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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesgreenrobot EventBus is a publish-subscribe library for Java and Android: one component posts an event object, and registered subscribers receive it through annotated handler methods. “EventBus” is also used by unrelated libraries, so this guide specifically covers greenrobot’s Android/Java project.
What greenrobot EventBus does
EventBus lets components communicate without directly calling or depending on one another. A publisher posts an object describing something that happened or information to share. Subscriber objects register with the bus and declare which event types they handle using methods annotated with @Subscribe. The bus delivers a posted event to matching handlers.
This is an in-process communication mechanism for Java and Android applications. It is not a network message broker, persistent event log, cross-process transport, or guarantee that messages will be delivered after an application stops.
How event delivery works
- Define an event object. Create a Java object for the event or data to be shared. The project’s getting-started example uses a
MessageEventclass. - Write a subscriber handler. Add a public method that returns
void, takes exactly one event parameter, and has the@Subscribeannotation. The annotation can also specify delivery options such as thread mode and priority. - Register the subscriber. Call
register(subscriber)on the EventBus instance. The subscriber stays registered until it is unregistered. - Post an event. Call
post(eventObject). EventBus dispatches it to the matching registered handlers. - Unregister when finished. Call
unregister(subscriber)when that subscriber should no longer receive events.
This abbreviated example illustrates the API; it is not a complete application:
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@Subscribe(threadMode = ThreadMode.MAIN)
public void onMessageEvent(MessageEvent event) {
// Update UI or otherwise handle the event.
}
EventBus.getDefault().register(this);
EventBus.getDefault().post(new MessageEvent());
EventBus.getDefault().unregister(this);EventBus.getDefault() uses the default singleton instance. Applications can instead construct separate EventBus instances; each instance has its own delivery scope.
Register and unregister Android subscribers with their lifecycle
For an Android Activity or Fragment, registration should match the period in which it is meant to receive events. The project’s example registers in onStart and unregisters in onStop. The right lifecycle callbacks depend on the component and app design.
Rank #2
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Leaving a subscriber registered beyond its intended lifetime can result in unwanted event delivery and retained references. Pair registration with cleanup at the appropriate lifecycle boundary rather than treating registration as a one-time setup with no teardown.
Delivery options and sticky events
- Thread mode: A subscriber can configure how its handler receives events. The project’s quick example uses
ThreadMode.MAIN; consult documentation for the version in use for the complete set of modes and their behavior. - Priority: Subscriber methods can specify a priority. The exact implications should be checked against the corresponding version’s API documentation.
- Sticky events:
postStickystores the most recent sticky event of a type in memory so a later subscriber can retrieve it. The API also offers methods to retrieve or remove sticky events. This is a short-lived in-memory convenience, not durable storage. - Separate buses: A newly constructed EventBus instance has a separate event-delivery scope. Use the default singleton when a process-wide bus is appropriate, or distinct instances when the application needs isolated scopes.
What “EventBus” might mean
The name is not unique. greenrobot’s project targets Android and Java, while Guava documents a separate in-process Java EventBus and JavaScript packages also use the EventBus name. Their APIs, platform assumptions, and delivery behavior are not interchangeable. Confirm the publisher, language, and platform before following installation instructions or examples.
Rank #3
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Installation and license
greenrobot’s repository lists version 3.3.1 for Android as org.greenrobot:eventbus:3.3.1 and for Java as org.greenrobot:eventbus-java:3.3.1, with both available on Maven Central. These are the coordinates listed by the repository; check its current instructions when adding the dependency. The repository identifies the source and binaries as available under the Apache License 2.0.
The project recommends using its annotation processor to generate a subscriber index, citing reflection-related problems encountered in real use. Treat that as the project’s recommendation, not as a universal performance guarantee.
Rank #4
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Sources: greenrobot EventBus project and README; greenrobot EventBus documentation; Guava EventBus documentation.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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