How to Refresh a View within a Fragment in Android

What are the best techniques to update or refresh a view within a Fragment in Android?

// Example of refreshing a TextView inside a Fragment
textView.setText("New Text");
// Notify the Fragment's ViewModel to update data if necessary
viewModel.updateData(newData);

Refreshing a view in a fragment involves updating its UI elements based on new data or user interactions. This ensures that the UI reflects the latest state of the data.

// Refreshing a view on Fragment resume
@Override
public void onResume() {
    super.onResume();
    // Refresh your view here
    textView.setText(getUpdatedText());
}

Causes

• User interactions that require the UI to reflect changes
• Data loaded from a database or network that has changed
• Lifecycle events that require UI updates, such as onResume()

Solutions

• Use findViewById to access the view and update it directly.
• Implement a ViewModel to hold UI-related data that survives configuration changes, allowing the Fragment to update automatically.
• Call the appropriate methods in the fragment's lifecycle, such as onResume() or onViewCreated(), to refresh views that depend on dynamic data.

Mistake: Not updating the UI on the main thread.

Solution: Ensure UI updates are performed on the UI thread using runOnUiThread if necessary.

Mistake: Neglecting to use ViewModel for data retention.

Solution: Implement ViewModel to retain UI data across configuration changes, preventing UI loss in Fragment.