Introduction: In Android development, understanding the Activity lifecycle is crucial for building robust and responsive applications. Activities are the building blocks of Android applications, representing individual screens or user interfaces. In this blog post, we’ll delve into the Android Activity lifecycle, exploring each stage and its significance.

1. onCreate():
   
   The onCreate() method is the first callback invoked when the activity is created. It’s where you initialize essential components such as UI elements and variables.
   
   Use Cases:
   
   • Initializing UI components.
   • Setting up variables and data structures.
   • Performing one-time setup tasks.
   Example:

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       // Initialize components and variables here
   }
   

   
   Note: When the activity is destroyed and recreated due to a configuration change, such as screen rotation.
2. onStart():
   onStart() is called when the activity becomes visible to the user but is not yet interactive. This is a good place to perform tasks that need to happen every time the activity is made visible.
   
   Use Cases:
   • Starting animations or transitions.
   • Acquiring resources needed for the activity’s operation.
   Example:

   @Override
   protected void onStart() {
       super.onStart();
       // Perform tasks when activity starts
   }
   

   
   Note: onStart() is called every time the activity becomes visible, including after a screen rotation or when returning from another activity.
3. onResume():
   onResume() is called when the activity is about to start interacting with the user. This is where you should resume tasks that were paused or stopped in onStart().
   
   Use Cases:
   • Resuming tasks that were paused, such as animations or location updates.
   • Registering broadcast receivers or listeners.
   Example:

   @Override
   protected void onResume() {
       super.onResume();
       // Resume tasks when activity is resumed
   }
   

   
   Note: onResume() is called every time the activity becomes visible, including after a screen rotation or when returning from another activity.
4. onPause():
   onPause() is called when the activity is about to lose focus. Use this method to save data or perform any other tasks that need to be done before the activity is paused.
   
   Use Cases:
   • Saving user data or application state.
   • Stopping animations or ongoing processes.
   Example:

   @Override
   protected void onPause() {
       super.onPause();
       // Save data or perform tasks before pausing
   }
   

   
   Note: onPause() is called when the activity goes into the background, such as when another activity is launched or when the device goes to sleep.
5. onStop():
   onStop() is called when the activity is no longer visible to the user. This is a good place to save data and perform cleanup tasks.
   
   Use Cases:
   • Saving persistent data to a database or file.
   • Releasing resources not needed when the activity is not visible.
   Example:

   @Override
   protected void onStop() {
       super.onStop();
       // Save data and perform cleanup tasks when activity is stopped
   }
   

   
   Note: onStop() is called when the activity is no longer visible, such as when another activity is launched or when the user navigates away from the app.
6. onRestart():
   onRestart() is called when the activity is being restarted after it has been stopped. This method is invoked before onStart() when the activity is being reinitialized from a stopped state.
   
   Use Cases:
   • Performing initialization tasks that need to be executed when the activity is being restarted.
   • Restoring the state of the activity to its previous state before it was stopped.
   Example:

   @Override
   protected void onRestart() {
       super.onRestart();
       // Perform initialization tasks and restore state when activity is restarted
   }
   

   
   Note: onRestart() is called after the activity has been stopped and before it becomes visible to the user again. It is a good place to perform tasks related to reinitialization and state restoration.
7. onDestroy():
   onDestroy() is called before the activity is destroyed. Use this method to release resources or perform final cleanup tasks.
   
   Use Cases:
   • Releasing resources like database connections or network connections.
   • Unregistering broadcast receivers or listeners
   Example:

   @Override
   protected void onDestroy() {
       super.onDestroy();
       // Release resources and perform cleanup tasks before destruction
   }
   

   
   Note: onDestroy() is called when the activity is being destroyed, either by the system or by calling finish() explicitly. It’s typically not called during a configuration change.