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In Android, the main ways to handle events or requests include:

• Event Listeners — interfaces implemented to handle user actions, such as button clicks (OnClickListener).
• Message handling via Handler and Looper — allows managing the message queue and executing tasks in the main or background thread.
• BroadcastReceiver — for handling broadcast messages from the system or other applications.
• AsyncTask (deprecated) and modern alternatives (e.g., Coroutines) — for executing asynchronous tasks and handling results.

Example of a simple button click handler:

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Handle click
    }
});