Android Interview Question Answer : Fragment and Activity Explained

Continue your Android interview preparation with Part 4 of our series! Covering advanced concepts, best practices, and real-world Android development interview questions. Read Part 3 here link on Retrofit

Fragment and Activity

What is a Fragment? How does it differ from an Activity?

• A Fragment is a reusable UI component that can be embedded in an Activity. while activity is an independent component that can not be loaded in another activity.

What is the lifecycle events/method’s of an Activity in sequence?

• Method/Event in sequence
• onCreate(), onStart(), onResume(), onPause(), onStop(), onDestroy().
• while closing activity what event called: The onPause(), onStop(), and onDestroy() methods are called in that order while closing activity.

What is the lifecycle events/method of a Fragment in sequance ?

onAttach(), onCreate(), onCreateView(), onViewCreated(), onStart(), onResume(), onPause(), onStop(), onDestroyView(), onDestroy(), onDetaWch().

In what scenario does the onDestroy get called directly after onCreate?

When you write the finish() method in onCreate() then it only gets called

What is the difference between onCreate() and onStart() in an Activity?

• The onCreate() method is Called when the Activity is created. Used to initialize resources like views, variables, etc.
• The onStart() method is Called when the Activity becomes visible but not yet interactive.

How do you pass data between a Fragment and an Activity?

To pass data between activity and fragment we can use ViewModel.

How do you pass data from Fragment to an Activity without ViewModel?

We can use an interface to share data between activities and fragments. To do that we can define an interface and implement that in the activity and we can pass that implementation to the fragment to get a callback when we need to pass data from fragment to activity.

public class MainActivity extends AppCompatActivity implements MyFragment.OnDataPass {
    @Override
    public void onDataPass(String data) {
        // Handle the data passed from Fragment
    }
}