Handler Pattern in Java Explained

In Java, the Handler pattern is a design pattern used to send requests to the appropriate handler. This pattern is commonly used for dispatching and handling requests or events. The Handler pattern typically includes a chain of handlers, each with a method to handle requests, and the option to pass the request to the next handler.

In Android development, the Handler pattern is commonly used to facilitate communication between the UI thread and background threads. By using a Handler, messages or tasks can be sent to the UI thread’s message queue and processed on the main thread. This helps ensure the safety of UI updates and prevents time-consuming operations from being performed outside of the UI thread.