This does not necessarily mean that onSaveInstanceState() will be called at this stage, as the activity may simply be paused rather than destroyed. When does an activity become non-interactive? Does this mean that onSaveInstanceState() should be called at this stage?Īn activity becomes non-interactive when it is no longer in the foreground, typically because another activity has been launched in front of it. However, if you are looking to create a more complex app with multiple screens, then you will need to use Fragments to build up the user interface. If you are looking to create a simple app with a single screen, then an Activity is probably all you need. They are essentially self-contained modules that can be used to build up a more complex user interface. Fragments are a more recent addition to Android, and they are designed to be used within an Activity. What’s the difference between Activities and Fragments? Which one would you recommend using in certain situations?Īctivities are a core component of Android applications, and they are responsible for managing the lifecycle of an app. This will prevent the new activity from being added to the backstack, and as a result, the user will not be able to return to it. You can do this by using the FLAG_ACTIVITY_NO_HISTORY flag when starting the new activity. Yes, it is possible to start a new activity without creating a backstack. Is it possible to start a new activity without creating a backstack? If yes, then how? When you start another activity while your current activity is paused, the new activity will be started and the current activity will be pushed to the background. What happens when you start another activity while your current activity is paused? You need to call onPause() when your activity is no longer visible to the user, onResume() when your activity becomes visible to the user again and onStop() when your activity is no longer visible to the user and is being destroyed. When do you need to call onPause(), onResume() and onStop()? Some common scenarios for stopping an existing activity include when the user presses the back button, when the user finishes a task, or when the user navigates to a new activity. Some common scenarios for starting a new activity include when the user presses a button or link, when the user selects an item from a list, or when the user starts a new task. What are some common scenarios for starting a new activity or stopping and existing one? This can happen when the user switches to another app, or if the system needs to free up resources for another app. When an app is no longer the focus of the user’s attention, but is still running in the background, it is considered to be in the “paused” state. When does your app go from being “inactive” to being “paused”? You can easily remember these stages by thinking of them as the four C’s: Create, Start, Resume, and Pause. There are four main stages in the activity lifecycle: onCreate(), onStart(), onResume(), and onPause(). How can you easily remember the various stages of the activity lifecycle? The destroyed stage is when the activity is no longer visible to the user and is being removed from memory. The resumed stage is when the activity is in the foreground and the user can interact with it. The started stage is when the activity becomes visible to the user. The created stage is when the activity is first created and initialized. There are four different stages in the activity life cycle on Android: created, started, resumed, and destroyed. Can you explain the different stages of the activity life cycle on Android? While activities are often presented to the user as full-screen windows, they can also be used in other ways: as floating windows (via a theme with windowIsFloating set) or embedded inside of another activity (using ActivityGroup). Almost all activities interact with the user, so the Activity class takes care of creating a window for you in which you can place your UI with setContentView(View). What is an Activity in Android?Īn activity is a single, focused thing that the user can do. Here are 20 commonly asked Android Activity Lifecycle interview questions and answers to prepare you for your interview: 1. Android Activity Lifecycle Interview Questions and Answers By understanding the most common questions and how to answer them, you can improve your chances of impressing the hiring manager and landing the job. In this article, we’ll review some common interview questions about the Android Activity Lifecycle. Understanding how the cycle works is important for any Android developer, as it can help you manage your app’s resources and ensure a smooth user experience. The cycle is made up of a series of callback methods that are invoked by the Android system when an activity changes state. The Android Activity Lifecycle is a set of rules that govern how an Android app behaves when a user interacts with it.
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