Is the main thread the same as the UI thread- Is main thread the same as UI thread?

problem ：

The Android doc says "Like activities and the other components, services run in the main thread of the application process."Android Document theory “ Like activities and other components , The service runs in the main thread of the application process .”

Is the main thread here the same thing as UI thread? Whether the main thread is connected with UI The threads are the same ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/DgQk