Package icyllis.modernui.fragment

Class FragmentHostCallback<E>

java.lang.Object

icyllis.modernui.fragment.FragmentHostCallback<E>

Type Parameters:

E - the type of object that's currently hosting the fragments. An instance of this class must be returned by onGetHost().

public abstract class FragmentHostCallback<E>
extends Object

Integration points with the Fragment host.

Fragments may be hosted by any object. In order to host fragments, implement FragmentHostCallback, overriding the methods applicable to the host.

FragmentManager changes its behavior based on what optional interfaces your FragmentHostCallback implements. This includes the following:

• FragmentOnAttachListener: Removes the need to manually call FragmentManager.addFragmentOnAttachListener(icyllis.modernui.fragment.FragmentOnAttachListener) from your host in order to receive FragmentOnAttachListener.onAttachFragment(icyllis.modernui.fragment.FragmentManager, icyllis.modernui.fragment.Fragment) callbacks for the FragmentController.getFragmentManager().
• OnBackPressedDispatcherOwner: Removes the need to manually call FragmentManager.popBackStackImmediate() when handling the system back button.

Constructor Summary

Constructors

Constructor	Description
FragmentHostCallback(Context context, Handler handler)

Method Summary

Modifier and Type	Method	Description
void	onDump(String prefix, FileDescriptor fd, PrintWriter writer, String... args)	Print internal state into the given stream.
View	onFindViewById(int id)
abstract E	onGetHost()	Return the object that's currently hosting the fragment.
boolean	onHasView()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

FragmentHostCallback

public FragmentHostCallback(@NonNull
 Context context,
 @NonNull
 Handler handler)

Method Details

onDump

public void onDump(@NonNull
 String prefix,
 @Nullable
 FileDescriptor fd,
 @NonNull
 PrintWriter writer,
 @Nullable
 String... args)

Print internal state into the given stream.

Parameters:

prefix - Desired prefix to prepend at each line of output.

fd - The raw file descriptor that the dump is being sent to.

writer - The PrintWriter to which you should dump your state. This will be closed for you after you return.

args - additional arguments to the dump request.

onGetHost

@Nullable
public abstract E onGetHost()

Return the object that's currently hosting the fragment.

onFindViewById

@Nullable
public View onFindViewById(int id)

onHasView

public boolean onHasView()