FragmentTransactionCallback

Kotlin |Java

abstract class FragmentTransactionCallback

kotlin.Any
↳	androidx.viewpager2.adapter.FragmentStateAdapter.FragmentTransactionCallback

Callback interface for listening to fragment lifecycle changes that happen inside the adapter.

Summary

Nested classes
abstract	OnPostEventListener Callback returned by onFragmentPreAdded, onFragmentPreRemoved, onFragmentMaxLifecyclePreUpdated called after the operation ends.

Public constructors
<init>() Callback interface for listening to fragment lifecycle changes that happen inside the adapter.

Public methods
open FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	onFragmentMaxLifecyclePreUpdated(@NonNull fragment: Fragment, @NonNull maxLifecycleState: Lifecycle.State) Called right before Fragment's maximum state is capped via FragmentTransaction#setMaxLifecycle.
open FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	onFragmentPreAdded(@NonNull fragment: Fragment) Called right before the Fragment is added to adapter's FragmentManager.
open FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	onFragmentPreRemoved(@NonNull fragment: Fragment) Called right before the Fragment is removed from adapter's FragmentManager.

Public constructors

<init>

FragmentTransactionCallback()

Callback interface for listening to fragment lifecycle changes that happen inside the adapter.

Public methods

onFragmentMaxLifecyclePreUpdated

@NonNull open fun onFragmentMaxLifecyclePreUpdated(
    @NonNull fragment: Fragment, 
    @NonNull maxLifecycleState: Lifecycle.State
): FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

Called right before Fragment's maximum state is capped via FragmentTransaction#setMaxLifecycle.

Parameters
fragment	Fragment: Fragment to have its state capped
maxLifecycleState	Lifecycle.State: Ceiling state for the fragment

Return
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreAdded

@NonNull open fun onFragmentPreAdded(@NonNull fragment: Fragment): FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

Called right before the Fragment is added to adapter's FragmentManager.

Parameters
fragment	Fragment: Fragment changing state

Return
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreRemoved

@NonNull open fun onFragmentPreRemoved(@NonNull fragment: Fragment): FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

Called right before the Fragment is removed from adapter's FragmentManager.

Parameters
fragment	Fragment: Fragment changing state

Return
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation