FragmentStateAdapter.FragmentTransactionCallback

public abstract class FragmentStateAdapter.FragmentTransactionCallback

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

Summary

Nested types

Callback returned by onFragmentPreAdded, onFragmentPreRemoved, onFragmentMaxLifecyclePreUpdated called after the operation ends.

Public constructors

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

Called right before the Fragment is added to adapter's FragmentManager.
@NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

Called right before the Fragment is removed from adapter's FragmentManager.
@NonNull FragmentStateAdapter.FragmentTransactionCallback.OnPostEventListener

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