Android: how to notify Activity when Fragments views are ready?

Question

I\'m using Google Maps API V2 in an activity wih drop down navigation where the map is on the second position.

I\'m adding the map pragmatically like:

Answer 1

If you want to do it without any listener:

Add Fragment with a TAG

 supportFragmentManager
                .beginTransaction()
                .add(R.id.pagerContainer, UniversalWebViewFragment.newInstance(UniversalWebViewFragment.YOUTUBE_SERACH_URL+"HD trailers"), 
                "UniversalWebView")
                .disallowAddToBackStack()
                .commit()

Create a public method in Hosting Activity class which you want to call after fragment is loaded. Here I am calling back a method of my fragment for example

public fun loadURL() {
        val webViewFragment = supportFragmentManager
                              .findFragmentByTag("UniversalWebView") 
                               as UniversalWebViewFragment

        webViewFragment.searchOnYoutube("Crysis Warhead")
    }

Now inside onViewCreated Method of your fragment you can simply call that public method of Host activity like this:

    (activity as HomeActivity ).loadURL()