Android Activity

Activity Lifecycle

• https://developer.android.com/guide/components/activities/activity-lifecycle

Callbacks

• onCreate() - First creation.
• onStart() - Visible to user.
• onResume() - Start of user interaction.
• onPause() - No user input, no code execution, previous Activity being resumed.
• onStop() - Not visible to user.
• onDestroy() - Destroyed by system.
• onRestart() - Restart after stop.

Initial start

• onCreate()
• onstart()
• onResume()

Screen button Lock

• onPause()
• onStop()

Screen button Unlock

• onStart()
• onResume()

Back button

• onPause()
• onStop()
• onDestroy()

See Also

• https://www.tutorialspoint.com/android/android_acitivities.htm