How to migrate to Activity lifecycle from an older API?

Migrating to the Activity lifecycle from an older API can help enhance your app's performance, stability, and compatibility with the latest Android features. The Android Activity lifecycle provides a structured way of managing the app's various states during its runtime, offering hooks to save and retrieve data and manage UI elements efficiently.

Understanding the Activity Lifecycle

The Activity lifecycle is governed by a series of callback methods that allow you to execute code at different points in the activity's existence. Key methods include:

• onCreate() - Called when the activity is first created.
• 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 another activity.
• onStop() - Called when the activity is no longer visible to the user.
• onDestroy() - Called before the activity is destroyed.

Migration Steps

To migrate to the Activity lifecycle, you should follow these steps:

1. Identify areas of your codebase that make use of the older API.
2. Replace methods or callbacks that rely on the old API with corresponding Activity lifecycle methods.
3. Test your app thoroughly to ensure compatibility and correct functionality.

Example of Using Activity Lifecycle

public class MainActivity extends AppCompatActivity {
            @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);
            }

            @Override
            protected void onStart() {
                super.onStart();
            }

            @Override
            protected void onResume() {
                super.onResume();
            }

            @Override
            protected void onPause() {
                super.onPause();
            }

            @Override
            protected void onStop() {
                super.onStop();
            }

            @Override
            protected void onDestroy() {
                super.onDestroy();
            }
        }