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I am trying to see if it is possible to create an observable, that would notify when action bar visibility changes.

Something in a way of

LiveData<Boolean> actionBarVisibility;

So that other UI can be updated when actionBar is shown/hidden? I found this little trick to identify the view visibility change events, but cannot figure out how to apply it to actionBar, since its view is not accessible to me.

Paul
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1 Answers1

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Yes, you can observe the state of Boolean!

Inside ViewModel

var isActionBarVisible: MutableLiveData<Boolean> = MutableLiveData()

set visibility 

isActionBarVisible.postValue(true)

set invisibility 

isActionBarVisible.postValue(false)

====

Inside View (Activity or Fragment)

viewProvider!!.isActionBarVisible.observe(this, Observer {
        if (it!!) {
            // on visible of action bar
        } else {
           // on invisible of action bar
        }
    })
Kishore Jethava
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    I am sorry, but that is not the question I asked - observing a boolean is simple, I agree, how do I hook into ActionBar of an activity, to update that value when visibility actually changes? – Paul Feb 09 '19 at 00:23