![]() View of Fragment A is recreated and Fragment B is destroyed OnDestroy and onDetach method of Fragment A is NOT called.Unlike a simple replace, when you add your replace transaction to the backstack you’re actually keeping the first fragment attached to it’s activity, only its view is destroyed. ![]() When Fragment B replaces Fragment A keeping it in backstack getActivity (). onDestroy and onDetach method of Fragment A will not be called. When Fragment B replaces Fragment A,Fragment A is destroyed and Fragment B is created.However in case the transaction that had added Fragment A was saved using addToBackStack method,then backstack is holding reference to that fragment from previous transaction and hence only its view is destroyed.i.e. When Fragment B replaces Fragment A getActivity (). Since fragment B was added on top of A, fragment A is not affected by the removal of B. No lifecycle methods of Fragment A is being called Simply adding another fragment will just display fragment B over fragment A and no life cycle callbacks of fragment A should be called. ![]() No lifecycle methods of Fragment A is being called.įragment A will only be affected if it’s removed or replaced. When Fragment B is added to Fragment A getActivity (). If you want to stay updated with all the latest articles, subscribe to the weekly newsletter by entering your email address in the form on the top right section of this page.The post covers what all lifecycle’s methods of fragment are normally called during different cases of fragment transaction.It also covers the effect of setting setAllowOptimization()/setReorderingAllowed() to true on the lifecycle during fragment transaction.The method calls are listed in the sequence in which they are called as per latest appcompat version 27.0.2.Suppose two fragments A and B are there and we are performing transaction between them. You can follow me on LinkedIn, Twitter, Quora, and Medium where I answer questions related to Mobile Development, especially Android and Flutter. If you like any article, do give it a share on Facebook, Linkedin. Just post a question and people would be ready to help you out □Ĭlick on this link to join the AndroidVille SLACK workspace. We also have channels to help you with any questions, dev-help that you require. We have a SLACK workspace where we share updates related to new job opportunities, articles on Mobile Development/updates from the industry. What this means is if you try to retrieve fragments by TAG in your activity, you won’t find it if you’ve replaced the fragment instead of adding over it.ĪndroidVille is a community of Mobile Developers where we share knowledge related to Android Development, Flutter Development, React Native Tutorials, Java, Kotlin and much more. But if you call replace, the fragment in the container will be replaced by the new one. Activity is destroyed first and then the fragment.Īs the name suggests, when you add a fragment, it’s added on top of the one already in the container. When fragment is added to activity statically then fragment is eagerly created. I was also surprised when I saw this lifecycle callback sequence. So, onPause, onStop and onDestroy of activity are called first before fragment’s respectively. Here, the activity is destroyed first and then the fragment. Finally Activity and Fragment’s onResume is called respectively. Then fragment’s onCreate, onCreateView and onStart are called. Activity’s onCreate, onStart are called first. You can see here that the activity is eagerly created. When we add a fragment dynamically, the following callback sequence occurs. class LifecycleFragment : Fragment() Android Fragment Lifecycle callback sequenceįinally, let’s see what the lifecycle callback sequence is in the fragments when we run the app. Also create a simple layout xml if not already created. In this project, add a fragment called LifecycleFragment and override the lifecycle methods. This will be a basic project where we’ll just add basic log statements in all of the lifecycle methods. First by adding a fragment Dynamically and then Statically.Ĭreate a new Project in Android Studio. We’ll analyse the fragment lifecycle in two ways. To study their call sequence, I created a sample project. These make up the fragment lifecycle in android.
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