This is my classes in my jar file :

NotificationActivity.java :

 package com.test.me;
 
 import com.unity3d.player.UnityPlayerActivity;
 
 import android.app.AlarmManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 
 public class NotificationActivity extends UnityPlayerActivity {
     /** Called when the activity is first created. */
      AlarmManager am;
     
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
     }
     
     public void test() {
         Log.d("test", "test");
         
     }
 
     public void createNotification(String tickerText, String contentTitle, String contentText, int time) {
         
         am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
         
         Intent intent = new Intent(this, TimeAlarm.class);
             //intent.putExtra("tickerText",tickerText);
             //intent.putExtra("contentTitle",contentTitle);
             intent.putExtra("contentText",contentText);
             
             PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
           intent, PendingIntent.FLAG_ONE_SHOT);
             
             am.set(AlarmManager.RTC_WAKEUP,
           System.currentTimeMillis() + (time * 1000), pendingIntent);
             
     }
     
     public void cancelNotification() {
         am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
         Intent intent = new Intent(this, TimeAlarm.class);
         PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
         intent, PendingIntent.FLAG_ONE_SHOT);
                     
         am.cancel(pendingIntent);
         
     }
     
   } 

This is TimeAlarm.java

 package com.test.me;
 
 import java.util.UUID;
 
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 
 public class TimeAlarm extends BroadcastReceiver {
 
      NotificationManager nm;
 
      @Override
      public void onReceive(Context context, Intent intent) {
          String tickerText = "test";
          String contentTitle = "test";
          String contentText = intent.getStringExtra("contentText");
          
       nm = (NotificationManager) context
         .getSystemService(Context.NOTIFICATION_SERVICE);
       
       PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
         new Intent(), 0);
       
       Notification notif = new Notification(R.drawable.ic_launcher,
               tickerText, System.currentTimeMillis());
       
       notif.flags |= Notification.FLAG_AUTO_CANCEL;
       notif.defaults = Notification.DEFAULT_ALL;
       
       notif.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
       Integer uid = (int) (long)  UUID.randomUUID().getMostSignificantBits();
       nm.notify(uid, notif);
      }
     }