Android Lifecycle
Understanding the Android Activity Lifecycle
Android Lifecycle
The Android lifecycle refers to the series of states that an Android activity can go through during its existence, which is managed by the Android operating system. It primarily consists of seven core methods that developers can override to handle state changes: `onCreate()` initializes the activity, `onStart()` makes it visible, `onResume()` brings it to the foreground for user interaction, `onPause()` is called when the activity is partially obscured, `onStop()` occurs when it is no longer visible, `onDestroy()` cleans up resources before it is destroyed, and `onRestart()` is triggered when an activity moving out of the stopped state is preparing to move back to the started state. Understanding this lifecycle is crucial for managing resources effectively, ensuring a smooth user experience, and handling various scenarios like configuration changes, activity transitions, and system resource constraints.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - Activity Creation (`onCreate()`): This is the first callback method. It is called when the activity is being created. Initialization of the activity's UI and binding data to lists happen here.
2) Activity Start (`onStart()`): This method is called when the activity becomes visible to the user. At this point, the activity is not yet interactive.
3) Activity Resume (`onResume()`): This method is called when the activity becomes the foreground activity and is ready for user input. The activity is in an active state.
4) Activity Pause (`onPause()`): This is called when the system is about to start resuming another activity. This is typically where you save data and stop animations or other ongoing actions that may consume CPU resources.
5) Activity Stop (`onStop()`): This method is called when the activity is no longer visible to the user. This could happen because the activity is being destroyed, or a new activity has been started.
6) Activity Restart (`onRestart()`): This method is called when the activity comes back to the foreground after being stopped. It is a good place to refresh UI components.
7) Activity Destruction (`onDestroy()`): This is called before the activity is destroyed. It is a good place to release resources, save persistent state, and clean up.
8) State Saving (`onSaveInstanceState()`): This method is called before an activity may be killed to save UI state information, allowing it to be restored when the activity is recreated.
9) Configuration Changes Handling: Activities can be recreated when a configuration change occurs (like screen rotations). This invokes the whole lifecycle process again, starting with `onCreate()`.
10) Foreground vs Background: Understanding when an activity enters the foreground and background is vital for managing resources, transitions, and user experience.
11) Multiple Activities: Having multiple activities in an app means understanding how they interact and how the lifecycle is managed as users navigate between them.
12) Fragments Lifecycle: Similar to activities, fragments also have their lifecycle methods and lifecycle can be affected by the parent activity's lifecycle.
13) Memory Management: During the lifecycle methods, it’s critical to manage memory and resources appropriately, especially in `onPause()`, `onStop()`, and `onDestroy()`.
14) Lifecycle Callbacks: There are specific lifecycle callbacks to observe and manage changes, such as `onUserLeaveHint()`, which is called when the user is leaving the activity.
15) Lifecycle Aware Components: With Android Jetpack, using LiveData and ViewModel allows for handling the lifecycle in a more efficient way, decoupling UI related data from activity lifecycle.
16) Testing Lifecycle Effects: Understanding the lifecycle is essential for testing applications since you need to know how state changes affect the UI and app behavior.
17) Best Practices: It is important to follow best practices for lifecycle management, such as performing heavy operations in a background thread and not in the main UI thread to maintain a responsive interface.
18) Notifications & BroadcastReceivers: Being aware of how lifecycle methods affect other application's components like notifications and BroadcastReceivers is essential for building robust Android applications.
Through these points, students can gain a comprehensive understanding of the Android activity lifecycle, its significance in app development, and best practices for managing activities efficiently.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
Contact Us for more info:
- Message us on Whatsapp: +91 9987184296
- Email id: info@justacademy.co
best software testing institutes in chennai
Software Testing Course In Trichy
