---
title: 'Vaandroid Utility Classes'
url: 'https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources/vaandroid-utility-classes'
markdown: 'https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources/vaandroid-utility-classes.md'
date: '2026-09-25'
description: 'Utility classes for Vaandroid development. Activi'
taxonomy:
  category:
    - docs
  devtype:
    - private
---

[](#)  [ Home ](https://www.twelvetone.tv/docs/)     [ Operating Systems ](https://www.twelvetone.tv/docs/operating-systems)     [ Vaandroid ](https://www.twelvetone.tv/docs/operating-systems/vaandroid)     [ Vaandroid Developer Guide ](https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide)     [ Resources ](https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources)      Vaandroid Utility Classes    

Utility classes for Vaandroid development.

# Activity Helper

A utility for activities and fragments to manage

- subscriptions
- UI Threading
- Alerts
- Messages

# Processor Manager

A utility for activities and fragments to manage processors.

# Vaandroid Activity

A subclasss of Activity that incorporates ActivityHelper and ProcessorManager. It also facilitates option menu handling.

## Processor Support

The activiy must call invalidateOptionsMenu() after any selection changes to update the processor menus.

void registerProcessorClass(Class aClass, String caption)Marks the given interface a processor for selected items in the activity. All processors will be added to a menu item having the given caption.protected  Collection getProcessorItems(Class aClass)Override this method to inform the superclass of the selected items. The processor menu item states will be updated based on the returned value.## Event Bus Support

Subscribe to system events, and automatically unsubscribe when the activity is finished.

todo: document

## Alert Support

todo: document

 [ ](https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources) [](https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources/compatibility-check)

---

## Navigation

- Parent: [Resources](https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources.md)
- Next: [Compatibility Check](https://www.twelvetone.tv/docs/operating-systems/vaandroid/vaandroid-developer-guide/resources/compatibility-check.md)