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並前往https://books.google.com.tw/books?id=uIXvDwAAQBAJ&pg=PA437&lpg=PA437&dq=navhostfragment&source=bl&ots=i8401EzW2V&sig=ACfU3U27QUQJn9TsJFXC0vwLZa3ngpVHpQ&hl=zh-TW&sa=X&ved=2ahUKEwicpomqvYf0AhXu7rsIHcv6AVcQ6AF6BAgXEAM

Android Application Development All-in-One For Dummies

That's because the MainActivity doesn't have a NavHostFragment in it. To make navigation work, you must add and configure this fragment.

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