A brief about fragments.

1. Fragment
SOURCE GOOGLE : A SMALL PART BROKEN OFF OR SEPARATED FROM
SOMETHING.

2. WTF
what the fragment
 Fragment is independent portion or chunk of a user interface in the
screen.
 It was introduced in honeycomb to solve tablet design problems.
 Has it’s own lifecycle methods.
 Has backstacking functionalities.
 Supports Multipane screen.

3. How different it from activity
 Depends upon activities lifecycle.
 Without hostactivity it fragment can not run.
 You can add and remove fragments from running activity.

4. Fragment
Life Cycle

5. • OnAttach(): Called when the fragment has been associated with the activity (the Activity is passed in
here).
• onCreateView():Called to create the view hierarchy associated with the fragment.
• onActivityCreated():Called when the activity's onCreate() method has returned.
• onDestroyView():Called when the view hierarchy associated with the fragment is being removed.
• onDetach():Called when the fragment is being disassociated from the activity.

6. How many
ways to
create F ?
From xml using
<fragment />
01
Dynamically from
Activity with UI.
Returning view to the
activity.
02
Dynamically from
Activity without UI.
Returning view to the
activity.
03

7. public static class ExampleFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.example_fragment, container, false);
}
}

8. onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
1. Inflater : object to inflate the resource(xml)
2. Container : parent Viewgroup won which the fragment to be
attached.
3. savedInstanceState :bundle object to save the state of your
fragment .

9. BlankFragment mFg = new BlankFragment();
FragmentManager mManager = getSupportFragmentManager();
FragmentTransaction mTransc = mManager.beginTransaction();
mTransc.add(R.id.id_fragment_container, mFg, "BLANK");
mTransc.addToBackStack("TAG");
mTransc.commit();

10. How to
remove a F?
findFragmentById(int id)
01
findFragmentByTag(String
tag)
02

11. What else ?
 add() :Add a fragment to the activity.
 remove(): Remove a fragment from the activity. This operation destroys the
fragment instance unless the transaction is added to the transaction back stack,
described later.
 replace() :Remove one fragment from the UI and replace it with another.
 hide() : Hide a fragment in the UI (set its visibility to hidden without destroying
the view hierarchy).
 show() :Show a previously hidden fragment.
 detach() (API 13): Detach a fragment from the UI, destroying its view hierarchy
but retaining the fragment instance.
 attach() (API 13): Reattach a fragment that has previously been detached from
the UI, re-creating its view hierarchy.

12. How to communicate with other
components.
 Bundle you can pass the data.
 Interfaces you can update / communicate new data.