mobdevMidt

it represents a single screen in the app where the user can perform a single focused task such as sending an e-mail.

• Intent

• Activity life cycle

• Activity

• Main Activity

It is presented to the user when the app is launched. It can then start other activities to perform different actions.

• Main Activity

• Intent extras

• Activity

• Target Activity

It is the set of states an activity can be in during its entire lifetime.

• Activity cycle

• Layout

• Activity life cycle

• Target Activity

It is invoked when the app is launched for the first time. It happens only once for the entire life of the activity.

• onResume()

• onDestroy()

• onStart()

• onCreate()

It is invoked before the activity becomes visible to the user.

• onResume()

• onDestroy()

• onStart()

• onCreate()

If the activity comes to the foreground

• onResume()

• onDestroy()

• onStart()

• onCreate()

If the activity becomes hidden

• onResume()

• onDestroy()

• onStart()

• onStop()

It is invoked before the activity starts interacting with the user.

• onResume()

• onDestroy()

• onStart()

• onStop()

It is invoked when the system is about to start resuming another activity.

• onPause()

• onDestroy()

• onStart()

• onStop()

If the activity is coming back to interact with the user

• onPause()

• onDestroy()

• onStart()

• onRestart()