Understand
An Android activity goes through six major lifecycle stages or callbacks. These are: onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy(). The system invokes each of these callbacks as an activity enters a new state.
Note that it’s not necessary to implement all these lifecycle callbacks in your Android application. As a developer, you should know when to implement each of these callbacks depending on the activity’s complexity.
Let’s discuss this activity’s lifecycle and implement them in an actual Android application.
onCreate()
The onCreate() callback is compulsory in all Android applications. It is the first method called when we launch an activity from the home screen or intent. In other words, it is a default callback that is automatically created when you create a new activity.
onStart()
When an application is started, the system will invoke an onStart() method. This callback is invoked to make the activity visible to the user.
onResume()
Once onStart() is called, onResume() is immediately invoked. Every component associated with this activity is brought to the foreground state. The activity is now considered interactive.
onPause()
onPause() is called when the user switches to another activity or a multi-window mode application. At this point, the activity has lost focus and is running in the background.
onStop()
At this point, most of the activity processes have been stopped. However, the activity is still running in the background.
onRestart()
Since the activity’s states still exist, the onRestart() method can be called when the user restarts the activity. This means the activity will go back to the main screen and the user can resume interacting with its components.
onDestroy()
This is the final callback that the activity will receive when it is stopped.
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