When is the onCreate() Method Called in Android Activity? - Programming Question

Understanding the Android Activity Lifecycle

As an Android developer, it's important to have a good understanding of the Android activity lifecycle. The activity lifecycle is a series of events that occur as an app interacts with the user and the system, such as when the app is launched, paused, resumed, or destroyed. One of the most important methods in the activity lifecycle is the onCreate() method.

When is the onCreate() Method Called?

The onCreate() method is called when an activity is first created. It's typically used to perform one-time setup for the activity, such as creating views, initializing variables, or binding data to a list. The method is called only once during the lifecycle of an activity, unless the activity is destroyed and recreated due to a configuration change, such as a screen rotation.

Example Code

Here's an example of how the onCreate() method might be implemented in an Android activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Perform one-time setup
    initView();
    initData();
}

In this example, the onCreate() method is used to set the content view for the activity, and to perform one-time setup by calling the initView() and initData() methods.

Conclusion

In summary, the onCreate() method is an important part of the Android activity lifecycle, and is called when an activity is first created. It's typically used to perform one-time setup for the activity, such as creating views, initializing variables, or binding data to a list. By understanding the activity lifecycle and the onCreate() method, you can create more robust and efficient Android apps.