Tell about your experience with streams and multithreading in projects.

In Android projects, I used multithreading to perform long-running operations outside the main UI thread to avoid blocking the user interface. Most often, I used classes like Thread, Runnable, as well as more modern approaches with AsyncTask (although it is now deprecated) and ExecutorService for managing thread pools.

I also actively used Handler and HandlerThread for message passing between threads and updating the UI from background tasks. In modern projects, I apply Kotlin Coroutines, which greatly simplify asynchronous programming and thread management.

Example of creating and starting a thread in Java:

new Thread(new Runnable() {
    @Override
    public void run() {
        // Long operation
        doBackgroundWork();
        // UI update via Handler or runOnUiThread
    }
}).start();

Thus, multithreading helps improve application responsiveness and efficiently utilize device resources.