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Recomposition is when Jetpack Compose re-executes the composables that may have changed in response to state changes, and then updates the Composition to reflect any changes. A Composition can only be produced by an initial composition and updated by recomposition.

Also, some code can be compiled for all targets (common Kotlin), and some is platform-specific. Compose UI is a library for writing UI's. The vast majority of effort and the only really "production ready" implementation is for Android. However, compose for Desktop running on the JVM is being used by many teams.

To create a new project that has Compose setup correctly, proceed as follows: If you're in the Welcome to Android Studio window, click Start a new Android Studio project. ... In the Select a Project Template window, select Empty Compose Activity and click Next. In the Configure your project window, do the following:

Composable functions can recompose, so they are not like standard functions, in the sense that they will not be called only once as part of a call stack. This is how a normal call stack would look. Each function gets called once, and it can call one or multiple other functions.

Compose allows you to do more with less code, compared to using the Android View system: Buttons, lists or animation - whatever you need to build, now there's less code to write.

Using Compose, you can build your user interface by defining a set of composable functions that take in data and emit UI elements. A simple example is a Greeting widget, which takes in a String and emits a Text widget which displays a greeting message.

Compose allows you to do more with less code, compared to using the Android View system: Buttons, lists or animation - whatever you need to build, now there's less code to write.