FragmentStateAdapter.FragmentTransactionCallback

Artifact: androidx.viewpager2:viewpager2

View Source

Added in 1.1.0

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Kotlin |Java

abstract class FragmentStateAdapter.FragmentTransactionCallback

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

Summary

Nested types
interface FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener Callback returned by onFragmentPreAdded, onFragmentPreRemoved, onFragmentMaxLifecyclePreUpdated called after the operation ends.

Public constructors
FragmentTransactionCallback()

Public functions
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	onFragmentMaxLifecyclePreUpdated(     fragment: Fragment,     maxLifecycleState: Lifecycle.State ) Called right before Fragment's maximum state is capped via setMaxLifecycle.
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	onFragmentPreAdded(fragment: Fragment) Called right before the Fragment is added to adapter's FragmentManager.
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	onFragmentPreRemoved(fragment: Fragment) Called right before the Fragment is removed from adapter's FragmentManager.
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	@FragmentStateAdapter.ExperimentalFragmentStateAdapterApi onFragmentPreSavedInstanceState(fragment: Fragment) Called right before Fragment's state is being saved through a saveFragmentInstanceState call.

Public constructors

FragmentTransactionCallback

Added in 1.1.0

FragmentTransactionCallback()

Public functions

onFragmentMaxLifecyclePreUpdated

Added in 1.1.0

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

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

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

Returns
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreAdded

Added in 1.1.0

fun onFragmentPreAdded(fragment: Fragment): FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

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

Parameters
fragment: Fragment	Fragment changing state

Returns
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreRemoved

Added in 1.1.0

fun onFragmentPreRemoved(fragment: Fragment): FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

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

Parameters
fragment: Fragment	Fragment changing state

Returns
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreSavedInstanceState

Added in 1.1.0

@FragmentStateAdapter.ExperimentalFragmentStateAdapterApi
fun onFragmentPreSavedInstanceState(fragment: Fragment): FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

Called right before Fragment's state is being saved through a saveFragmentInstanceState call.

Parameters
fragment: Fragment	Fragment which state is being saved

Returns
FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation