Tells the fragment that all of the saved state in its view hierarchy has been restored. As we’ll see, the activity’s onCreate is (indirectly) responsible for causing several of the fragment’s lifecycle events to be called, and the fragment’s onCreate method is called before the activity’s onCreate method has been completed. For fragments defined in XML, however, this offers the fragment the opportunity to obtain any XML arguments that were part of its definition.Ĭalled after the fragment has been associated with an activity.Ĭalled when it is time for the fragment to create its own view structure.Ĭalled once the fragment’s activity’s onCreate has been completed. This method is not traditionally mentioned as part of the lifecycle events, as not all fragments will go through it. The activity is being destroyed, either because of a call to finish() or because the system needs the space.Ī Fragment has all of those methods, plus the following additional ones: Method Another activity may be completely obscuring this one, or it may be on its way to being destroyed. The activity is no longer visible to the user. Another activity may have started on top of it, or the user may have backed out of this activity. The activity is no longer on the top of the activity stack. It is now on the top of the activity stack, with any input from the user going to it. The activity will begin interacting with the user. The activity is becoming visible to the user. This method also provides you with a Bundle containing the activity’s previously frozen state, if there was one.Ĭalled if your activity has been stopped and is now being restarted. This is where you normally do your view setup, etc. Īs you’re probably aware at this point, an Activity can define the following lifecycle callbacks: MethodĬalled when the activity is first created. Code for this particular post may be found at. Thus, I’ve set out to remedy that particular lack with this blog post. One thing that I have found lacking, however, is a detailed examination of the relationship between the two – in particular, exactly what events trigger what other events. the onStart() method is a good place to do begin drawing visual effects.There are numerous articles on the Internet that provide an overview of the Android Activity lifecycle, as well as the corresponding Fragment lifecycle. It is also at this point that the fragment is visible to the user. Also, when the STARTED state is entered the onStart() method is invoked. Once the fragment enters this state, it is guaranteed that the fragment's view is available.It will give you a much deeper understanding on how the lifecycle actually works. If you have gotten this far and not created your own app, I would recommend that you try to build your own and release it to the Google play store. the view parameter of onViewCreated() is the inflated view returned from onCreateView().įor most beginner applications you only need to really to understand the CREATED state and the methods it calls. onViewCreated() is the last method called and it is where any view related work should be done. It is in onCreateView() that you can manually inflate the view by using the LayoutInflater class. onCreateView() is called after onCreate() but before onViewCreated(). It is used for reinitializing previously saved data form the savedInstanceState state. Remember that fragments can not exist on their own and must be hosted by either a activity or another fragment.Įnter fullscreen mode Exit fullscreen modeįrom the code above: onCreate() is called right after onAttach() and before the other two methods. Once the fragment has been added to the Fragment Manager, the onAttach() callback is invoked to attach the fragment to it host activity. The Fragment Manager is responsible for determining what state a fragment should be in and then moving it to that state. For a fragment to then transition through the rest of its lifecycle, it must be added to a Fragment Manager.
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