setOnClickListener

setOnClickListener is a method used in Android development to define what happens when a user clicks on a View object, such as a button or an image. When you call setOnClickListener on a View, you provide it with a listener object that implements the View.OnClickListener interface. This interface has a single method, onClick(), which is automatically executed by the Android system whenever the user taps the View. Inside the onClick() method, you write the code that you want to run in response to the click event. This could involve starting a new activity, displaying a message, updating the user interface, or performing any other desired action. It's a fundamental part of making Android applications interactive. The listener object is typically an anonymous inner class or a lambda expression, allowing for concise definition of click behavior directly where it's needed. This mechanism separates the UI element from the action it performs, promoting cleaner code organization.