A fragment represents a conduct or a
part of user interface in an activity. You can integrate more than one fragment
in a single activity to build a multi-pane UI
and reuse a fraction in multiple activities. you may consider a fragment as a
modular phase of an activity, which has its personal lifecycle, receives its
very own enter events, and which you may upload or dispose of even as the
interest is walking (kind of like a "sub interest" that you may reuse
in exclusive sports).
Following are crucial points about
fragment −
- A fragment has its very own layout and its own behaviour with its
personal life cycle callbacks.
- You may add or do away with fragments in an interest whilst the
interest is strolling.
- You may integrate multiple fragments in an unmarried hobby to
construct a multi-plane UI.
A fraction can be utilized in
multiple activities.
- Fragment life cycle is closely associated with the life cycle of
its host interest which means when the pastime is paused, all the fragments
available in the hobby will also be stopped.
- A fraction can put into effect a behaviour that has no person
interface aspect.
- Fragments were added to the Android API in Honeycomb model of
Android which API version eleven.
- You create fragments via extending Fragment elegance and you can
insert a fraction into your hobby layout by way of affirming the fragment
inside the hobby's format document, as a <fragment> detail.
- Prior to fragment introduction, we had a difficulty because we
will display only a single hobby on the display screen at one given factor
in time. So we had been not capable of divide device display and control
extraordinary components one by one. However with the introduction of
fragment we got greater flexibility and removed the difficulty of having a
single activity on the display screen at a time. Now we will have a single
pastime however every interest can incorporate of more than one fragments
in order to have their own format, occasions and entire life cycle.
Right here is the listing of
techniques which you can to override for your fragment magnificence −
1 A fraction can be utilized in
multiple activities.
- Fragment life cycle is closely associated with the life cycle of
its host interest which means when the pastime is paused, all the fragments
available in the hobby will also be stopped.
- A fraction can put into effect a behaviour that has no person
interface aspect.
- Fragments were added to the Android API in Honeycomb model of
Android which API version eleven.
- You create fragments via extending Fragment elegance and you can
insert a fraction into your hobby layout by way of affirming the fragment
inside the hobby's format document, as a <fragment> detail.
- Prior to fragment introduction, we had a difficulty because we
will display only a single hobby on the display screen at one given factor
in time. So we had been not capable of divide device display and control
extraordinary components one by one. However with the introduction of
fragment we got greater flexibility and removed the difficulty of having a
single activity on the display screen at a time. Now we will have a single
pastime however every interest can incorporate of more than one fragments
in order to have their own format, occasions and entire life cycle.
Right here is the listing of
techniques which you can to override for your fragment magnificence −
1)
onAttach():The fragment example is related to an
interest example. The fragment and the hobby aren’t always fully initialized. Generally
you get on this approach a connection with the interest which makes use of the
fragment for similarly initialization paintings.
2)
onCreate(): The device calls this technique when
developing the fragment. You have to initialize critical components of the
fragment which you need to keep when the fragment is paused or stopped, then
resumed.
3)
onCreateView(): The system calls this callback while it is
time for the fragment to attract its person interface for the primary time. to
draw a UI on your fragment, you need to go back a View issue from this
technique that is the foundation of your fragment's format. you may return null
if the fragment does no longer provide a UI.
4)
onActivityCreated():
The onActivityCreated() is
referred to as after the onCreateView() method whilst the host hobby is
created. Activity and fragment example have been created in addition to the
view hierarchy of the activity. At this point, view may be accessed with the
findViewById() method. Example. on this approach you may instantiate objects
which require a Context object
5)
onStart(): The onStart() technique is known as once
the fragment gets visible.
6)
onResume(): Fragment turns into lively.
7)
onPause(): The device calls this technique because
the first indication that the person is leaving the fragment. this is generally
where you need to dedicate any modifications that must be endured beyond the
modern-day person session.
8)
onStop(): Fragment going to be stopped by using
calling onStop()
9)
onDestroyView():Fragment view will smash after call this
technique
10)
onDestroy(): onDestroy() known as to do very last
smooth up of the fragment's state however no longer assured to be referred to
as by using the Android platform.
How to
use Fragments?
·
This involves wide variety of simple steps to create
Fragments.
·
To begin with determine what number of fragments you need to
apply in an activity. as an instance permit's we need to apply fragments to address landscape and portrait
modes of the device.
·
Next based totally on number of fragments, create
instructions to be able to amplify the Fragment class. The Fragment class has
above noted callback capabilities. you could override any of the functions
based totally to your requirements.
·
Corresponding to each fragment, you'll need to create layout
files in XML record. Those files may have format for the defined fragments.
·
Eventually adjust activity document to outline the actual
good judgment of changing fragments based totally to your requirement.
Forms of
Fragments
·
Basically fragments are divided as three ranges as proven
underneath.
·
Single body fragments− single frame fragments
are using for hand keep devices like mobiles, right here we can show best one
fragment as a view.
·
List fragments − fragments having
special listing view is called as list fragment
·
Fragments transaction− The usage of with
fragment transaction. We are able to flow one fragment to any other fragment.
