Set fragment title and [un]register callbacks in onStart/onStop
onStart() is called when the fragment is made visible, whereas onPause() is called when the fragment looses focus e.g. if a dialog is shown. Thus: - there is no need to set the activity's title everytime the fragment regains focus, - it is better to listen to event tasks and refresh the state of the UI while the fragment is actually visible, listening to events until the fragment is destroyed is useless: if an event is received between onStop() and onDestroy(), there will be some processing but nothing will be shown because the fragment is no longer visible.
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