How does the system ensure timely updating of the displayed data on the screen?

In Android, timely updating of displayed data on the screen is ensured through the UI thread update mechanism (main thread). When data changes, for example, in the model or ViewModel, a method is called that updates the view, such as calling notifyDataSetChanged() on the adapter or through LiveData, which automatically notifies observers and updates the UI.

Main methods:

• Using LiveData or Flow, which trigger UI updates when data changes.
• Calling methods of RecyclerView or ListView adapters to redraw items.
• Updating the UI only on the main thread to avoid conflicts.

Example with LiveData:

viewModel.data.observe(this) { newData ->
    adapter.submitList(newData)
}

Thus, the system ensures timely screen redraws when data changes through observers and adapter update calls.