[Solved] Oncreate function is called once then why can the button work again and again?

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bt.setOnClickListener will register your click-listener (new View.OnClickListener() {..} on the button and thus, whenever the button is clicked, the onClick() method of your click-listener is executed.

The Android docs have a more detailed explanation

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solved Oncreate function is called once then why can the button work again and again?