How does Activity lifecycle work internally in Android SDK?

The Activity lifecycle in Android is a critical aspect that defines how an app interacts with the user and manages UI and resources. It consists of various states from creation to destruction.

When an Activity starts, it transitions through a series of methods which are core to its lifecycle. The main methods include:

• onCreate(): Called when the activity is first created. This is where you initialize your activity.
• onStart(): Called when the activity becomes visible to the user.
• onResume(): Called when the activity starts interacting with the user.
• onPause(): Called when the system is about to start resuming a previous activity. This is where you commit unsaved changes.
• onStop(): Called when the activity is no longer visible to the user.
• onDestroy(): Called before the activity is destroyed. This is usually where you clean up resources.

The Android system calls these methods at different stages to manage the application efficiently.