Android Activity Lifecycle States of an android app throughout its by Caner Gures

You can see that when the screen orientation change started, the app destroyed portrait activity, then created and resumed the new landscape activity. Since in MainActivity.kt you don’t have any logic for saving and restoring the counter state, it was lost during this process. There are situations where the system will kill a process hence not calling onDestroy() or any other activity lifecycle methods.

What is the life cycle of Android development

Defining Actors and Use Cases might be helpful when creating the functionality of an app. Stabilization — Once development has progressed far enough, QA generally begins testing the program and fixing issues. Frequently, an application will enter a restricted beta phase in which a larger user population is given the opportunity to try it out and provide feedback and suggestions for improvements. After a while, you will see onStop and onDestroy methods are invoked.


As the activity has been re-created, the seconds and running variables are set to their default values. The layout defines three buttons that we’ll use to control the stopwatch. Each button uses its onClick attribute to specify which method in the activity should run when the button is clicked.

Needless to say, let all your creativity kick in at this stage. In case if user press the home button and app moves to background. User is not using it no more and it’s being shown in recent apps list. So in this case if system required resources need to use somewhere else then OS can destroy the Activity. So activity’s onRestart() function gets called when user comes on screen or resume the activity which was stopped. In other words, when Operating System starts the activity for the first time onRestart() never gets called.

Android Activity Life Cycle

As visible from the code above the usability of all seven activity life cycle method. Run the code above in Android Studio and you can view the Logs inside the methods called in the LogCat. In the figure above, you can see that fragment lifecycle is similar to the activity lifecycle but contains some additional fragment-specific methods.

  • The back end is what bridges the User Interface to the system, thus enabling the app to function properly.
  • This app then promotes their business without taking too much of their time and attention.
  • We’ll show you the full code for the activity on the next page.
  • It’s our responsibility as developers to make sure that we handle each of these lifecycle changes gracefully.

Fragments have a similar back stack, but the entire stack is contained within the activity. This is controlled by a class known as FragmentManager, which we’ll review next. In Android, you can navigate to and from between different activities. They are arranged in a stack with the latest activity on top of the stack trace, called the back stack. All right, the app has been conceptualized, prototyped, built, and tested.

Most important stages/phases of mobile app development life cycle

Every company should be aiming to minimize the number of errors or breaks as much as possible before app launch. An app that isn’t adequately tested prior to launch risks failure right out of the gate. Early app reviews are incredibly important due to the low sample size, and enough mediocre or poor ratings can doom an app before it ever really gets off the ground. In this stage, your developers want to make sure that everything in the app actually works. The development side of design tends to be more consulting-oriented, but one or more members of the dev team should always be involved in the design stage. They need to give input about what your business should realistically expect from the app’s functions.

What is the life cycle of Android development

While most UX mockups are black and white, the UI Design phase is where colors, graphics, and other elements are added and finished. It is critical to devote attention to decent UI design, and most popular applications have a professional appearance. Because of the widespread use of mobile devices and the high degree of engagement they generate, practically everyone has an idea for a mobile app. Mobile devices provide a completely new method of interacting with computers, the internet, and even business infrastructure.

Handlers allow you to schedule code

The runTimer() method will run code every second to check whether the stopwatch is running, increment the number of seconds and display the number of seconds in the text view. Before an Activity terminates, the corresponding lifecycle methods will be called. An activity in Android is basically every screen in which users can interact with and perform actions. Most of the time, an app will contain multiple screens that users can use to navigate an app as they listen to music, play games, watch videos, check out pics, etc. In the projectLifecycle Methodswe shall explore in considerable hands-on technical detail how the lifecycle methods operate in the Android multitasking environment.

What is the life cycle of Android development

By no means is this list exhaustive, but these questions can help guide the planning process for your app. Don’t build the app just for the sake of having an app, because it’s far better to have not built at all than to build something subpar that your target audience won’t enjoy. This callback is called when the activity becomes visible to the user. ViewModel objects are scoped to the Lifecycle passed to the ViewModelProvider when getting ViewModel.

Navigation Between Activities

When you override an activity lifecycle method, you need to call the superclass method. Here’s an overview of the activity lifecycle from birth to death. As you’ll see later in the chapter, we’ve left out some of the details, but at this point we’re just focusing on the onCreate() and onDestroy() methods. Sometimes, your users will themselves exit an activity intentionally by pressing the back button.

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User starts the activity, starts using it, then switches to another app. Your job is to play like you’re the activity and say which code will run in each of the situations below. Be called at the correct time, and this means that your app can also make sure it begins in the right shape. Similarly, the onPause() method gets called when the activity is no longer in the foreground. If the activity is never in the foreground, this method won’t get called.

Android’s Room definitely much easier than vanilla SQLite, LoaderManager, and Cursor

This is why most companies usually want to hire experts who can build them an app suited for their specific needs. At iTrobes, we pride ourselves in providing top-notch services to both, ios app development companies as well as android app development companies. With years of experience in building apps for different industries and sectors, our experts have a history of successfully launching & maintaining apps for all kinds and sizes of businesses. We let companies focus on their core business, and take complete care of building & maintaining their app from scratch for them. This app then promotes their business without taking too much of their time and attention. If your business is at a stage where an app is what it needs to accelerate further, don’t wait on it.

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