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UI thread and backgound thread..

UI thread in Android

  • When an app icon is clicked to launch it, system starts a new process and runs the main activity on a new thread if the app is not already started. All the subsequent user interactions with the app and components handle the interactions run on the the same thread. This thread is called main thread.
  • If an app is already running on a thread and a component is requested, the component will run on the existing thread for the app.
  • Background or worker thread can be created within the app to run long running tasks.
  • Main thread is also called UI thread as all UI components run on the main thread. But in system apps, UI thread can be different from main thread if views run on different threads.

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