Layout files in Android are XML files, and they are kept in the layout resource folder of your project. For example MainActivity.kt.įirst, you’ll need to create a layout file for your activity. ![]() For the layout class, specify the name of the layout, followed by the type of layout, using a camel case syntax. ![]() For the layout file, specify the type of layout, followed by the name of the layout, using a snake case syntax.To correctly create and set up an Activity, you need to create a new Kotlin class, which extends the AppCompactActivity class. Without activities, there would be no user interface. ![]() Instead, the activity can be considered like the container under which all other UI components (fragments included) will be placed. The key difference, that emerges from the definitions, is that the fragment depends on an activity to exist, and so it represents only a part of the user interface. Fragments cannot live on their own-they must be hosted by an activity or another fragment. A fragment defines and manages its own layout, has its own lifecycle, and can handle its own input events. On the other hand, here is the fragment’s definition from the official documentation:Ī fragment represents a reusable portion of your app's UI. 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 a Fragment? ![]() Just by reading the definitions of the two structures, it appears that they are very different.Īccording to the Android Developer’s official documentation,Īn activity is a single, focused thing that the user can do.
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