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I have read documents about Thread on Android, but I could not find differences between UI thread and Worker Thread. Can someone just give me more example about it?
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In Android the main thread and the UI thread are one and the same. You can use them interchangeably. In Android each app gets a dedicated process to run. Thus the process will be having a main thread.
User Interface Thread or UI-Thread in Android is a Thread element responsible for updating the layout elements of the application implicitly or explicitly. This means, to update an element or change its attributes in the application layout ie the front-end of the application, one can make use of the UI-Thread.
There're 3 types of thread: Main thread, UI thread and Worker thread. Main thread: when an application is launched, the system creates a thread of execution for the application, called main.
Worker thread is a continuous parallel thread that runs and accepts messages until the time it is explicitly closed or terminated. Messages to a worker thread can be sent from the parent thread or its child worker threads. Through out this document, parent thread is referred as thread where a worker thread is spawned.
The Ui thread is the thread that makes any changes required for the ui.
A worker thread is just another thread where you can do processing that you dont want to interupt any changes happening on the ui thread
If you are doing large amounts of processing on the ui thread while a change to the ui is happening the ui will freeze until what ever you have running complete.
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