Android Activity Life Cycle.

The activity lifecycle in Android refers to the series of stages that an activity goes through from when it is first created until it is destroyed. Each stage in the lifecycle is represented by a method that the system calls when an activity transitions from one stage to another. The following are the lifecycle methods of an Android activity:

  1. onCreate() - This method is called when the activity is first created. It is used for initializing the activity components.

  2. onStart() - This method is called when the activity is visible to the user, but not yet in the foreground.

  3. onResume() - This method is called when the activity is in the foreground and the user can interact with it.

  4. onPause() - This method is called when the activity is partially visible to the user, but not in the foreground. It is used for releasing resources that may be used by the activity.

  5. onStop() - This method is called when the activity is no longer visible to the user.

  6. onDestroy() - This method is called when the activity is being destroyed.

Here's an example of how the activity lifecycle works:

Suppose you launch an app, and it opens up the MainActivity. The following are the steps that take place during the activity lifecycle:

  1. The onCreate() method is called, and the activity is initialized.

  2. The onStart() method is called, and the activity becomes visible to the user.

  3. The onResume() method is called, and the activity is in the foreground, and the user can interact with it.

  4. If the user navigates to another activity or closes the app, the onPause() method is called, and the activity is partially visible.

  5. If the activity is no longer visible, the onStop() method is called.

  6. Finally, if the activity is being destroyed, the onDestroy() method is called.

It is important to understand the activity lifecycle in Android as it helps in managing the app's resources efficiently. By implementing the lifecycle methods, you can release the resources that are no longer required, thereby improving the app's performance.

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