Скачать или смотреть Why is onCreateView() Not Called for Fragment 3 When Navigating Directly from F2 to F3?

Explore why onCreateView() is not called for Fragment 3 when navigating directly from Fragment 2 to Fragment 3 in the Android Fragment Life Cycle.
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Navigating through different fragments in an Android application can sometimes lead to unexpected behavior in the fragment lifecycle methods. One such case is when onCreateView() is not called for Fragment 3 (F3) when navigating directly from Fragment 2 (F2). Understanding the Android Fragment Lifecycle can help clarify why this happens.

Android Fragment Lifecycle Basics

To comprehend the occurrence, it’s essential to have a basic understanding of how fragments work in Android. A fragment goes through several lifecycle stages:

onAttach()

onCreate()

onCreateView()

onActivityCreated()

onStart()

onResume()

onPause()

onStop()

onDestroyView()

onDestroy()

onDetach()

Navigation and Fragment Lifecycle

When navigating between fragments, typically one expects the lifecycle methods to be called in a particular order. However, this can be influenced by how fragments are managed and navigated within the app.

Direct Navigation:

When an app directly navigates from F2 to F3, it might seem logical that F3's onCreateView() should always be invoked.

Fragment Reuse:

In some scenarios, the Android system may decide to reuse the fragment that has already been created. This leads to skipping the onCreateView() if the view hierarchy is already in place.

Reasons for onCreateView() Not Being Called

The specific reasons for onCreateView() not being called can depend on several factors:

Fragment Manager: If a fragment is being reused by the FragmentManager, then onCreateView() will not be called again since the view already exists.

Caching Strategies: Android may use caching mechanisms for fragments. If the fragment's view was retained in an appropriate state, there might be no need to recreate it.

Navigation Policies: How the app handles navigation and fragment transactions can also play a role. For instance, if a fragment transaction does not detach the previous fragment's view fully, onCreateView() might be skipped upon re-visit.

Tips for Handling Fragment Lifecycle Anomalies

Understanding the possibility of skipped lifecycle calls can help developers manage their code more effectively:

Check Existence: Always verify if the view already exists in onCreateView().

Handling Transitions: Be cautious about how fragments are replaced or attached.

State Management: Properly manage the state within onSaveInstanceState() and onDetach() methods.

By comprehending these nuances in fragment lifecycle handling, developers can ensure smoother navigation experiences within their applications.