The document describes the concept of fragments in Android, detailing their role as sub-activities within activities and their lifecycle methods. Fragments can be dynamically added, removed, or replaced based on the device's screen size, impacting their usability in applications. The lifecycle methods of fragments, such as onattach(), oncreate(), and onresume(), dictate their behavior during various stages of interaction and visibility.

1. FRAGMENTS AND MULTIPLATFORM
SUPPORT

2. FRAGMENTS
• Android Fragment is the part of activity, it is also known as
sub-activity.
• There can be more than one fragment in an activity.
Fragments represent multiple screen inside one activity.
• Android fragment lifecycle is affected by activity lifecycle
because fragments are included in activity.

3. FRAGMENTS
• Each fragment has its own life cycle methods that is affected
by activity life cycle because fragments are embedded in
activity.
• Fragments in Android can be added, removed, or replaced
dynamically i.e., while the activity is running.

5. FRAGMENTS
• The usage of Fragment in an android app totally depends on
the screen size of the device on which the app is being used.
• If the screen size is big, then we can easily show 2 or maybe
more fragments on the screen, but if the display size is smaller, it
is advised to use Fragments in separate activities.

6. Lifecycle methods of Fragment

7. Lifecycle methods
• onAttach(): attaches the fragment onto the host activity.
• onCreate() : here fragment got created.
• onCreateView(): here fragment views got created.
• onActivityCreated(): is a lifecycle method in the Android Fragment
lifecycle that is called when the Fragment's activity has been fully
created and its view hierarchy is completely instantiated.

8. Lifecycle methods
• onStart(): it invokes when fragment got visible.
• onResume(): this method invokes when fragment start
interacting.
• onPause(): this method invokes when fragment stop
interacting.
• onStop() : this method invokes when fragment no more
visible.
• onDestroyView(): this method destroys the view of it.
• onDestroy(): this method invokes to destroy fragment.