Question: Which of the following is the first callback method that is invoked by the system during an activity life-cycle?
A onStart() method
B onClick() method
C onRestart() method
D onCreate() method
Answer: onCreate() method
| Method | Description |
| onCreate() | · The onCreate() method is the first callback method that is invoked by the system during the creation of an activity.
· It is used for performing one-time initialization, such as setting up the user interface and binding data. |
| onStart() | · The onStart() method is part of the Android activity lifecycle.
· It is often used for initialization and preparing the UI. |
| onClick() | · The onClick() method is not a standard Android activity lifecycle method.
· It is a method used for handling user interactions, such as button clicks. · It’s typically associated with event handling for UI components like buttons. |
| onRestart() | · The onRestart() method is called when an activity is restarted after being stopped but not destroyed.
· It’s part of the activity lifecycle and is used for reinitializing resources that were released during the onStop() method. |
| onDestroy() | · The onDestroy() method is called before the activity is destroyed by the system.
· It’s the last method in the activity lifecycle · It is used for final cleanup, such as releasing resources and unregistering listeners or receivers. |