In Android, there can be multiple activities, but there is only one MainActivity, which is the entrance of the application, just like the main() method begins the execution of a program in Java. The activity is also responsible for the creation, destruction, and control of the other states of the app’s lifecycle.Īn activity class handles many of the computation details, like creating a window for you. In Android development, an activity is a Java class that has some pre-defined functions that can be triggered in different app states to perform any kind of task you want. Creating and adding fragments to the Android applicationĪn activity refers to a single action that a user can perform.FragmentManager and fragment lifecycle state.Relationship and differences between activity state and fragment lifecycle.To follow along with this tutorial, you’ll need basic knowledge of the Kotlin programming language as well as Android Studio or IntelliJ IDE installed. Let’s get started! In this article, we’ll review what these concepts are, how they work, and what steps to follow to implement them in an Android application. In modern Android development, the activity state and fragment lifecycle play a crucial role, influencing implementation decisions as well as the final output that is viewed and experienced by end users. Activity state and fragment lifecycle in Android apps with Kotlin However, I cannot see an obvious way to remove the menu item for the selected fragment.Peter Aideloje Follow I'm a passionate developer and technical writer whose interest aligns with full-stack software engineering, specifically Java, Csharp, and other frontend stacks like HTML5, CSS3, and JavaScript. when the user clicks the menu item I replace the fragment with the relevant new fragment. I have an ActionBar activity with a FrameLayout and a menu.
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