FragmentStateAdapter.FragmentTransactionCallback

Artifact: androidx.viewpager2:viewpager2

View Source

Added in 1.1.0

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Kotlin |Java

public abstract class FragmentStateAdapter.FragmentTransactionCallback

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

Summary

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

Public constructors
FragmentTransactionCallback()

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

Public constructors

FragmentTransactionCallback

Added in 1.1.0

public FragmentTransactionCallback()

Public methods

onFragmentMaxLifecyclePreUpdated

Added in 1.1.0

public @NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener onFragmentMaxLifecyclePreUpdated(
    @NonNull Fragment fragment,
    @NonNull Lifecycle.State maxLifecycleState
)

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

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

Returns
@NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreAdded

Added in 1.1.0

public @NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener onFragmentPreAdded(@NonNull Fragment fragment)

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

Parameters
@NonNull Fragment fragment	Fragment changing state

Returns
@NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreRemoved

Added in 1.1.0

public @NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener onFragmentPreRemoved(@NonNull Fragment fragment)

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

Parameters
@NonNull Fragment fragment	Fragment changing state

Returns
@NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation

onFragmentPreSavedInstanceState

Added in 1.1.0

@FragmentStateAdapter.ExperimentalFragmentStateAdapterApi
public @NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener onFragmentPreSavedInstanceState(@NonNull Fragment fragment)

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

Parameters
@NonNull Fragment fragment	Fragment which state is being saved

Returns
@NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener	Listener called after the operation