onCreate() only schedules log("A") to be executed later, this is added to the queue. Main thread is cooperative, it allows scheduling of tasks and coroutines just use this feature.Īlso, you asked in the comments, how is it possible that both log statements are run in parallel, but on the same thread. It doesn't mean coroutines take full control over the main thread or that they somehow, magically inject anything to it. But the user is also allowed to schedule their tasks manually, for example by using runOnUiThread() or getMainLooper().ĭispatchers.Main is just yet another way to schedule something on the main thread. For example, when you click on a button, internally onClick action is scheduled to be run on the main thread. That means it waits for tasks to be scheduled to it, it has a queue of such tasks and executes them sequentially. Run or download Kotlin Programming Compiler using our android online emulator from ApkOnline.The UI/main thread in Android (and other UI frameworks as well) runs a so called event loop. For example, if your program provides an input prompt, enter the input in the Input tab prior to compilation. This is a batch compiler interactive programs are not supported. Some file system, network and graphics functions may be limited Internet connection is required for compilation Open, save, import and share Kotlin files. Advanced source code editor with syntax highlighting, bracket completion and line numbers Kotlin is officially supported and preferred by Google for mobile development on Android.
Kotlin is sponsored by JetBrains and Google through the Kotlin Foundation. Kotlin mainly targets the JVM, but also compiles to JavaScript or native code (via LLVM). Kotlin is designed to interoperate fully with Java, and the JVM version of its standard library depends on the Java Class Library, but type inference allows its syntax to be more concise. Kotlin is a cross-platform, statically typed, general-purpose programming language with type inference.
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