What are the ways to work with the main thread in…

There are various ways to interact with the main thread (UI thread) in Android:

runOnUiThread() Method in Activity: Executes a given Runnable on the main thread.

// In Activity
runOnUiThread(new Runnable() {
    @Override
    public void run() {
        // Code executed on the main thread
    }
});

Handler Class: Allows sending messages and executing Runnable on a specific thread (including the main thread if linked with its Looper).

// In Activity or another class with access to the main thread's Looper
Handler mainHandler = new Handler(Looper.getMainLooper());
mainHandler.post(new Runnable() {
    @Override
    public void run() {
        // Code executed on the main thread
    }
});

RxJava/Kotlin Coroutines: Modern approaches for asynchronous work, providing convenient mechanisms for switching between threads.

// Kotlin Coroutines
lifecycleScope.launch(Dispatchers.Main) {
    // Code executed on the main thread
}

// RxJava
Observable.just("data")
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(data -> {
        // Code executed on the main thread
    });

View.post(): Executes a given Runnable on the main thread after the view has been added to the window hierarchy.

// On any View
myView.post(new Runnable() {
    @Override
    public void run() {
        // Code executed on the main thread
    }
});

Callback interfaces: Some Android components (e.g., Loaders, AsyncTasks — although the latter are deprecated) provide callback methods that are called on the main thread.

LiveData: When using LiveData, observers receive updates on the main thread by default.

myData.observe(this, Observer { data ->
    // Code executed on the main thread when data changes
})

What are the ways to work with the main thread in Android?